Merge tag 'gpio-v4.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "Here is the bulk of GPIO changes for the v4.4 development cycle.

  The only changes hitting outside drivers/gpio are in the pin control
  subsystem and these seem to have settled nicely in linux-next.

  Development mistakes and catfights are nicely documented in the
  reverts as you can see.  The outcome of the ABI fight is that we're
  working on a chardev ABI for GPIO now, where hope to show results for
  the v4.5 kernel.

  Summary of changes:

  GPIO core:
   - Define and handle flags for open drain/open collector and open
     source/open emitter, also know as "single-ended" configurations.
   - Generic request/free operations that handle calling out to the
     (optional) pin control backend.
   - Some refactoring related to an ABI change that did not happen, yet
     provide useful.
   - Added a real-time compliance checklist.  Many GPIO chips have
     irqchips, and need to think this over with the RT patches going
     upstream.
   - Restructure, fix and clean up Kconfig menus a bit.

  New drivers:
   - New driver for AMD Promony.
   - New driver for ACCES 104-IDIO-16, a port-mapped I/O card,
     ISA-style.  Very retro.

  Subdriver changes:
   - OMAP changes to handle real time requirements.
   - Handle trigger types for edge and level IRQs on PL061 properly.  As
     this hardware is very common it needs to set a proper example for
     others to follow.
   - Some container_of() cleanups.
   - Delete the unused MSM driver in favor of the driver that is
     embedded inside the pin control driver.
   - Cleanup of the ath79 GPIO driver used by many, many OpenWRT router
     targets.
   - A consolidated IT87xx driver replacing the earlier very specific
     IT8761e driver.
   - Handle the TI TCA9539 in the PCA953x driver.  Also handle ACPI
     devices in this subdriver.
   - Drop xilinx arch dependencies as these FPGAs seem to profilate over
     a few different architectures.  MIPS and ARM come to mind"

* tag 'gpio-v4.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (57 commits)
  gpio: fix up SPI submenu
  gpio: drop surplus I2C dependencies
  gpio: drop surplus X86 dependencies
  gpio: dt-bindings: document the official use of "ngpios"
  gpio: MAINTAINERS: Add an entry for the ATH79 GPIO driver
  gpio / ACPI: Allow shared GPIO event to be read via operation region
  gpio: group port-mapped I/O drivers in a menu
  gpio: Add ACCES 104-IDIO-16 driver maintainer entry
  gpio: zynq: Document interrupt-controller DT binding
  gpio: xilinx: Drop architecture dependencies
  gpio: generic: Revert to old error handling in bgpio_map
  gpio: add a real time compliance notes
  Revert "gpio: add a real time compliance checklist"
  gpio: Add GPIO support for the ACCES 104-IDIO-16
  gpio: driver for AMD Promontory
  gpio: xlp: Convert to use gpiolib irqchip helpers
  gpio: add a real time compliance checklist
  gpio/xilinx: enable for MIPS
  gpiolib: Add and use OF_GPIO_SINGLE_ENDED flag
  gpiolib: Split GPIO flags parsing and GPIO configuration
  ...

1 files changed, 43 insertions, 39 deletions

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 5236db161e76..56d2d026e62e 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -51,7 +51,7 @@ struct gpio_regs {
 struct gpio_bank {
 	struct list_head node;
 	void __iomem *base;
-	u16 irq;
+	int irq;
 	u32 non_wakeup_gpios;
 	u32 enabled_non_wakeup_gpios;
 	struct gpio_regs context;
@@ -59,6 +59,7 @@ struct gpio_bank {
 	u32 level_mask;
 	u32 toggle_mask;
 	raw_spinlock_t lock;
+	raw_spinlock_t wa_lock;
 	struct gpio_chip chip;
 	struct clk *dbck;
 	u32 mod_usage;
@@ -496,9 +497,6 @@ static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
 		(type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
 		return -EINVAL;
 
-	if (!BANK_USED(bank))
-		pm_runtime_get_sync(bank->dev);
-
 	raw_spin_lock_irqsave(&bank->lock, flags);
 	retval = omap_set_gpio_triggering(bank, offset, type);
 	if (retval) {
@@ -521,8 +519,6 @@ static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
 	return 0;
 
 error:
-	if (!BANK_USED(bank))
-		pm_runtime_put(bank->dev);
 	return retval;
 }
 
@@ -654,8 +650,13 @@ static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
 {
 	struct gpio_bank *bank = omap_irq_data_get_bank(d);
 	unsigned offset = d->hwirq;
+	int ret;
+
+	ret = omap_set_gpio_wakeup(bank, offset, enable);
+	if (!ret)
+		ret = irq_set_irq_wake(bank->irq, enable);
 
-	return omap_set_gpio_wakeup(bank, offset, enable);
+	return ret;
 }
 
 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
@@ -709,26 +710,21 @@ static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
  * line's interrupt handler has been run, we may miss some nested
  * interrupts.
  */
-static void omap_gpio_irq_handler(struct irq_desc *desc)
+static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
 {
 	void __iomem *isr_reg = NULL;
 	u32 isr;
 	unsigned int bit;
-	struct gpio_bank *bank;
-	int unmasked = 0;
-	struct irq_chip *irqchip = irq_desc_get_chip(desc);
-	struct gpio_chip *chip = irq_desc_get_handler_data(desc);
+	struct gpio_bank *bank = gpiobank;
+	unsigned long wa_lock_flags;
 	unsigned long lock_flags;
 
-	chained_irq_enter(irqchip, desc);
-
-	bank = container_of(chip, struct gpio_bank, chip);
 	isr_reg = bank->base + bank->regs->irqstatus;
-	pm_runtime_get_sync(bank->dev);
-
 	if (WARN_ON(!isr_reg))
 		goto exit;
 
+	pm_runtime_get_sync(bank->dev);
+
 	while (1) {
 		u32 isr_saved, level_mask = 0;
 		u32 enabled;
@@ -750,13 +746,6 @@ static void omap_gpio_irq_handler(struct irq_desc *desc)
 
 		raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
 
-		/* if there is only edge sensitive GPIO pin interrupts
-		configured, we could unmask GPIO bank interrupt immediately */
-		if (!level_mask && !unmasked) {
-			unmasked = 1;
-			chained_irq_exit(irqchip, desc);
-		}
-
 		if (!isr)
 			break;
 
@@ -777,18 +766,18 @@ static void omap_gpio_irq_handler(struct irq_desc *desc)
 
 			raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
 
+			raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
+
 			generic_handle_irq(irq_find_mapping(bank->chip.irqdomain,
 							    bit));
+
+			raw_spin_unlock_irqrestore(&bank->wa_lock,
+						   wa_lock_flags);
 		}
 	}
-	/* if bank has any level sensitive GPIO pin interrupt
-	configured, we must unmask the bank interrupt only after
-	handler(s) are executed in order to avoid spurious bank
-	interrupt */
 exit:
-	if (!unmasked)
-		chained_irq_exit(irqchip, desc);
 	pm_runtime_put(bank->dev);
+	return IRQ_HANDLED;
 }
 
 static unsigned int omap_gpio_irq_startup(struct irq_data *d)
@@ -797,9 +786,6 @@ static unsigned int omap_gpio_irq_startup(struct irq_data *d)
 	unsigned long flags;
 	unsigned offset = d->hwirq;
 
-	if (!BANK_USED(bank))
-		pm_runtime_get_sync(bank->dev);
-
 	raw_spin_lock_irqsave(&bank->lock, flags);
 
 	if (!LINE_USED(bank->mod_usage, offset))
@@ -815,8 +801,6 @@ static unsigned int omap_gpio_irq_startup(struct irq_data *d)
 	return 0;
 err:
 	raw_spin_unlock_irqrestore(&bank->lock, flags);
-	if (!BANK_USED(bank))
-		pm_runtime_put(bank->dev);
 	return -EINVAL;
 }
 
@@ -835,6 +819,19 @@ static void omap_gpio_irq_shutdown(struct irq_data *d)
 		omap_clear_gpio_debounce(bank, offset);
 	omap_disable_gpio_module(bank, offset);
 	raw_spin_unlock_irqrestore(&bank->lock, flags);
+}
+
+static void omap_gpio_irq_bus_lock(struct irq_data *data)
+{
+	struct gpio_bank *bank = omap_irq_data_get_bank(data);
+
+	if (!BANK_USED(bank))
+		pm_runtime_get_sync(bank->dev);
+}
+
+static void gpio_irq_bus_sync_unlock(struct irq_data *data)
+{
+	struct gpio_bank *bank = omap_irq_data_get_bank(data);
 
 	/*
 	 * If this is the last IRQ to be freed in the bank,
@@ -1132,7 +1129,7 @@ static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
 	}
 
 	ret = gpiochip_irqchip_add(&bank->chip, irqc,
-				   irq_base, omap_gpio_irq_handler,
+				   irq_base, handle_bad_irq,
 				   IRQ_TYPE_NONE);
 
 	if (ret) {
@@ -1141,10 +1138,14 @@ static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
 		return -ENODEV;
 	}
 
-	gpiochip_set_chained_irqchip(&bank->chip, irqc,
-				     bank->irq, omap_gpio_irq_handler);
+	gpiochip_set_chained_irqchip(&bank->chip, irqc, bank->irq, NULL);
 
-	return 0;
+	ret = devm_request_irq(bank->dev, bank->irq, omap_gpio_irq_handler,
+			       0, dev_name(bank->dev), bank);
+	if (ret)
+		gpiochip_remove(&bank->chip);
+
+	return ret;
 }
 
 static const struct of_device_id omap_gpio_match[];
@@ -1183,6 +1184,8 @@ static int omap_gpio_probe(struct platform_device *pdev)
 	irqc->irq_unmask = omap_gpio_unmask_irq,
 	irqc->irq_set_type = omap_gpio_irq_type,
 	irqc->irq_set_wake = omap_gpio_wake_enable,
+	irqc->irq_bus_lock = omap_gpio_irq_bus_lock,
+	irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
 	irqc->name = dev_name(&pdev->dev);
 
 	bank->irq = platform_get_irq(pdev, 0);
@@ -1224,6 +1227,7 @@ static int omap_gpio_probe(struct platform_device *pdev)
 		bank->set_dataout = omap_set_gpio_dataout_mask;
 
 	raw_spin_lock_init(&bank->lock);
+	raw_spin_lock_init(&bank->wa_lock);
 
 	/* Static mapping, never released */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);