Merge tag 'gpio-v5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "This time very little driver changes but lots of core changes.

  We have some interesting cooperative work for ARM and Intel alike,
  making the GPIO subsystem more and more suitable for industrial
  systems and the like, in addition to the in-kernel users.

  We touch driver core (device properties) and lib/* by adding one
  simple string array free function, these are authored by Andy
  Shevchenko who is a well known and recognized core helpers maintainers
  so this should be fine.

  We also see some Android GKI-related modularization in the MXC
  drivers.

  Core changes:

   - The big core change is the updated (v2) userspace character device
     API.

     This corrects badly designed 64-bit alignment around the line
     events. We also add the debounce request feature. This echoes the
     often quotes passage from Frederick Brooks "The mythical man-month"
     to always throw one away, which we have seen before in things such
     as V4L2. So we put in a new one and deprecate and obsolete the old
     one.

   - All example tools in tools/gpio/* are migrated to the new API to
     set a good example. The libgpiod userspace library has been
     augmented to use this new API pretty much from day 1.

   - Some misc API hardening by using strn* function calls has been
     added as well.

   - Use the simpler IDA interface for GPIO chip instance enumeration.

   - Add device core function for counting string arrays in device
     properties.

   - Provide a generic library function kfree_strarray() that can be
     used throughout the kernel.

  Driver enhancements:

   - The DesignWare dwapb-gpio driver has been enhanced and now uses the
     IRQ handling in the gpiolib core.

   - The mockup and aggregator drivers have seen some substantial code
     clean-up and now use more of the core kernel inftrastructure.

   - Misc cleanups using dev_err_probe().

   - The MXC drivers (Freescale/NXP) can now be built modularized, which
     makes modularized GKI Android kernels happy"

* tag 'gpio-v5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (73 commits)
  gpiolib: Update header block in gpiolib-cdev.h
  gpiolib: cdev: switch from kstrdup() to kstrndup()
  docs: gpio: add a new document to its index.rst
  gpio: pca953x: Add support for the NXP PCAL9554B/C
  tools: gpio: add debounce support to gpio-event-mon
  tools: gpio: add multi-line monitoring to gpio-event-mon
  tools: gpio: port gpio-event-mon to v2 uAPI
  tools: gpio: port gpio-hammer to v2 uAPI
  tools: gpio: rename nlines to num_lines
  tools: gpio: port gpio-watch to v2 uAPI
  tools: gpio: port lsgpio to v2 uAPI
  gpio: uapi: document uAPI v1 as deprecated
  gpiolib: cdev: support setting debounce
  gpiolib: cdev: support GPIO_V2_LINE_SET_VALUES_IOCTL
  gpiolib: cdev: support GPIO_V2_LINE_SET_CONFIG_IOCTL
  gpiolib: cdev: support edge detection for uAPI v2
  gpiolib: cdev: support GPIO_V2_GET_LINEINFO_IOCTL and GPIO_V2_GET_LINEINFO_WATCH_IOCTL
  gpiolib: cdev: support GPIO_V2_GET_LINE_IOCTL and GPIO_V2_LINE_GET_VALUES_IOCTL
  gpiolib: add build option for CDEV v1 ABI
  gpiolib: make cdev a build option
  ...

22 files changed, 1782 insertions, 502 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 8030fd91a3cc..e1376466d8b0 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -66,8 +66,33 @@ config GPIO_SYSFS
 
 	  This ABI is deprecated. If you want to use GPIO from userspace,
 	  use the character device /dev/gpiochipN with the appropriate
-	  ioctl() operations instead. The character device is always
-	  available.
+	  ioctl() operations instead.
+
+config GPIO_CDEV
+	bool
+	prompt "Character device (/dev/gpiochipN) support" if EXPERT
+	default y
+	help
+	  Say Y here to add the character device /dev/gpiochipN interface
+	  for GPIOs. The character device allows userspace to control GPIOs
+	  using ioctl() operations.
+
+	  Only say N if you are sure that the GPIO character device is not
+	  required.
+
+	  If unsure, say Y.
+
+config GPIO_CDEV_V1
+	bool "Support GPIO ABI Version 1"
+	default y
+	depends on GPIO_CDEV
+	help
+	  Say Y here to support version 1 of the GPIO CDEV ABI.
+
+	  This ABI version is deprecated.
+	  Please use the latest ABI for new developments.
+
+	  If unsure, say Y.
 
 config GPIO_GENERIC
 	depends on HAS_IOMEM # Only for IOMEM drivers
@@ -202,7 +227,7 @@ config GPIO_DAVINCI
 config GPIO_DWAPB
 	tristate "Synopsys DesignWare APB GPIO driver"
 	select GPIO_GENERIC
-	select GENERIC_IRQ_CHIP
+	select GPIOLIB_IRQCHIP
 	help
 	  Say Y or M here to build support for the Synopsys DesignWare APB
 	  GPIO block.
@@ -397,7 +422,7 @@ config GPIO_MVEBU
 	select REGMAP_MMIO
 
 config GPIO_MXC
-	def_bool y
+	tristate "i.MX GPIO support"
 	depends on ARCH_MXC || COMPILE_TEST
 	select GPIO_GENERIC
 	select GENERIC_IRQ_CHIP
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 4f9abff4f2dc..6c3791a55a7b 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -6,9 +6,8 @@ ccflags-$(CONFIG_DEBUG_GPIO)	+= -DDEBUG
 obj-$(CONFIG_GPIOLIB)		+= gpiolib.o
 obj-$(CONFIG_GPIOLIB)		+= gpiolib-devres.o
 obj-$(CONFIG_GPIOLIB)		+= gpiolib-legacy.o
-obj-$(CONFIG_GPIOLIB)		+= gpiolib-devprop.o
-obj-$(CONFIG_GPIOLIB)		+= gpiolib-cdev.o
 obj-$(CONFIG_OF_GPIO)		+= gpiolib-of.o
+obj-$(CONFIG_GPIO_CDEV)		+= gpiolib-cdev.o
 obj-$(CONFIG_GPIO_SYSFS)	+= gpiolib-sysfs.o
 obj-$(CONFIG_GPIO_ACPI)		+= gpiolib-acpi.o
 
diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
index 424a3d25350b..dfd8a4876a27 100644
--- a/drivers/gpio/gpio-aggregator.c
+++ b/drivers/gpio/gpio-aggregator.c
@@ -333,20 +333,14 @@ static int gpio_fwd_get(struct gpio_chip *chip, unsigned int offset)
 	return gpiod_get_value(fwd->descs[offset]);
 }
 
-static int gpio_fwd_get_multiple(struct gpio_chip *chip, unsigned long *mask,
+static int gpio_fwd_get_multiple(struct gpiochip_fwd *fwd, unsigned long *mask,
 				 unsigned long *bits)
 {
-	struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
-	unsigned long *values, flags = 0;
 	struct gpio_desc **descs;
+	unsigned long *values;
 	unsigned int i, j = 0;
 	int error;
 
-	if (chip->can_sleep)
-		mutex_lock(&fwd->mlock);
-	else
-		spin_lock_irqsave(&fwd->slock, flags);
-
 	/* Both values bitmap and desc pointers are stored in tmp[] */
 	values = &fwd->tmp[0];
 	descs = (void *)&fwd->tmp[BITS_TO_LONGS(fwd->chip.ngpio)];
@@ -356,16 +350,32 @@ static int gpio_fwd_get_multiple(struct gpio_chip *chip, unsigned long *mask,
 		descs[j++] = fwd->descs[i];
 
 	error = gpiod_get_array_value(j, descs, NULL, values);
-	if (!error) {
-		j = 0;
-		for_each_set_bit(i, mask, fwd->chip.ngpio)
-			__assign_bit(i, bits, test_bit(j++, values));
-	}
+	if (error)
+		return error;
 
-	if (chip->can_sleep)
+	j = 0;
+	for_each_set_bit(i, mask, fwd->chip.ngpio)
+		__assign_bit(i, bits, test_bit(j++, values));
+
+	return 0;
+}
+
+static int gpio_fwd_get_multiple_locked(struct gpio_chip *chip,
+					unsigned long *mask, unsigned long *bits)
+{
+	struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
+	unsigned long flags;
+	int error;
+
+	if (chip->can_sleep) {
+		mutex_lock(&fwd->mlock);
+		error = gpio_fwd_get_multiple(fwd, mask, bits);
 		mutex_unlock(&fwd->mlock);
-	else
+	} else {
+		spin_lock_irqsave(&fwd->slock, flags);
+		error = gpio_fwd_get_multiple(fwd, mask, bits);
 		spin_unlock_irqrestore(&fwd->slock, flags);
+	}
 
 	return error;
 }
@@ -377,19 +387,13 @@ static void gpio_fwd_set(struct gpio_chip *chip, unsigned int offset, int value)
 	gpiod_set_value(fwd->descs[offset], value);
 }
 
-static void gpio_fwd_set_multiple(struct gpio_chip *chip, unsigned long *mask,
+static void gpio_fwd_set_multiple(struct gpiochip_fwd *fwd, unsigned long *mask,
 				  unsigned long *bits)
 {
-	struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
-	unsigned long *values, flags = 0;
 	struct gpio_desc **descs;
+	unsigned long *values;
 	unsigned int i, j = 0;
 
-	if (chip->can_sleep)
-		mutex_lock(&fwd->mlock);
-	else
-		spin_lock_irqsave(&fwd->slock, flags);
-
 	/* Both values bitmap and desc pointers are stored in tmp[] */
 	values = &fwd->tmp[0];
 	descs = (void *)&fwd->tmp[BITS_TO_LONGS(fwd->chip.ngpio)];
@@ -400,11 +404,23 @@ static void gpio_fwd_set_multiple(struct gpio_chip *chip, unsigned long *mask,
 	}
 
 	gpiod_set_array_value(j, descs, NULL, values);
+}
 
-	if (chip->can_sleep)
+static void gpio_fwd_set_multiple_locked(struct gpio_chip *chip,
+					 unsigned long *mask, unsigned long *bits)
+{
+	struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
+	unsigned long flags;
+
+	if (chip->can_sleep) {
+		mutex_lock(&fwd->mlock);
+		gpio_fwd_set_multiple(fwd, mask, bits);
 		mutex_unlock(&fwd->mlock);
-	else
+	} else {
+		spin_lock_irqsave(&fwd->slock, flags);
+		gpio_fwd_set_multiple(fwd, mask, bits);
 		spin_unlock_irqrestore(&fwd->slock, flags);
+	}
 }
 
 static int gpio_fwd_set_config(struct gpio_chip *chip, unsigned int offset,
@@ -470,9 +486,9 @@ static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev,
 	chip->direction_input = gpio_fwd_direction_input;
 	chip->direction_output = gpio_fwd_direction_output;
 	chip->get = gpio_fwd_get;
-	chip->get_multiple = gpio_fwd_get_multiple;
+	chip->get_multiple = gpio_fwd_get_multiple_locked;
 	chip->set = gpio_fwd_set;
-	chip->set_multiple = gpio_fwd_set_multiple;
+	chip->set_multiple = gpio_fwd_set_multiple_locked;
 	chip->base = -1;
 	chip->ngpio = ngpios;
 	fwd->descs = descs;
diff --git a/drivers/gpio/gpio-bcm-kona.c b/drivers/gpio/gpio-bcm-kona.c
index cf3687a7925f..1e6b427f2c4a 100644
--- a/drivers/gpio/gpio-bcm-kona.c
+++ b/drivers/gpio/gpio-bcm-kona.c
@@ -590,10 +590,7 @@ static int bcm_kona_gpio_probe(struct platform_device *pdev)
 		dev_err(dev, "Couldn't determine # GPIO banks\n");
 		return -ENOENT;
 	} else if (ret < 0) {
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "Couldn't determine GPIO banks: (%pe)\n",
-				ERR_PTR(ret));
-		return ret;
+		return dev_err_probe(dev, ret, "Couldn't determine GPIO banks\n");
 	}
 	kona_gpio->num_bank = ret;
 
diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
index 085b874db2a9..6f2138503726 100644
--- a/drivers/gpio/gpio-davinci.c
+++ b/drivers/gpio/gpio-davinci.c
@@ -237,12 +237,8 @@ static int davinci_gpio_probe(struct platform_device *pdev)
 
 	for (i = 0; i < nirq; i++) {
 		chips->irqs[i] = platform_get_irq(pdev, i);
-		if (chips->irqs[i] < 0) {
-			if (chips->irqs[i] != -EPROBE_DEFER)
-				dev_info(dev, "IRQ not populated, err = %d\n",
-					 chips->irqs[i]);
-			return chips->irqs[i];
-		}
+		if (chips->irqs[i] < 0)
+			return dev_err_probe(dev, chips->irqs[i], "IRQ not populated\n");
 	}
 
 	chips->chip.label = dev_name(dev);
diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index 1d8d55bd63aa..a5b326754124 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -13,7 +13,6 @@
 #include <linux/io.h>
 #include <linux/ioport.h>
 #include <linux/irq.h>
-#include <linux/irqdomain.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
@@ -83,22 +82,29 @@ struct dwapb_context {
 };
 #endif
 
+struct dwapb_gpio_port_irqchip {
+	struct irq_chip		irqchip;
+	unsigned int		nr_irqs;
+	unsigned int		irq[DWAPB_MAX_GPIOS];
+};
+
 struct dwapb_gpio_port {
 	struct gpio_chip	gc;
-	bool			is_registered;
+	struct dwapb_gpio_port_irqchip *pirq;
 	struct dwapb_gpio	*gpio;
 #ifdef CONFIG_PM_SLEEP
 	struct dwapb_context	*ctx;
 #endif
 	unsigned int		idx;
 };
+#define to_dwapb_gpio(_gc) \
+	(container_of(_gc, struct dwapb_gpio_port, gc)->gpio)
 
 struct dwapb_gpio {
 	struct	device		*dev;
 	void __iomem		*regs;
 	struct dwapb_gpio_port	*ports;
 	unsigned int		nr_ports;
-	struct irq_domain	*domain;
 	unsigned int		flags;
 	struct reset_control	*rst;
 	struct clk_bulk_data	clks[DWAPB_NR_CLOCKS];
@@ -147,14 +153,6 @@ static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset,
 	gc->write_reg(reg_base + gpio_reg_convert(gpio, offset), val);
 }
 
-static int dwapb_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
-{
-	struct dwapb_gpio_port *port = gpiochip_get_data(gc);
-	struct dwapb_gpio *gpio = port->gpio;
-
-	return irq_find_mapping(gpio->domain, offset);
-}
-
 static struct dwapb_gpio_port *dwapb_offs_to_port(struct dwapb_gpio *gpio, unsigned int offs)
 {
 	struct dwapb_gpio_port *port;
@@ -162,7 +160,7 @@ static struct dwapb_gpio_port *dwapb_offs_to_port(struct dwapb_gpio *gpio, unsig
 
 	for (i = 0; i < gpio->nr_ports; i++) {
 		port = &gpio->ports[i];
-		if (port->idx == offs / 32)
+		if (port->idx == offs / DWAPB_MAX_GPIOS)
 			return port;
 	}
 
@@ -182,7 +180,7 @@ static void dwapb_toggle_trigger(struct dwapb_gpio *gpio, unsigned int offs)
 
 	pol = dwapb_read(gpio, GPIO_INT_POLARITY);
 	/* Just read the current value right out of the data register */
-	val = gc->get(gc, offs % 32);
+	val = gc->get(gc, offs % DWAPB_MAX_GPIOS);
 	if (val)
 		pol &= ~BIT(offs);
 	else
@@ -193,12 +191,13 @@ static void dwapb_toggle_trigger(struct dwapb_gpio *gpio, unsigned int offs)
 
 static u32 dwapb_do_irq(struct dwapb_gpio *gpio)
 {
+	struct gpio_chip *gc = &gpio->ports[0].gc;
 	unsigned long irq_status;
 	irq_hw_number_t hwirq;
 
 	irq_status = dwapb_read(gpio, GPIO_INTSTATUS);
-	for_each_set_bit(hwirq, &irq_status, 32) {
-		int gpio_irq = irq_find_mapping(gpio->domain, hwirq);
+	for_each_set_bit(hwirq, &irq_status, DWAPB_MAX_GPIOS) {
+		int gpio_irq = irq_find_mapping(gc->irq.domain, hwirq);
 		u32 irq_type = irq_get_trigger_type(gpio_irq);
 
 		generic_handle_irq(gpio_irq);
@@ -220,11 +219,53 @@ static void dwapb_irq_handler(struct irq_desc *desc)
 	chained_irq_exit(chip, desc);
 }
 
+static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id)
+{
+	return IRQ_RETVAL(dwapb_do_irq(dev_id));
+}
+
+static void dwapb_irq_ack(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+	u32 val = BIT(irqd_to_hwirq(d));
+	unsigned long flags;
+
+	spin_lock_irqsave(&gc->bgpio_lock, flags);
+	dwapb_write(gpio, GPIO_PORTA_EOI, val);
+	spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+
+static void dwapb_irq_mask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+	unsigned long flags;
+	u32 val;
+
+	spin_lock_irqsave(&gc->bgpio_lock, flags);
+	val = dwapb_read(gpio, GPIO_INTMASK) | BIT(irqd_to_hwirq(d));
+	dwapb_write(gpio, GPIO_INTMASK, val);
+	spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+
+static void dwapb_irq_unmask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
+	unsigned long flags;
+	u32 val;
+
+	spin_lock_irqsave(&gc->bgpio_lock, flags);
+	val = dwapb_read(gpio, GPIO_INTMASK) & ~BIT(irqd_to_hwirq(d));
+	dwapb_write(gpio, GPIO_INTMASK, val);
+	spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+
 static void dwapb_irq_enable(struct irq_data *d)
 {
-	struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
-	struct dwapb_gpio *gpio = igc->private;
-	struct gpio_chip *gc = &gpio->ports[0].gc;
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
 	unsigned long flags;
 	u32 val;
 
@@ -237,9 +278,8 @@ static void dwapb_irq_enable(struct irq_data *d)
 
 static void dwapb_irq_disable(struct irq_data *d)
 {
-	struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
-	struct dwapb_gpio *gpio = igc->private;
-	struct gpio_chip *gc = &gpio->ports[0].gc;
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
 	unsigned long flags;
 	u32 val;
 
@@ -252,9 +292,8 @@ static void dwapb_irq_disable(struct irq_data *d)
 
 static int dwapb_irq_set_type(struct irq_data *d, u32 type)
 {
-	struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
-	struct dwapb_gpio *gpio = igc->private;
-	struct gpio_chip *gc = &gpio->ports[0].gc;
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
 	irq_hw_number_t bit = irqd_to_hwirq(d);
 	unsigned long level, polarity, flags;
 
@@ -288,7 +327,10 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type)
 		break;
 	}
 
-	irq_setup_alt_chip(d, type);
+	if (type & IRQ_TYPE_LEVEL_MASK)
+		irq_set_handler_locked(d, handle_level_irq);
+	else if (type & IRQ_TYPE_EDGE_BOTH)
+		irq_set_handler_locked(d, handle_edge_irq);
 
 	dwapb_write(gpio, GPIO_INTTYPE_LEVEL, level);
 	if (type != IRQ_TYPE_EDGE_BOTH)
@@ -349,84 +391,67 @@ static int dwapb_gpio_set_config(struct gpio_chip *gc, unsigned offset,
 	return dwapb_gpio_set_debounce(gc, offset, debounce);
 }
 
-static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id)
+static int dwapb_convert_irqs(struct dwapb_gpio_port_irqchip *pirq,
+			      struct dwapb_port_property *pp)
 {
-	return IRQ_RETVAL(dwapb_do_irq(dev_id));
+	int i;
+
+	/* Group all available IRQs into an array of parental IRQs. */
+	for (i = 0; i < pp->ngpio; ++i) {
+		if (!pp->irq[i])
+			continue;
+
+		pirq->irq[pirq->nr_irqs++] = pp->irq[i];
+	}
+
+	return pirq->nr_irqs ? 0 : -ENOENT;
 }
 
 static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
 				 struct dwapb_gpio_port *port,
 				 struct dwapb_port_property *pp)
 {
+	struct dwapb_gpio_port_irqchip *pirq;
 	struct gpio_chip *gc = &port->gc;
-	struct fwnode_handle  *fwnode = pp->fwnode;
-	struct irq_chip_generic	*irq_gc = NULL;
-	unsigned int ngpio = gc->ngpio;
-	struct irq_chip_type *ct;
-	irq_hw_number_t hwirq;
-	int err, i;
-
-	if (memchr_inv(pp->irq, 0, sizeof(pp->irq)) == NULL) {
-		dev_warn(gpio->dev, "no IRQ for port%d\n", pp->idx);
-		return;
-	}
-
-	gpio->domain = irq_domain_create_linear(fwnode, ngpio,
-						 &irq_generic_chip_ops, gpio);
-	if (!gpio->domain)
-		return;
+	struct gpio_irq_chip *girq;
+	int err;
 
-	err = irq_alloc_domain_generic_chips(gpio->domain, ngpio, 2,
-					     DWAPB_DRIVER_NAME, handle_bad_irq,
-					     IRQ_NOREQUEST, 0,
-					     IRQ_GC_INIT_NESTED_LOCK);
-	if (err) {
-		dev_info(gpio->dev, "irq_alloc_domain_generic_chips failed\n");
-		irq_domain_remove(gpio->domain);
-		gpio->domain = NULL;
+	pirq = devm_kzalloc(gpio->dev, sizeof(*pirq), GFP_KERNEL);
+	if (!pirq)
 		return;
-	}
 
-	irq_gc = irq_get_domain_generic_chip(gpio->domain, 0);
-	if (!irq_gc) {
-		irq_domain_remove(gpio->domain);
-		gpio->domain = NULL;
-		return;
+	if (dwapb_convert_irqs(pirq, pp)) {
+		dev_warn(gpio->dev, "no IRQ for port%d\n", pp->idx);
+		goto err_kfree_pirq;
 	}
 
-	irq_gc->reg_base = gpio->regs;
-	irq_gc->private = gpio;
-
-	for (i = 0; i < 2; i++) {
-		ct = &irq_gc->chip_types[i];
-		ct->chip.irq_ack = irq_gc_ack_set_bit;
-		ct->chip.irq_mask = irq_gc_mask_set_bit;
-		ct->chip.irq_unmask = irq_gc_mask_clr_bit;
-		ct->chip.irq_set_type = dwapb_irq_set_type;
-		ct->chip.irq_enable = dwapb_irq_enable;
-		ct->chip.irq_disable = dwapb_irq_disable;
+	girq = &gc->irq;
+	girq->handler = handle_bad_irq;
+	girq->default_type = IRQ_TYPE_NONE;
+
+	port->pirq = pirq;
+	pirq->irqchip.name = DWAPB_DRIVER_NAME;
+	pirq->irqchip.irq_ack = dwapb_irq_ack;
+	pirq->irqchip.irq_mask = dwapb_irq_mask;
+	pirq->irqchip.irq_unmask = dwapb_irq_unmask;
+	pirq->irqchip.irq_set_type = dwapb_irq_set_type;
+	pirq->irqchip.irq_enable = dwapb_irq_enable;
+	pirq->irqchip.irq_disable = dwapb_irq_disable;
 #ifdef CONFIG_PM_SLEEP
-		ct->chip.irq_set_wake = dwapb_irq_set_wake;
+	pirq->irqchip.irq_set_wake = dwapb_irq_set_wake;
 #endif
-		ct->regs.ack = gpio_reg_convert(gpio, GPIO_PORTA_EOI);
-		ct->regs.mask = gpio_reg_convert(gpio, GPIO_INTMASK);
-		ct->type = IRQ_TYPE_LEVEL_MASK;
-	}
-
-	irq_gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK;
-	irq_gc->chip_types[0].handler = handle_level_irq;
-	irq_gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH;
-	irq_gc->chip_types[1].handler = handle_edge_irq;
 
 	if (!pp->irq_shared) {
-		int i;
-
-		for (i = 0; i < pp->ngpio; i++) {
-			if (pp->irq[i])
-				irq_set_chained_handler_and_data(pp->irq[i],
-						dwapb_irq_handler, gpio);
-		}
+		girq->num_parents = pirq->nr_irqs;
+		girq->parents = pirq->irq;
+		girq->parent_handler_data = gpio;
+		girq->parent_handler = dwapb_irq_handler;
 	} else {
+		/* This will let us handle the parent IRQ in the driver */
+		girq->num_parents = 0;
+		girq->parents = NULL;
+		girq->parent_handler = NULL;
+
 		/*
 		 * Request a shared IRQ since where MFD would have devices
 		 * using the same irq pin
@@ -436,33 +461,16 @@ static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
 				       IRQF_SHARED, DWAPB_DRIVER_NAME, gpio);
 		if (err) {
 			dev_err(gpio->dev, "error requesting IRQ\n");
-			irq_domain_remove(gpio->domain);
-			gpio->domain = NULL;
-			return;
+			goto err_kfree_pirq;
 		}
 	}
 
-	for (hwirq = 0; hwirq < ngpio; hwirq++)
-		irq_create_mapping(gpio->domain, hwirq);
-
-	port->gc.to_irq = dwapb_gpio_to_irq;
-}
-
-static void dwapb_irq_teardown(struct dwapb_gpio *gpio)
-{
-	struct dwapb_gpio_port *port = &gpio->ports[0];
-	struct gpio_chip *gc = &port->gc;
-	unsigned int ngpio = gc->ngpio;
-	irq_hw_number_t hwirq;
-
-	if (!gpio->domain)
-		return;
+	girq->chip = &pirq->irqchip;
 
-	for (hwirq = 0; hwirq < ngpio; hwirq++)
-		irq_dispose_mapping(irq_find_mapping(gpio->domain, hwirq));
+	return;
 
-	irq_domain_remove(gpio->domain);
-	gpio->domain = NULL;
+err_kfree_pirq:
+	devm_kfree(gpio->dev, pirq);
 }
 
 static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
@@ -510,36 +518,16 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
 	if (pp->idx == 0)
 		dwapb_configure_irqs(gpio, port, pp);
 
-	err = gpiochip_add_data(&port->gc, port);
+	err = devm_gpiochip_add_data(gpio->dev, &port->gc, port);
 	if (err) {
 		dev_err(gpio->dev, "failed to register gpiochip for port%d\n",
 			port->idx);
 		return err;
 	}
 
-	/* Add GPIO-signaled ACPI event support */
-	acpi_gpiochip_request_interrupts(&port->gc);
-
-	port->is_registered = true;
-
 	return 0;
 }
 
-static void dwapb_gpio_unregister(struct dwapb_gpio *gpio)
-{
-	unsigned int m;
-
-	for (m = 0; m < gpio->nr_ports; ++m) {
-		struct dwapb_gpio_port *port = &gpio->ports[m];
-
-		if (!port->is_registered)
-			continue;
-
-		acpi_gpiochip_free_interrupts(&port->gc);
-		gpiochip_remove(&port->gc);
-	}
-}
-
 static void dwapb_get_irq(struct device *dev, struct fwnode_handle *fwnode,
 			  struct dwapb_port_property *pp)
 {
@@ -594,11 +582,12 @@ static struct dwapb_platform_data *dwapb_gpio_get_pdata(struct device *dev)
 			return ERR_PTR(-EINVAL);
 		}
 
-		if (fwnode_property_read_u32(fwnode, "snps,nr-gpios", &pp->ngpio)) {
+		if (fwnode_property_read_u32(fwnode, "ngpios", &pp->ngpio) &&
+		    fwnode_property_read_u32(fwnode, "snps,nr-gpios", &pp->ngpio)) {
 			dev_info(dev,
 				 "failed to get number of gpios for port%d\n",
 				 i);
-			pp->ngpio = 32;
+			pp->ngpio = DWAPB_MAX_GPIOS;
 		}
 
 		pp->irq_shared	= false;
@@ -615,6 +604,62 @@ static struct dwapb_platform_data *dwapb_gpio_get_pdata(struct device *dev)
 	return pdata;
 }
 
+static void dwapb_assert_reset(void *data)
+{
+	struct dwapb_gpio *gpio = data;
+
+	reset_control_assert(gpio->rst);
+}
+
+static int dwapb_get_reset(struct dwapb_gpio *gpio)
+{
+	int err;
+
+	gpio->rst = devm_reset_control_get_optional_shared(gpio->dev, NULL);
+	if (IS_ERR(gpio->rst)) {
+		dev_err(gpio->dev, "Cannot get reset descriptor\n");
+		return PTR_ERR(gpio->rst);
+	}
+
+	err = reset_control_deassert(gpio->rst);
+	if (err) {
+		dev_err(gpio->dev, "Cannot deassert reset lane\n");
+		return err;
+	}
+
+	return devm_add_action_or_reset(gpio->dev, dwapb_assert_reset, gpio);
+}
+
+static void dwapb_disable_clks(void *data)
+{
+	struct dwapb_gpio *gpio = data;
+
+	clk_bulk_disable_unprepare(DWAPB_NR_CLOCKS, gpio->clks);
+}
+
+static int dwapb_get_clks(struct dwapb_gpio *gpio)
+{
+	int err;
+
+	/* Optional bus and debounce clocks */
+	gpio->clks[0].id = "bus";
+	gpio->clks[1].id = "db";
+	err = devm_clk_bulk_get_optional(gpio->dev, DWAPB_NR_CLOCKS,
+					 gpio->clks);
+	if (err) {
+		dev_err(gpio->dev, "Cannot get APB/Debounce clocks\n");
+		return err;
+	}
+
+	err = clk_bulk_prepare_enable(DWAPB_NR_CLOCKS, gpio->clks);
+	if (err) {
+		dev_err(gpio->dev, "Cannot enable APB/Debounce clocks\n");
+		return err;
+	}
+
+	return devm_add_action_or_reset(gpio->dev, dwapb_disable_clks, gpio);
+}
+
 static const struct of_device_id dwapb_of_match[] = {
 	{ .compatible = "snps,dw-apb-gpio", .data = (void *)0},
 	{ .compatible = "apm,xgene-gpio-v2", .data = (void *)GPIO_REG_OFFSET_V2},
@@ -654,11 +699,9 @@ static int dwapb_gpio_probe(struct platform_device *pdev)
 	gpio->dev = &pdev->dev;
 	gpio->nr_ports = pdata->nports;
 
-	gpio->rst = devm_reset_control_get_optional_shared(dev, NULL);
-	if (IS_ERR(gpio->rst))
-		return PTR_ERR(gpio->rst);
-
-	reset_control_deassert(gpio->rst);
+	err = dwapb_get_reset(gpio);
+	if (err)
+		return err;
 
 	gpio->ports = devm_kcalloc(&pdev->dev, gpio->nr_ports,
 				   sizeof(*gpio->ports), GFP_KERNEL);
@@ -669,49 +712,17 @@ static int dwapb_gpio_probe(struct platform_device *pdev)
 	if (IS_ERR(gpio->regs))
 		return PTR_ERR(gpio->regs);
 
-	/* Optional bus and debounce clocks */
-	gpio->clks[0].id = "bus";
-	gpio->clks[1].id = "db";
-	err = devm_clk_bulk_get_optional(&pdev->dev, DWAPB_NR_CLOCKS,
-					 gpio->clks);
-	if (err) {
-		dev_err(&pdev->dev, "Cannot get APB/Debounce clocks\n");
-		return err;
-	}
-
-	err = clk_bulk_prepare_enable(DWAPB_NR_CLOCKS, gpio->clks);
-	if (err) {
-		dev_err(&pdev->dev, "Cannot enable APB/Debounce clocks\n");
+	err = dwapb_get_clks(gpio);
+	if (err)
 		return err;
-	}
 
 	gpio->flags = (uintptr_t)device_get_match_data(dev);
 
 	for (i = 0; i < gpio->nr_ports; i++) {
 		err = dwapb_gpio_add_port(gpio, &pdata->properties[i], i);
 		if (err)
-			goto out_unregister;
+			return err;
 	}
-	platform_set_drvdata(pdev, gpio);
-
-	return 0;
-
-out_unregister:
-	dwapb_gpio_unregister(gpio);
-	dwapb_irq_teardown(gpio);
-	clk_bulk_disable_unprepare(DWAPB_NR_CLOCKS, gpio->clks);
-
-	return err;
-}
-
-static int dwapb_gpio_remove(struct platform_device *pdev)
-{
-	struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
-
-	dwapb_gpio_unregister(gpio);
-	dwapb_irq_teardown(gpio);
-	reset_control_assert(gpio->rst);
-	clk_bulk_disable_unprepare(DWAPB_NR_CLOCKS, gpio->clks);
 
 	return 0;
 }
@@ -815,7 +826,6 @@ static struct platform_driver dwapb_gpio_driver = {
 		.acpi_match_table = dwapb_acpi_match,
 	},
 	.probe		= dwapb_gpio_probe,
-	.remove		= dwapb_gpio_remove,
 };
 
 module_platform_driver(dwapb_gpio_driver);
diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index 1652897fdf90..67ed4f238d43 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -7,10 +7,10 @@
  * Copyright (C) 2017 Bartosz Golaszewski <brgl@bgdev.pl>
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/debugfs.h>
-#include <linux/gpio/consumer.h>
 #include <linux/gpio/driver.h>
-#include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irq_sim.h>
@@ -19,21 +19,19 @@
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/slab.h>
+#include <linux/string_helpers.h>
 #include <linux/uaccess.h>
 
 #include "gpiolib.h"
 
-#define GPIO_MOCKUP_NAME	"gpio-mockup"
 #define GPIO_MOCKUP_MAX_GC	10
 /*
  * We're storing two values per chip: the GPIO base and the number
  * of GPIO lines.
  */
 #define GPIO_MOCKUP_MAX_RANGES	(GPIO_MOCKUP_MAX_GC * 2)
-/* Maximum of three properties + the sentinel. */
-#define GPIO_MOCKUP_MAX_PROP	4
-
-#define gpio_mockup_err(...)	pr_err(GPIO_MOCKUP_NAME ": " __VA_ARGS__)
+/* Maximum of four properties + the sentinel. */
+#define GPIO_MOCKUP_MAX_PROP	5
 
 /*
  * struct gpio_pin_status - structure describing a GPIO status
@@ -375,31 +373,6 @@ static void gpio_mockup_debugfs_setup(struct device *dev,
 		debugfs_create_file(name, 0200, chip->dbg_dir, priv,
 				    &gpio_mockup_debugfs_ops);
 	}
-
-	return;
-}
-
-static int gpio_mockup_name_lines(struct device *dev,
-				  struct gpio_mockup_chip *chip)
-{
-	struct gpio_chip *gc = &chip->gc;
-	char **names;
-	int i;
-
-	names = devm_kcalloc(dev, gc->ngpio, sizeof(char *), GFP_KERNEL);
-	if (!names)
-		return -ENOMEM;
-
-	for (i = 0; i < gc->ngpio; i++) {
-		names[i] = devm_kasprintf(dev, GFP_KERNEL,
-					  "%s-%d", gc->label, i);
-		if (!names[i])
-			return -ENOMEM;
-	}
-
-	gc->names = (const char *const *)names;
-
-	return 0;
 }
 
 static void gpio_mockup_dispose_mappings(void *data)
@@ -434,21 +407,14 @@ static int gpio_mockup_probe(struct platform_device *pdev)
 	if (rv)
 		return rv;
 
-	rv = device_property_read_string(dev, "chip-name", &name);
+	rv = device_property_read_string(dev, "chip-label", &name);
 	if (rv)
-		name = NULL;
+		name = dev_name(dev);
 
 	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;
 
-	if (!name) {
-		name = devm_kasprintf(dev, GFP_KERNEL,
-				      "%s-%c", pdev->name, pdev->id + 'A');
-		if (!name)
-			return -ENOMEM;
-	}
-
 	mutex_init(&chip->lock);
 
 	gc = &chip->gc;
@@ -476,12 +442,6 @@ static int gpio_mockup_probe(struct platform_device *pdev)
 	for (i = 0; i < gc->ngpio; i++)
 		chip->lines[i].dir = GPIO_LINE_DIRECTION_IN;
 
-	if (device_property_read_bool(dev, "named-gpio-lines")) {
-		rv = gpio_mockup_name_lines(dev, chip);
-		if (rv)
-			return rv;
-	}
-
 	chip->irq_sim_domain = devm_irq_domain_create_sim(dev, NULL,
 							  gc->ngpio);
 	if (IS_ERR(chip->irq_sim_domain))
@@ -502,7 +462,7 @@ static int gpio_mockup_probe(struct platform_device *pdev)
 
 static struct platform_driver gpio_mockup_driver = {
 	.driver = {
-		.name = GPIO_MOCKUP_NAME,
+		.name = "gpio-mockup",
 	},
 	.probe = gpio_mockup_probe,
 };
@@ -522,14 +482,80 @@ static void gpio_mockup_unregister_pdevs(void)
 	}
 }
 
-static int __init gpio_mockup_init(void)
+static __init char **gpio_mockup_make_line_names(const char *label,
+						 unsigned int num_lines)
+{
+	unsigned int i;
+	char **names;
+
+	names = kcalloc(num_lines + 1, sizeof(char *), GFP_KERNEL);
+	if (!names)
+		return NULL;
+
+	for (i = 0; i < num_lines; i++) {
+		names[i] = kasprintf(GFP_KERNEL, "%s-%u", label, i);
+		if (!names[i]) {
+			kfree_strarray(names, i);
+			return NULL;
+		}
+	}
+
+	return names;
+}
+
+static int __init gpio_mockup_register_chip(int idx)
 {
 	struct property_entry properties[GPIO_MOCKUP_MAX_PROP];
-	int i, prop, num_chips, err = 0, base;
 	struct platform_device_info pdevinfo;
 	struct platform_device *pdev;
+	char **line_names = NULL;
+	char chip_label[32];
+	int prop = 0, base;
 	u16 ngpio;
 
+	memset(properties, 0, sizeof(properties));
+	memset(&pdevinfo, 0, sizeof(pdevinfo));
+
+	snprintf(chip_label, sizeof(chip_label), "gpio-mockup-%c", idx + 'A');
+	properties[prop++] = PROPERTY_ENTRY_STRING("chip-label", chip_label);
+
+	base = gpio_mockup_range_base(idx);
+	if (base >= 0)
+		properties[prop++] = PROPERTY_ENTRY_U32("gpio-base", base);
+
+	ngpio = base < 0 ? gpio_mockup_range_ngpio(idx)
+			 : gpio_mockup_range_ngpio(idx) - base;
+	properties[prop++] = PROPERTY_ENTRY_U16("nr-gpios", ngpio);
+
+	if (gpio_mockup_named_lines) {
+		line_names = gpio_mockup_make_line_names(chip_label, ngpio);
+		if (!line_names)
+			return -ENOMEM;
+
+		properties[prop++] = PROPERTY_ENTRY_STRING_ARRAY_LEN(
+					"gpio-line-names", line_names, ngpio);
+	}
+
+	pdevinfo.name = "gpio-mockup";
+	pdevinfo.id = idx;
+	pdevinfo.properties = properties;
+
+	pdev = platform_device_register_full(&pdevinfo);
+	kfree_strarray(line_names, ngpio);
+	if (IS_ERR(pdev)) {
+		pr_err("error registering device");
+		return PTR_ERR(pdev);
+	}
+
+	gpio_mockup_pdevs[idx] = pdev;
+
+	return 0;
+}
+
+static int __init gpio_mockup_init(void)
+{
+	int i, num_chips, err;
+
 	if ((gpio_mockup_num_ranges < 2) ||
 	    (gpio_mockup_num_ranges % 2) ||
 	    (gpio_mockup_num_ranges > GPIO_MOCKUP_MAX_RANGES))
@@ -551,43 +577,19 @@ static int __init gpio_mockup_init(void)
 
 	err = platform_driver_register(&gpio_mockup_driver);
 	if (err) {
-		gpio_mockup_err("error registering platform driver\n");
+		pr_err("error registering platform driver\n");
 		debugfs_remove_recursive(gpio_mockup_dbg_dir);
 		return err;
 	}
 
 	for (i = 0; i < num_chips; i++) {
-		memset(properties, 0, sizeof(properties));
-		memset(&pdevinfo, 0, sizeof(pdevinfo));
-		prop = 0;
-
-		base = gpio_mockup_range_base(i);
-		if (base >= 0)
-			properties[prop++] = PROPERTY_ENTRY_U32("gpio-base",
-								base);
-
-		ngpio = base < 0 ? gpio_mockup_range_ngpio(i)
-				 : gpio_mockup_range_ngpio(i) - base;
-		properties[prop++] = PROPERTY_ENTRY_U16("nr-gpios", ngpio);
-
-		if (gpio_mockup_named_lines)
-			properties[prop++] = PROPERTY_ENTRY_BOOL(
-						"named-gpio-lines");
-
-		pdevinfo.name = GPIO_MOCKUP_NAME;
-		pdevinfo.id = i;
-		pdevinfo.properties = properties;
-
-		pdev = platform_device_register_full(&pdevinfo);
-		if (IS_ERR(pdev)) {
-			gpio_mockup_err("error registering device");
+		err = gpio_mockup_register_chip(i);
+		if (err) {
 			platform_driver_unregister(&gpio_mockup_driver);
 			gpio_mockup_unregister_pdevs();
 			debugfs_remove_recursive(gpio_mockup_dbg_dir);
-			return PTR_ERR(pdev);
+			return err;
 		}
-
-		gpio_mockup_pdevs[i] = pdev;
 	}
 
 	return 0;
diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index 1e866524a4bd..6dfca83bcd90 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -47,27 +47,6 @@ struct mpc8xxx_gpio_chip {
 	unsigned int irqn;
 };
 
-/* The GPIO Input Buffer Enable register(GPIO_IBE) is used to
- * control the input enable of each individual GPIO port.
- * When an individual GPIO port’s direction is set to
- * input (GPIO_GPDIR[DRn=0]), the associated input enable must be
- * set (GPIOxGPIE[IEn]=1) to propagate the port value to the GPIO
- * Data Register.
- */
-static int ls1028a_gpio_dir_in_init(struct gpio_chip *gc)
-{
-	unsigned long flags;
-	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
-
-	spin_lock_irqsave(&gc->bgpio_lock, flags);
-
-	gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
-
-	spin_unlock_irqrestore(&gc->bgpio_lock, flags);
-
-	return 0;
-}
-
 /*
  * This hardware has a big endian bit assignment such that GPIO line 0 is
  * connected to bit 31, line 1 to bit 30 ... line 31 to bit 0.
@@ -283,7 +262,6 @@ static const struct irq_domain_ops mpc8xxx_gpio_irq_ops = {
 };
 
 struct mpc8xxx_gpio_devtype {
-	int (*gpio_dir_in_init)(struct gpio_chip *chip);
 	int (*gpio_dir_out)(struct gpio_chip *, unsigned int, int);
 	int (*gpio_get)(struct gpio_chip *, unsigned int);
 	int (*irq_set_type)(struct irq_data *, unsigned int);
@@ -294,11 +272,6 @@ static const struct mpc8xxx_gpio_devtype mpc512x_gpio_devtype = {
 	.irq_set_type = mpc512x_irq_set_type,
 };
 
-static const struct mpc8xxx_gpio_devtype ls1028a_gpio_devtype = {
-	.gpio_dir_in_init = ls1028a_gpio_dir_in_init,
-	.irq_set_type = mpc8xxx_irq_set_type,
-};
-
 static const struct mpc8xxx_gpio_devtype mpc5125_gpio_devtype = {
 	.gpio_dir_out = mpc5125_gpio_dir_out,
 	.irq_set_type = mpc512x_irq_set_type,
@@ -319,8 +292,8 @@ static const struct of_device_id mpc8xxx_gpio_ids[] = {
 	{ .compatible = "fsl,mpc5121-gpio", .data = &mpc512x_gpio_devtype, },
 	{ .compatible = "fsl,mpc5125-gpio", .data = &mpc5125_gpio_devtype, },
 	{ .compatible = "fsl,pq3-gpio",     },
-	{ .compatible = "fsl,ls1028a-gpio", .data = &ls1028a_gpio_devtype, },
-	{ .compatible = "fsl,ls1088a-gpio", .data = &ls1028a_gpio_devtype, },
+	{ .compatible = "fsl,ls1028a-gpio", },
+	{ .compatible = "fsl,ls1088a-gpio", },
 	{ .compatible = "fsl,qoriq-gpio",   },
 	{}
 };
@@ -389,7 +362,16 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 
 	gc->to_irq = mpc8xxx_gpio_to_irq;
 
-	if (of_device_is_compatible(np, "fsl,qoriq-gpio"))
+	/*
+	 * The GPIO Input Buffer Enable register(GPIO_IBE) is used to control
+	 * the input enable of each individual GPIO port.  When an individual
+	 * GPIO port’s direction is set to input (GPIO_GPDIR[DRn=0]), the
+	 * associated input enable must be set (GPIOxGPIE[IEn]=1) to propagate
+	 * the port value to the GPIO Data Register.
+	 */
+	if (of_device_is_compatible(np, "fsl,qoriq-gpio") ||
+	    of_device_is_compatible(np, "fsl,ls1028a-gpio") ||
+	    of_device_is_compatible(np, "fsl,ls1088a-gpio"))
 		gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
 
 	ret = gpiochip_add_data(gc, mpc8xxx_gc);
@@ -411,9 +393,6 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 	/* ack and mask all irqs */
 	gc->write_reg(mpc8xxx_gc->regs + GPIO_IER, 0xffffffff);
 	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR, 0);
-	/* enable input buffer  */
-	if (devtype->gpio_dir_in_init)
-		devtype->gpio_dir_in_init(gc);
 
 	ret = devm_request_irq(&pdev->dev, mpc8xxx_gc->irqn,
 			       mpc8xxx_gpio_irq_cascade,
diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 64278a4756f0..643f4c557ac2 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -15,6 +15,7 @@
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/irqchip/chained_irq.h>
+#include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/syscore_ops.h>
@@ -158,6 +159,7 @@ static const struct of_device_id mxc_gpio_dt_ids[] = {
 	{ .compatible = "fsl,imx7d-gpio", .data = &mxc_gpio_devtype[IMX35_GPIO], },
 	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, mxc_gpio_dt_ids);
 
 /*
  * MX2 has one interrupt *for all* gpio ports. The list is used
@@ -604,3 +606,7 @@ static int __init gpio_mxc_init(void)
 	return platform_driver_register(&mxc_gpio_driver);
 }
 subsys_initcall(gpio_mxc_init);
+
+MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
+MODULE_DESCRIPTION("i.MX GPIO Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 0ea640fb636c..6d59e3a43761 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -1394,10 +1394,7 @@ static int omap_gpio_probe(struct platform_device *pdev)
 	if (bank->irq <= 0) {
 		if (!bank->irq)
 			bank->irq = -ENXIO;
-		if (bank->irq != -EPROBE_DEFER)
-			dev_err(dev,
-				"can't get irq resource ret=%d\n", bank->irq);
-		return bank->irq;
+		return dev_err_probe(dev, bank->irq, "can't get irq resource\n");
 	}
 
 	bank->chip.parent = dev;
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index c2d6121c48c9..825b362eb4b7 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -90,6 +90,7 @@ static const struct i2c_device_id pca953x_id[] = {
 	{ "pcal6416", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
 	{ "pcal6524", 24 | PCA953X_TYPE | PCA_LATCH_INT, },
 	{ "pcal9535", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
+	{ "pcal9554b", 8  | PCA953X_TYPE | PCA_LATCH_INT, },
 	{ "pcal9555a", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
 
 	{ "max7310", 8  | PCA953X_TYPE, },
@@ -1018,12 +1019,9 @@ static int pca953x_probe(struct i2c_client *client,
 	chip->client = client;
 
 	reg = devm_regulator_get(&client->dev, "vcc");
-	if (IS_ERR(reg)) {
-		ret = PTR_ERR(reg);
-		if (ret != -EPROBE_DEFER)
-			dev_err(&client->dev, "reg get err: %d\n", ret);
-		return ret;
-	}
+	if (IS_ERR(reg))
+		return dev_err_probe(&client->dev, PTR_ERR(reg), "reg get err\n");
+
 	ret = regulator_enable(reg);
 	if (ret) {
 		dev_err(&client->dev, "reg en err: %d\n", ret);
@@ -1255,6 +1253,7 @@ static const struct of_device_id pca953x_dt_ids[] = {
 	{ .compatible = "nxp,pcal6416", .data = OF_953X(16, PCA_LATCH_INT), },
 	{ .compatible = "nxp,pcal6524", .data = OF_953X(24, PCA_LATCH_INT), },
 	{ .compatible = "nxp,pcal9535", .data = OF_953X(16, PCA_LATCH_INT), },
+	{ .compatible = "nxp,pcal9554b", .data = OF_953X( 8, PCA_LATCH_INT), },
 	{ .compatible = "nxp,pcal9555a", .data = OF_953X(16, PCA_LATCH_INT), },
 
 	{ .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
diff --git a/drivers/gpio/gpio-pisosr.c b/drivers/gpio/gpio-pisosr.c
index 6698feabaced..8e04054cf07e 100644
--- a/drivers/gpio/gpio-pisosr.c
+++ b/drivers/gpio/gpio-pisosr.c
@@ -148,12 +148,9 @@ static int pisosr_gpio_probe(struct spi_device *spi)
 		return -ENOMEM;
 
 	gpio->load_gpio = devm_gpiod_get_optional(dev, "load", GPIOD_OUT_LOW);
-	if (IS_ERR(gpio->load_gpio)) {
-		ret = PTR_ERR(gpio->load_gpio);
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "Unable to allocate load GPIO\n");
-		return ret;
-	}
+	if (IS_ERR(gpio->load_gpio))
+		return dev_err_probe(dev, PTR_ERR(gpio->load_gpio),
+				     "Unable to allocate load GPIO\n");
 
 	mutex_init(&gpio->lock);
 
diff --git a/drivers/gpio/gpio-stp-xway.c b/drivers/gpio/gpio-stp-xway.c
index 9e23a5ae8108..0ce1543426a4 100644
--- a/drivers/gpio/gpio-stp-xway.c
+++ b/drivers/gpio/gpio-stp-xway.c
@@ -41,7 +41,10 @@
 #define XWAY_STP_4HZ		BIT(23)
 #define XWAY_STP_8HZ		BIT(24)
 #define XWAY_STP_10HZ		(BIT(24) | BIT(23))
-#define XWAY_STP_SPEED_MASK	(0xf << 23)
+#define XWAY_STP_SPEED_MASK	(BIT(23) | BIT(24) | BIT(25) | BIT(26) | BIT(27))
+
+#define XWAY_STP_FPIS_VALUE	BIT(21)
+#define XWAY_STP_FPIS_MASK	(BIT(20) | BIT(21))
 
 /* clock source for automatic update */
 #define XWAY_STP_UPD_FPI	BIT(31)
@@ -54,7 +57,9 @@
 /* 2 groups of 3 bits can be driven by the phys */
 #define XWAY_STP_PHY_MASK	0x7
 #define XWAY_STP_PHY1_SHIFT	27
-#define XWAY_STP_PHY2_SHIFT	15
+#define XWAY_STP_PHY2_SHIFT	3
+#define XWAY_STP_PHY3_SHIFT	6
+#define XWAY_STP_PHY4_SHIFT	15
 
 /* STP has 3 groups of 8 bits */
 #define XWAY_STP_GROUP0		BIT(0)
@@ -80,6 +85,8 @@ struct xway_stp {
 	u8 dsl;		/* the 2 LSBs can be driven by the dsl core */
 	u8 phy1;	/* 3 bits can be driven by phy1 */
 	u8 phy2;	/* 3 bits can be driven by phy2 */
+	u8 phy3;	/* 3 bits can be driven by phy3 */
+	u8 phy4;	/* 3 bits can be driven by phy4 */
 	u8 reserved;	/* mask out the hw driven bits in gpio_request */
 };
 
@@ -114,7 +121,8 @@ static void xway_stp_set(struct gpio_chip *gc, unsigned gpio, int val)
 	else
 		chip->shadow &= ~BIT(gpio);
 	xway_stp_w32(chip->virt, chip->shadow, XWAY_STP_CPU0);
-	xway_stp_w32_mask(chip->virt, 0, XWAY_STP_CON_SWU, XWAY_STP_CON0);
+	if (!chip->reserved)
+		xway_stp_w32_mask(chip->virt, 0, XWAY_STP_CON_SWU, XWAY_STP_CON0);
 }
 
 /**
@@ -188,16 +196,37 @@ static void xway_stp_hw_init(struct xway_stp *chip)
 			chip->phy2 << XWAY_STP_PHY2_SHIFT,
 			XWAY_STP_CON1);
 
+	if (of_machine_is_compatible("lantiq,grx390")
+	    || of_machine_is_compatible("lantiq,ar10")) {
+		xway_stp_w32_mask(chip->virt,
+				XWAY_STP_PHY_MASK << XWAY_STP_PHY3_SHIFT,
+				chip->phy3 << XWAY_STP_PHY3_SHIFT,
+				XWAY_STP_CON1);
+	}
+
+	if (of_machine_is_compatible("lantiq,grx390")) {
+		xway_stp_w32_mask(chip->virt,
+				XWAY_STP_PHY_MASK << XWAY_STP_PHY4_SHIFT,
+				chip->phy4 << XWAY_STP_PHY4_SHIFT,
+				XWAY_STP_CON1);
+	}
+
 	/* mask out the hw driven bits in gpio_request */
-	chip->reserved = (chip->phy2 << 5) | (chip->phy1 << 2) | chip->dsl;
+	chip->reserved = (chip->phy4 << 11) | (chip->phy3 << 8) | (chip->phy2 << 5)
+		| (chip->phy1 << 2) | chip->dsl;
 
 	/*
 	 * if we have pins that are driven by hw, we need to tell the stp what
 	 * clock to use as a timer.
 	 */
-	if (chip->reserved)
+	if (chip->reserved) {
 		xway_stp_w32_mask(chip->virt, XWAY_STP_UPD_MASK,
 			XWAY_STP_UPD_FPI, XWAY_STP_CON1);
+		xway_stp_w32_mask(chip->virt, XWAY_STP_SPEED_MASK,
+			XWAY_STP_10HZ, XWAY_STP_CON1);
+		xway_stp_w32_mask(chip->virt, XWAY_STP_FPIS_MASK,
+			XWAY_STP_FPIS_VALUE, XWAY_STP_CON1);
+	}
 }
 
 static int xway_stp_probe(struct platform_device *pdev)
@@ -242,13 +271,26 @@ static int xway_stp_probe(struct platform_device *pdev)
 	/* find out which gpios are controlled by the phys */
 	if (of_machine_is_compatible("lantiq,ar9") ||
 			of_machine_is_compatible("lantiq,gr9") ||
-			of_machine_is_compatible("lantiq,vr9")) {
+			of_machine_is_compatible("lantiq,vr9") ||
+			of_machine_is_compatible("lantiq,ar10") ||
+			of_machine_is_compatible("lantiq,grx390")) {
 		if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy1", &phy))
 			chip->phy1 = phy & XWAY_STP_PHY_MASK;
 		if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy2", &phy))
 			chip->phy2 = phy & XWAY_STP_PHY_MASK;
 	}
 
+	if (of_machine_is_compatible("lantiq,ar10") ||
+			of_machine_is_compatible("lantiq,grx390")) {
+		if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy3", &phy))
+			chip->phy3 = phy & XWAY_STP_PHY_MASK;
+	}
+
+	if (of_machine_is_compatible("lantiq,grx390")) {
+		if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy4", &phy))
+			chip->phy4 = phy & XWAY_STP_PHY_MASK;
+	}
+
 	/* check which edge trigger we should use, default to a falling edge */
 	if (!of_find_property(pdev->dev.of_node, "lantiq,rising", NULL))
 		chip->edge = XWAY_STP_FALLING;
diff --git a/drivers/gpio/gpio-tc3589x.c b/drivers/gpio/gpio-tc3589x.c
index ea3f68a28fea..55b8dbd13d11 100644
--- a/drivers/gpio/gpio-tc3589x.c
+++ b/drivers/gpio/gpio-tc3589x.c
@@ -19,9 +19,9 @@
  * These registers are modified under the irq bus lock and cached to avoid
  * unnecessary writes in bus_sync_unlock.
  */
-enum { REG_IBE, REG_IEV, REG_IS, REG_IE };
+enum { REG_IBE, REG_IEV, REG_IS, REG_IE, REG_DIRECT };
 
-#define CACHE_NR_REGS	4
+#define CACHE_NR_REGS	5
 #define CACHE_NR_BANKS	3
 
 struct tc3589x_gpio {
@@ -200,6 +200,7 @@ static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
 		[REG_IEV]	= TC3589x_GPIOIEV0,
 		[REG_IS]	= TC3589x_GPIOIS0,
 		[REG_IE]	= TC3589x_GPIOIE0,
+		[REG_DIRECT]	= TC3589x_DIRECT0,
 	};
 	int i, j;
 
@@ -228,6 +229,7 @@ static void tc3589x_gpio_irq_mask(struct irq_data *d)
 	int mask = BIT(offset % 8);
 
 	tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
+	tc3589x_gpio->regs[REG_DIRECT][regoffset] |= mask;
 }
 
 static void tc3589x_gpio_irq_unmask(struct irq_data *d)
@@ -239,6 +241,7 @@ static void tc3589x_gpio_irq_unmask(struct irq_data *d)
 	int mask = BIT(offset % 8);
 
 	tc3589x_gpio->regs[REG_IE][regoffset] |= mask;
+	tc3589x_gpio->regs[REG_DIRECT][regoffset] &= ~mask;
 }
 
 static struct irq_chip tc3589x_gpio_irq_chip = {
@@ -334,6 +337,17 @@ static int tc3589x_gpio_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
+	 /* For tc35894, have to disable Direct KBD interrupts,
+	  * else IRQST will always be 0x20, IRQN low level, can't
+	  * clear the irq status.
+	  * TODO: need more test on other tc3589x chip.
+	  *
+	  */
+	ret = tc3589x_reg_write(tc3589x, TC3589x_DKBDMSK,
+			TC3589x_DKBDMSK_ELINT | TC3589x_DKBDMSK_EINT);
+	if (ret < 0)
+		return ret;
+
 	ret = devm_request_threaded_irq(&pdev->dev,
 					irq, NULL, tc3589x_gpio_irq,
 					IRQF_ONESHOT, "tc3589x-gpio",
diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index 53d1387592fd..0b5a17ab996f 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -929,11 +929,9 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 
 	/* Retrieve GPIO clock */
 	gpio->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(gpio->clk)) {
-		if (PTR_ERR(gpio->clk) != -EPROBE_DEFER)
-			dev_err(&pdev->dev, "input clock not found.\n");
-		return PTR_ERR(gpio->clk);
-	}
+	if (IS_ERR(gpio->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(gpio->clk), "input clock not found.\n");
+
 	ret = clk_prepare_enable(gpio->clk);
 	if (ret) {
 		dev_err(&pdev->dev, "Unable to enable clock.\n");
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 54ca3c18b291..834a12f3219e 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -1221,9 +1221,6 @@ void acpi_gpiochip_add(struct gpio_chip *chip)
 		return;
 	}
 
-	if (!chip->names)
-		devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent));
-
 	acpi_gpiochip_request_regions(acpi_gpio);
 	acpi_gpiochip_scan_gpios(acpi_gpio);
 	acpi_walk_dep_device_list(handle);
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index fed5a3b2172f..e9faeaf65d14 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -1,9 +1,12 @@
 // SPDX-License-Identifier: GPL-2.0
 
 #include <linux/anon_inodes.h>
+#include <linux/atomic.h>
 #include <linux/bitmap.h>
+#include <linux/build_bug.h>
 #include <linux/cdev.h>
 #include <linux/compat.h>
+#include <linux/compiler.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/file.h>
@@ -14,16 +17,37 @@
 #include <linux/kernel.h>
 #include <linux/kfifo.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/poll.h>
 #include <linux/spinlock.h>
 #include <linux/timekeeping.h>
 #include <linux/uaccess.h>
+#include <linux/workqueue.h>
 #include <uapi/linux/gpio.h>
 
 #include "gpiolib.h"
 #include "gpiolib-cdev.h"
 
+/*
+ * Array sizes must ensure 64-bit alignment and not create holes in the
+ * struct packing.
+ */
+static_assert(IS_ALIGNED(GPIO_V2_LINES_MAX, 2));
+static_assert(IS_ALIGNED(GPIO_MAX_NAME_SIZE, 8));
+
+/*
+ * Check that uAPI structs are 64-bit aligned for 32/64-bit compatibility
+ */
+static_assert(IS_ALIGNED(sizeof(struct gpio_v2_line_attribute), 8));
+static_assert(IS_ALIGNED(sizeof(struct gpio_v2_line_config_attribute), 8));
+static_assert(IS_ALIGNED(sizeof(struct gpio_v2_line_config), 8));
+static_assert(IS_ALIGNED(sizeof(struct gpio_v2_line_request), 8));
+static_assert(IS_ALIGNED(sizeof(struct gpio_v2_line_info), 8));
+static_assert(IS_ALIGNED(sizeof(struct gpio_v2_line_info_changed), 8));
+static_assert(IS_ALIGNED(sizeof(struct gpio_v2_line_event), 8));
+static_assert(IS_ALIGNED(sizeof(struct gpio_v2_line_values), 8));
+
 /* Character device interface to GPIO.
  *
  * The GPIO character device, /dev/gpiochipN, provides userspace an
@@ -34,6 +58,7 @@
  * GPIO line handle management
  */
 
+#ifdef CONFIG_GPIO_CDEV_V1
 /**
  * struct linehandle_state - contains the state of a userspace handle
  * @gdev: the GPIO device the handle pertains to
@@ -159,7 +184,8 @@ static long linehandle_set_config(struct linehandle_state *lh,
 		}
 
 		blocking_notifier_call_chain(&desc->gdev->notifier,
-					     GPIOLINE_CHANGED_CONFIG, desc);
+					     GPIO_V2_LINE_CHANGED_CONFIG,
+					     desc);
 	}
 	return 0;
 }
@@ -281,11 +307,11 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
 	lh->gdev = gdev;
 	get_device(&gdev->dev);
 
-	/* Make sure this is terminated */
-	handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0';
-	if (strlen(handlereq.consumer_label)) {
-		lh->label = kstrdup(handlereq.consumer_label,
-				    GFP_KERNEL);
+	if (handlereq.consumer_label[0] != '\0') {
+		/* label is only initialized if consumer_label is set */
+		lh->label = kstrndup(handlereq.consumer_label,
+				     sizeof(handlereq.consumer_label) - 1,
+				     GFP_KERNEL);
 		if (!lh->label) {
 			ret = -ENOMEM;
 			goto out_free_lh;
@@ -331,7 +357,7 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
 		}
 
 		blocking_notifier_call_chain(&desc->gdev->notifier,
-					     GPIOLINE_CHANGED_REQUESTED, desc);
+					     GPIO_V2_LINE_CHANGED_REQUESTED, desc);
 
 		dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
 			offset);
@@ -376,6 +402,1036 @@ out_free_lh:
 	linehandle_free(lh);
 	return ret;
 }
+#endif /* CONFIG_GPIO_CDEV_V1 */
+
+/**
+ * struct line - contains the state of a requested line
+ * @desc: the GPIO descriptor for this line.
+ * @req: the corresponding line request
+ * @irq: the interrupt triggered in response to events on this GPIO
+ * @eflags: the edge flags, GPIO_V2_LINE_FLAG_EDGE_RISING and/or
+ * GPIO_V2_LINE_FLAG_EDGE_FALLING, indicating the edge detection applied
+ * @timestamp_ns: cache for the timestamp storing it between hardirq and
+ * IRQ thread, used to bring the timestamp close to the actual event
+ * @req_seqno: the seqno for the current edge event in the sequence of
+ * events for the corresponding line request. This is drawn from the @req.
+ * @line_seqno: the seqno for the current edge event in the sequence of
+ * events for this line.
+ * @work: the worker that implements software debouncing
+ * @sw_debounced: flag indicating if the software debouncer is active
+ * @level: the current debounced physical level of the line
+ */
+struct line {
+	struct gpio_desc *desc;
+	/*
+	 * -- edge detector specific fields --
+	 */
+	struct linereq *req;
+	unsigned int irq;
+	u64 eflags;
+	/*
+	 * timestamp_ns and req_seqno are accessed only by
+	 * edge_irq_handler() and edge_irq_thread(), which are themselves
+	 * mutually exclusive, so no additional protection is necessary.
+	 */
+	u64 timestamp_ns;
+	u32 req_seqno;
+	/*
+	 * line_seqno is accessed by either edge_irq_thread() or
+	 * debounce_work_func(), which are themselves mutually exclusive,
+	 * so no additional protection is necessary.
+	 */
+	u32 line_seqno;
+	/*
+	 * -- debouncer specific fields --
+	 */
+	struct delayed_work work;
+	/*
+	 * sw_debounce is accessed by linereq_set_config(), which is the
+	 * only setter, and linereq_get_values(), which can live with a
+	 * slightly stale value.
+	 */
+	unsigned int sw_debounced;
+	/*
+	 * level is accessed by debounce_work_func(), which is the only
+	 * setter, and linereq_get_values() which can live with a slightly
+	 * stale value.
+	 */
+	unsigned int level;
+};
+
+/**
+ * struct linereq - contains the state of a userspace line request
+ * @gdev: the GPIO device the line request pertains to
+ * @label: consumer label used to tag GPIO descriptors
+ * @num_lines: the number of lines in the lines array
+ * @wait: wait queue that handles blocking reads of events
+ * @event_buffer_size: the number of elements allocated in @events
+ * @events: KFIFO for the GPIO events
+ * @seqno: the sequence number for edge events generated on all lines in
+ * this line request.  Note that this is not used when @num_lines is 1, as
+ * the line_seqno is then the same and is cheaper to calculate.
+ * @config_mutex: mutex for serializing ioctl() calls to ensure consistency
+ * of configuration, particularly multi-step accesses to desc flags.
+ * @lines: the lines held by this line request, with @num_lines elements.
+ */
+struct linereq {
+	struct gpio_device *gdev;
+	const char *label;
+	u32 num_lines;
+	wait_queue_head_t wait;
+	u32 event_buffer_size;
+	DECLARE_KFIFO_PTR(events, struct gpio_v2_line_event);
+	atomic_t seqno;
+	struct mutex config_mutex;
+	struct line lines[];
+};
+
+#define GPIO_V2_LINE_BIAS_FLAGS \
+	(GPIO_V2_LINE_FLAG_BIAS_PULL_UP | \
+	 GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN | \
+	 GPIO_V2_LINE_FLAG_BIAS_DISABLED)
+
+#define GPIO_V2_LINE_DIRECTION_FLAGS \
+	(GPIO_V2_LINE_FLAG_INPUT | \
+	 GPIO_V2_LINE_FLAG_OUTPUT)
+
+#define GPIO_V2_LINE_DRIVE_FLAGS \
+	(GPIO_V2_LINE_FLAG_OPEN_DRAIN | \
+	 GPIO_V2_LINE_FLAG_OPEN_SOURCE)
+
+#define GPIO_V2_LINE_EDGE_FLAGS \
+	(GPIO_V2_LINE_FLAG_EDGE_RISING | \
+	 GPIO_V2_LINE_FLAG_EDGE_FALLING)
+
+#define GPIO_V2_LINE_VALID_FLAGS \
+	(GPIO_V2_LINE_FLAG_ACTIVE_LOW | \
+	 GPIO_V2_LINE_DIRECTION_FLAGS | \
+	 GPIO_V2_LINE_DRIVE_FLAGS | \
+	 GPIO_V2_LINE_EDGE_FLAGS | \
+	 GPIO_V2_LINE_BIAS_FLAGS)
+
+static void linereq_put_event(struct linereq *lr,
+			      struct gpio_v2_line_event *le)
+{
+	bool overflow = false;
+
+	spin_lock(&lr->wait.lock);
+	if (kfifo_is_full(&lr->events)) {
+		overflow = true;
+		kfifo_skip(&lr->events);
+	}
+	kfifo_in(&lr->events, le, 1);
+	spin_unlock(&lr->wait.lock);
+	if (!overflow)
+		wake_up_poll(&lr->wait, EPOLLIN);
+	else
+		pr_debug_ratelimited("event FIFO is full - event dropped\n");
+}
+
+static irqreturn_t edge_irq_thread(int irq, void *p)
+{
+	struct line *line = p;
+	struct linereq *lr = line->req;
+	struct gpio_v2_line_event le;
+
+	/* Do not leak kernel stack to userspace */
+	memset(&le, 0, sizeof(le));
+
+	if (line->timestamp_ns) {
+		le.timestamp_ns = line->timestamp_ns;
+	} else {
+		/*
+		 * We may be running from a nested threaded interrupt in
+		 * which case we didn't get the timestamp from
+		 * edge_irq_handler().
+		 */
+		le.timestamp_ns = ktime_get_ns();
+		if (lr->num_lines != 1)
+			line->req_seqno = atomic_inc_return(&lr->seqno);
+	}
+	line->timestamp_ns = 0;
+
+	if (line->eflags == (GPIO_V2_LINE_FLAG_EDGE_RISING |
+			     GPIO_V2_LINE_FLAG_EDGE_FALLING)) {
+		int level = gpiod_get_value_cansleep(line->desc);
+
+		if (level)
+			/* Emit low-to-high event */
+			le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
+		else
+			/* Emit high-to-low event */
+			le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
+	} else if (line->eflags == GPIO_V2_LINE_FLAG_EDGE_RISING) {
+		/* Emit low-to-high event */
+		le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
+	} else if (line->eflags == GPIO_V2_LINE_FLAG_EDGE_FALLING) {
+		/* Emit high-to-low event */
+		le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
+	} else {
+		return IRQ_NONE;
+	}
+	line->line_seqno++;
+	le.line_seqno = line->line_seqno;
+	le.seqno = (lr->num_lines == 1) ? le.line_seqno : line->req_seqno;
+	le.offset = gpio_chip_hwgpio(line->desc);
+
+	linereq_put_event(lr, &le);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t edge_irq_handler(int irq, void *p)
+{
+	struct line *line = p;
+	struct linereq *lr = line->req;
+
+	/*
+	 * Just store the timestamp in hardirq context so we get it as
+	 * close in time as possible to the actual event.
+	 */
+	line->timestamp_ns = ktime_get_ns();
+
+	if (lr->num_lines != 1)
+		line->req_seqno = atomic_inc_return(&lr->seqno);
+
+	return IRQ_WAKE_THREAD;
+}
+
+/*
+ * returns the current debounced logical value.
+ */
+static bool debounced_value(struct line *line)
+{
+	bool value;
+
+	/*
+	 * minor race - debouncer may be stopped here, so edge_detector_stop()
+	 * must leave the value unchanged so the following will read the level
+	 * from when the debouncer was last running.
+	 */
+	value = READ_ONCE(line->level);
+
+	if (test_bit(FLAG_ACTIVE_LOW, &line->desc->flags))
+		value = !value;
+
+	return value;
+}
+
+static irqreturn_t debounce_irq_handler(int irq, void *p)
+{
+	struct line *line = p;
+
+	mod_delayed_work(system_wq, &line->work,
+		usecs_to_jiffies(READ_ONCE(line->desc->debounce_period_us)));
+
+	return IRQ_HANDLED;
+}
+
+static void debounce_work_func(struct work_struct *work)
+{
+	struct gpio_v2_line_event le;
+	struct line *line = container_of(work, struct line, work.work);
+	struct linereq *lr;
+	int level;
+
+	level = gpiod_get_raw_value_cansleep(line->desc);
+	if (level < 0) {
+		pr_debug_ratelimited("debouncer failed to read line value\n");
+		return;
+	}
+
+	if (READ_ONCE(line->level) == level)
+		return;
+
+	WRITE_ONCE(line->level, level);
+
+	/* -- edge detection -- */
+	if (!line->eflags)
+		return;
+
+	/* switch from physical level to logical - if they differ */
+	if (test_bit(FLAG_ACTIVE_LOW, &line->desc->flags))
+		level = !level;
+
+	/* ignore edges that are not being monitored */
+	if (((line->eflags == GPIO_V2_LINE_FLAG_EDGE_RISING) && !level) ||
+	    ((line->eflags == GPIO_V2_LINE_FLAG_EDGE_FALLING) && level))
+		return;
+
+	/* Do not leak kernel stack to userspace */
+	memset(&le, 0, sizeof(le));
+
+	lr = line->req;
+	le.timestamp_ns = ktime_get_ns();
+	le.offset = gpio_chip_hwgpio(line->desc);
+	line->line_seqno++;
+	le.line_seqno = line->line_seqno;
+	le.seqno = (lr->num_lines == 1) ?
+		le.line_seqno : atomic_inc_return(&lr->seqno);
+
+	if (level)
+		/* Emit low-to-high event */
+		le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
+	else
+		/* Emit high-to-low event */
+		le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
+
+	linereq_put_event(lr, &le);
+}
+
+static int debounce_setup(struct line *line,
+			  unsigned int debounce_period_us)
+{
+	unsigned long irqflags;
+	int ret, level, irq;
+
+	/* try hardware */
+	ret = gpiod_set_debounce(line->desc, debounce_period_us);
+	if (!ret) {
+		WRITE_ONCE(line->desc->debounce_period_us, debounce_period_us);
+		return ret;
+	}
+	if (ret != -ENOTSUPP)
+		return ret;
+
+	if (debounce_period_us) {
+		/* setup software debounce */
+		level = gpiod_get_raw_value_cansleep(line->desc);
+		if (level < 0)
+			return level;
+
+		irq = gpiod_to_irq(line->desc);
+		if (irq < 0)
+			return -ENXIO;
+
+		WRITE_ONCE(line->level, level);
+		irqflags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
+		ret = request_irq(irq, debounce_irq_handler, irqflags,
+				  line->req->label, line);
+		if (ret)
+			return ret;
+
+		WRITE_ONCE(line->sw_debounced, 1);
+		line->irq = irq;
+	}
+	return 0;
+}
+
+static bool gpio_v2_line_config_debounced(struct gpio_v2_line_config *lc,
+					  unsigned int line_idx)
+{
+	unsigned int i;
+	u64 mask = BIT_ULL(line_idx);
+
+	for (i = 0; i < lc->num_attrs; i++) {
+		if ((lc->attrs[i].attr.id == GPIO_V2_LINE_ATTR_ID_DEBOUNCE) &&
+		    (lc->attrs[i].mask & mask))
+			return true;
+	}
+	return false;
+}
+
+static u32 gpio_v2_line_config_debounce_period(struct gpio_v2_line_config *lc,
+					       unsigned int line_idx)
+{
+	unsigned int i;
+	u64 mask = BIT_ULL(line_idx);
+
+	for (i = 0; i < lc->num_attrs; i++) {
+		if ((lc->attrs[i].attr.id == GPIO_V2_LINE_ATTR_ID_DEBOUNCE) &&
+		    (lc->attrs[i].mask & mask))
+			return lc->attrs[i].attr.debounce_period_us;
+	}
+	return 0;
+}
+
+static void edge_detector_stop(struct line *line)
+{
+	if (line->irq) {
+		free_irq(line->irq, line);
+		line->irq = 0;
+	}
+
+	cancel_delayed_work_sync(&line->work);
+	WRITE_ONCE(line->sw_debounced, 0);
+	line->eflags = 0;
+	/* do not change line->level - see comment in debounced_value() */
+}
+
+static int edge_detector_setup(struct line *line,
+			       struct gpio_v2_line_config *lc,
+			       unsigned int line_idx,
+			       u64 eflags)
+{
+	u32 debounce_period_us;
+	unsigned long irqflags = 0;
+	int irq, ret;
+
+	if (eflags && !kfifo_initialized(&line->req->events)) {
+		ret = kfifo_alloc(&line->req->events,
+				  line->req->event_buffer_size, GFP_KERNEL);
+		if (ret)
+			return ret;
+	}
+	line->eflags = eflags;
+	if (gpio_v2_line_config_debounced(lc, line_idx)) {
+		debounce_period_us = gpio_v2_line_config_debounce_period(lc, line_idx);
+		ret = debounce_setup(line, debounce_period_us);
+		if (ret)
+			return ret;
+		WRITE_ONCE(line->desc->debounce_period_us, debounce_period_us);
+	}
+
+	/* detection disabled or sw debouncer will provide edge detection */
+	if (!eflags || READ_ONCE(line->sw_debounced))
+		return 0;
+
+	irq = gpiod_to_irq(line->desc);
+	if (irq < 0)
+		return -ENXIO;
+
+	if (eflags & GPIO_V2_LINE_FLAG_EDGE_RISING)
+		irqflags |= test_bit(FLAG_ACTIVE_LOW, &line->desc->flags) ?
+			IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
+	if (eflags & GPIO_V2_LINE_FLAG_EDGE_FALLING)
+		irqflags |= test_bit(FLAG_ACTIVE_LOW, &line->desc->flags) ?
+			IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
+	irqflags |= IRQF_ONESHOT;
+
+	/* Request a thread to read the events */
+	ret = request_threaded_irq(irq, edge_irq_handler, edge_irq_thread,
+				   irqflags, line->req->label, line);
+	if (ret)
+		return ret;
+
+	line->irq = irq;
+	return 0;
+}
+
+static int edge_detector_update(struct line *line,
+				struct gpio_v2_line_config *lc,
+				unsigned int line_idx,
+				u64 eflags, bool polarity_change)
+{
+	unsigned int debounce_period_us =
+		gpio_v2_line_config_debounce_period(lc, line_idx);
+
+	if ((line->eflags == eflags) && !polarity_change &&
+	    (READ_ONCE(line->desc->debounce_period_us) == debounce_period_us))
+		return 0;
+
+	/* sw debounced and still will be...*/
+	if (debounce_period_us && READ_ONCE(line->sw_debounced)) {
+		line->eflags = eflags;
+		WRITE_ONCE(line->desc->debounce_period_us, debounce_period_us);
+		return 0;
+	}
+
+	/* reconfiguring edge detection or sw debounce being disabled */
+	if ((line->irq && !READ_ONCE(line->sw_debounced)) ||
+	    (!debounce_period_us && READ_ONCE(line->sw_debounced)))
+		edge_detector_stop(line);
+
+	return edge_detector_setup(line, lc, line_idx, eflags);
+}
+
+static u64 gpio_v2_line_config_flags(struct gpio_v2_line_config *lc,
+				     unsigned int line_idx)
+{
+	unsigned int i;
+	u64 mask = BIT_ULL(line_idx);
+
+	for (i = 0; i < lc->num_attrs; i++) {
+		if ((lc->attrs[i].attr.id == GPIO_V2_LINE_ATTR_ID_FLAGS) &&
+		    (lc->attrs[i].mask & mask))
+			return lc->attrs[i].attr.flags;
+	}
+	return lc->flags;
+}
+
+static int gpio_v2_line_config_output_value(struct gpio_v2_line_config *lc,
+					    unsigned int line_idx)
+{
+	unsigned int i;
+	u64 mask = BIT_ULL(line_idx);
+
+	for (i = 0; i < lc->num_attrs; i++) {
+		if ((lc->attrs[i].attr.id == GPIO_V2_LINE_ATTR_ID_OUTPUT_VALUES) &&
+		    (lc->attrs[i].mask & mask))
+			return !!(lc->attrs[i].attr.values & mask);
+	}
+	return 0;
+}
+
+static int gpio_v2_line_flags_validate(u64 flags)
+{
+	/* Return an error if an unknown flag is set */
+	if (flags & ~GPIO_V2_LINE_VALID_FLAGS)
+		return -EINVAL;
+
+	/*
+	 * Do not allow both INPUT and OUTPUT flags to be set as they are
+	 * contradictory.
+	 */
+	if ((flags & GPIO_V2_LINE_FLAG_INPUT) &&
+	    (flags & GPIO_V2_LINE_FLAG_OUTPUT))
+		return -EINVAL;
+
+	/* Edge detection requires explicit input. */
+	if ((flags & GPIO_V2_LINE_EDGE_FLAGS) &&
+	    !(flags & GPIO_V2_LINE_FLAG_INPUT))
+		return -EINVAL;
+
+	/*
+	 * Do not allow OPEN_SOURCE and OPEN_DRAIN flags in a single
+	 * request. If the hardware actually supports enabling both at the
+	 * same time the electrical result would be disastrous.
+	 */
+	if ((flags & GPIO_V2_LINE_FLAG_OPEN_DRAIN) &&
+	    (flags & GPIO_V2_LINE_FLAG_OPEN_SOURCE))
+		return -EINVAL;
+
+	/* Drive requires explicit output direction. */
+	if ((flags & GPIO_V2_LINE_DRIVE_FLAGS) &&
+	    !(flags & GPIO_V2_LINE_FLAG_OUTPUT))
+		return -EINVAL;
+
+	/* Bias requires explicit direction. */
+	if ((flags & GPIO_V2_LINE_BIAS_FLAGS) &&
+	    !(flags & GPIO_V2_LINE_DIRECTION_FLAGS))
+		return -EINVAL;
+
+	/* Only one bias flag can be set. */
+	if (((flags & GPIO_V2_LINE_FLAG_BIAS_DISABLED) &&
+	     (flags & (GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN |
+		       GPIO_V2_LINE_FLAG_BIAS_PULL_UP))) ||
+	    ((flags & GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN) &&
+	     (flags & GPIO_V2_LINE_FLAG_BIAS_PULL_UP)))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int gpio_v2_line_config_validate(struct gpio_v2_line_config *lc,
+					unsigned int num_lines)
+{
+	unsigned int i;
+	u64 flags;
+	int ret;
+
+	if (lc->num_attrs > GPIO_V2_LINE_NUM_ATTRS_MAX)
+		return -EINVAL;
+
+	if (memchr_inv(lc->padding, 0, sizeof(lc->padding)))
+		return -EINVAL;
+
+	for (i = 0; i < num_lines; i++) {
+		flags = gpio_v2_line_config_flags(lc, i);
+		ret = gpio_v2_line_flags_validate(flags);
+		if (ret)
+			return ret;
+
+		/* debounce requires explicit input */
+		if (gpio_v2_line_config_debounced(lc, i) &&
+		    !(flags & GPIO_V2_LINE_FLAG_INPUT))
+			return -EINVAL;
+	}
+	return 0;
+}
+
+static void gpio_v2_line_config_flags_to_desc_flags(u64 flags,
+						    unsigned long *flagsp)
+{
+	assign_bit(FLAG_ACTIVE_LOW, flagsp,
+		   flags & GPIO_V2_LINE_FLAG_ACTIVE_LOW);
+
+	if (flags & GPIO_V2_LINE_FLAG_OUTPUT)
+		set_bit(FLAG_IS_OUT, flagsp);
+	else if (flags & GPIO_V2_LINE_FLAG_INPUT)
+		clear_bit(FLAG_IS_OUT, flagsp);
+
+	assign_bit(FLAG_EDGE_RISING, flagsp,
+		   flags & GPIO_V2_LINE_FLAG_EDGE_RISING);
+	assign_bit(FLAG_EDGE_FALLING, flagsp,
+		   flags & GPIO_V2_LINE_FLAG_EDGE_FALLING);
+
+	assign_bit(FLAG_OPEN_DRAIN, flagsp,
+		   flags & GPIO_V2_LINE_FLAG_OPEN_DRAIN);
+	assign_bit(FLAG_OPEN_SOURCE, flagsp,
+		   flags & GPIO_V2_LINE_FLAG_OPEN_SOURCE);
+
+	assign_bit(FLAG_PULL_UP, flagsp,
+		   flags & GPIO_V2_LINE_FLAG_BIAS_PULL_UP);
+	assign_bit(FLAG_PULL_DOWN, flagsp,
+		   flags & GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN);
+	assign_bit(FLAG_BIAS_DISABLE, flagsp,
+		   flags & GPIO_V2_LINE_FLAG_BIAS_DISABLED);
+}
+
+static long linereq_get_values(struct linereq *lr, void __user *ip)
+{
+	struct gpio_v2_line_values lv;
+	DECLARE_BITMAP(vals, GPIO_V2_LINES_MAX);
+	struct gpio_desc **descs;
+	unsigned int i, didx, num_get;
+	bool val;
+	int ret;
+
+	/* NOTE: It's ok to read values of output lines. */
+	if (copy_from_user(&lv, ip, sizeof(lv)))
+		return -EFAULT;
+
+	for (num_get = 0, i = 0; i < lr->num_lines; i++) {
+		if (lv.mask & BIT_ULL(i)) {
+			num_get++;
+			descs = &lr->lines[i].desc;
+		}
+	}
+
+	if (num_get == 0)
+		return -EINVAL;
+
+	if (num_get != 1) {
+		descs = kmalloc_array(num_get, sizeof(*descs), GFP_KERNEL);
+		if (!descs)
+			return -ENOMEM;
+		for (didx = 0, i = 0; i < lr->num_lines; i++) {
+			if (lv.mask & BIT_ULL(i)) {
+				descs[didx] = lr->lines[i].desc;
+				didx++;
+			}
+		}
+	}
+	ret = gpiod_get_array_value_complex(false, true, num_get,
+					    descs, NULL, vals);
+
+	if (num_get != 1)
+		kfree(descs);
+	if (ret)
+		return ret;
+
+	lv.bits = 0;
+	for (didx = 0, i = 0; i < lr->num_lines; i++) {
+		if (lv.mask & BIT_ULL(i)) {
+			if (lr->lines[i].sw_debounced)
+				val = debounced_value(&lr->lines[i]);
+			else
+				val = test_bit(didx, vals);
+			if (val)
+				lv.bits |= BIT_ULL(i);
+			didx++;
+		}
+	}
+
+	if (copy_to_user(ip, &lv, sizeof(lv)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static long linereq_set_values_unlocked(struct linereq *lr,
+					struct gpio_v2_line_values *lv)
+{
+	DECLARE_BITMAP(vals, GPIO_V2_LINES_MAX);
+	struct gpio_desc **descs;
+	unsigned int i, didx, num_set;
+	int ret;
+
+	bitmap_zero(vals, GPIO_V2_LINES_MAX);
+	for (num_set = 0, i = 0; i < lr->num_lines; i++) {
+		if (lv->mask & BIT_ULL(i)) {
+			if (!test_bit(FLAG_IS_OUT, &lr->lines[i].desc->flags))
+				return -EPERM;
+			if (lv->bits & BIT_ULL(i))
+				__set_bit(num_set, vals);
+			num_set++;
+			descs = &lr->lines[i].desc;
+		}
+	}
+	if (num_set == 0)
+		return -EINVAL;
+
+	if (num_set != 1) {
+		/* build compacted desc array and values */
+		descs = kmalloc_array(num_set, sizeof(*descs), GFP_KERNEL);
+		if (!descs)
+			return -ENOMEM;
+		for (didx = 0, i = 0; i < lr->num_lines; i++) {
+			if (lv->mask & BIT_ULL(i)) {
+				descs[didx] = lr->lines[i].desc;
+				didx++;
+			}
+		}
+	}
+	ret = gpiod_set_array_value_complex(false, true, num_set,
+					    descs, NULL, vals);
+
+	if (num_set != 1)
+		kfree(descs);
+	return ret;
+}
+
+static long linereq_set_values(struct linereq *lr, void __user *ip)
+{
+	struct gpio_v2_line_values lv;
+	int ret;
+
+	if (copy_from_user(&lv, ip, sizeof(lv)))
+		return -EFAULT;
+
+	mutex_lock(&lr->config_mutex);
+
+	ret = linereq_set_values_unlocked(lr, &lv);
+
+	mutex_unlock(&lr->config_mutex);
+
+	return ret;
+}
+
+static long linereq_set_config_unlocked(struct linereq *lr,
+					struct gpio_v2_line_config *lc)
+{
+	struct gpio_desc *desc;
+	unsigned int i;
+	u64 flags;
+	bool polarity_change;
+	int ret;
+
+	for (i = 0; i < lr->num_lines; i++) {
+		desc = lr->lines[i].desc;
+		flags = gpio_v2_line_config_flags(lc, i);
+		polarity_change =
+			(!!test_bit(FLAG_ACTIVE_LOW, &desc->flags) !=
+			 ((flags & GPIO_V2_LINE_FLAG_ACTIVE_LOW) != 0));
+
+		gpio_v2_line_config_flags_to_desc_flags(flags, &desc->flags);
+		/*
+		 * Lines have to be requested explicitly for input
+		 * or output, else the line will be treated "as is".
+		 */
+		if (flags & GPIO_V2_LINE_FLAG_OUTPUT) {
+			int val = gpio_v2_line_config_output_value(lc, i);
+
+			edge_detector_stop(&lr->lines[i]);
+			ret = gpiod_direction_output(desc, val);
+			if (ret)
+				return ret;
+		} else if (flags & GPIO_V2_LINE_FLAG_INPUT) {
+			ret = gpiod_direction_input(desc);
+			if (ret)
+				return ret;
+
+			ret = edge_detector_update(&lr->lines[i], lc, i,
+					flags & GPIO_V2_LINE_EDGE_FLAGS,
+					polarity_change);
+			if (ret)
+				return ret;
+		}
+
+		blocking_notifier_call_chain(&desc->gdev->notifier,
+					     GPIO_V2_LINE_CHANGED_CONFIG,
+					     desc);
+	}
+	return 0;
+}
+
+static long linereq_set_config(struct linereq *lr, void __user *ip)
+{
+	struct gpio_v2_line_config lc;
+	int ret;
+
+	if (copy_from_user(&lc, ip, sizeof(lc)))
+		return -EFAULT;
+
+	ret = gpio_v2_line_config_validate(&lc, lr->num_lines);
+	if (ret)
+		return ret;
+
+	mutex_lock(&lr->config_mutex);
+
+	ret = linereq_set_config_unlocked(lr, &lc);
+
+	mutex_unlock(&lr->config_mutex);
+
+	return ret;
+}
+
+static long linereq_ioctl(struct file *file, unsigned int cmd,
+			  unsigned long arg)
+{
+	struct linereq *lr = file->private_data;
+	void __user *ip = (void __user *)arg;
+
+	if (cmd == GPIO_V2_LINE_GET_VALUES_IOCTL)
+		return linereq_get_values(lr, ip);
+	else if (cmd == GPIO_V2_LINE_SET_VALUES_IOCTL)
+		return linereq_set_values(lr, ip);
+	else if (cmd == GPIO_V2_LINE_SET_CONFIG_IOCTL)
+		return linereq_set_config(lr, ip);
+
+	return -EINVAL;
+}
+
+#ifdef CONFIG_COMPAT
+static long linereq_ioctl_compat(struct file *file, unsigned int cmd,
+				 unsigned long arg)
+{
+	return linereq_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+static __poll_t linereq_poll(struct file *file,
+			    struct poll_table_struct *wait)
+{
+	struct linereq *lr = file->private_data;
+	__poll_t events = 0;
+
+	poll_wait(file, &lr->wait, wait);
+
+	if (!kfifo_is_empty_spinlocked_noirqsave(&lr->events,
+						 &lr->wait.lock))
+		events = EPOLLIN | EPOLLRDNORM;
+
+	return events;
+}
+
+static ssize_t linereq_read(struct file *file,
+			    char __user *buf,
+			    size_t count,
+			    loff_t *f_ps)
+{
+	struct linereq *lr = file->private_data;
+	struct gpio_v2_line_event le;
+	ssize_t bytes_read = 0;
+	int ret;
+
+	if (count < sizeof(le))
+		return -EINVAL;
+
+	do {
+		spin_lock(&lr->wait.lock);
+		if (kfifo_is_empty(&lr->events)) {
+			if (bytes_read) {
+				spin_unlock(&lr->wait.lock);
+				return bytes_read;
+			}
+
+			if (file->f_flags & O_NONBLOCK) {
+				spin_unlock(&lr->wait.lock);
+				return -EAGAIN;
+			}
+
+			ret = wait_event_interruptible_locked(lr->wait,
+					!kfifo_is_empty(&lr->events));
+			if (ret) {
+				spin_unlock(&lr->wait.lock);
+				return ret;
+			}
+		}
+
+		ret = kfifo_out(&lr->events, &le, 1);
+		spin_unlock(&lr->wait.lock);
+		if (ret != 1) {
+			/*
+			 * This should never happen - we were holding the
+			 * lock from the moment we learned the fifo is no
+			 * longer empty until now.
+			 */
+			ret = -EIO;
+			break;
+		}
+
+		if (copy_to_user(buf + bytes_read, &le, sizeof(le)))
+			return -EFAULT;
+		bytes_read += sizeof(le);
+	} while (count >= bytes_read + sizeof(le));
+
+	return bytes_read;
+}
+
+static void linereq_free(struct linereq *lr)
+{
+	unsigned int i;
+
+	for (i = 0; i < lr->num_lines; i++) {
+		edge_detector_stop(&lr->lines[i]);
+		if (lr->lines[i].desc)
+			gpiod_free(lr->lines[i].desc);
+	}
+	kfifo_free(&lr->events);
+	kfree(lr->label);
+	put_device(&lr->gdev->dev);
+	kfree(lr);
+}
+
+static int linereq_release(struct inode *inode, struct file *file)
+{
+	struct linereq *lr = file->private_data;
+
+	linereq_free(lr);
+	return 0;
+}
+
+static const struct file_operations line_fileops = {
+	.release = linereq_release,
+	.read = linereq_read,
+	.poll = linereq_poll,
+	.owner = THIS_MODULE,
+	.llseek = noop_llseek,
+	.unlocked_ioctl = linereq_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = linereq_ioctl_compat,
+#endif
+};
+
+static int linereq_create(struct gpio_device *gdev, void __user *ip)
+{
+	struct gpio_v2_line_request ulr;
+	struct gpio_v2_line_config *lc;
+	struct linereq *lr;
+	struct file *file;
+	u64 flags;
+	unsigned int i;
+	int fd, ret;
+
+	if (copy_from_user(&ulr, ip, sizeof(ulr)))
+		return -EFAULT;
+
+	if ((ulr.num_lines == 0) || (ulr.num_lines > GPIO_V2_LINES_MAX))
+		return -EINVAL;
+
+	if (memchr_inv(ulr.padding, 0, sizeof(ulr.padding)))
+		return -EINVAL;
+
+	lc = &ulr.config;
+	ret = gpio_v2_line_config_validate(lc, ulr.num_lines);
+	if (ret)
+		return ret;
+
+	lr = kzalloc(struct_size(lr, lines, ulr.num_lines), GFP_KERNEL);
+	if (!lr)
+		return -ENOMEM;
+
+	lr->gdev = gdev;
+	get_device(&gdev->dev);
+
+	for (i = 0; i < ulr.num_lines; i++) {
+		lr->lines[i].req = lr;
+		WRITE_ONCE(lr->lines[i].sw_debounced, 0);
+		INIT_DELAYED_WORK(&lr->lines[i].work, debounce_work_func);
+	}
+
+	if (ulr.consumer[0] != '\0') {
+		/* label is only initialized if consumer is set */
+		lr->label = kstrndup(ulr.consumer, sizeof(ulr.consumer) - 1,
+				     GFP_KERNEL);
+		if (!lr->label) {
+			ret = -ENOMEM;
+			goto out_free_linereq;
+		}
+	}
+
+	mutex_init(&lr->config_mutex);
+	init_waitqueue_head(&lr->wait);
+	lr->event_buffer_size = ulr.event_buffer_size;
+	if (lr->event_buffer_size == 0)
+		lr->event_buffer_size = ulr.num_lines * 16;
+	else if (lr->event_buffer_size > GPIO_V2_LINES_MAX * 16)
+		lr->event_buffer_size = GPIO_V2_LINES_MAX * 16;
+
+	atomic_set(&lr->seqno, 0);
+	lr->num_lines = ulr.num_lines;
+
+	/* Request each GPIO */
+	for (i = 0; i < ulr.num_lines; i++) {
+		u32 offset = ulr.offsets[i];
+		struct gpio_desc *desc = gpiochip_get_desc(gdev->chip, offset);
+
+		if (IS_ERR(desc)) {
+			ret = PTR_ERR(desc);
+			goto out_free_linereq;
+		}
+
+		ret = gpiod_request(desc, lr->label);
+		if (ret)
+			goto out_free_linereq;
+
+		lr->lines[i].desc = desc;
+		flags = gpio_v2_line_config_flags(lc, i);
+		gpio_v2_line_config_flags_to_desc_flags(flags, &desc->flags);
+
+		ret = gpiod_set_transitory(desc, false);
+		if (ret < 0)
+			goto out_free_linereq;
+
+		/*
+		 * Lines have to be requested explicitly for input
+		 * or output, else the line will be treated "as is".
+		 */
+		if (flags & GPIO_V2_LINE_FLAG_OUTPUT) {
+			int val = gpio_v2_line_config_output_value(lc, i);
+
+			ret = gpiod_direction_output(desc, val);
+			if (ret)
+				goto out_free_linereq;
+		} else if (flags & GPIO_V2_LINE_FLAG_INPUT) {
+			ret = gpiod_direction_input(desc);
+			if (ret)
+				goto out_free_linereq;
+
+			ret = edge_detector_setup(&lr->lines[i], lc, i,
+					flags & GPIO_V2_LINE_EDGE_FLAGS);
+			if (ret)
+				goto out_free_linereq;
+		}
+
+		blocking_notifier_call_chain(&desc->gdev->notifier,
+					     GPIO_V2_LINE_CHANGED_REQUESTED, desc);
+
+		dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
+			offset);
+	}
+
+	fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
+	if (fd < 0) {
+		ret = fd;
+		goto out_free_linereq;
+	}
+
+	file = anon_inode_getfile("gpio-line", &line_fileops, lr,
+				  O_RDONLY | O_CLOEXEC);
+	if (IS_ERR(file)) {
+		ret = PTR_ERR(file);
+		goto out_put_unused_fd;
+	}
+
+	ulr.fd = fd;
+	if (copy_to_user(ip, &ulr, sizeof(ulr))) {
+		/*
+		 * fput() will trigger the release() callback, so do not go onto
+		 * the regular error cleanup path here.
+		 */
+		fput(file);
+		put_unused_fd(fd);
+		return -EFAULT;
+	}
+
+	fd_install(fd, file);
+
+	dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n",
+		lr->num_lines);
+
+	return 0;
+
+out_put_unused_fd:
+	put_unused_fd(fd);
+out_free_linereq:
+	linereq_free(lr);
+	return ret;
+}
+
+#ifdef CONFIG_GPIO_CDEV_V1
 
 /*
  * GPIO line event management
@@ -680,11 +1736,11 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip)
 	le->gdev = gdev;
 	get_device(&gdev->dev);
 
-	/* Make sure this is terminated */
-	eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0';
-	if (strlen(eventreq.consumer_label)) {
-		le->label = kstrdup(eventreq.consumer_label,
-				    GFP_KERNEL);
+	if (eventreq.consumer_label[0] != '\0') {
+		/* label is only initialized if consumer_label is set */
+		le->label = kstrndup(eventreq.consumer_label,
+				     sizeof(eventreq.consumer_label) - 1,
+				     GFP_KERNEL);
 		if (!le->label) {
 			ret = -ENOMEM;
 			goto out_free_le;
@@ -704,7 +1760,7 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip)
 		goto out_free_le;
 
 	blocking_notifier_call_chain(&desc->gdev->notifier,
-				     GPIOLINE_CHANGED_REQUESTED, desc);
+				     GPIO_V2_LINE_CHANGED_REQUESTED, desc);
 
 	irq = gpiod_to_irq(desc);
 	if (irq <= 0) {
@@ -771,12 +1827,60 @@ out_free_le:
 	return ret;
 }
 
+static void gpio_v2_line_info_to_v1(struct gpio_v2_line_info *info_v2,
+				    struct gpioline_info *info_v1)
+{
+	u64 flagsv2 = info_v2->flags;
+
+	memcpy(info_v1->name, info_v2->name, sizeof(info_v1->name));
+	memcpy(info_v1->consumer, info_v2->consumer, sizeof(info_v1->consumer));
+	info_v1->line_offset = info_v2->offset;
+	info_v1->flags = 0;
+
+	if (flagsv2 & GPIO_V2_LINE_FLAG_USED)
+		info_v1->flags |= GPIOLINE_FLAG_KERNEL;
+
+	if (flagsv2 & GPIO_V2_LINE_FLAG_OUTPUT)
+		info_v1->flags |= GPIOLINE_FLAG_IS_OUT;
+
+	if (flagsv2 & GPIO_V2_LINE_FLAG_ACTIVE_LOW)
+		info_v1->flags |= GPIOLINE_FLAG_ACTIVE_LOW;
+
+	if (flagsv2 & GPIO_V2_LINE_FLAG_OPEN_DRAIN)
+		info_v1->flags |= GPIOLINE_FLAG_OPEN_DRAIN;
+	if (flagsv2 & GPIO_V2_LINE_FLAG_OPEN_SOURCE)
+		info_v1->flags |= GPIOLINE_FLAG_OPEN_SOURCE;
+
+	if (flagsv2 & GPIO_V2_LINE_FLAG_BIAS_PULL_UP)
+		info_v1->flags |= GPIOLINE_FLAG_BIAS_PULL_UP;
+	if (flagsv2 & GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN)
+		info_v1->flags |= GPIOLINE_FLAG_BIAS_PULL_DOWN;
+	if (flagsv2 & GPIO_V2_LINE_FLAG_BIAS_DISABLED)
+		info_v1->flags |= GPIOLINE_FLAG_BIAS_DISABLE;
+}
+
+static void gpio_v2_line_info_changed_to_v1(
+		struct gpio_v2_line_info_changed *lic_v2,
+		struct gpioline_info_changed *lic_v1)
+{
+	gpio_v2_line_info_to_v1(&lic_v2->info, &lic_v1->info);
+	lic_v1->timestamp = lic_v2->timestamp_ns;
+	lic_v1->event_type = lic_v2->event_type;
+}
+
+#endif /* CONFIG_GPIO_CDEV_V1 */
+
 static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
-				  struct gpioline_info *info)
+				  struct gpio_v2_line_info *info)
 {
 	struct gpio_chip *gc = desc->gdev->chip;
 	bool ok_for_pinctrl;
 	unsigned long flags;
+	u32 debounce_period_us;
+	unsigned int num_attrs = 0;
+
+	memset(info, 0, sizeof(*info));
+	info->offset = gpio_chip_hwgpio(desc);
 
 	/*
 	 * This function takes a mutex so we must check this before taking
@@ -786,23 +1890,15 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
 	 * lock common to both frameworks?
 	 */
 	ok_for_pinctrl =
-		pinctrl_gpio_can_use_line(gc->base + info->line_offset);
+		pinctrl_gpio_can_use_line(gc->base + info->offset);
 
 	spin_lock_irqsave(&gpio_lock, flags);
 
-	if (desc->name) {
-		strncpy(info->name, desc->name, sizeof(info->name));
-		info->name[sizeof(info->name) - 1] = '\0';
-	} else {
-		info->name[0] = '\0';
-	}
+	if (desc->name)
+		strscpy(info->name, desc->name, sizeof(info->name));
 
-	if (desc->label) {
-		strncpy(info->consumer, desc->label, sizeof(info->consumer));
-		info->consumer[sizeof(info->consumer) - 1] = '\0';
-	} else {
-		info->consumer[0] = '\0';
-	}
+	if (desc->label)
+		strscpy(info->consumer, desc->label, sizeof(info->consumer));
 
 	/*
 	 * Userspace only need to know that the kernel is using this GPIO so
@@ -815,23 +1911,40 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
 	    test_bit(FLAG_EXPORT, &desc->flags) ||
 	    test_bit(FLAG_SYSFS, &desc->flags) ||
 	    !ok_for_pinctrl)
-		info->flags |= GPIOLINE_FLAG_KERNEL;
+		info->flags |= GPIO_V2_LINE_FLAG_USED;
+
 	if (test_bit(FLAG_IS_OUT, &desc->flags))
-		info->flags |= GPIOLINE_FLAG_IS_OUT;
+		info->flags |= GPIO_V2_LINE_FLAG_OUTPUT;
+	else
+		info->flags |= GPIO_V2_LINE_FLAG_INPUT;
+
 	if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
-		info->flags |= GPIOLINE_FLAG_ACTIVE_LOW;
+		info->flags |= GPIO_V2_LINE_FLAG_ACTIVE_LOW;
+
 	if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
-		info->flags |= (GPIOLINE_FLAG_OPEN_DRAIN |
-				GPIOLINE_FLAG_IS_OUT);
+		info->flags |= GPIO_V2_LINE_FLAG_OPEN_DRAIN;
 	if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
-		info->flags |= (GPIOLINE_FLAG_OPEN_SOURCE |
-				GPIOLINE_FLAG_IS_OUT);
+		info->flags |= GPIO_V2_LINE_FLAG_OPEN_SOURCE;
+
 	if (test_bit(FLAG_BIAS_DISABLE, &desc->flags))
-		info->flags |= GPIOLINE_FLAG_BIAS_DISABLE;
+		info->flags |= GPIO_V2_LINE_FLAG_BIAS_DISABLED;
 	if (test_bit(FLAG_PULL_DOWN, &desc->flags))
-		info->flags |= GPIOLINE_FLAG_BIAS_PULL_DOWN;
+		info->flags |= GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN;
 	if (test_bit(FLAG_PULL_UP, &desc->flags))
-		info->flags |= GPIOLINE_FLAG_BIAS_PULL_UP;
+		info->flags |= GPIO_V2_LINE_FLAG_BIAS_PULL_UP;
+
+	if (test_bit(FLAG_EDGE_RISING, &desc->flags))
+		info->flags |= GPIO_V2_LINE_FLAG_EDGE_RISING;
+	if (test_bit(FLAG_EDGE_FALLING, &desc->flags))
+		info->flags |= GPIO_V2_LINE_FLAG_EDGE_FALLING;
+
+	debounce_period_us = READ_ONCE(desc->debounce_period_us);
+	if (debounce_period_us) {
+		info->attrs[num_attrs].id = GPIO_V2_LINE_ATTR_ID_DEBOUNCE;
+		info->attrs[num_attrs].debounce_period_us = debounce_period_us;
+		num_attrs++;
+	}
+	info->num_attrs = num_attrs;
 
 	spin_unlock_irqrestore(&gpio_lock, flags);
 }
@@ -839,11 +1952,65 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
 struct gpio_chardev_data {
 	struct gpio_device *gdev;
 	wait_queue_head_t wait;
-	DECLARE_KFIFO(events, struct gpioline_info_changed, 32);
+	DECLARE_KFIFO(events, struct gpio_v2_line_info_changed, 32);
 	struct notifier_block lineinfo_changed_nb;
 	unsigned long *watched_lines;
+#ifdef CONFIG_GPIO_CDEV_V1
+	atomic_t watch_abi_version;
+#endif
 };
 
+#ifdef CONFIG_GPIO_CDEV_V1
+/*
+ * returns 0 if the versions match, else the previously selected ABI version
+ */
+static int lineinfo_ensure_abi_version(struct gpio_chardev_data *cdata,
+				       unsigned int version)
+{
+	int abiv = atomic_cmpxchg(&cdata->watch_abi_version, 0, version);
+
+	if (abiv == version)
+		return 0;
+
+	return abiv;
+}
+#endif
+
+static int lineinfo_get(struct gpio_chardev_data *cdev, void __user *ip,
+			bool watch)
+{
+	struct gpio_desc *desc;
+	struct gpio_v2_line_info lineinfo;
+
+	if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
+		return -EFAULT;
+
+	if (memchr_inv(lineinfo.padding, 0, sizeof(lineinfo.padding)))
+		return -EINVAL;
+
+	desc = gpiochip_get_desc(cdev->gdev->chip, lineinfo.offset);
+	if (IS_ERR(desc))
+		return PTR_ERR(desc);
+
+	if (watch) {
+#ifdef CONFIG_GPIO_CDEV_V1
+		if (lineinfo_ensure_abi_version(cdev, 2))
+			return -EPERM;
+#endif
+		if (test_and_set_bit(lineinfo.offset, cdev->watched_lines))
+			return -EBUSY;
+	}
+	gpio_desc_to_lineinfo(desc, &lineinfo);
+
+	if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) {
+		if (watch)
+			clear_bit(lineinfo.offset, cdev->watched_lines);
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
 /*
  * gpio_ioctl() - ioctl handler for the GPIO chardev
  */
@@ -853,7 +2020,6 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	struct gpio_device *gdev = cdev->gdev;
 	struct gpio_chip *gc = gdev->chip;
 	void __user *ip = (void __user *)arg;
-	struct gpio_desc *desc;
 	__u32 offset;
 
 	/* We fail any subsequent ioctl():s when the chip is gone */
@@ -866,18 +2032,19 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 		memset(&chipinfo, 0, sizeof(chipinfo));
 
-		strncpy(chipinfo.name, dev_name(&gdev->dev),
+		strscpy(chipinfo.name, dev_name(&gdev->dev),
 			sizeof(chipinfo.name));
-		chipinfo.name[sizeof(chipinfo.name)-1] = '\0';
-		strncpy(chipinfo.label, gdev->label,
+		strscpy(chipinfo.label, gdev->label,
 			sizeof(chipinfo.label));
-		chipinfo.label[sizeof(chipinfo.label)-1] = '\0';
 		chipinfo.lines = gdev->ngpio;
 		if (copy_to_user(ip, &chipinfo, sizeof(chipinfo)))
 			return -EFAULT;
 		return 0;
+#ifdef CONFIG_GPIO_CDEV_V1
 	} else if (cmd == GPIO_GET_LINEINFO_IOCTL) {
+		struct gpio_desc *desc;
 		struct gpioline_info lineinfo;
+		struct gpio_v2_line_info lineinfo_v2;
 
 		if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
 			return -EFAULT;
@@ -887,7 +2054,8 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		if (IS_ERR(desc))
 			return PTR_ERR(desc);
 
-		gpio_desc_to_lineinfo(desc, &lineinfo);
+		gpio_desc_to_lineinfo(desc, &lineinfo_v2);
+		gpio_v2_line_info_to_v1(&lineinfo_v2, &lineinfo);
 
 		if (copy_to_user(ip, &lineinfo, sizeof(lineinfo)))
 			return -EFAULT;
@@ -897,7 +2065,9 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	} else if (cmd == GPIO_GET_LINEEVENT_IOCTL) {
 		return lineevent_create(gdev, ip);
 	} else if (cmd == GPIO_GET_LINEINFO_WATCH_IOCTL) {
+		struct gpio_desc *desc;
 		struct gpioline_info lineinfo;
+		struct gpio_v2_line_info lineinfo_v2;
 
 		if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
 			return -EFAULT;
@@ -907,10 +2077,14 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		if (IS_ERR(desc))
 			return PTR_ERR(desc);
 
+		if (lineinfo_ensure_abi_version(cdev, 1))
+			return -EPERM;
+
 		if (test_and_set_bit(lineinfo.line_offset, cdev->watched_lines))
 			return -EBUSY;
 
-		gpio_desc_to_lineinfo(desc, &lineinfo);
+		gpio_desc_to_lineinfo(desc, &lineinfo_v2);
+		gpio_v2_line_info_to_v1(&lineinfo_v2, &lineinfo);
 
 		if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) {
 			clear_bit(lineinfo.line_offset, cdev->watched_lines);
@@ -918,6 +2092,13 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		}
 
 		return 0;
+#endif /* CONFIG_GPIO_CDEV_V1 */
+	} else if (cmd == GPIO_V2_GET_LINEINFO_IOCTL ||
+		   cmd == GPIO_V2_GET_LINEINFO_WATCH_IOCTL) {
+		return lineinfo_get(cdev, ip,
+				    cmd == GPIO_V2_GET_LINEINFO_WATCH_IOCTL);
+	} else if (cmd == GPIO_V2_GET_LINE_IOCTL) {
+		return linereq_create(gdev, ip);
 	} else if (cmd == GPIO_GET_LINEINFO_UNWATCH_IOCTL) {
 		if (copy_from_user(&offset, ip, sizeof(offset)))
 			return -EFAULT;
@@ -951,7 +2132,7 @@ static int lineinfo_changed_notify(struct notifier_block *nb,
 				   unsigned long action, void *data)
 {
 	struct gpio_chardev_data *cdev = to_gpio_chardev_data(nb);
-	struct gpioline_info_changed chg;
+	struct gpio_v2_line_info_changed chg;
 	struct gpio_desc *desc = data;
 	int ret;
 
@@ -959,9 +2140,8 @@ static int lineinfo_changed_notify(struct notifier_block *nb,
 		return NOTIFY_DONE;
 
 	memset(&chg, 0, sizeof(chg));
-	chg.info.line_offset = gpio_chip_hwgpio(desc);
 	chg.event_type = action;
-	chg.timestamp = ktime_get_ns();
+	chg.timestamp_ns = ktime_get_ns();
 	gpio_desc_to_lineinfo(desc, &chg.info);
 
 	ret = kfifo_in_spinlocked(&cdev->events, &chg, 1, &cdev->wait.lock);
@@ -992,12 +2172,16 @@ static ssize_t lineinfo_watch_read(struct file *file, char __user *buf,
 				   size_t count, loff_t *off)
 {
 	struct gpio_chardev_data *cdev = file->private_data;
-	struct gpioline_info_changed event;
+	struct gpio_v2_line_info_changed event;
 	ssize_t bytes_read = 0;
 	int ret;
+	size_t event_size;
 
-	if (count < sizeof(event))
+#ifndef CONFIG_GPIO_CDEV_V1
+	event_size = sizeof(struct gpio_v2_line_info_changed);
+	if (count < event_size)
 		return -EINVAL;
+#endif
 
 	do {
 		spin_lock(&cdev->wait.lock);
@@ -1019,7 +2203,17 @@ static ssize_t lineinfo_watch_read(struct file *file, char __user *buf,
 				return ret;
 			}
 		}
-
+#ifdef CONFIG_GPIO_CDEV_V1
+		/* must be after kfifo check so watch_abi_version is set */
+		if (atomic_read(&cdev->watch_abi_version) == 2)
+			event_size = sizeof(struct gpio_v2_line_info_changed);
+		else
+			event_size = sizeof(struct gpioline_info_changed);
+		if (count < event_size) {
+			spin_unlock(&cdev->wait.lock);
+			return -EINVAL;
+		}
+#endif
 		ret = kfifo_out(&cdev->events, &event, 1);
 		spin_unlock(&cdev->wait.lock);
 		if (ret != 1) {
@@ -1028,9 +2222,23 @@ static ssize_t lineinfo_watch_read(struct file *file, char __user *buf,
 			/* We should never get here. See lineevent_read(). */
 		}
 
-		if (copy_to_user(buf + bytes_read, &event, sizeof(event)))
+#ifdef CONFIG_GPIO_CDEV_V1
+		if (event_size == sizeof(struct gpio_v2_line_info_changed)) {
+			if (copy_to_user(buf + bytes_read, &event, event_size))
+				return -EFAULT;
+		} else {
+			struct gpioline_info_changed event_v1;
+
+			gpio_v2_line_info_changed_to_v1(&event, &event_v1);
+			if (copy_to_user(buf + bytes_read, &event_v1,
+					 event_size))
+				return -EFAULT;
+		}
+#else
+		if (copy_to_user(buf + bytes_read, &event, event_size))
 			return -EFAULT;
-		bytes_read += sizeof(event);
+#endif
+		bytes_read += event_size;
 	} while (count >= bytes_read + sizeof(event));
 
 	return bytes_read;
diff --git a/drivers/gpio/gpiolib-cdev.h b/drivers/gpio/gpiolib-cdev.h
index 973578e7ad10..cb41dd757338 100644
--- a/drivers/gpio/gpiolib-cdev.h
+++ b/drivers/gpio/gpiolib-cdev.h
@@ -3,9 +3,26 @@
 #ifndef GPIOLIB_CDEV_H
 #define GPIOLIB_CDEV_H
 
-#include <linux/device.h>
+#include <linux/types.h>
+
+struct gpio_device;
+
+#ifdef CONFIG_GPIO_CDEV
 
 int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt);
 void gpiolib_cdev_unregister(struct gpio_device *gdev);
 
+#else
+
+static inline int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt)
+{
+	return 0;
+}
+
+static inline void gpiolib_cdev_unregister(struct gpio_device *gdev)
+{
+}
+
+#endif /* CONFIG_GPIO_CDEV */
+
 #endif /* GPIOLIB_CDEV_H */
diff --git a/drivers/gpio/gpiolib-devprop.c b/drivers/gpio/gpiolib-devprop.c
deleted file mode 100644
index 26741032fa9e..000000000000
--- a/drivers/gpio/gpiolib-devprop.c
+++ /dev/null
@@ -1,63 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Device property helpers for GPIO chips.
- *
- * Copyright (C) 2016, Intel Corporation
- * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
- */
-
-#include <linux/property.h>
-#include <linux/slab.h>
-#include <linux/gpio/consumer.h>
-#include <linux/gpio/driver.h>
-#include <linux/export.h>
-
-#include "gpiolib.h"
-
-/**
- * devprop_gpiochip_set_names - Set GPIO line names using device properties
- * @chip: GPIO chip whose lines should be named, if possible
- * @fwnode: Property Node containing the gpio-line-names property
- *
- * Looks for device property "gpio-line-names" and if it exists assigns
- * GPIO line names for the chip. The memory allocated for the assigned
- * names belong to the underlying firmware node and should not be released
- * by the caller.
- */
-void devprop_gpiochip_set_names(struct gpio_chip *chip,
-				const struct fwnode_handle *fwnode)
-{
-	struct gpio_device *gdev = chip->gpiodev;
-	const char **names;
-	int ret, i;
-	int count;
-
-	count = fwnode_property_read_string_array(fwnode, "gpio-line-names",
-						  NULL, 0);
-	if (count < 0)
-		return;
-
-	if (count > gdev->ngpio) {
-		dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d",
-			 count, gdev->ngpio);
-		count = gdev->ngpio;
-	}
-
-	names = kcalloc(count, sizeof(*names), GFP_KERNEL);
-	if (!names)
-		return;
-
-	ret = fwnode_property_read_string_array(fwnode, "gpio-line-names",
-						names, count);
-	if (ret < 0) {
-		dev_warn(&gdev->dev, "failed to read GPIO line names\n");
-		kfree(names);
-		return;
-	}
-
-	for (i = 0; i < count; i++)
-		gdev->descs[i].name = names[i];
-
-	kfree(names);
-}
-EXPORT_SYMBOL_GPL(devprop_gpiochip_set_names);
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index bd31dd3b6a75..2f895a2b8411 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -1026,11 +1026,6 @@ int of_gpiochip_add(struct gpio_chip *chip)
 	if (ret)
 		return ret;
 
-	/* If the chip defines names itself, these take precedence */
-	if (!chip->names)
-		devprop_gpiochip_set_names(chip,
-					   of_fwnode_handle(chip->of_node));
-
 	of_node_get(chip->of_node);
 
 	ret = of_gpiochip_scan_gpios(chip);
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 80137c1b3cdc..3cdf9effc13a 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -340,9 +340,6 @@ static int gpiochip_set_desc_names(struct gpio_chip *gc)
 	struct gpio_device *gdev = gc->gpiodev;
 	int i;
 
-	if (!gc->names)
-		return 0;
-
 	/* First check all names if they are unique */
 	for (i = 0; i != gc->ngpio; ++i) {
 		struct gpio_desc *gpio;
@@ -361,6 +358,57 @@ static int gpiochip_set_desc_names(struct gpio_chip *gc)
 	return 0;
 }
 
+/*
+ * devprop_gpiochip_set_names - Set GPIO line names using device properties
+ * @chip: GPIO chip whose lines should be named, if possible
+ *
+ * Looks for device property "gpio-line-names" and if it exists assigns
+ * GPIO line names for the chip. The memory allocated for the assigned
+ * names belong to the underlying software node and should not be released
+ * by the caller.
+ */
+static int devprop_gpiochip_set_names(struct gpio_chip *chip)
+{
+	struct gpio_device *gdev = chip->gpiodev;
+	struct device *dev = chip->parent;
+	const char **names;
+	int ret, i;
+	int count;
+
+	/* GPIO chip may not have a parent device whose properties we inspect. */
+	if (!dev)
+		return 0;
+
+	count = device_property_string_array_count(dev, "gpio-line-names");
+	if (count < 0)
+		return 0;
+
+	if (count > gdev->ngpio) {
+		dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d",
+			 count, gdev->ngpio);
+		count = gdev->ngpio;
+	}
+
+	names = kcalloc(count, sizeof(*names), GFP_KERNEL);
+	if (!names)
+		return -ENOMEM;
+
+	ret = device_property_read_string_array(dev, "gpio-line-names",
+						names, count);
+	if (ret < 0) {
+		dev_warn(&gdev->dev, "failed to read GPIO line names\n");
+		kfree(names);
+		return ret;
+	}
+
+	for (i = 0; i < count; i++)
+		gdev->descs[i].name = names[i];
+
+	kfree(names);
+
+	return 0;
+}
+
 static unsigned long *gpiochip_allocate_mask(struct gpio_chip *gc)
 {
 	unsigned long *p;
@@ -426,7 +474,7 @@ static void gpiodevice_release(struct device *dev)
 	struct gpio_device *gdev = dev_get_drvdata(dev);
 
 	list_del(&gdev->list);
-	ida_simple_remove(&gpio_ida, gdev->id);
+	ida_free(&gpio_ida, gdev->id);
 	kfree_const(gdev->label);
 	kfree(gdev->descs);
 	kfree(gdev);
@@ -537,7 +585,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 		gc->of_node = gdev->dev.of_node;
 #endif
 
-	gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL);
+	gdev->id = ida_alloc(&gpio_ida, GFP_KERNEL);
 	if (gdev->id < 0) {
 		ret = gdev->id;
 		goto err_free_gdev;
@@ -621,7 +669,10 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 	INIT_LIST_HEAD(&gdev->pin_ranges);
 #endif
 
-	ret = gpiochip_set_desc_names(gc);
+	if (gc->names)
+		ret = gpiochip_set_desc_names(gc);
+	else
+		ret = devprop_gpiochip_set_names(gc);
 	if (ret)
 		goto err_remove_from_list;
 
@@ -705,7 +756,7 @@ err_free_label:
 err_free_descs:
 	kfree(gdev->descs);
 err_free_ida:
-	ida_simple_remove(&gpio_ida, gdev->id);
+	ida_free(&gpio_ida, gdev->id);
 err_free_gdev:
 	/* failures here can mean systems won't boot... */
 	pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__,
@@ -2041,10 +2092,15 @@ static bool gpiod_free_commit(struct gpio_desc *desc)
 		clear_bit(FLAG_PULL_UP, &desc->flags);
 		clear_bit(FLAG_PULL_DOWN, &desc->flags);
 		clear_bit(FLAG_BIAS_DISABLE, &desc->flags);
+		clear_bit(FLAG_EDGE_RISING, &desc->flags);
+		clear_bit(FLAG_EDGE_FALLING, &desc->flags);
 		clear_bit(FLAG_IS_HOGGED, &desc->flags);
 #ifdef CONFIG_OF_DYNAMIC
 		desc->hog = NULL;
 #endif
+#ifdef CONFIG_GPIO_CDEV
+		WRITE_ONCE(desc->debounce_period_us, 0);
+#endif
 		ret = true;
 	}
 
@@ -4402,31 +4458,18 @@ static int gpiolib_seq_show(struct seq_file *s, void *v)
 	return 0;
 }
 
-static const struct seq_operations gpiolib_seq_ops = {
+static const struct seq_operations gpiolib_sops = {
 	.start = gpiolib_seq_start,
 	.next = gpiolib_seq_next,
 	.stop = gpiolib_seq_stop,
 	.show = gpiolib_seq_show,
 };
-
-static int gpiolib_open(struct inode *inode, struct file *file)
-{
-	return seq_open(file, &gpiolib_seq_ops);
-}
-
-static const struct file_operations gpiolib_operations = {
-	.owner		= THIS_MODULE,
-	.open		= gpiolib_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= seq_release,
-};
+DEFINE_SEQ_ATTRIBUTE(gpiolib);
 
 static int __init gpiolib_debugfs_init(void)
 {
 	/* /sys/kernel/debug/gpio */
-	debugfs_create_file("gpio", S_IFREG | S_IRUGO, NULL, NULL,
-			    &gpiolib_operations);
+	debugfs_create_file("gpio", 0444, NULL, NULL, &gpiolib_fops);
 	return 0;
 }
 subsys_initcall(gpiolib_debugfs_init);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 6709f79c02dd..b674b5bb980e 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -114,6 +114,8 @@ struct gpio_desc {
 #define FLAG_PULL_UP    13	/* GPIO has pull up enabled */
 #define FLAG_PULL_DOWN  14	/* GPIO has pull down enabled */
 #define FLAG_BIAS_DISABLE    15	/* GPIO has pull disabled */
+#define FLAG_EDGE_RISING     16	/* GPIO CDEV detects rising edge events */
+#define FLAG_EDGE_FALLING    17	/* GPIO CDEV detects falling edge events */
 
 	/* Connection label */
 	const char		*label;
@@ -122,6 +124,10 @@ struct gpio_desc {
 #ifdef CONFIG_OF_DYNAMIC
 	struct device_node	*hog;
 #endif
+#ifdef CONFIG_GPIO_CDEV
+	/* debounce period in microseconds */
+	unsigned int		debounce_period_us;
+#endif
 };
 
 int gpiod_request(struct gpio_desc *desc, const char *label);