mfd: stpmic1: Add STPMIC1 driver

STPMIC1 is a PMIC from STMicroelectronics. The STPMIC1 integrates 10
regulators, 3 power switches, a watchdog and an input for a power on key.

Signed-off-by: Pascal Paillet <p.paillet@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 230 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 8c5dfdce4326..0761cb83d174 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1871,6 +1871,22 @@ config MFD_STM32_TIMERS
 	  for PWM and IIO Timer. This driver allow to share the
 	  registers between the others drivers.
 
+config MFD_STPMIC1
+	tristate "Support for STPMIC1 PMIC"
+	depends on (I2C=y && OF)
+	select REGMAP_I2C
+	select REGMAP_IRQ
+	select MFD_CORE
+	help
+	  Support for ST Microelectronics STPMIC1 PMIC. STPMIC1 has power on
+	  key, watchdog and regulator functionalities which are supported via
+	  the relevant subsystems. This driver provides core support for the
+	  STPMIC1. In order to use the actual functionaltiy of the device other
+	  drivers must be enabled.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called stpmic1.
+
 menu "Multimedia Capabilities Port drivers"
 	depends on ARCH_SA1100
 
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 12980a4ad460..a62fb0112d9f 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -233,6 +233,7 @@ obj-$(CONFIG_INTEL_SOC_PMIC_CHTDC_TI)	+= intel_soc_pmic_chtdc_ti.o
 obj-$(CONFIG_MFD_MT6397)	+= mt6397-core.o
 
 obj-$(CONFIG_MFD_ALTERA_A10SR)	+= altera-a10sr.o
+obj-$(CONFIG_MFD_STPMIC1)	+= stpmic1.o
 obj-$(CONFIG_MFD_SUN4I_GPADC)	+= sun4i-gpadc.o
 
 obj-$(CONFIG_MFD_STM32_LPTIMER)	+= stm32-lptimer.o
diff --git a/drivers/mfd/stpmic1.c b/drivers/mfd/stpmic1.c
new file mode 100644
index 000000000000..7dfbe8906cb8
--- /dev/null
+++ b/drivers/mfd/stpmic1.c
@@ -0,0 +1,213 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) STMicroelectronics 2018
+// Author: Pascal Paillet <p.paillet@st.com>
+
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/stpmic1.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/pm_wakeirq.h>
+#include <linux/regmap.h>
+
+#include <dt-bindings/mfd/st,stpmic1.h>
+
+#define STPMIC1_MAIN_IRQ 0
+
+static const struct regmap_range stpmic1_readable_ranges[] = {
+	regmap_reg_range(TURN_ON_SR, VERSION_SR),
+	regmap_reg_range(SWOFF_PWRCTRL_CR, LDO6_STDBY_CR),
+	regmap_reg_range(BST_SW_CR, BST_SW_CR),
+	regmap_reg_range(INT_PENDING_R1, INT_PENDING_R4),
+	regmap_reg_range(INT_CLEAR_R1, INT_CLEAR_R4),
+	regmap_reg_range(INT_MASK_R1, INT_MASK_R4),
+	regmap_reg_range(INT_SET_MASK_R1, INT_SET_MASK_R4),
+	regmap_reg_range(INT_CLEAR_MASK_R1, INT_CLEAR_MASK_R4),
+	regmap_reg_range(INT_SRC_R1, INT_SRC_R1),
+};
+
+static const struct regmap_range stpmic1_writeable_ranges[] = {
+	regmap_reg_range(SWOFF_PWRCTRL_CR, LDO6_STDBY_CR),
+	regmap_reg_range(BST_SW_CR, BST_SW_CR),
+	regmap_reg_range(INT_CLEAR_R1, INT_CLEAR_R4),
+	regmap_reg_range(INT_SET_MASK_R1, INT_SET_MASK_R4),
+	regmap_reg_range(INT_CLEAR_MASK_R1, INT_CLEAR_MASK_R4),
+};
+
+static const struct regmap_range stpmic1_volatile_ranges[] = {
+	regmap_reg_range(TURN_ON_SR, VERSION_SR),
+	regmap_reg_range(WCHDG_CR, WCHDG_CR),
+	regmap_reg_range(INT_PENDING_R1, INT_PENDING_R4),
+	regmap_reg_range(INT_SRC_R1, INT_SRC_R4),
+};
+
+static const struct regmap_access_table stpmic1_readable_table = {
+	.yes_ranges = stpmic1_readable_ranges,
+	.n_yes_ranges = ARRAY_SIZE(stpmic1_readable_ranges),
+};
+
+static const struct regmap_access_table stpmic1_writeable_table = {
+	.yes_ranges = stpmic1_writeable_ranges,
+	.n_yes_ranges = ARRAY_SIZE(stpmic1_writeable_ranges),
+};
+
+static const struct regmap_access_table stpmic1_volatile_table = {
+	.yes_ranges = stpmic1_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(stpmic1_volatile_ranges),
+};
+
+const struct regmap_config stpmic1_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.cache_type = REGCACHE_RBTREE,
+	.max_register = PMIC_MAX_REGISTER_ADDRESS,
+	.rd_table = &stpmic1_readable_table,
+	.wr_table = &stpmic1_writeable_table,
+	.volatile_table = &stpmic1_volatile_table,
+};
+
+static const struct regmap_irq stpmic1_irqs[] = {
+	REGMAP_IRQ_REG(IT_PONKEY_F, 0, 0x01),
+	REGMAP_IRQ_REG(IT_PONKEY_R, 0, 0x02),
+	REGMAP_IRQ_REG(IT_WAKEUP_F, 0, 0x04),
+	REGMAP_IRQ_REG(IT_WAKEUP_R, 0, 0x08),
+	REGMAP_IRQ_REG(IT_VBUS_OTG_F, 0, 0x10),
+	REGMAP_IRQ_REG(IT_VBUS_OTG_R, 0, 0x20),
+	REGMAP_IRQ_REG(IT_SWOUT_F, 0, 0x40),
+	REGMAP_IRQ_REG(IT_SWOUT_R, 0, 0x80),
+
+	REGMAP_IRQ_REG(IT_CURLIM_BUCK1, 1, 0x01),
+	REGMAP_IRQ_REG(IT_CURLIM_BUCK2, 1, 0x02),
+	REGMAP_IRQ_REG(IT_CURLIM_BUCK3, 1, 0x04),
+	REGMAP_IRQ_REG(IT_CURLIM_BUCK4, 1, 0x08),
+	REGMAP_IRQ_REG(IT_OCP_OTG, 1, 0x10),
+	REGMAP_IRQ_REG(IT_OCP_SWOUT, 1, 0x20),
+	REGMAP_IRQ_REG(IT_OCP_BOOST, 1, 0x40),
+	REGMAP_IRQ_REG(IT_OVP_BOOST, 1, 0x80),
+
+	REGMAP_IRQ_REG(IT_CURLIM_LDO1, 2, 0x01),
+	REGMAP_IRQ_REG(IT_CURLIM_LDO2, 2, 0x02),
+	REGMAP_IRQ_REG(IT_CURLIM_LDO3, 2, 0x04),
+	REGMAP_IRQ_REG(IT_CURLIM_LDO4, 2, 0x08),
+	REGMAP_IRQ_REG(IT_CURLIM_LDO5, 2, 0x10),
+	REGMAP_IRQ_REG(IT_CURLIM_LDO6, 2, 0x20),
+	REGMAP_IRQ_REG(IT_SHORT_SWOTG, 2, 0x40),
+	REGMAP_IRQ_REG(IT_SHORT_SWOUT, 2, 0x80),
+
+	REGMAP_IRQ_REG(IT_TWARN_F, 3, 0x01),
+	REGMAP_IRQ_REG(IT_TWARN_R, 3, 0x02),
+	REGMAP_IRQ_REG(IT_VINLOW_F, 3, 0x04),
+	REGMAP_IRQ_REG(IT_VINLOW_R, 3, 0x08),
+	REGMAP_IRQ_REG(IT_SWIN_F, 3, 0x40),
+	REGMAP_IRQ_REG(IT_SWIN_R, 3, 0x80),
+};
+
+static const struct regmap_irq_chip stpmic1_regmap_irq_chip = {
+	.name = "pmic_irq",
+	.status_base = INT_PENDING_R1,
+	.mask_base = INT_CLEAR_MASK_R1,
+	.unmask_base = INT_SET_MASK_R1,
+	.ack_base = INT_CLEAR_R1,
+	.num_regs = STPMIC1_PMIC_NUM_IRQ_REGS,
+	.irqs = stpmic1_irqs,
+	.num_irqs = ARRAY_SIZE(stpmic1_irqs),
+};
+
+static int stpmic1_probe(struct i2c_client *i2c,
+			 const struct i2c_device_id *id)
+{
+	struct stpmic1 *ddata;
+	struct device *dev = &i2c->dev;
+	int ret;
+	struct device_node *np = dev->of_node;
+	u32 reg;
+
+	ddata = devm_kzalloc(dev, sizeof(struct stpmic1), GFP_KERNEL);
+	if (!ddata)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, ddata);
+	ddata->dev = dev;
+
+	ddata->regmap = devm_regmap_init_i2c(i2c, &stpmic1_regmap_config);
+	if (IS_ERR(ddata->regmap))
+		return PTR_ERR(ddata->regmap);
+
+	ddata->irq = of_irq_get(np, STPMIC1_MAIN_IRQ);
+	if (ddata->irq < 0) {
+		dev_err(dev, "Failed to get main IRQ: %d\n", ddata->irq);
+		return ddata->irq;
+	}
+
+	ret = regmap_read(ddata->regmap, VERSION_SR, &reg);
+	if (ret) {
+		dev_err(dev, "Unable to read PMIC version\n");
+		return ret;
+	}
+	dev_info(dev, "PMIC Chip Version: 0x%x\n", reg);
+
+	/* Initialize PMIC IRQ Chip & associated IRQ domains */
+	ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq,
+				       IRQF_ONESHOT | IRQF_SHARED,
+				       0, &stpmic1_regmap_irq_chip,
+				       &ddata->irq_data);
+	if (ret) {
+		dev_err(dev, "IRQ Chip registration failed: %d\n", ret);
+		return ret;
+	}
+
+	return devm_of_platform_populate(dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int stpmic1_suspend(struct device *dev)
+{
+	struct i2c_client *i2c = to_i2c_client(dev);
+	struct stpmic1 *pmic_dev = i2c_get_clientdata(i2c);
+
+	disable_irq(pmic_dev->irq);
+
+	return 0;
+}
+
+static int stpmic1_resume(struct device *dev)
+{
+	struct i2c_client *i2c = to_i2c_client(dev);
+	struct stpmic1 *pmic_dev = i2c_get_clientdata(i2c);
+	int ret;
+
+	ret = regcache_sync(pmic_dev->regmap);
+	if (ret)
+		return ret;
+
+	enable_irq(pmic_dev->irq);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(stpmic1_pm, stpmic1_suspend, stpmic1_resume);
+
+static const struct of_device_id stpmic1_of_match[] = {
+	{ .compatible = "st,stpmic1", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, stpmic1_of_match);
+
+static struct i2c_driver stpmic1_driver = {
+	.driver = {
+		.name = "stpmic1",
+		.of_match_table = of_match_ptr(stpmic1_of_match),
+		.pm = &stpmic1_pm,
+	},
+	.probe = stpmic1_probe,
+};
+
+module_i2c_driver(stpmic1_driver);
+
+MODULE_DESCRIPTION("STPMIC1 PMIC Driver");
+MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");
+MODULE_LICENSE("GPL v2");