regulator: Add driver for max77802 PMIC PMIC regulators

The MAX77802 PMIC has 10 high-efficiency Buck and 32 Low-dropout
(LDO) regulators. This patch adds support for all these regulators
found on the MAX77802 PMIC and is based on a driver added by Simon
Glass to the Chrome OS kernel 3.8 tree.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/regulator/Kconfig

@@ -387,6 +387,15 @@ config REGULATOR_MAX77693
 	  and one current regulator 'CHARGER'. This is suitable for
 	  Exynos-4x12 chips.
 
+config REGULATOR_MAX77802
+	tristate "Maxim 77802 regulator"
+	depends on MFD_MAX77686
+	help
+	  This driver controls a Maxim 77802 regulator
+	  via I2C bus. The provided regulator is suitable for
+	  Exynos5420/Exynos5800 SoCs to control various voltages.
+	  It includes support for control of voltage and ramp speed.
+
 config REGULATOR_MC13XXX_CORE
 	tristate
 

drivers/regulator/Makefile

@@ -52,6 +52,7 @@ obj-$(CONFIG_REGULATOR_MAX8997) += max8997.o
 obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
 obj-$(CONFIG_REGULATOR_MAX77686) += max77686.o
 obj-$(CONFIG_REGULATOR_MAX77693) += max77693.o
+obj-$(CONFIG_REGULATOR_MAX77802) += max77802.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
 obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
 obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o

drivers/regulator/max77802.c

@@ -0,0 +1,578 @@
+/*
+ * max77802.c - Regulator driver for the Maxim 77802
+ *
+ * Copyright (C) 2013-2014 Google, Inc
+ * Simon Glass <sjg@chromium.org>
+ *
+ * Copyright (C) 2012 Samsung Electronics
+ * Chiwoong Byun <woong.byun@smasung.com>
+ * Jonghwa Lee <jonghwa3.lee@samsung.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.
+ *
+ * This driver is based on max8997.c
+ */
+
+#include <linux/kernel.h>
+#include <linux/bug.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/mfd/max77686.h>
+#include <linux/mfd/max77686-private.h>
+
+/* Default ramp delay in case it is not manually set */
+#define MAX77802_RAMP_DELAY		100000		/* uV/us */
+
+#define MAX77802_OPMODE_SHIFT_LDO	6
+#define MAX77802_OPMODE_BUCK234_SHIFT	4
+#define MAX77802_OPMODE_MASK		0x3
+
+#define MAX77802_VSEL_MASK		0x3F
+#define MAX77802_DVS_VSEL_MASK		0xFF
+
+#define MAX77802_RAMP_RATE_MASK_2BIT	0xC0
+#define MAX77802_RAMP_RATE_SHIFT_2BIT	6
+#define MAX77802_RAMP_RATE_MASK_4BIT	0xF0
+#define MAX77802_RAMP_RATE_SHIFT_4BIT	4
+
+/* MAX77802 has two register formats: 2-bit and 4-bit */
+static const unsigned int ramp_table_77802_2bit[] = {
+	12500,
+	25000,
+	50000,
+	100000,
+};
+
+static unsigned int ramp_table_77802_4bit[] = {
+	1000,	2000,	3030,	4000,
+	5000,	5880,	7140,	8330,
+	9090,	10000,	11110,	12500,
+	16670,	25000,	50000,	100000,
+};
+
+struct max77802_regulator_prv {
+	int num_regulators;
+	struct regulator_dev *rdev[MAX77802_REG_MAX];
+	unsigned int opmode[MAX77802_REG_MAX];
+};
+
+static int max77802_get_opmode_shift(int id)
+{
+	if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
+				     id <= MAX77802_BUCK10))
+		return 0;
+
+	if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
+		return MAX77802_OPMODE_BUCK234_SHIFT;
+
+	if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
+		return MAX77802_OPMODE_SHIFT_LDO;
+
+	return -EINVAL;
+}
+
+/*
+ * Some BUCKS supports Normal[ON/OFF] mode during suspend
+ *
+ * BUCK 1, 6, 2-4, 5, 7-10 (all)
+ *
+ * The other mode (0x02) will make PWRREQ switch between normal
+ * and low power.
+ */
+static int max77802_buck_set_suspend_disable(struct regulator_dev *rdev)
+{
+	unsigned int val = MAX77802_OPMODE_STANDBY;
+	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	int shift = max77802_get_opmode_shift(id);
+
+	max77802->opmode[id] = val;
+	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+				  rdev->desc->enable_mask, val << shift);
+}
+
+/*
+ * Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state
+ * (Enable Control Logic1 by PWRREQ)
+ *
+ * LDOs 2, 4-19, 22-35.
+ *
+ */
+static int max77802_ldo_set_suspend_mode_logic1(struct regulator_dev *rdev,
+						unsigned int mode)
+{
+	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	unsigned int val;
+	int shift = max77802_get_opmode_shift(id);
+
+	switch (mode) {
+	case REGULATOR_MODE_IDLE:			/* ON in LP Mode */
+		val = MAX77802_OPMODE_LP;
+		break;
+	case REGULATOR_MODE_NORMAL:			/* ON in Normal Mode */
+		val = MAX77802_OPMODE_NORMAL;
+		break;
+	case REGULATOR_MODE_STANDBY:			/* ON/OFF by PWRREQ */
+		val = MAX77802_OPMODE_STANDBY;
+		break;
+	default:
+		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
+			 rdev->desc->name, mode);
+		return -EINVAL;
+	}
+
+	max77802->opmode[rdev_get_id(rdev)] = val;
+	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+				  rdev->desc->enable_mask, val << shift);
+}
+
+/*
+ * Mode 1 (Output[ON/OFF] by PWRREQ) is not supported on some LDOs
+ * (Enable Control Logic2 by PWRREQ)
+ *
+ * LDOs 1, 20, 21, and 3,
+ *
+ */
+static int max77802_ldo_set_suspend_mode_logic2(struct regulator_dev *rdev,
+						unsigned int mode)
+{
+	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	unsigned int val;
+	int shift = max77802_get_opmode_shift(id);
+
+	switch (mode) {
+	case REGULATOR_MODE_IDLE:			/* ON in LP Mode */
+		val = MAX77802_OPMODE_LP;
+		break;
+	case REGULATOR_MODE_NORMAL:			/* ON in Normal Mode */
+		val = MAX77802_OPMODE_NORMAL;
+		break;
+	default:
+		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
+			 rdev->desc->name, mode);
+		return -EINVAL;
+	}
+
+	max77802->opmode[rdev_get_id(rdev)] = val;
+	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+				  rdev->desc->enable_mask, val << shift);
+}
+
+static int max77802_enable(struct regulator_dev *rdev)
+{
+	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	int shift = max77802_get_opmode_shift(id);
+
+	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+				  rdev->desc->enable_mask,
+				  max77802->opmode[id] << shift);
+}
+
+static int max77802_find_ramp_value(struct regulator_dev *rdev,
+				    const unsigned int limits[], int size,
+				    unsigned int ramp_delay)
+{
+	int i;
+
+	for (i = 0; i < size; i++) {
+		if (ramp_delay <= limits[i])
+			return i;
+	}
+
+	/* Use maximum value for no ramp control */
+	dev_warn(&rdev->dev, "%s: ramp_delay: %d not supported, setting 100000\n",
+		 rdev->desc->name, ramp_delay);
+	return size - 1;
+}
+
+/* Used for BUCKs 2-4 */
+static int max77802_set_ramp_delay_2bit(struct regulator_dev *rdev,
+					int ramp_delay)
+{
+	int id = rdev_get_id(rdev);
+	unsigned int ramp_value;
+
+	if (id > MAX77802_BUCK4) {
+			dev_warn(&rdev->dev,
+				 "%s: regulator: ramp delay not supported\n",
+				 rdev->desc->name);
+		return -EINVAL;
+	}
+	ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_2bit,
+				ARRAY_SIZE(ramp_table_77802_2bit), ramp_delay);
+
+	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+				  MAX77802_RAMP_RATE_MASK_2BIT,
+				  ramp_value << MAX77802_RAMP_RATE_SHIFT_2BIT);
+}
+
+/* For BUCK1, 6 */
+static int max77802_set_ramp_delay_4bit(struct regulator_dev *rdev,
+					    int ramp_delay)
+{
+	unsigned int ramp_value;
+
+	ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_4bit,
+				ARRAY_SIZE(ramp_table_77802_4bit), ramp_delay);
+
+	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+				  MAX77802_RAMP_RATE_MASK_4BIT,
+				  ramp_value << MAX77802_RAMP_RATE_SHIFT_4BIT);
+}
+
+/*
+ * LDOs 2, 4-19, 22-35
+ */
+static struct regulator_ops max77802_ldo_ops_logic1 = {
+	.list_voltage		= regulator_list_voltage_linear,
+	.map_voltage		= regulator_map_voltage_linear,
+	.is_enabled		= regulator_is_enabled_regmap,
+	.enable			= max77802_enable,
+	.disable		= regulator_disable_regmap,
+	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
+	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
+	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
+	.set_suspend_mode	= max77802_ldo_set_suspend_mode_logic1,
+};
+
+/*
+ * LDOs 1, 20, 21, 3
+ */
+static struct regulator_ops max77802_ldo_ops_logic2 = {
+	.list_voltage		= regulator_list_voltage_linear,
+	.map_voltage		= regulator_map_voltage_linear,
+	.is_enabled		= regulator_is_enabled_regmap,
+	.enable			= max77802_enable,
+	.disable		= regulator_disable_regmap,
+	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
+	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
+	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
+	.set_suspend_mode	= max77802_ldo_set_suspend_mode_logic2,
+};
+
+/* BUCKS 1, 6 */
+static struct regulator_ops max77802_buck_16_dvs_ops = {
+	.list_voltage		= regulator_list_voltage_linear,
+	.map_voltage		= regulator_map_voltage_linear,
+	.is_enabled		= regulator_is_enabled_regmap,
+	.enable			= max77802_enable,
+	.disable		= regulator_disable_regmap,
+	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
+	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
+	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
+	.set_ramp_delay		= max77802_set_ramp_delay_4bit,
+	.set_suspend_disable	= max77802_buck_set_suspend_disable,
+};
+
+/* BUCKs 2-4, 5, 7-10 */
+static struct regulator_ops max77802_buck_dvs_ops = {
+	.list_voltage		= regulator_list_voltage_linear,
+	.map_voltage		= regulator_map_voltage_linear,
+	.is_enabled		= regulator_is_enabled_regmap,
+	.enable			= max77802_enable,
+	.disable		= regulator_disable_regmap,
+	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
+	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
+	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
+	.set_ramp_delay		= max77802_set_ramp_delay_2bit,
+	.set_suspend_disable	= max77802_buck_set_suspend_disable,
+};
+
+/* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
+#define regulator_77802_desc_p_ldo(num, supply, log)	{		\
+	.name		= "LDO"#num,					\
+	.id		= MAX77802_LDO##num,				\
+	.supply_name	= "inl"#supply,					\
+	.ops		= &max77802_ldo_ops_logic##log,			\
+	.type		= REGULATOR_VOLTAGE,				\
+	.owner		= THIS_MODULE,					\
+	.min_uV		= 800000,					\
+	.uV_step	= 50000,					\
+	.ramp_delay	= MAX77802_RAMP_DELAY,				\
+	.n_voltages	= 1 << 6,					\
+	.vsel_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
+	.vsel_mask	= MAX77802_VSEL_MASK,				\
+	.enable_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
+	.enable_mask	= MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
+}
+
+/* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
+#define regulator_77802_desc_n_ldo(num, supply, log)   {		\
+	.name		= "LDO"#num,					\
+	.id		= MAX77802_LDO##num,				\
+	.supply_name	= "inl"#supply,					\
+	.ops		= &max77802_ldo_ops_logic##log,			\
+	.type		= REGULATOR_VOLTAGE,				\
+	.owner		= THIS_MODULE,					\
+	.min_uV		= 800000,					\
+	.uV_step	= 25000,					\
+	.ramp_delay	= MAX77802_RAMP_DELAY,				\
+	.n_voltages	= 1 << 6,					\
+	.vsel_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
+	.vsel_mask	= MAX77802_VSEL_MASK,				\
+	.enable_reg	= MAX77802_REG_LDO1CTRL1 + num - 1,		\
+	.enable_mask	= MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
+}
+
+/* BUCKs 1, 6 */
+#define regulator_77802_desc_16_buck(num)	{		\
+	.name		= "BUCK"#num,					\
+	.id		= MAX77802_BUCK##num,				\
+	.supply_name	= "inb"#num,					\
+	.ops		= &max77802_buck_16_dvs_ops,			\
+	.type		= REGULATOR_VOLTAGE,				\
+	.owner		= THIS_MODULE,					\
+	.min_uV		= 612500,					\
+	.uV_step	= 6250,						\
+	.ramp_delay	= MAX77802_RAMP_DELAY,				\
+	.n_voltages	= 1 << 8,					\
+	.vsel_reg	= MAX77802_REG_BUCK ## num ## DVS1,		\
+	.vsel_mask	= MAX77802_DVS_VSEL_MASK,			\
+	.enable_reg	= MAX77802_REG_BUCK ## num ## CTRL,		\
+	.enable_mask	= MAX77802_OPMODE_MASK,				\
+}
+
+/* BUCKS 2-4 */
+#define regulator_77802_desc_234_buck(num)	{		\
+	.name		= "BUCK"#num,					\
+	.id		= MAX77802_BUCK##num,				\
+	.supply_name	= "inb"#num,					\
+	.ops		= &max77802_buck_dvs_ops,			\
+	.type		= REGULATOR_VOLTAGE,				\
+	.owner		= THIS_MODULE,					\
+	.min_uV		= 600000,					\
+	.uV_step	= 6250,						\
+	.ramp_delay	= MAX77802_RAMP_DELAY,				\
+	.n_voltages	= 0x91,						\
+	.vsel_reg	= MAX77802_REG_BUCK ## num ## DVS1,		\
+	.vsel_mask	= MAX77802_DVS_VSEL_MASK,			\
+	.enable_reg	= MAX77802_REG_BUCK ## num ## CTRL1,		\
+	.enable_mask	= MAX77802_OPMODE_MASK <<			\
+				MAX77802_OPMODE_BUCK234_SHIFT,		\
+}
+
+/* BUCK 5 */
+#define regulator_77802_desc_buck5(num)		{		\
+	.name		= "BUCK"#num,					\
+	.id		= MAX77802_BUCK##num,				\
+	.supply_name	= "inb"#num,					\
+	.ops		= &max77802_buck_dvs_ops,			\
+	.type		= REGULATOR_VOLTAGE,				\
+	.owner		= THIS_MODULE,					\
+	.min_uV		= 750000,					\
+	.uV_step	= 50000,					\
+	.ramp_delay	= MAX77802_RAMP_DELAY,				\
+	.n_voltages	= 1 << 6,					\
+	.vsel_reg	= MAX77802_REG_BUCK5OUT,			\
+	.vsel_mask	= MAX77802_VSEL_MASK,				\
+	.enable_reg	= MAX77802_REG_BUCK5CTRL,			\
+	.enable_mask	= MAX77802_OPMODE_MASK,				\
+}
+
+/* BUCKs 7-10 */
+#define regulator_77802_desc_buck7_10(num)	{		\
+	.name		= "BUCK"#num,					\
+	.id		= MAX77802_BUCK##num,				\
+	.supply_name	= "inb"#num,					\
+	.ops		= &max77802_buck_dvs_ops,			\
+	.type		= REGULATOR_VOLTAGE,				\
+	.owner		= THIS_MODULE,					\
+	.min_uV		= 750000,					\
+	.uV_step	= 50000,					\
+	.ramp_delay	= MAX77802_RAMP_DELAY,				\
+	.n_voltages	= 1 << 6,					\
+	.vsel_reg	= MAX77802_REG_BUCK7OUT + (num - 7) * 3,	\
+	.vsel_mask	= MAX77802_VSEL_MASK,				\
+	.enable_reg	= MAX77802_REG_BUCK7CTRL + (num - 7) * 3,	\
+	.enable_mask	= MAX77802_OPMODE_MASK,				\
+}
+
+static struct regulator_desc regulators[] = {
+	regulator_77802_desc_16_buck(1),
+	regulator_77802_desc_234_buck(2),
+	regulator_77802_desc_234_buck(3),
+	regulator_77802_desc_234_buck(4),
+	regulator_77802_desc_buck5(5),
+	regulator_77802_desc_16_buck(6),
+	regulator_77802_desc_buck7_10(7),
+	regulator_77802_desc_buck7_10(8),
+	regulator_77802_desc_buck7_10(9),
+	regulator_77802_desc_buck7_10(10),
+	regulator_77802_desc_n_ldo(1, 10, 2),
+	regulator_77802_desc_n_ldo(2, 10, 1),
+	regulator_77802_desc_p_ldo(3, 3, 2),
+	regulator_77802_desc_p_ldo(4, 6, 1),
+	regulator_77802_desc_p_ldo(5, 3, 1),
+	regulator_77802_desc_p_ldo(6, 3, 1),
+	regulator_77802_desc_p_ldo(7, 3, 1),
+	regulator_77802_desc_n_ldo(8, 1, 1),
+	regulator_77802_desc_p_ldo(9, 5, 1),
+	regulator_77802_desc_p_ldo(10, 4, 1),
+	regulator_77802_desc_p_ldo(11, 4, 1),
+	regulator_77802_desc_p_ldo(12, 9, 1),
+	regulator_77802_desc_p_ldo(13, 4, 1),
+	regulator_77802_desc_p_ldo(14, 4, 1),
+	regulator_77802_desc_n_ldo(15, 1, 1),
+	regulator_77802_desc_n_ldo(17, 2, 1),
+	regulator_77802_desc_p_ldo(18, 7, 1),
+	regulator_77802_desc_p_ldo(19, 5, 1),
+	regulator_77802_desc_p_ldo(20, 7, 2),
+	regulator_77802_desc_p_ldo(21, 6, 2),
+	regulator_77802_desc_p_ldo(23, 9, 1),
+	regulator_77802_desc_p_ldo(24, 6, 1),
+	regulator_77802_desc_p_ldo(25, 9, 1),
+	regulator_77802_desc_p_ldo(26, 9, 1),
+	regulator_77802_desc_n_ldo(27, 2, 1),
+	regulator_77802_desc_p_ldo(28, 7, 1),
+	regulator_77802_desc_p_ldo(29, 7, 1),
+	regulator_77802_desc_n_ldo(30, 2, 1),
+	regulator_77802_desc_p_ldo(32, 9, 1),
+	regulator_77802_desc_p_ldo(33, 6, 1),
+	regulator_77802_desc_p_ldo(34, 9, 1),
+	regulator_77802_desc_n_ldo(35, 2, 1),
+};
+
+#ifdef CONFIG_OF
+static int max77802_pmic_dt_parse_pdata(struct platform_device *pdev,
+					struct max77686_platform_data *pdata)
+{
+	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+	struct device_node *pmic_np, *regulators_np;
+	struct max77686_regulator_data *rdata;
+	struct of_regulator_match rmatch;
+	unsigned int i;
+
+	pmic_np = iodev->dev->of_node;
+	regulators_np = of_get_child_by_name(pmic_np, "regulators");
+	if (!regulators_np) {
+		dev_err(&pdev->dev, "could not find regulators sub-node\n");
+		return -EINVAL;
+	}
+
+	pdata->num_regulators = ARRAY_SIZE(regulators);
+	rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
+			     pdata->num_regulators, GFP_KERNEL);
+	if (!rdata) {
+		of_node_put(regulators_np);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < pdata->num_regulators; i++) {
+		rmatch.name = regulators[i].name;
+		rmatch.init_data = NULL;
+		rmatch.of_node = NULL;
+		if (of_regulator_match(&pdev->dev, regulators_np, &rmatch,
+				       1) != 1) {
+			dev_warn(&pdev->dev, "No matching regulator for '%s'\n",
+				 rmatch.name);
+			continue;
+		}
+		rdata[i].initdata = rmatch.init_data;
+		rdata[i].of_node = rmatch.of_node;
+		rdata[i].id = regulators[i].id;
+	}
+
+	pdata->regulators = rdata;
+	of_node_put(regulators_np);
+
+	return 0;
+}
+#else
+static int max77802_pmic_dt_parse_pdata(struct platform_device *pdev,
+					struct max77686_platform_data *pdata)
+{
+	return 0;
+}
+#endif /* CONFIG_OF */
+
+static int max77802_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 max77802_regulator_prv *max77802;
+	int i, ret = 0, val;
+	struct regulator_config config = { };
+
+	/* This is allocated by the MFD driver */
+	if (!pdata) {
+		dev_err(&pdev->dev, "no platform data found for regulator\n");
+		return -ENODEV;
+	}
+
+	max77802 = devm_kzalloc(&pdev->dev,
+				sizeof(struct max77802_regulator_prv),
+				GFP_KERNEL);
+	if (!max77802)
+		return -ENOMEM;
+
+	if (iodev->dev->of_node) {
+		ret = max77802_pmic_dt_parse_pdata(pdev, pdata);
+		if (ret)
+			return ret;
+	}
+
+	config.dev = iodev->dev;
+	config.regmap = iodev->regmap;
+	config.driver_data = max77802;
+	platform_set_drvdata(pdev, max77802);
+
+	for (i = 0; i < MAX77802_REG_MAX; i++) {
+		struct regulator_dev *rdev;
+		int id = pdata->regulators[i].id;
+		int shift = max77802_get_opmode_shift(id);
+
+		config.init_data = pdata->regulators[i].initdata;
+		config.of_node = pdata->regulators[i].of_node;
+
+		ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
+		max77802->opmode[id] = val >> shift & MAX77802_OPMODE_MASK;
+
+		rdev = devm_regulator_register(&pdev->dev,
+					       &regulators[i], &config);
+		if (IS_ERR(rdev)) {
+			dev_err(&pdev->dev,
+				"regulator init failed for %d\n", i);
+			return PTR_ERR(rdev);
+		}
+	}
+
+	return 0;
+}
+
+static const struct platform_device_id max77802_pmic_id[] = {
+	{"max77802-pmic", 0},
+	{ },
+};
+MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
+
+static struct platform_driver max77802_pmic_driver = {
+	.driver = {
+		.name = "max77802-pmic",
+		.owner = THIS_MODULE,
+	},
+	.probe = max77802_pmic_probe,
+	.id_table = max77802_pmic_id,
+};
+
+module_platform_driver(max77802_pmic_driver);
+
+MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
+MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
+MODULE_LICENSE("GPL");