Date:	Fri, 11 May 2012 15:36:16 +0900
From:	Jonghwa Lee <jonghwa3.lee@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	Samuel Oritz <sameo@...ux.intel.com>,
	Liam Girdwood <trg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	kyungmin.park@...sung.com, myungjoo.ham@...sung.com,
	cw00.choi@...sung.com, Jonghwa Lee <jonghwa3.lee@...sung.com>,
	Chiwoong Byun <woong.byun@...sung.com>
Subject: [PATCH 2/3] regulator: MAX77686: Add Maxim 77686 regulator driver

Add driver for support max77686 regulator.
MAX77686 provides LDOs[1~26] and BUCKs[1~9]. It support to set or get the
volatege of regulator on max77686 chip with using regmap.

Signed-off-by: Chiwoong Byun <woong.byun@...sung.com>
Signed-off-by: Jonghwa Lee <jonghwa3.lee@...sung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 drivers/regulator/Kconfig    |    8 +
 drivers/regulator/Makefile   |    1 +
 drivers/regulator/max77686.c |  809 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 818 insertions(+), 0 deletions(-)
 create mode 100644 drivers/regulator/max77686.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 36db5a4..8e2ebad 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -195,6 +195,14 @@ config REGULATOR_MAX8998
 	  via I2C bus. The provided regulator is suitable for S3C6410
 	  and S5PC1XX chips to control VCC_CORE and VCC_USIM voltages.
 
+config REGULATOR_MAX77686
+	tristate "Maxim 77686 regulator"
+	depends on MFD_MAX77686
+	help
+	  This driver controls a Maxim 77686 regulator
+	  via I2C bus. The provided regulator is suitable for
+	  Exynos-4 chips to control VARM and VINT voltages.
+
 config REGULATOR_PCAP
 	tristate "Motorola PCAP2 regulator driver"
 	depends on EZX_PCAP
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 94b5274..008931b 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_REGULATOR_MAX8925) += max8925-regulator.o
 obj-$(CONFIG_REGULATOR_MAX8952) += max8952.o
 obj-$(CONFIG_REGULATOR_MAX8997) += max8997.o
 obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
+obj-$(CONFIG_REGULATOR_MAX77686) += max77686.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
 obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
 obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
diff --git a/drivers/regulator/max77686.c b/drivers/regulator/max77686.c
new file mode 100644
index 0000000..9ab7a4c
--- /dev/null
+++ b/drivers/regulator/max77686.c
@@ -0,0 +1,809 @@
+/*
+ * max77686.c - Regulator driver for the Maxim 77686
+ *
+ * Copyright (C) 2012 Samsung Electronics
+ * Chiwoong Byun <woong.byun@...sung.com>
+ * Jonghwa Lee <jonghwa3.lee@...sung.com>
+ *
+ * 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
+ */
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/max77686.h>
+#include <linux/mfd/max77686-private.h>
+
+#define PMIC_DEBUG KERN_INFO
+#define PMIC_REG_DEBUG KERN_DEBUG
+
+#define MAX77686_OPMODE_SHIFT 6
+#define MAX77686_OPMODE_BUCK234_SHIFT 4
+#define MAX77686_OPMODE_MASK 0x3
+
+struct max77686_data {
+	struct device *dev;
+	struct max77686_dev *iodev;
+	int num_regulators;
+	struct regulator_dev **rdev;
+	int ramp_delay; /* in mV/us */
+
+	struct max77686_opmode_data *opmode_data;
+
+	bool buck2_gpiodvs;
+	bool buck3_gpiodvs;
+	bool buck4_gpiodvs;
+	u8 buck2_vol[8];
+	u8 buck3_vol[8];
+	u8 buck4_vol[8];
+	int buck234_gpios_dvs[3];
+	int buck234_gpios_selb[3];
+	int buck234_gpioindex;
+	bool ignore_gpiodvs_side_effect;
+
+	u8 saved_states[MAX77686_REG_MAX];
+};
+
+static inline void max77686_set_gpio(struct max77686_data *max77686)
+{
+	int set3 = (max77686->buck234_gpioindex) & 0x1;
+	int set2 = ((max77686->buck234_gpioindex) >> 1) & 0x1;
+	int set1 = ((max77686->buck234_gpioindex) >> 2) & 0x1;
+
+	if (max77686->buck234_gpios_dvs[0])
+		gpio_set_value(max77686->buck234_gpios_dvs[0], set1);
+	if (max77686->buck234_gpios_dvs[1])
+		gpio_set_value(max77686->buck234_gpios_dvs[1], set2);
+	if (max77686->buck234_gpios_dvs[2])
+		gpio_set_value(max77686->buck234_gpios_dvs[2], set3);
+}
+
+struct voltage_map_desc {
+	int min;
+	int max;
+	int step;
+	unsigned int n_bits;
+};
+
+/* LDO3 ~ 5, 9 ~ 14, 16 ~ 26 (uV) */
+static const struct voltage_map_desc ldo_voltage_map_desc = {
+	.min = 800000,	.max = 3950000,	.step = 50000,	.n_bits = 6,
+};
+
+/* LDO1 ~ 2, 6 ~ 8, 15 (uV) */
+static const struct voltage_map_desc ldo_low_voltage_map_desc = {
+	.min = 800000,	.max = 2375000,	.step = 25000,	.n_bits = 6,
+};
+
+/* Buck2, 3, 4 (uV) */
+static const struct voltage_map_desc buck_dvs_voltage_map_desc = {
+	.min = 600000,	.max = 3787500,	.step = 12500,	.n_bits = 8,
+};
+
+/* Buck1, 5 ~ 9 (uV) */
+static const struct voltage_map_desc buck_voltage_map_desc = {
+	.min = 750000,	.max = 3900000,	.step = 50000,	.n_bits = 6,
+};
+
+static const struct voltage_map_desc *reg_voltage_map[] = {
+	[MAX77686_LDO1] = &ldo_low_voltage_map_desc,
+	[MAX77686_LDO2] = &ldo_low_voltage_map_desc,
+	[MAX77686_LDO3] = &ldo_voltage_map_desc,
+	[MAX77686_LDO4] = &ldo_voltage_map_desc,
+	[MAX77686_LDO5] = &ldo_voltage_map_desc,
+	[MAX77686_LDO6] = &ldo_low_voltage_map_desc,
+	[MAX77686_LDO7] = &ldo_low_voltage_map_desc,
+	[MAX77686_LDO8] = &ldo_low_voltage_map_desc,
+	[MAX77686_LDO9] = &ldo_voltage_map_desc,
+	[MAX77686_LDO10] = &ldo_voltage_map_desc,
+	[MAX77686_LDO11] = &ldo_voltage_map_desc,
+	[MAX77686_LDO12] = &ldo_voltage_map_desc,
+	[MAX77686_LDO13] = &ldo_voltage_map_desc,
+	[MAX77686_LDO14] = &ldo_voltage_map_desc,
+	[MAX77686_LDO15] = &ldo_low_voltage_map_desc,
+	[MAX77686_LDO16] = &ldo_voltage_map_desc,
+	[MAX77686_LDO17] = &ldo_voltage_map_desc,
+	[MAX77686_LDO18] = &ldo_voltage_map_desc,
+	[MAX77686_LDO19] = &ldo_voltage_map_desc,
+	[MAX77686_LDO20] = &ldo_voltage_map_desc,
+	[MAX77686_LDO21] = &ldo_voltage_map_desc,
+	[MAX77686_LDO22] = &ldo_voltage_map_desc,
+	[MAX77686_LDO23] = &ldo_voltage_map_desc,
+	[MAX77686_LDO24] = &ldo_voltage_map_desc,
+	[MAX77686_LDO25] = &ldo_voltage_map_desc,
+	[MAX77686_LDO26] = &ldo_voltage_map_desc,
+	[MAX77686_BUCK1] = &buck_voltage_map_desc,
+	[MAX77686_BUCK2] = &buck_dvs_voltage_map_desc,
+	[MAX77686_BUCK3] = &buck_dvs_voltage_map_desc,
+	[MAX77686_BUCK4] = &buck_dvs_voltage_map_desc,
+	[MAX77686_BUCK5] = &buck_voltage_map_desc,
+	[MAX77686_BUCK6] = &buck_voltage_map_desc,
+	[MAX77686_BUCK7] = &buck_voltage_map_desc,
+	[MAX77686_BUCK8] = &buck_voltage_map_desc,
+	[MAX77686_BUCK9] = &buck_voltage_map_desc,
+	[MAX77686_EN32KHZ_AP] = NULL,
+	[MAX77686_EN32KHZ_CP] = NULL,
+	[MAX77686_P32KH] = NULL,
+};
+
+static int max77686_list_voltage(struct regulator_dev *rdev,
+		unsigned int selector)
+{
+	const struct voltage_map_desc *desc;
+	int rid = rdev_get_id(rdev);
+	int val;
+
+	if (rid >= ARRAY_SIZE(reg_voltage_map) ||
+			rid < 0)
+		return -EINVAL;
+
+	desc = reg_voltage_map[rid];
+	if (desc == NULL)
+		return -EINVAL;
+
+	val = desc->min + desc->step * selector;
+	if (val > desc->max)
+		return -EINVAL;
+
+	return val;
+}
+
+/*
+ * TODO
+ * Reaction to the LP/Standby for each regulator should be defined by
+ * each consumer, not by the regulator device driver if it depends
+ * on which device is attached to which regulator. Here we are
+ * creating possible PM-wise regression with board changes.Also,
+ * we can do the same effect without creating issues with board
+ * changes by carefully defining .state_mem at bsp and suspend ops
+ * callbacks.
+ */
+unsigned int max77686_opmode_reg[][3] = {
+	/* LDO1 ... LDO26 */
+	/* {NORMAL, LP, STANDBY} */
+	{0x3, 0x2, 0x2}, /* LDO1 */
+	{0x3, 0x2, 0x1},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x1},
+	{0x3, 0x2, 0x1},
+	{0x3, 0x2, 0x1},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x1},
+	{0x3, 0x2, 0x1}, /* LDO11 */
+	{0x3, 0x2, 0x1},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x1},
+	{0x3, 0x2, 0x1},
+	{0x3, 0x2, 0x1},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x2}, /* LDO21 */
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x2},
+	{0x3, 0x2, 0x2},
+	/* BUCK1 ... BUCK9 */
+	{0x3, 0x2, 0x1}, /* BUCK1 */
+	{0x3, 0x2, 0x1},
+	{0x3, 0x2, 0x1},
+	{0x3, 0x2, 0x1},
+	{0x3, 0x3, 0x3},
+	{0x3, 0x3, 0x3},
+	{0x3, 0x3, 0x3},
+	{0x3, 0x3, 0x3},
+	{0x3, 0x3, 0x3},
+	/* 32KHZ */
+	{0x1, 0x1, 0x1},
+	{0x1, 0x1, 0x1},
+	{0x1, 0x1, 0x1},
+};
+
+static int max77686_get_enable_register(struct regulator_dev *rdev,
+		int *reg, int *mask, int *pattern)
+{
+	unsigned int rid = rdev_get_id(rdev);
+	unsigned int mode;
+	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+
+	if (rid > ARRAY_SIZE(max77686_opmode_reg))
+		return -EINVAL;
+
+	mode = max77686->opmode_data[rid].mode;
+	pr_debug("rid=%d, mode=%d, size=%d\n",
+		 rid, mode, ARRAY_SIZE(max77686_opmode_reg));
+
+	switch (rid) {
+	case MAX77686_LDO1 ... MAX77686_LDO26:
+		*reg = MAX77686_REG_LDO1CTRL1 + (rid - MAX77686_LDO1);
+		*mask = MAX77686_OPMODE_MASK << MAX77686_OPMODE_SHIFT;
+		*pattern = max77686_opmode_reg[rid][mode] << MAX77686_OPMODE_SHIFT;
+		break;
+	case MAX77686_BUCK1:
+		*reg = MAX77686_REG_BUCK1CTRL;
+		*mask = MAX77686_OPMODE_MASK;
+		*pattern = max77686_opmode_reg[rid][mode];
+		break;
+	case MAX77686_BUCK2:
+	case MAX77686_BUCK3:
+	case MAX77686_BUCK4:
+		*reg = MAX77686_REG_BUCK2CTRL1 + (rid - MAX77686_BUCK2)*10;
+		*mask = MAX77686_OPMODE_MASK << MAX77686_OPMODE_BUCK234_SHIFT;
+		*pattern = max77686_opmode_reg[rid][mode] << MAX77686_OPMODE_BUCK234_SHIFT;
+		break;
+	case MAX77686_BUCK5 ... MAX77686_BUCK9:
+		*reg = MAX77686_REG_BUCK5CTRL + (rid - MAX77686_BUCK5) * 2;
+		*mask = MAX77686_OPMODE_MASK;
+		*pattern = max77686_opmode_reg[rid][mode];
+		break;
+	case MAX77686_EN32KHZ_AP ... MAX77686_P32KH:
+		*reg = MAX77686_REG_32KHZ;
+		*mask = 0x01 << (rid - MAX77686_EN32KHZ_AP);
+		*pattern = 0x01 << (rid - MAX77686_EN32KHZ_AP);
+		break;
+	default:
+		/* Not controllable or not exists */
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max77686_reg_is_enabled(struct regulator_dev *rdev)
+{
+	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+	int ret, reg, mask, pattern;
+	u8 val;
+
+	ret = max77686_get_enable_register(rdev, &reg, &mask, &pattern);
+	if (ret == -EINVAL)
+		return 1; /* "not controllable" */
+	else if (ret)
+		return ret;
+
+
+	ret = max77686_read_reg(max77686->iodev->regmap, reg, &val);
+	
+	if (ret)
+		return ret;
+
+	pr_debug("id=%d, ret=%d, val=%x, mask=%x, pattern=%x\n",
+		 rdev_get_id(rdev), (val & mask) == pattern,
+		 val, mask, pattern);
+
+	return (val & mask) == pattern;
+}
+
+static int max77686_reg_enable(struct regulator_dev *rdev)
+{
+	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+	int ret, reg, mask, pattern;
+
+	ret = max77686_get_enable_register(rdev, &reg, &mask, &pattern);
+	if (ret)
+		return ret;
+
+	printk(PMIC_DEBUG "%s: id=%d, pattern=%x\n",
+		__func__, rdev_get_id(rdev), pattern);
+
+	return max77686_update_reg(max77686->iodev->regmap, reg, pattern, mask);
+}
+
+static int max77686_reg_disable(struct regulator_dev *rdev)
+{
+	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+	int ret, reg, mask, pattern;
+
+	ret = max77686_get_enable_register(rdev, &reg, &mask, &pattern);
+	if (ret)
+		return ret;
+
+	printk(PMIC_DEBUG "%s: id=%d, pattern=%x\n",
+		__func__, rdev_get_id(rdev), pattern);
+
+	return max77686_update_reg(max77686->iodev->regmap, reg, ~mask, mask);
+}
+
+static int max77686_get_voltage_register(struct regulator_dev *rdev,
+		int *_reg, int *_shift, int *_mask)
+{
+	int rid = rdev_get_id(rdev);
+	int reg, shift = 0, mask = 0x3f;
+
+	switch (rid) {
+	case MAX77686_LDO1 ... MAX77686_LDO26:
+		reg = MAX77686_REG_LDO1CTRL1 + (rid - MAX77686_LDO1);
+		break;
+	case MAX77686_BUCK1:
+		reg = MAX77686_REG_BUCK1OUT;
+		break;
+	case MAX77686_BUCK2:
+		reg = MAX77686_REG_BUCK2DVS1;
+		mask = 0xff;
+		break;
+	case MAX77686_BUCK3:
+		reg = MAX77686_REG_BUCK3DVS1;
+		mask = 0xff;
+		break;
+	case MAX77686_BUCK4:
+		reg = MAX77686_REG_BUCK4DVS1;
+		mask = 0xff;
+		break;
+	case MAX77686_BUCK5 ... MAX77686_BUCK9:
+		reg = MAX77686_REG_BUCK5OUT + (rid - MAX77686_BUCK5) * 2;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	*_reg = reg;
+	*_shift = shift;
+	*_mask = mask;
+
+	return 0;
+}
+
+static int max77686_get_voltage(struct regulator_dev *rdev)
+{
+	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+	int reg, shift, mask, ret;
+	int rid = rdev_get_id(rdev);
+	u8 val;
+
+	ret = max77686_get_voltage_register(rdev, &reg, &shift, &mask);
+	if (ret)
+		return ret;
+
+	if ((rid == MAX77686_BUCK2 && max77686->buck2_gpiodvs) ||
+	    (rid == MAX77686_BUCK3 && max77686->buck3_gpiodvs) ||
+	    (rid == MAX77686_BUCK4 && max77686->buck4_gpiodvs))
+		reg += max77686->buck234_gpioindex;
+
+	ret = max77686_read_reg(max77686->iodev->regmap, reg, &val);
+	if (ret)
+		return ret;
+
+	val >>= shift;
+	val &= mask;
+
+	printk(PMIC_REG_DEBUG "%s: id=%d, reg=%x, mask=%x, val=%x\n",
+		__func__, rid, reg, mask, val);
+
+	return max77686_list_voltage(rdev, val);
+}
+
+static inline int max77686_get_voltage_proper_val(
+		const struct voltage_map_desc *desc,
+		int min_vol, int max_vol)
+{
+	int i = 0;
+
+	if (desc == NULL)
+		return -EINVAL;
+
+	if (max_vol < desc->min || min_vol > desc->max)
+		return -EINVAL;
+
+	while (desc->min + desc->step * i < min_vol &&
+			desc->min + desc->step * i < desc->max)
+		i++;
+
+	if (desc->min + desc->step * i > max_vol)
+		return -EINVAL;
+
+	if (i >= (1 << desc->n_bits))
+		return -EINVAL;
+
+	return i;
+}
+
+static int max77686_set_voltage(struct regulator_dev *rdev,
+		int min_uV, int max_uV, unsigned *selector)
+{
+	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+	const struct voltage_map_desc *desc;
+	int rid = rdev_get_id(rdev);
+	int reg, shift = 0, mask, ret;
+	int i;
+	u8 org;
+
+	desc = reg_voltage_map[rid];
+
+	i = max77686_get_voltage_proper_val(desc, min_uV, max_uV);
+	if (i < 0)
+		return i;
+
+	ret = max77686_get_voltage_register(rdev, &reg, &shift, &mask);
+	if (ret)
+		return ret;
+
+	/* TODO: If GPIO-DVS is being used, this won't work. */
+
+	max77686_read_reg(max77686->iodev->regmap, reg, &org);
+	org = (org & mask) >> shift;
+
+	ret = max77686_update_reg(max77686->iodev->regmap, reg, i << shift, mask << shift);
+	*selector = i;
+
+	switch (rid) {
+	case MAX77686_BUCK2 ... MAX77686_BUCK4:
+		if (org < i)
+			udelay(DIV_ROUND_UP(desc->step * (i - org),
+						max77686->ramp_delay * 1000));
+		break;
+	case MAX77686_BUCK1:
+	case MAX77686_BUCK5 ... MAX77686_BUCK9:
+		/* Unconditionally 100 mV/us */
+		if (org < i)
+			udelay(DIV_ROUND_UP(desc->step * (i - org), 100000));
+		break;
+	default:
+		break;
+	}
+
+	printk(PMIC_REG_DEBUG "%s: id=%d, reg=%x, mask=%x, org=%x, val=%x\n",
+		__func__, rdev_get_id(rdev), reg, mask, org, i);
+
+	return ret;
+}
+
+static int max77686_reg_do_nothing(struct regulator_dev *rdev)
+{
+	return 0;
+}
+
+static struct regulator_ops max77686_ldo_ops = {
+	.list_voltage		= max77686_list_voltage,
+	.is_enabled		= max77686_reg_is_enabled,
+	.enable			= max77686_reg_enable,
+	.disable		= max77686_reg_disable,
+	.get_voltage		= max77686_get_voltage,
+	.set_voltage		= max77686_set_voltage,
+	/* TODO: set 0xC0 -> 0x40 with suspend_enable. for 0x0, ->0x0 */
+	.set_suspend_enable	= max77686_reg_do_nothing,
+	/* LDO's ON(0xC0) means "ON at normal, OFF at suspend" */
+	.set_suspend_disable	= max77686_reg_do_nothing,
+};
+
+static struct regulator_ops max77686_buck_ops = {
+	.list_voltage		= max77686_list_voltage,
+	.is_enabled		= max77686_reg_is_enabled,
+	.enable			= max77686_reg_enable,
+	.disable		= max77686_reg_disable,
+	.get_voltage		= max77686_get_voltage,
+	.set_voltage		= max77686_set_voltage,
+	/* Interpret suspend_enable as "keep on if it was enabled." */
+	.set_suspend_enable	= max77686_reg_do_nothing,
+	.set_suspend_disable	= max77686_reg_disable,
+};
+
+static struct regulator_ops max77686_fixedvolt_ops = {
+	.list_voltage		= max77686_list_voltage,
+	.is_enabled		= max77686_reg_is_enabled,
+	.enable			= max77686_reg_enable,
+	.disable		= max77686_reg_disable,
+	/* Interpret suspend_enable as "keep on if it was enabled." */
+	.set_suspend_enable	= max77686_reg_do_nothing,
+	.set_suspend_disable	= max77686_reg_disable,
+};
+
+#define regulator_desc_ldo(num)		{	\
+	.name		= "LDO"#num,		\
+	.id		= MAX77686_LDO##num,	\
+	.ops		= &max77686_ldo_ops,	\
+	.type		= REGULATOR_VOLTAGE,	\
+	.owner		= THIS_MODULE,		\
+}
+#define regulator_desc_buck(num)		{	\
+	.name		= "BUCK"#num,		\
+	.id		= MAX77686_BUCK##num,	\
+	.ops		= &max77686_buck_ops,	\
+	.type		= REGULATOR_VOLTAGE,	\
+	.owner		= THIS_MODULE,		\
+}
+
+static struct regulator_desc regulators[] = {
+	regulator_desc_ldo(1),
+	regulator_desc_ldo(2),
+	regulator_desc_ldo(3),
+	regulator_desc_ldo(4),
+	regulator_desc_ldo(5),
+	regulator_desc_ldo(6),
+	regulator_desc_ldo(7),
+	regulator_desc_ldo(8),
+	regulator_desc_ldo(9),
+	regulator_desc_ldo(10),
+	regulator_desc_ldo(11),
+	regulator_desc_ldo(12),
+	regulator_desc_ldo(13),
+	regulator_desc_ldo(14),
+	regulator_desc_ldo(15),
+	regulator_desc_ldo(16),
+	regulator_desc_ldo(17),
+	regulator_desc_ldo(18),
+	regulator_desc_ldo(19),
+	regulator_desc_ldo(20),
+	regulator_desc_ldo(21),
+	regulator_desc_ldo(22),
+	regulator_desc_ldo(23),
+	regulator_desc_ldo(24),
+	regulator_desc_ldo(25),
+	regulator_desc_ldo(26),
+	regulator_desc_buck(1),
+	regulator_desc_buck(2),
+	regulator_desc_buck(3),
+	regulator_desc_buck(4),
+	regulator_desc_buck(5),
+	regulator_desc_buck(6),
+	regulator_desc_buck(7),
+	regulator_desc_buck(8),
+	regulator_desc_buck(9),
+	{
+		.name	= "EN32KHz AP",
+		.id	= MAX77686_EN32KHZ_AP,
+		.ops	= &max77686_fixedvolt_ops,
+		.type	= REGULATOR_VOLTAGE,
+		.owner	= THIS_MODULE,
+	}, {
+		.name	= "EN32KHz CP",
+		.id	= MAX77686_EN32KHZ_CP,
+		.ops	= &max77686_fixedvolt_ops,
+		.type	= REGULATOR_VOLTAGE,
+		.owner	= THIS_MODULE,
+	}, {
+		.name	= "EN32KHz PMIC",
+		.id	= MAX77686_P32KH,
+		.ops	= &max77686_fixedvolt_ops,
+		.type	= REGULATOR_VOLTAGE,
+		.owner	= THIS_MODULE,
+	},
+};
+
+static __devinit int max77686_pmic_probe(struct platform_device *pdev)
+{
+	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+	struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
+	struct regulator_dev **rdev;
+	struct max77686_data *max77686;
+	struct i2c_client *i2c;
+	int i, ret, size;
+	u8 data = 0;
+
+	printk(PMIC_DEBUG "%s\n", __func__);
+
+	if (!pdata) {
+		dev_err(pdev->dev.parent, "No platform init data supplied.\n");
+		return -ENODEV;
+	}
+
+	max77686 = kzalloc(sizeof(struct max77686_data), GFP_KERNEL);
+	if (!max77686)
+		return -ENOMEM;
+
+	size = sizeof(struct regulator_dev *) * pdata->num_regulators;
+	max77686->rdev = kzalloc(size, GFP_KERNEL);
+	if (!max77686->rdev) {
+		kfree(max77686);
+		return -ENOMEM;
+	}
+
+	rdev = max77686->rdev;
+	max77686->dev = &pdev->dev;
+	max77686->iodev = iodev;
+	max77686->num_regulators = pdata->num_regulators;
+	platform_set_drvdata(pdev, max77686);
+	i2c = max77686->iodev->i2c;
+
+	max77686->opmode_data = pdata->opmode_data;
+
+	max77686->ramp_delay = 100; /* Set 0x3 for RAMP */
+	max77686_update_reg(max77686->iodev->regmap, MAX77686_REG_BUCK2CTRL1, 0xC0, 0xC0);
+	max77686_update_reg(max77686->iodev->regmap, MAX77686_REG_BUCK3CTRL1, 0xC0, 0xC0);
+	max77686_update_reg(max77686->iodev->regmap, MAX77686_REG_BUCK4CTRL1, 0xC0, 0xC0);
+
+	max77686_read_reg(max77686->iodev->regmap, MAX77686_REG_DEVICE_ID, &data);
+	printk(PMIC_DEBUG "%s: DEVICE ID=0x%x\n", __func__, data);
+
+	/*
+	 * TODO
+	 * This disables GPIO-DVS. Later we may need to implement GPIO-DVS..
+	 * or we do not?
+	 */
+	max77686->buck2_gpiodvs = false;
+	max77686->buck3_gpiodvs = false;
+	max77686->buck4_gpiodvs = false;
+	for (i = 0; i < 3; i++) {
+		char buf[80];
+
+		sprintf(buf, "MAX77686 DVS%d", i);
+
+		if (gpio_is_valid(pdata->buck234_gpio_dvs[i])) {
+			max77686->buck234_gpios_dvs[i] =
+				pdata->buck234_gpio_dvs[i];
+			gpio_request(pdata->buck234_gpio_dvs[i], buf);
+			gpio_direction_output(pdata->buck234_gpio_dvs[i], 0);
+		} else {
+			dev_info(&pdev->dev, "GPIO %s ignored (%d)\n",
+				 buf, pdata->buck234_gpio_dvs[i]);
+		}
+
+		sprintf(buf, "MAX77686 SELB%d", i);
+
+		if (gpio_is_valid(pdata->buck234_gpio_selb[i])) {
+			max77686->buck234_gpios_selb[i] =
+				pdata->buck234_gpio_selb[i];
+			gpio_request(pdata->buck234_gpio_selb[i], buf);
+			gpio_direction_output(pdata->buck234_gpio_selb[i], 0);
+		} else {
+			dev_info(&pdev->dev, "GPIO %s ignored (%d)\n",
+				 buf, pdata->buck234_gpio_dvs[i]);
+		}
+	}
+	max77686->buck234_gpioindex = 0;
+
+	for (i = 0; i < 8; i++) {
+		ret = max77686_get_voltage_proper_val(
+				&buck_dvs_voltage_map_desc,
+				pdata->buck2_voltage[i],
+				pdata->buck2_voltage[i]
+					+ buck_dvs_voltage_map_desc.step);
+		/* 1.1V as default for safety */
+		if (ret < 0)
+			max77686->buck2_vol[i] = 0x28;
+		else
+			max77686->buck2_vol[i] = ret;
+		max77686_write_reg(max77686->iodev->regmap, MAX77686_REG_BUCK2DVS1 + i,
+				   max77686->buck2_vol[i]);
+
+		ret = max77686_get_voltage_proper_val(
+				&buck_dvs_voltage_map_desc,
+				pdata->buck3_voltage[i],
+				pdata->buck3_voltage[i]
+					+ buck_dvs_voltage_map_desc.step);
+		/* 1.1V as default for safety */
+		if (ret < 0)
+			max77686->buck3_vol[i] = 0x28;
+		else
+			max77686->buck3_vol[i] = ret;
+		max77686_write_reg(max77686->iodev->regmap, MAX77686_REG_BUCK3DVS1 + i,
+				   max77686->buck3_vol[i]);
+		ret = max77686_get_voltage_proper_val(
+				&buck_dvs_voltage_map_desc,
+				pdata->buck4_voltage[i],
+				pdata->buck4_voltage[i]
+					+ buck_dvs_voltage_map_desc.step);
+		/* 1.1V as default for safety */
+		if (ret < 0)
+			max77686->buck4_vol[i] = 0x28;
+		else
+			max77686->buck4_vol[i] = ret;
+		max77686_write_reg(max77686->iodev->regmap, MAX77686_REG_BUCK4DVS1 + i,
+				   max77686->buck4_vol[i]);
+	}
+
+
+	for (i = 0; i < pdata->num_regulators; i++) {
+		const struct voltage_map_desc *desc;
+		int id = pdata->regulators[i].id;
+
+		desc = reg_voltage_map[id];
+		if (desc) {
+			regulators[id].n_voltages =
+				(desc->max - desc->min) / desc->step + 1;
+
+			printk(PMIC_DEBUG "%s: desc=%p, id=%d, n_vol=%d, max=%d, min=%d, step=%d\n",
+					__func__, desc, id, regulators[id].n_voltages,
+					desc->max, desc->min, desc->step);
+		}
+
+		rdev[i] = regulator_register(&regulators[id], max77686->dev,
+					     pdata->regulators[i].initdata,
+					     max77686, NULL);
+		if (IS_ERR(rdev[i])) {
+			ret = PTR_ERR(rdev[i]);
+			dev_err(max77686->dev, "regulator init failed for %d\n",
+					id);
+			rdev[i] = NULL;
+			goto err;
+		}
+	}
+
+	return 0;
+err:
+	for (i = 0; i < 3; i++) {
+		if (max77686->buck234_gpios_dvs[i])
+			gpio_free(max77686->buck234_gpios_dvs[i]);
+		if (max77686->buck234_gpios_dvs[i])
+			gpio_free(max77686->buck234_gpios_selb[i]);
+	}
+
+	for (i = 0; i < max77686->num_regulators; i++)
+		if (rdev[i])
+			regulator_unregister(rdev[i]);
+
+	kfree(max77686->rdev);
+	kfree(max77686);
+
+	return ret;
+}
+
+static int __devexit max77686_pmic_remove(struct platform_device *pdev)
+{
+	struct max77686_data *max77686 = platform_get_drvdata(pdev);
+	struct regulator_dev **rdev = max77686->rdev;
+	int i;
+
+	for (i = 0; i < 3; i++) {
+		if (max77686->buck234_gpios_dvs[i])
+			gpio_free(max77686->buck234_gpios_dvs[i]);
+		if (max77686->buck234_gpios_dvs[i])
+			gpio_free(max77686->buck234_gpios_selb[i]);
+	}
+
+	for (i = 0; i < max77686->num_regulators; i++)
+		if (rdev[i])
+			regulator_unregister(rdev[i]);
+
+	kfree(max77686->rdev);
+	kfree(max77686);
+
+	return 0;
+}
+
+static const struct platform_device_id max77686_pmic_id[] = {
+	{ "max77686-pmic", 0},
+	{ },
+};
+MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
+
+static struct platform_driver max77686_pmic_driver = {
+	.driver = {
+		.name = "max77686-pmic",
+		.owner = THIS_MODULE,
+	},
+	.probe = max77686_pmic_probe,
+	.remove = __devexit_p(max77686_pmic_remove),
+	.id_table = max77686_pmic_id,
+};
+
+static int __init max77686_pmic_init(void)
+{
+	printk(PMIC_DEBUG "%s\n", __func__);
+
+	return platform_driver_register(&max77686_pmic_driver);
+}
+subsys_initcall(max77686_pmic_init);
+
+static void __exit max77686_pmic_cleanup(void)
+{
+	platform_driver_unregister(&max77686_pmic_driver);
+}
+module_exit(max77686_pmic_cleanup);
+
+MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
+MODULE_AUTHOR("Chiwoong Byun <woong.byun@...sung.com>");
+MODULE_LICENSE("GPL");
-- 
1.7.4.1

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