[PATCH v3 1/2] mfd: Add support for MAX77686.

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From: Yadwinder Singh Brar <yadi.brar@xxxxxxxxxxx>

MAX77686 is a mulitifunction device with PMIC, RTC and Charger on chip. Th
driver provides common support for accessing the device. This is initial
version of this driver that supports to enable the chip with its primary I
bus.It also includes IRQ and device tree support for MAX77686 chip.

Signed-off-by: Yadwinder Singh Brar <yadi.brar@xxxxxxxxxxx>
Reviewed-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/mfd/max77686.txt |   61 ++++
 drivers/mfd/Kconfig                                |   21 ++
 drivers/mfd/Makefile                               |    1 +
 drivers/mfd/max77686-irq.c                         |  255 ++++++++++++++++
 drivers/mfd/max77686.c                             |  322 ++++++++++++++++++++
 include/linux/mfd/max77686-private.h               |  282 +++++++++++++++++
 include/linux/mfd/max77686.h                       |  100 ++++++
 7 files changed, 1042 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/max77686.txt
 create mode 100644 drivers/mfd/max77686-irq.c
 create mode 100644 drivers/mfd/max77686.c
 create mode 100644 include/linux/mfd/max77686-private.h
 create mode 100644 include/linux/mfd/max77686.h

diff --git a/Documentation/devicetree/bindings/mfd/max77686.txt b/Documentation/devicetree/bindings/mfd/max77686.txt
new file mode 100644
index 0000000..78a47bd
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/max77686.txt
@@ -0,0 +1,61 @@
+Maxim MAX77686 multi-function device
+
+MAX77686 is a Mulitifunction device with PMIC, RTC and Charger on chip. It is
+interfaced to host controller using i2c interface. PMIC and Charger submodules
+are addressed using same i2c slave address where as RTC submodule uses
+different slave address,presently for which we are statically creating i2c
+client while probing.This document describes the binding for mfd device and
+PMIC submodule.
+
+Required properties:
+- compatible : Must be "maxim,max77686";
+- reg : Specifiec the i2c slave address of PMIC block.
+- interrupts : This i2c device has an IRQ line connected to the main SoC.
+- interrupt-parent : The parent interrupt controller.
+
+Optional node:
+- max77686,buck_ramp_delay : Ramp delay to be setup for buck2,3&4.
+
+- voltage-regulators : The regulators of max77686 have to be instantiated
+  under subnode named "voltage-regulators" uing the following format.
+
+	regulator_name {
+		standard regulator constraints....
+	};
+	refer Documentation/devicetree/bindings/regulator/regulator.txt
+
+  The names of regulator should be as follow:
+
+	-LDOn 	:	for LDOs, where n can lie in range 1 to 26.
+		 	example: LDO1, LDO2, LDO26.
+	-BUCKn 	:	for BUCKs, where n can lie in range 1 to 9.
+			example: BUCK1, BUCK5, BUCK9.
+
+
+Example:
+
+	max77686_pmic@09 {
+		compatible = "maxim,max77686";
+		interrupt-parent = <&wakeup_eint>;
+		interrupts = <26 0>;
+		reg = <0x09>;
+
+		max77686,buck_ramp_delay = <2>;		/* default */
+
+		voltage-regulators {
+			ldo11_reg: LDO11 {
+				regulator-name = "vdd_ldo11";
+				regulator-min-microvolt = <1900000>;
+				regulator-max-microvolt = <1900000>;
+				regulator-always-on;
+			};
+
+			buck1_reg: BUCK1 {
+				regulator-name = "vdd_mif";
+				regulator-min-microvolt = <950000>;
+				regulator-max-microvolt = <1300000>;
+				regulator-always-on;
+				regulator-boot-on;
+			};
+	}
+
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index a4fd173..d8285e5 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -442,6 +442,27 @@ config MFD_MAX8998
 	  additional drivers must be enabled in order to use the functionality
 	  of the device.
 
+config MFD_MAX77686
+	bool "Maxim Semiconductor MAX77686 PMIC Support"
+	depends on I2C=y && GENERIC_HARDIRQS
+	select MFD_CORE
+	select REGMAP_I2C
+	help
+	  Say yes here to support for Maxim Semiconductor MAX77686.
+	  This is a Power Management IC with RTC on chip.
+	  This driver provides common support for accessing the device;
+	  additional drivers must be enabled in order to use the functionality
+	  of the device.
+
+config DEBUG_MAX77686
+	bool "MAX77686 PMIC debugging"
+	depends on MFD_MAX77686
+	help
+	  Say yes, if you need enable debug messages in
+	  MFD_MAX77686 driver.
+	  Further for enabling/disabling particular type of debug
+	  messages set max77686_debug_mask accordingly.
+
 config MFD_S5M_CORE
 	bool "SAMSUNG S5M Series Support"
 	depends on I2C=y && GENERIC_HARDIRQS
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 05fa538..19ecca9 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -79,6 +79,7 @@ max8925-objs			:= max8925-core.o max8925-i2c.o
 obj-$(CONFIG_MFD_MAX8925)	+= max8925.o
 obj-$(CONFIG_MFD_MAX8997)	+= max8997.o max8997-irq.o
 obj-$(CONFIG_MFD_MAX8998)	+= max8998.o max8998-irq.o
+obj-$(CONFIG_MFD_MAX77686)	+= max77686.o max77686-irq.o
 
 pcf50633-objs			:= pcf50633-core.o pcf50633-irq.o
 obj-$(CONFIG_MFD_PCF50633)	+= pcf50633.o
diff --git a/drivers/mfd/max77686-irq.c b/drivers/mfd/max77686-irq.c
new file mode 100644
index 0000000..f57b96e
--- /dev/null
+++ b/drivers/mfd/max77686-irq.c
@@ -0,0 +1,255 @@
+/*
+ * max77686-irq.c - Interrupt controller support for MAX77686
+ *
+ * Copyright (C) 2012 Samsung Electronics Co.Ltd
+ * Chiwoong Byun <woong.byun@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This driver is based on max8997-irq.c
+ */
+
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/max77686.h>
+#include <linux/mfd/max77686-private.h>
+#include <linux/irqdomain.h>
+
+#define IRQ_GRP (data->hwirq >> 3)
+#define IRQ_MASK (1 << (data->hwirq & 7))
+
+int max77686_debug_mask = MAX77686_DEBUG_INFO; /* enable debug prints */
+
+static const int max77686_mask_reg[] = {
+	[PMIC_INT1]	= MAX77686_REG_INT1MSK,
+	[PMIC_INT2]	= MAX77686_REG_INT2MSK,
+	[RTC_INT]	= MAX77686_RTC_INTM,
+};
+
+static struct i2c_client *max77686_get_i2c(struct max77686_dev *max77686,
+					   enum max77686_irq_source src)
+{
+	switch (src) {
+	case PMIC_INT1...PMIC_INT2:
+		return max77686->i2c;
+	case RTC_INT:
+		return max77686->rtc;
+	default:
+		return ERR_PTR(-EINVAL);
+	}
+}
+
+static void max77686_irq_lock(struct irq_data *data)
+{
+	struct max77686_dev *max77686 = irq_get_chip_data(data->irq);
+
+	mutex_lock(&max77686->irqlock);
+}
+
+static void max77686_irq_sync_unlock(struct irq_data *data)
+{
+	struct max77686_dev *max77686 = irq_get_chip_data(data->irq);
+	int i;
+
+	for (i = 0; i < MAX77686_IRQ_GROUP_NR; i++) {
+		int mask_reg = max77686_mask_reg[i];
+		struct i2c_client *i2c = max77686_get_i2c(max77686, i);
+
+		dbg_mask("%s: mask_reg[%d]=0x%x, cur=0x%x\n",
+			__func__, i, mask_reg, max77686->irq_masks_cur[i]);
+
+		if (mask_reg == MAX77686_REG_INVALID || IS_ERR_OR_NULL(i2c))
+			continue;
+
+		max77686->irq_masks_cache[i] = max77686->irq_masks_cur[i];
+
+		max77686_write_reg(i2c, max77686_mask_reg[i],
+				   max77686->irq_masks_cur[i]);
+	}
+
+	mutex_unlock(&max77686->irqlock);
+}
+
+static void max77686_irq_mask(struct irq_data *data)
+{
+	struct max77686_dev *max77686 = irq_get_chip_data(data->irq);
+
+	max77686->irq_masks_cur[IRQ_GRP] |= IRQ_MASK;
+	dbg_mask("%s: group=%x, cur=0x%x\n",
+		__func__, IRQ_GRP,
+		max77686->irq_masks_cur[IRQ_GRP]);
+
+}
+
+static void max77686_irq_unmask(struct irq_data *data)
+{
+	struct max77686_dev *max77686 = irq_get_chip_data(data->irq);
+
+	max77686->irq_masks_cur[IRQ_GRP] &= ~IRQ_MASK;
+	dbg_mask("%s: group=%x, cur=0x%x\n",
+		__func__, IRQ_GRP,
+		max77686->irq_masks_cur[IRQ_GRP]);
+
+}
+
+static struct irq_chip max77686_irq_chip = {
+	.name = "max77686",
+	.irq_bus_lock = max77686_irq_lock,
+	.irq_bus_sync_unlock = max77686_irq_sync_unlock,
+	.irq_mask = max77686_irq_mask,
+	.irq_unmask = max77686_irq_unmask,
+};
+
+static irqreturn_t max77686_irq_thread(int irq, void *data)
+{
+	struct max77686_dev *max77686 = data;
+	int irq_reg[MAX77686_IRQ_GROUP_NR] = { };
+	int irq_src;
+	int ret, grp, i, cur_irq;
+
+	ret = max77686_read_reg(max77686->i2c, MAX77686_REG_INTSRC, &irq_src);
+	if (ret < 0) {
+		dev_err(max77686->dev, "Failed to read interrupt source: %d\n",
+			ret);
+		return IRQ_NONE;
+	}
+
+	ret = max77686_bulk_read(max77686->i2c, MAX77686_REG_INT1,
+				 2, irq_reg);
+	if (ret < 0) {
+		dev_err(max77686->dev,
+			"Failed to read pmic interrupt: %d\n", ret);
+		return IRQ_NONE;
+	}
+
+	dbg_int("%s: int1=0x%x, int2=0x%x\n", __func__,
+		irq_reg[PMIC_INT1], irq_reg[PMIC_INT2]);
+
+	if (irq_src & MAX77686_IRQSRC_RTC) {
+		ret = max77686_read_reg(max77686->rtc, MAX77686_RTC_INT,
+					&irq_reg[RTC_INT]);
+		if (ret < 0) {
+			dev_err(max77686->dev,
+				"Failed to read rtc interrupt: %d\n", ret);
+			return IRQ_NONE;
+		}
+		dbg_int("%s: rtc int=0x%x\n", __func__,
+			irq_reg[RTC_INT]);
+
+	}
+
+	for (grp = 0; grp < MAX77686_IRQ_GROUP_NR; grp++) {
+		irq_reg[grp] &= ~max77686->irq_masks_cur[grp];
+		i = 0;
+		while (irq_reg[grp]) {
+			if (irq_reg[grp] & (1 << i)) {
+				cur_irq = irq_find_mapping(max77686->irq_domain,
+						grp*8 + i);
+				if (cur_irq)
+					handle_nested_irq(cur_irq);
+
+				irq_reg[grp] &= ~(1 << i);
+				dbg_int("%s: Handled irq:%x from group:%x\n",
+					__func__, i, grp);
+			}
+			i++;
+		}
+	}
+
+	dbg_info("%s returning\n", __func__);
+
+	return IRQ_HANDLED;
+}
+
+int max77686_irq_resume(struct max77686_dev *max77686)
+{
+	if (max77686->irq && max77686->irq_domain)
+		max77686_irq_thread(0, max77686);
+
+	return 0;
+}
+
+static int max77686_irq_domain_map(struct irq_domain *d, unsigned int irq,
+					irq_hw_number_t hw)
+{
+	struct max77686_dev *max77686 = d->host_data;
+
+	irq_set_chip_data(irq, max77686);
+	irq_set_chip_and_handler(irq, &max77686_irq_chip, handle_edge_irq);
+	irq_set_nested_thread(irq, 1);
+	set_irq_flags(irq, IRQF_VALID);
+	return 0;
+}
+
+static struct irq_domain_ops max77686_irq_domain_ops = {
+	.map = max77686_irq_domain_map,
+};
+
+int max77686_irq_init(struct max77686_dev *max77686)
+{
+	int i, ret;
+	struct irq_domain *domain;
+
+	if (!max77686->irq) {
+			dev_err(max77686->dev,
+				 "No interrupt specified.\n");
+			return -ENODEV;
+	}
+
+	mutex_init(&max77686->irqlock);
+
+	/* Mask individual interrupt sources */
+	for (i = 0; i < MAX77686_IRQ_GROUP_NR; i++) {
+		struct i2c_client *i2c;
+
+		max77686->irq_masks_cur[i] = 0xff;
+		max77686->irq_masks_cache[i] = 0xff;
+		i2c = max77686_get_i2c(max77686, i);
+
+		if (IS_ERR_OR_NULL(i2c))
+			continue;
+		if (max77686_mask_reg[i] == MAX77686_REG_INVALID)
+			continue;
+
+		max77686_write_reg(i2c, max77686_mask_reg[i], 0xff);
+	}
+
+	domain = irq_domain_add_linear(NULL, MAX77686_IRQ_NR,
+					&max77686_irq_domain_ops, &max77686);
+	if (!domain) {
+		dev_err(max77686->dev, "could not create irq domain\n");
+		return -ENODEV;
+	}
+
+	ret = request_threaded_irq(max77686->irq, NULL, max77686_irq_thread,
+				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+				   "max77686-irq", max77686);
+	if (ret) {
+		dev_err(max77686->dev, "Failed to request IRQ %d: %d\n",
+			max77686->irq, ret);
+		return ret;
+	}
+
+	dbg_info("%s : done\n", __func__);
+
+	return 0;
+}
+
+void max77686_irq_exit(struct max77686_dev *max77686)
+{
+	if (max77686->irq)
+		free_irq(max77686->irq, max77686);
+}
diff --git a/drivers/mfd/max77686.c b/drivers/mfd/max77686.c
new file mode 100644
index 0000000..e36fb9b
--- /dev/null
+++ b/drivers/mfd/max77686.c
@@ -0,0 +1,322 @@
+/*
+ * max77686.c - mfd core driver for the Maxim 77686
+ *
+ * Copyright (C) 2012 Samsung Electronics Co.Ltd.
+ * Chiwoong Byun <woong.byun@xxxxxxxxxxx>
+ * Yadwinder Singh Brar <yadi.brar@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This driver is based on max8997.c
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/mutex.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max77686.h>
+#include <linux/mfd/max77686-private.h>
+
+#define I2C_ADDR_RTC    (0x0C >> 1)
+
+#ifdef CONFIG_OF
+static struct of_device_id __devinitdata max77686_pmic_dt_match[] = {
+	{.compatible = "maxim,max77686",	.data = 0},
+	{},
+};
+#endif
+
+static struct mfd_cell max77686_devs[] = {
+	{.name = "max77686-pmic",},
+	{.name = "max77686-rtc",},
+};
+
+struct regmap_config pmic_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = MAX77686_REG_32KHZ,
+};
+
+struct regmap_config rtc_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = MAX77686_ALARM2_DATE,
+};
+
+int max77686_read_reg(struct i2c_client *i2c, int reg, int *buf)
+{
+	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
+
+	if (i2c == max77686->i2c)
+		return regmap_read(max77686->regmap, reg, buf);
+	else
+		return regmap_read(max77686->rtc_regmap, reg, buf);
+}
+EXPORT_SYMBOL_GPL(max77686_read_reg);
+
+int max77686_bulk_read(struct i2c_client *i2c, int reg, int count,
+			int *buf)
+{
+	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
+
+	if (i2c == max77686->i2c)
+		return regmap_bulk_read(max77686->regmap, reg, buf, count);
+	else
+		return regmap_bulk_read(max77686->rtc_regmap, reg, buf, count);
+}
+EXPORT_SYMBOL_GPL(max77686_bulk_read);
+
+int max77686_write_reg(struct i2c_client *i2c, int reg, int buf)
+{
+	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
+	if (i2c == max77686->i2c)
+		return regmap_write(max77686->regmap, reg, buf);
+	else
+		return regmap_write(max77686->rtc_regmap, reg, buf);
+}
+EXPORT_SYMBOL_GPL(max77686_write_reg);
+
+int max77686_bulk_write(struct i2c_client *i2c,	int reg, int count,
+			int *buf)
+{
+	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
+
+	if (i2c == max77686->i2c)
+		return regmap_bulk_write(max77686->regmap, reg, buf, count);
+	else
+		return regmap_bulk_write(max77686->rtc_regmap, reg, buf, count);
+}
+EXPORT_SYMBOL_GPL(max77686_bulk_write);
+
+int max77686_update_reg(struct i2c_client *i2c, int reg, int val, int mask)
+{
+	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
+	if (i2c == max77686->i2c)
+		return regmap_update_bits(max77686->regmap, reg, mask, val);
+	else
+		return regmap_update_bits(max77686->rtc_regmap, reg, mask, val);
+}
+EXPORT_SYMBOL_GPL(max77686_update_reg);
+
+#ifdef CONFIG_OF
+static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
+								  *dev)
+{
+	struct max77686_platform_data *pd;
+
+	pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
+	if (!pd) {
+		dev_err(dev, "could not allocate memory for pdata\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	return pd;
+}
+#else
+static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
+								  *dev)
+{
+	return 0;
+}
+#endif
+
+static inline int max77686_i2c_get_driver_data(struct i2c_client *i2c,
+					       const struct i2c_device_id *id)
+{
+#ifdef CONFIG_OF
+	if (i2c->dev.of_node) {
+		const struct of_device_id *match;
+		match = of_match_node(max77686_pmic_dt_match,
+				i2c->dev.of_node);
+		return (int)match->data;
+	}
+#endif
+	return (int)id->driver_data;
+}
+
+static int max77686_i2c_probe(struct i2c_client *i2c,
+			      const struct i2c_device_id *id)
+{
+	struct max77686_dev *max77686;
+	struct max77686_platform_data *pdata = i2c->dev.platform_data;
+	int ret = 0;
+	int data;
+
+	max77686 = devm_kzalloc(&i2c->dev, sizeof(struct max77686_dev),
+				GFP_KERNEL);
+	if (max77686 == NULL) {
+		dev_err(max77686->dev, "could not allocate memory\n");
+		return -ENOMEM;
+	}
+
+	max77686->dev = &i2c->dev;
+
+	if (max77686->dev->of_node) {
+		pdata = max77686_i2c_parse_dt_pdata(max77686->dev);
+		if (IS_ERR(pdata)) {
+			dev_err(max77686->dev, "Unable to parse device tree\n");
+			return PTR_ERR(pdata);
+		}
+	}
+
+	if (!pdata) {
+		dev_err(max77686->dev, "No platform data found\n");
+		return -ENODEV;
+	}
+
+	i2c_set_clientdata(i2c, max77686);
+	max77686->i2c = i2c;
+	max77686->irq = i2c->irq;
+	max77686->type = max77686_i2c_get_driver_data(i2c, id);
+
+	max77686->pdata = pdata;
+	max77686->regmap = devm_regmap_init_i2c(max77686->i2c,
+						&pmic_regmap_config);
+	if (IS_ERR(max77686->regmap)) {
+		dev_err(max77686->dev, "Failed to allocate register map: %d\n",
+			ret);
+		return PTR_ERR(max77686->regmap);
+	}
+
+	max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
+	i2c_set_clientdata(max77686->rtc, max77686);
+	max77686->rtc_regmap = devm_regmap_init_i2c(max77686->rtc,
+						&rtc_regmap_config);
+	if (IS_ERR(max77686->rtc_regmap)) {
+		dev_err(max77686->dev, "rtc register mapping failed %d\n", ret);
+		ret = PTR_ERR(max77686->rtc_regmap);
+		goto err_i2c;
+	}
+
+	ret = max77686_read_reg(i2c, MAX77686_REG_DEVICE_ID, &data);
+	if (ret < 0) {
+		dev_err(max77686->dev, "device not found on this channel\n");
+		goto err_i2c;
+	} else
+		if (data & CHIP_REV)
+			dev_info(max77686->dev, "device found with id:0x%x\n"
+				, data);
+		else {
+			dev_err(max77686->dev, "inappropriate dev id\n");
+			goto err_i2c;
+		}
+
+	ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
+			      ARRAY_SIZE(max77686_devs), NULL, 0);
+
+	if (ret < 0) {
+		dev_err(max77686->dev, "mfd_add_devices failed\n");
+		goto err_i2c;
+	}
+
+	ret = max77686_irq_init(max77686);
+	if (ret < 0) {
+		dev_err(max77686->dev, "max77686_irq_init failed\n");
+		goto err_mfd;
+	}
+
+	pm_runtime_set_active(max77686->dev);
+	device_init_wakeup(max77686->dev, true);
+
+	return ret;
+
+ err_mfd:
+	mfd_remove_devices(max77686->dev);
+ err_i2c:
+	i2c_unregister_device(max77686->rtc);
+	return ret;
+}
+
+static int max77686_i2c_remove(struct i2c_client *i2c)
+{
+	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
+
+	device_init_wakeup(max77686->dev, 0);
+	pm_runtime_set_suspended(max77686->dev);
+	max77686_irq_exit(max77686);
+	mfd_remove_devices(max77686->dev);
+	i2c_unregister_device(max77686->rtc);
+	return 0;
+}
+
+static const struct i2c_device_id max77686_i2c_id[] = {
+	{"max77686", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
+
+static int max77686_suspend(struct device *dev)
+{
+	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(max77686->irq);
+
+	return 0;
+}
+
+static int max77686_resume(struct device *dev)
+{
+	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(max77686->irq);
+
+	max77686_irq_resume(max77686);
+	return 0;
+}
+
+const struct dev_pm_ops max77686_pm = {
+	.suspend = max77686_suspend,
+	.resume = max77686_resume,
+};
+
+static struct i2c_driver max77686_i2c_driver = {
+	.driver = {
+		   .name = "max77686",
+		   .owner = THIS_MODULE,
+		   .pm = &max77686_pm,
+		   .of_match_table = of_match_ptr(max77686_pmic_dt_match),
+		   },
+	.probe = max77686_i2c_probe,
+	.remove = max77686_i2c_remove,
+	.id_table = max77686_i2c_id,
+};
+
+static int __init max77686_i2c_init(void)
+{
+	return i2c_add_driver(&max77686_i2c_driver);
+}
+
+static void __exit max77686_i2c_exit(void)
+{
+	i2c_del_driver(&max77686_i2c_driver);
+}
+
+subsys_initcall(max77686_i2c_init);
+module_exit(max77686_i2c_exit);
+
+MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
+MODULE_AUTHOR("Chiwoong Byun <woong.byun@xxxxxxxxxxx>");
+MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/max77686-private.h b/include/linux/mfd/max77686-private.h
new file mode 100644
index 0000000..7abb331
--- /dev/null
+++ b/include/linux/mfd/max77686-private.h
@@ -0,0 +1,282 @@
+/*
+ * max77686.h - Voltage regulator driver for the Maxim 77686
+ *
+ *  Copyright (C) 2011 Samsung Electrnoics
+ *  Chiwoong Byun <woong.byun@xxxxxxxxxxx>
+ *  Yadwinder Singh Brar <yadi.brar@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINUX_MFD_MAX77686_PRIV_H
+#define __LINUX_MFD_MAX77686_PRIV_H
+
+#include <linux/i2c.h>
+
+#define MAX77686_REG_INVALID		(0xff)
+#define RAMP_MASK			(0xc0)
+#define CHIP_REV			(0x03)
+
+enum max77686_pmic_reg {
+	MAX77686_REG_DEVICE_ID		= 0x00,
+	MAX77686_REG_INTSRC		= 0x01,
+	MAX77686_REG_INT1		= 0x02,
+	MAX77686_REG_INT2		= 0x03,
+
+	MAX77686_REG_INT1MSK		= 0x04,
+	MAX77686_REG_INT2MSK		= 0x05,
+
+	MAX77686_REG_STATUS1		= 0x06,
+	MAX77686_REG_STATUS2		= 0x07,
+
+	MAX77686_REG_PWRON		= 0x08,
+	MAX77686_REG_ONOFF_DELAY	= 0x09,
+	MAX77686_REG_MRSTB		= 0x0A,
+	/* Reserved: 0x0B-0x0F */
+
+	MAX77686_REG_BUCK1CTRL		= 0x10,
+	MAX77686_REG_BUCK1OUT		= 0x11,
+	MAX77686_REG_BUCK2CTRL1		= 0x12,
+	MAX77686_REG_BUCK234FREQ	= 0x13,
+	MAX77686_REG_BUCK2DVS1		= 0x14,
+	MAX77686_REG_BUCK2DVS2		= 0x15,
+	MAX77686_REG_BUCK2DVS3		= 0x16,
+	MAX77686_REG_BUCK2DVS4		= 0x17,
+	MAX77686_REG_BUCK2DVS5		= 0x18,
+	MAX77686_REG_BUCK2DVS6		= 0x19,
+	MAX77686_REG_BUCK2DVS7		= 0x1A,
+	MAX77686_REG_BUCK2DVS8		= 0x1B,
+	MAX77686_REG_BUCK3CTRL1		= 0x1C,
+	/* Reserved: 0x1D */
+	MAX77686_REG_BUCK3DVS1		= 0x1E,
+	MAX77686_REG_BUCK3DVS2		= 0x1F,
+	MAX77686_REG_BUCK3DVS3		= 0x20,
+	MAX77686_REG_BUCK3DVS4		= 0x21,
+	MAX77686_REG_BUCK3DVS5		= 0x22,
+	MAX77686_REG_BUCK3DVS6		= 0x23,
+	MAX77686_REG_BUCK3DVS7		= 0x24,
+	MAX77686_REG_BUCK3DVS8		= 0x25,
+	MAX77686_REG_BUCK4CTRL1		= 0x26,
+	/* Reserved: 0x27 */
+	MAX77686_REG_BUCK4DVS1		= 0x28,
+	MAX77686_REG_BUCK4DVS2		= 0x29,
+	MAX77686_REG_BUCK4DVS3		= 0x2A,
+	MAX77686_REG_BUCK4DVS4		= 0x2B,
+	MAX77686_REG_BUCK4DVS5		= 0x2C,
+	MAX77686_REG_BUCK4DVS6		= 0x2D,
+	MAX77686_REG_BUCK4DVS7		= 0x2E,
+	MAX77686_REG_BUCK4DVS8		= 0x2F,
+	MAX77686_REG_BUCK5CTRL		= 0x30,
+	MAX77686_REG_BUCK5OUT		= 0x31,
+	MAX77686_REG_BUCK6CTRL		= 0x32,
+	MAX77686_REG_BUCK6OUT		= 0x33,
+	MAX77686_REG_BUCK7CTRL		= 0x34,
+	MAX77686_REG_BUCK7OUT		= 0x35,
+	MAX77686_REG_BUCK8CTRL		= 0x36,
+	MAX77686_REG_BUCK8OUT		= 0x37,
+	MAX77686_REG_BUCK9CTRL		= 0x38,
+	MAX77686_REG_BUCK9OUT		= 0x39,
+	/* Reserved: 0x3A-0x3F */
+
+	MAX77686_REG_LDO1CTRL1		= 0x40,
+	MAX77686_REG_LDO2CTRL1		= 0x41,
+	MAX77686_REG_LDO3CTRL1		= 0x42,
+	MAX77686_REG_LDO4CTRL1		= 0x43,
+	MAX77686_REG_LDO5CTRL1		= 0x44,
+	MAX77686_REG_LDO6CTRL1		= 0x45,
+	MAX77686_REG_LDO7CTRL1		= 0x46,
+	MAX77686_REG_LDO8CTRL1		= 0x47,
+	MAX77686_REG_LDO9CTRL1		= 0x48,
+	MAX77686_REG_LDO10CTRL1		= 0x49,
+	MAX77686_REG_LDO11CTRL1		= 0x4A,
+	MAX77686_REG_LDO12CTRL1		= 0x4B,
+	MAX77686_REG_LDO13CTRL1		= 0x4C,
+	MAX77686_REG_LDO14CTRL1		= 0x4D,
+	MAX77686_REG_LDO15CTRL1		= 0x4E,
+	MAX77686_REG_LDO16CTRL1		= 0x4F,
+	MAX77686_REG_LDO17CTRL1		= 0x50,
+	MAX77686_REG_LDO18CTRL1		= 0x51,
+	MAX77686_REG_LDO19CTRL1		= 0x52,
+	MAX77686_REG_LDO20CTRL1		= 0x53,
+	MAX77686_REG_LDO21CTRL1		= 0x54,
+	MAX77686_REG_LDO22CTRL1		= 0x55,
+	MAX77686_REG_LDO23CTRL1		= 0x56,
+	MAX77686_REG_LDO24CTRL1		= 0x57,
+	MAX77686_REG_LDO25CTRL1		= 0x58,
+	MAX77686_REG_LDO26CTRL1		= 0x59,
+	/* Reserved: 0x5A-0x5F */
+	MAX77686_REG_LDO1CTRL2		= 0x60,
+	MAX77686_REG_LDO2CTRL2		= 0x61,
+	MAX77686_REG_LDO3CTRL2		= 0x62,
+	MAX77686_REG_LDO4CTRL2		= 0x63,
+	MAX77686_REG_LDO5CTRL2		= 0x64,
+	MAX77686_REG_LDO6CTRL2		= 0x65,
+	MAX77686_REG_LDO7CTRL2		= 0x66,
+	MAX77686_REG_LDO8CTRL2		= 0x67,
+	MAX77686_REG_LDO9CTRL2		= 0x68,
+	MAX77686_REG_LDO10CTRL2		= 0x69,
+	MAX77686_REG_LDO11CTRL2		= 0x6A,
+	MAX77686_REG_LDO12CTRL2		= 0x6B,
+	MAX77686_REG_LDO13CTRL2		= 0x6C,
+	MAX77686_REG_LDO14CTRL2		= 0x6D,
+	MAX77686_REG_LDO15CTRL2		= 0x6E,
+	MAX77686_REG_LDO16CTRL2		= 0x6F,
+	MAX77686_REG_LDO17CTRL2		= 0x70,
+	MAX77686_REG_LDO18CTRL2		= 0x71,
+	MAX77686_REG_LDO19CTRL2		= 0x72,
+	MAX77686_REG_LDO20CTRL2		= 0x73,
+	MAX77686_REG_LDO21CTRL2		= 0x74,
+	MAX77686_REG_LDO22CTRL2		= 0x75,
+	MAX77686_REG_LDO23CTRL2		= 0x76,
+	MAX77686_REG_LDO24CTRL2		= 0x77,
+	MAX77686_REG_LDO25CTRL2		= 0x78,
+	MAX77686_REG_LDO26CTRL2		= 0x79,
+	/* Reserved: 0x7A-0x7D */
+
+	MAX77686_REG_BBAT_CHG		= 0x7E,
+	MAX77686_REG_32KHZ		= 0x7F,
+
+	MAX77686_REG_PMIC_END		= 0x80,
+};
+
+enum max77686_rtc_reg {
+	MAX77686_RTC_INT		= 0x00,
+	MAX77686_RTC_INTM		= 0x01,
+	MAX77686_RTC_CONTROLM		= 0x02,
+	MAX77686_RTC_CONTROL		= 0x03,
+	MAX77686_RTC_UPDATE0		= 0x04,
+	/* Reserved: 0x5 */
+	MAX77686_WTSR_SMPL_CNTL		= 0x06,
+	MAX77686_RTC_SEC		= 0x07,
+	MAX77686_RTC_MIN		= 0x08,
+	MAX77686_RTC_HOUR		= 0x09,
+	MAX77686_RTC_WEEKDAY		= 0x0A,
+	MAX77686_RTC_MONTH		= 0x0B,
+	MAX77686_RTC_YEAR		= 0x0C,
+	MAX77686_RTC_DATE		= 0x0D,
+	MAX77686_ALARM1_SEC		= 0x0E,
+	MAX77686_ALARM1_MIN		= 0x0F,
+	MAX77686_ALARM1_HOUR		= 0x10,
+	MAX77686_ALARM1_WEEKDAY		= 0x11,
+	MAX77686_ALARM1_MONTH		= 0x12,
+	MAX77686_ALARM1_YEAR		= 0x13,
+	MAX77686_ALARM1_DATE		= 0x14,
+	MAX77686_ALARM2_SEC		= 0x15,
+	MAX77686_ALARM2_MIN		= 0x16,
+	MAX77686_ALARM2_HOUR		= 0x17,
+	MAX77686_ALARM2_WEEKDAY		= 0x18,
+	MAX77686_ALARM2_MONTH		= 0x19,
+	MAX77686_ALARM2_YEAR		= 0x1A,
+	MAX77686_ALARM2_DATE		= 0x1B,
+};
+
+#define MAX77686_IRQSRC_PMIC		(0)
+#define MAX77686_IRQSRC_RTC		(1 << 0)
+
+enum max77686_irq_source {
+	PMIC_INT1 = 0,
+	PMIC_INT2,
+	RTC_INT,
+
+	MAX77686_IRQ_GROUP_NR,
+};
+
+enum max77686_irq {
+	MAX77686_PMICIRQ_PWRONF = 0,
+	MAX77686_PMICIRQ_PWRONR,
+	MAX77686_PMICIRQ_JIGONBF,
+	MAX77686_PMICIRQ_JIGONBR,
+	MAX77686_PMICIRQ_ACOKBF,
+	MAX77686_PMICIRQ_ACOKBR,
+	MAX77686_PMICIRQ_ONKEY1S,
+	MAX77686_PMICIRQ_MRSTB,
+
+	MAX77686_PMICIRQ_140C,
+	MAX77686_PMICIRQ_120C,
+
+	MAX77686_RTCIRQ_RTC60S = 16,
+	MAX77686_RTCIRQ_RTCA1,
+	MAX77686_RTCIRQ_RTCA2,
+	MAX77686_RTCIRQ_SMPL,
+	MAX77686_RTCIRQ_RTC1S,
+	MAX77686_RTCIRQ_WTSR,
+
+	MAX77686_IRQ_NR,
+};
+
+struct max77686_dev {
+	struct device *dev;
+	struct i2c_client *i2c; /* 0xcc / PMIC, Battery Control, and FLASH */
+	struct i2c_client *rtc; /* slave addr 0x0c */
+	struct regmap *regmap;
+	struct regmap *rtc_regmap;
+	int type;
+	int irq;
+	struct mutex irqlock;
+	int irq_masks_cur[MAX77686_IRQ_GROUP_NR];
+	int irq_masks_cache[MAX77686_IRQ_GROUP_NR];
+	struct irq_domain *irq_domain;
+	struct max77686_platform_data *pdata;
+};
+
+extern int max77686_irq_init(struct max77686_dev *max77686);
+extern void max77686_irq_exit(struct max77686_dev *max77686);
+extern int max77686_irq_resume(struct max77686_dev *max77686);
+
+extern int max77686_read_reg(struct i2c_client *i2c, int reg, int *dest);
+extern int max77686_bulk_read(struct i2c_client *i2c, int reg, int count,
+				int *buf);
+extern int max77686_write_reg(struct i2c_client *i2c, int reg, int value);
+extern int max77686_bulk_write(struct i2c_client *i2c, int reg, int count,
+				int *buf);
+extern int max77686_update_reg(struct i2c_client *i2c, int reg, int val,
+				int mask);
+
+extern int max77686_debug_mask;		/* enables debug prints */
+
+enum {
+	MAX77686_DEBUG_INFO = 1 << 0,
+	MAX77686_DEBUG_MASK = 1 << 1,
+	MAX77686_DEBUG_INT = 1 << 2,
+};
+
+#ifndef CONFIG_DEBUG_MAX77686
+
+#define dbg_mask(fmt, ...) do { } while (0)
+#define dbg_info(fmt, ...) do { } while (0)
+#define dbg_int(fmt, ...) do { } while (0)
+
+#else
+
+#define dbg_mask(fmt, ...)					\
+do {								\
+	if (max77686_debug_mask & MAX77686_DEBUG_MASK)		\
+		printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__);	\
+} while (0)
+
+#define dbg_info(fmt, ...)					\
+do {								\
+	if (max77686_debug_mask & MAX77686_DEBUG_INFO)		\
+		printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__);	\
+} while (0)
+
+#define dbg_int(fmt, ...)					\
+do {								\
+	if (max77686_debug_mask & MAX77686_DEBUG_INT)		\
+		printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__);	\
+} while (0)
+#endif /* DEBUG_MAX77686 */
+
+#endif /*  __LINUX_MFD_MAX77686_PRIV_H */
diff --git a/include/linux/mfd/max77686.h b/include/linux/mfd/max77686.h
new file mode 100644
index 0000000..104cc82
--- /dev/null
+++ b/include/linux/mfd/max77686.h
@@ -0,0 +1,100 @@
+/*
+ * max77686.h - Driver for the Maxim 77686
+ *
+ *  Copyright (C) 2011 Samsung Electrnoics
+ *  Chiwoong Byun <woong.byun@xxxxxxxxxxx>
+ *  Yadwinder Singh Brar <yadi.brar@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This driver is based on max8997.h
+ *
+ * MAX77686 has PMIC, RTC devices.
+ * The devices share the same I2C bus and included in
+ * this mfd driver.
+ */
+
+#ifndef __LINUX_MFD_MAX77686_H
+#define __LINUX_MFD_MAX77686_H
+
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/of_regulator.h>
+
+/* MAX77686 regulator IDs */
+enum max77686_regulators {
+	MAX77686_LDO1 = 0,
+	MAX77686_LDO2,
+	MAX77686_LDO3,
+	MAX77686_LDO4,
+	MAX77686_LDO5,
+	MAX77686_LDO6,
+	MAX77686_LDO7,
+	MAX77686_LDO8,
+	MAX77686_LDO9,
+	MAX77686_LDO10,
+	MAX77686_LDO11,
+	MAX77686_LDO12,
+	MAX77686_LDO13,
+	MAX77686_LDO14,
+	MAX77686_LDO15,
+	MAX77686_LDO16,
+	MAX77686_LDO17,
+	MAX77686_LDO18,
+	MAX77686_LDO19,
+	MAX77686_LDO20,
+	MAX77686_LDO21,
+	MAX77686_LDO22,
+	MAX77686_LDO23,
+	MAX77686_LDO24,
+	MAX77686_LDO25,
+	MAX77686_LDO26,
+	MAX77686_BUCK1,
+	MAX77686_BUCK2,
+	MAX77686_BUCK3,
+	MAX77686_BUCK4,
+	MAX77686_BUCK5,
+	MAX77686_BUCK6,
+	MAX77686_BUCK7,
+	MAX77686_BUCK8,
+	MAX77686_BUCK9,
+	MAX77686_EN32KHZ_AP,
+	MAX77686_EN32KHZ_CP,
+	MAX77686_P32KH,
+
+	MAX77686_REG_MAX,
+};
+
+enum max77686_ramp_rate {
+	MAX77686_RAMP_RATE_13MV = 1,
+	MAX77686_RAMP_RATE_27MV,	/* default */
+	MAX77686_RAMP_RATE_55MV,
+	MAX77686_RAMP_RATE_100MV,
+};
+
+struct max77686_platform_data {
+	bool wakeup;
+	u8 ramp_delay;
+	struct of_regulator_match *regulators;
+	int num_regulators;
+	struct max77686_opmode_data *opmode_data;
+
+	/*
+	 * GPIO-DVS feature is not enabled with the current version of
+	 * MAX77686 driver. Buck2/3/4_voltages[0] is used as the default
+	 * voltage at probe.
+	 */
+};
+
+#endif /* __LINUX_MFD_MAX77686_H */
-- 
1.7.0.4

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