Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 566 insertions, 0 deletions

diff --git a/drivers/regulator/max77802-regulator.c b/drivers/regulator/max77802-regulator.c
new file mode 100644
index 000000000..befe5f319
--- /dev/null
+++ b/drivers/regulator/max77802-regulator.c
@@ -0,0 +1,566 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// 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@samsung.com>
+// Jonghwa Lee <jonghwa3.lee@samsung.com>
+//
+// This driver is based on max8997.c
+
+#include <linux/kernel.h>
+#include <linux/bug.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/module.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>
+#include <dt-bindings/regulator/maxim,max77802.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
+
+#define MAX77802_STATUS_OFF		0x0
+#define MAX77802_OFF_PWRREQ		0x1
+#define MAX77802_LP_PWRREQ		0x2
+
+static const unsigned int max77802_buck234_ramp_table[] = {
+	12500,
+	25000,
+	50000,
+	100000,
+};
+
+static const unsigned int max77802_buck16_ramp_table[] = {
+	1000,	2000,	3030,	4000,
+	5000,	5880,	7140,	8330,
+	9090,	10000,	11110,	12500,
+	16670,	25000,	50000,	100000,
+};
+
+struct max77802_regulator_prv {
+	/* Array indexed by regulator id */
+	unsigned int opmode[MAX77802_REG_MAX];
+};
+
+static inline unsigned int max77802_map_mode(unsigned int mode)
+{
+	return mode == MAX77802_OPMODE_NORMAL ?
+		REGULATOR_MODE_NORMAL : REGULATOR_MODE_STANDBY;
+}
+
+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;
+}
+
+/**
+ * max77802_set_suspend_disable - Disable the regulator during system suspend
+ * @rdev: regulator to mark as disabled
+ *
+ * All regulators expect LDO 1, 3, 20 and 21 support OFF by PWRREQ.
+ * Configure the regulator so the PMIC will turn it OFF during system suspend.
+ */
+static int max77802_set_suspend_disable(struct regulator_dev *rdev)
+{
+	unsigned int val = MAX77802_OFF_PWRREQ;
+	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
+	unsigned int id = rdev_get_id(rdev);
+	int shift = max77802_get_opmode_shift(id);
+
+	if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
+		return -EINVAL;
+	max77802->opmode[id] = val;
+	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+				  rdev->desc->enable_mask, val << shift);
+}
+
+/*
+ * Some LDOs support Low Power Mode while the system is running.
+ *
+ * LDOs 1, 3, 20, 21.
+ */
+static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
+	unsigned int id = rdev_get_id(rdev);
+	unsigned int val;
+	int shift = max77802_get_opmode_shift(id);
+
+	switch (mode) {
+	case REGULATOR_MODE_STANDBY:
+		val = MAX77802_OPMODE_LP;	/* ON in Low Power Mode */
+		break;
+	case REGULATOR_MODE_NORMAL:
+		val = MAX77802_OPMODE_NORMAL;	/* ON in Normal Mode */
+		break;
+	default:
+		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
+			 rdev->desc->name, mode);
+		return -EINVAL;
+	}
+
+	if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
+		return -EINVAL;
+
+	max77802->opmode[id] = val;
+	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+				  rdev->desc->enable_mask, val << shift);
+}
+
+static unsigned max77802_get_mode(struct regulator_dev *rdev)
+{
+	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
+	unsigned int id = rdev_get_id(rdev);
+
+	if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
+		return -EINVAL;
+	return max77802_map_mode(max77802->opmode[id]);
+}
+
+/**
+ * max77802_set_suspend_mode - set regulator opmode when the system is suspended
+ * @rdev: regulator to change mode
+ * @mode: operating mode to be set
+ *
+ * Will set the operating mode for the regulators during system suspend.
+ * This function is valid for the three different enable control logics:
+ *
+ * Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
+ * Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
+ * Enable Control Logic3 by PWRREQ (LDO 3)
+ *
+ * If setting the regulator mode fails, the function only warns but does
+ * not return an error code to avoid the regulator core to stop setting
+ * the operating mode for the remaining regulators.
+ */
+static int max77802_set_suspend_mode(struct regulator_dev *rdev,
+				     unsigned int mode)
+{
+	struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
+	unsigned int id = rdev_get_id(rdev);
+	unsigned int val;
+	int shift = max77802_get_opmode_shift(id);
+
+	if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
+		return -EINVAL;
+
+	/*
+	 * If the regulator has been disabled for suspend
+	 * then is invalid to try setting a suspend mode.
+	 */
+	if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
+		dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
+			 rdev->desc->name, mode);
+		return 0;
+	}
+
+	switch (mode) {
+	case REGULATOR_MODE_STANDBY:
+		/*
+		 * If the regulator opmode is normal then enable
+		 * ON in Low Power Mode by PWRREQ. If the mode is
+		 * already Low Power then no action is required.
+		 */
+		if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
+			val = MAX77802_LP_PWRREQ;
+		else
+			return 0;
+		break;
+	case REGULATOR_MODE_NORMAL:
+		/*
+		 * If the regulator operating mode is Low Power then
+		 * normal is not a valid opmode in suspend. If the
+		 * mode is already normal then no action is required.
+		 */
+		if (max77802->opmode[id] == MAX77802_OPMODE_LP)
+			dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
+				 rdev->desc->name, mode);
+		return 0;
+	default:
+		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
+			 rdev->desc->name, mode);
+		return -EINVAL;
+	}
+
+	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);
+	unsigned int id = rdev_get_id(rdev);
+	int shift = max77802_get_opmode_shift(id);
+
+	if (WARN_ON_ONCE(id >= ARRAY_SIZE(max77802->opmode)))
+		return -EINVAL;
+	if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
+		max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
+
+	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+				  rdev->desc->enable_mask,
+				  max77802->opmode[id] << shift);
+}
+
+/*
+ * LDOs 2, 4-19, 22-35
+ */
+static const 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_disable	= max77802_set_suspend_disable,
+	.set_suspend_mode	= max77802_set_suspend_mode,
+};
+
+/*
+ * LDOs 1, 20, 21, 3
+ */
+static const 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_mode		= max77802_set_mode,
+	.get_mode		= max77802_get_mode,
+	.set_suspend_mode	= max77802_set_suspend_mode,
+};
+
+/* BUCKS 1, 6 */
+static const 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		= regulator_set_ramp_delay_regmap,
+	.set_suspend_disable	= max77802_set_suspend_disable,
+};
+
+/* BUCKs 2-4 */
+static const struct regulator_ops max77802_buck_234_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		= regulator_set_ramp_delay_regmap,
+	.set_suspend_disable	= max77802_set_suspend_disable,
+	.set_suspend_mode	= max77802_set_suspend_mode,
+};
+
+/* BUCKs 5, 7-10 */
+static const 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_suspend_disable	= max77802_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,					\
+	.of_match	= of_match_ptr("LDO"#num),			\
+	.regulators_node	= of_match_ptr("regulators"),		\
+	.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, \
+	.of_map_mode	= max77802_map_mode,				\
+}
+
+/* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
+#define regulator_77802_desc_n_ldo(num, supply, log)   {		\
+	.name		= "LDO"#num,					\
+	.of_match	= of_match_ptr("LDO"#num),			\
+	.regulators_node	= of_match_ptr("regulators"),		\
+	.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, \
+	.of_map_mode	= max77802_map_mode,				\
+}
+
+/* BUCKs 1, 6 */
+#define regulator_77802_desc_16_buck(num)	{		\
+	.name		= "BUCK"#num,					\
+	.of_match	= of_match_ptr("BUCK"#num),			\
+	.regulators_node	= of_match_ptr("regulators"),		\
+	.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,				\
+	.ramp_reg	= MAX77802_REG_BUCK ## num ## CTRL,		\
+	.ramp_mask	= MAX77802_RAMP_RATE_MASK_4BIT,			\
+	.ramp_delay_table = max77802_buck16_ramp_table,			\
+	.n_ramp_values	= ARRAY_SIZE(max77802_buck16_ramp_table),	\
+	.of_map_mode	= max77802_map_mode,				\
+}
+
+/* BUCKS 2-4 */
+#define regulator_77802_desc_234_buck(num)	{		\
+	.name		= "BUCK"#num,					\
+	.of_match	= of_match_ptr("BUCK"#num),			\
+	.regulators_node	= of_match_ptr("regulators"),		\
+	.id		= MAX77802_BUCK##num,				\
+	.supply_name	= "inb"#num,					\
+	.ops		= &max77802_buck_234_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,		\
+	.ramp_reg	= MAX77802_REG_BUCK ## num ## CTRL1,		\
+	.ramp_mask	= MAX77802_RAMP_RATE_MASK_2BIT,			\
+	.ramp_delay_table = max77802_buck234_ramp_table,		\
+	.n_ramp_values	= ARRAY_SIZE(max77802_buck234_ramp_table),	\
+	.of_map_mode	= max77802_map_mode,				\
+}
+
+/* BUCK 5 */
+#define regulator_77802_desc_buck5(num)		{		\
+	.name		= "BUCK"#num,					\
+	.of_match	= of_match_ptr("BUCK"#num),			\
+	.regulators_node	= of_match_ptr("regulators"),		\
+	.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,				\
+	.of_map_mode	= max77802_map_mode,				\
+}
+
+/* BUCKs 7-10 */
+#define regulator_77802_desc_buck7_10(num)	{		\
+	.name		= "BUCK"#num,					\
+	.of_match	= of_match_ptr("BUCK"#num),			\
+	.regulators_node	= of_match_ptr("regulators"),		\
+	.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,				\
+	.of_map_mode	= max77802_map_mode,				\
+}
+
+static const 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),
+};
+
+static int max77802_pmic_probe(struct platform_device *pdev)
+{
+	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+	struct max77802_regulator_prv *max77802;
+	int i, val;
+	struct regulator_config config = { };
+
+	max77802 = devm_kzalloc(&pdev->dev,
+				sizeof(struct max77802_regulator_prv),
+				GFP_KERNEL);
+	if (!max77802)
+		return -ENOMEM;
+
+	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;
+		unsigned int id = regulators[i].id;
+		int shift = max77802_get_opmode_shift(id);
+		int ret;
+
+		ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
+		if (ret < 0) {
+			dev_warn(&pdev->dev,
+				"cannot read current mode for %d\n", i);
+			val = MAX77802_OPMODE_NORMAL;
+		} else {
+			val = val >> shift & MAX77802_OPMODE_MASK;
+		}
+
+		/*
+		 * If the regulator is disabled and the system warm rebooted,
+		 * the hardware reports OFF as the regulator operating mode.
+		 * Default to operating mode NORMAL in that case.
+		 */
+		if (id < ARRAY_SIZE(max77802->opmode)) {
+			if (val == MAX77802_STATUS_OFF)
+				max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
+			else
+				max77802->opmode[id] = val;
+		}
+
+		rdev = devm_regulator_register(&pdev->dev,
+					       &regulators[i], &config);
+		if (IS_ERR(rdev)) {
+			ret = PTR_ERR(rdev);
+			dev_err(&pdev->dev,
+				"regulator init failed for %d: %d\n", i, ret);
+			return ret;
+		}
+	}
+
+	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",
+	},
+	.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");