drivers/regulator/rt5120-regulator.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+

 #include <linux/bits.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/of_regulator.h>

 #define RT5120_REG_PGSTAT	0x03
 #define RT5120_REG_CH1VID	0x06
 #define RT5120_REG_CH1SLPVID	0x07
 #define RT5120_REG_ENABLE	0x08
 #define RT5120_REG_MODECTL	0x09
 #define RT5120_REG_UVOVPROT	0x0A
 #define RT5120_REG_SLPCTL	0x0C
 #define RT5120_REG_INTSTAT	0x1E
 #define RT5120_REG_DISCHG	0x1F

 #define RT5120_OUTPG_MASK(rid)	BIT(rid + 1)
 #define RT5120_OUTUV_MASK(rid)	BIT(rid + 9)
 #define RT5120_OUTOV_MASK(rid)	BIT(rid + 16)
 #define RT5120_CH1VID_MASK	GENMASK(6, 0)
 #define RT5120_RIDEN_MASK(rid)	BIT(rid + 1)
 #define RT5120_RADEN_MASK(rid)	BIT(rid)
 #define RT5120_FPWM_MASK(rid)	BIT(rid + 1)
 #define RT5120_UVHICCUP_MASK	BIT(1)
 #define RT5120_OVHICCUP_MASK	BIT(0)
 #define RT5120_HOTDIE_MASK	BIT(1)

 #define RT5120_BUCK1_MINUV	600000
 #define RT5120_BUCK1_MAXUV	1393750
 #define RT5120_BUCK1_STEPUV	6250
 #define RT5120_BUCK1_NUM_VOLT	0x80

 #define RT5120_AUTO_MODE	0
 #define RT5120_FPWM_MODE	1

 enum {
 	RT5120_REGULATOR_BUCK1 = 0,
 	RT5120_REGULATOR_BUCK2,
 	RT5120_REGULATOR_BUCK3,
 	RT5120_REGULATOR_BUCK4,
 	RT5120_REGULATOR_LDO,
 	RT5120_REGULATOR_EXTEN,
 	RT5120_MAX_REGULATOR
 };

 struct rt5120_priv {
 	struct device *dev;
 	struct regmap *regmap;
 	struct regulator_desc rdesc[RT5120_MAX_REGULATOR];
 };

 static int rt5120_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
 {
 	struct regmap *regmap = rdev_get_regmap(rdev);
 	int rid = rdev_get_id(rdev);
 	unsigned int mask = RT5120_FPWM_MASK(rid), val;

 	switch (mode) {
 	case REGULATOR_MODE_NORMAL:
 		val = 0;
 		break;
 	case REGULATOR_MODE_FAST:
 		val = RT5120_FPWM_MASK(rid);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return regmap_update_bits(regmap, RT5120_REG_MODECTL, mask, val);
 }

 static unsigned int rt5120_buck_get_mode(struct regulator_dev *rdev)
 {
 	struct regmap *regmap = rdev_get_regmap(rdev);
 	int ret, rid = rdev_get_id(rdev);
 	unsigned int val;

 	ret = regmap_read(regmap, RT5120_REG_MODECTL, &val);
 	if (ret)
 		return REGULATOR_MODE_INVALID;

 	if (val & RT5120_FPWM_MASK(rid))
 		return REGULATOR_MODE_FAST;

 	return REGULATOR_MODE_NORMAL;
 }

 static int rt5120_regulator_get_error_flags(struct regulator_dev *rdev,
 					    unsigned int *flags)
 {
 	struct regmap *regmap = rdev_get_regmap(rdev);
 	unsigned int stat, hd_stat, cur_flags = 0;
 	int rid = rdev_get_id(rdev), ret;

 	/*
 	 * reg 0x03/0x04/0x05 to indicate PG/UV/OV
 	 * use block read to descrease I/O xfer time
 	 */
 	ret = regmap_raw_read(regmap, RT5120_REG_PGSTAT, &stat, 3);
 	if (ret)
 		return ret;

 	ret = regmap_read(regmap, RT5120_REG_INTSTAT, &hd_stat);
 	if (ret)
 		return ret;

 	if (!(stat & RT5120_OUTPG_MASK(rid))) {
 		if (stat & RT5120_OUTUV_MASK(rid))
 			cur_flags |= REGULATOR_ERROR_UNDER_VOLTAGE;

 		if (stat & RT5120_OUTOV_MASK(rid))
 			cur_flags |= REGULATOR_ERROR_REGULATION_OUT;
 	}

 	if (hd_stat & RT5120_HOTDIE_MASK)
 		cur_flags |= REGULATOR_ERROR_OVER_TEMP;

 	*flags = cur_flags;
 	return 0;
 }

 static int rt5120_buck1_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 {
 	struct regmap *regmap = rdev_get_regmap(rdev);
 	int sel;

 	if (uV < RT5120_BUCK1_MINUV || uV > RT5120_BUCK1_MAXUV)
 		return -EINVAL;

 	sel = (uV - RT5120_BUCK1_MINUV) / RT5120_BUCK1_STEPUV;
 	return regmap_write(regmap, RT5120_REG_CH1SLPVID, sel);
 }

 static int rt5120_regulator_set_suspend_enable(struct regulator_dev *rdev)
 {
 	struct regmap *regmap = rdev_get_regmap(rdev);
 	int rid = rdev_get_id(rdev);
 	unsigned int mask = RT5120_RIDEN_MASK(rid);

 	return regmap_update_bits(regmap, RT5120_REG_SLPCTL, mask, mask);
 }

 static int rt5120_regulator_set_suspend_disable(struct regulator_dev *rdev)
 {
 	struct regmap *regmap = rdev_get_regmap(rdev);
 	int rid = rdev_get_id(rdev);
 	unsigned int mask = RT5120_RIDEN_MASK(rid);

 	return regmap_update_bits(regmap, RT5120_REG_SLPCTL, mask, 0);
 }

 static const struct regulator_ops rt5120_buck1_ops = {
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 	.is_enabled = regulator_is_enabled_regmap,
 	.list_voltage = regulator_list_voltage_linear,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.set_active_discharge = regulator_set_active_discharge_regmap,
 	.set_mode = rt5120_buck_set_mode,
 	.get_mode = rt5120_buck_get_mode,
 	.get_error_flags = rt5120_regulator_get_error_flags,
 	.set_suspend_voltage = rt5120_buck1_set_suspend_voltage,
 	.set_suspend_enable = rt5120_regulator_set_suspend_enable,
 	.set_suspend_disable = rt5120_regulator_set_suspend_disable,
 };

 static const struct regulator_ops rt5120_buck234_ops = {
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 	.is_enabled = regulator_is_enabled_regmap,
 	.set_active_discharge = regulator_set_active_discharge_regmap,
 	.set_mode = rt5120_buck_set_mode,
 	.get_mode = rt5120_buck_get_mode,
 	.get_error_flags = rt5120_regulator_get_error_flags,
 	.set_suspend_enable = rt5120_regulator_set_suspend_enable,
 	.set_suspend_disable = rt5120_regulator_set_suspend_disable,
 };

 static const struct regulator_ops rt5120_ldo_ops = {
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 	.is_enabled = regulator_is_enabled_regmap,
 	.set_active_discharge = regulator_set_active_discharge_regmap,
 	.get_error_flags = rt5120_regulator_get_error_flags,
 	.set_suspend_enable = rt5120_regulator_set_suspend_enable,
 	.set_suspend_disable = rt5120_regulator_set_suspend_disable,
 };

 static const struct regulator_ops rt5120_exten_ops = {
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 	.is_enabled = regulator_is_enabled_regmap,
 	.set_suspend_enable = rt5120_regulator_set_suspend_enable,
 	.set_suspend_disable = rt5120_regulator_set_suspend_disable,
 };

 static unsigned int rt5120_buck_of_map_mode(unsigned int mode)
 {
 	switch (mode) {
 	case RT5120_AUTO_MODE:
 		return REGULATOR_MODE_NORMAL;
 	case RT5120_FPWM_MODE:
 		return REGULATOR_MODE_FAST;
 	default:
 		return REGULATOR_MODE_INVALID;
 	}
 }

 static void rt5120_fillin_regulator_desc(struct regulator_desc *desc, int rid)
 {
 	static const char * const name[] = {
 		"buck1", "buck2", "buck3", "buck4", "ldo", "exten" };
 	static const char * const sname[] = {
 		"vin1", "vin2", "vin3", "vin4", "vinldo", NULL };

 	/* Common regulator property */
 	desc->name = name[rid];
 	desc->supply_name = sname[rid];
 	desc->owner = THIS_MODULE;
 	desc->type = REGULATOR_VOLTAGE;
 	desc->id = rid;
 	desc->enable_reg = RT5120_REG_ENABLE;
 	desc->enable_mask = RT5120_RIDEN_MASK(rid);
 	desc->active_discharge_reg = RT5120_REG_DISCHG;
 	desc->active_discharge_mask = RT5120_RADEN_MASK(rid);
 	desc->active_discharge_on = RT5120_RADEN_MASK(rid);
 	/* Config n_voltages to 1 for all*/
 	desc->n_voltages = 1;

 	/* Only buck support mode change */
 	if (rid >= RT5120_REGULATOR_BUCK1 && rid <= RT5120_REGULATOR_BUCK4)
 		desc->of_map_mode = rt5120_buck_of_map_mode;

 	/* RID specific property init */
 	switch (rid) {
 	case RT5120_REGULATOR_BUCK1:
 		/* Only buck1 support voltage change by I2C */
 		desc->n_voltages = RT5120_BUCK1_NUM_VOLT;
 		desc->min_uV = RT5120_BUCK1_MINUV;
 		desc->uV_step = RT5120_BUCK1_STEPUV;
 		desc->vsel_reg = RT5120_REG_CH1VID,
 		desc->vsel_mask = RT5120_CH1VID_MASK,
 		desc->ops = &rt5120_buck1_ops;
 		break;
 	case RT5120_REGULATOR_BUCK2 ... RT5120_REGULATOR_BUCK4:
 		desc->ops = &rt5120_buck234_ops;
 		break;
 	case RT5120_REGULATOR_LDO:
 		desc->ops = &rt5120_ldo_ops;
 		break;
 	default:
 		desc->ops = &rt5120_exten_ops;
 	}
 }

 static int rt5120_of_parse_cb(struct rt5120_priv *priv, int rid,
 			      struct of_regulator_match *match)
 {
 	struct regulator_desc *desc = priv->rdesc + rid;
 	struct regulator_init_data *init_data = match->init_data;

 	if (!init_data || rid == RT5120_REGULATOR_BUCK1)
 		return 0;

 	if (init_data->constraints.min_uV != init_data->constraints.max_uV) {
 		dev_err(priv->dev, "Variable voltage for fixed regulator\n");
 		return -EINVAL;
 	}

 	desc->fixed_uV = init_data->constraints.min_uV;
 	return 0;
 }

 static struct of_regulator_match rt5120_regu_match[RT5120_MAX_REGULATOR] = {
 	[RT5120_REGULATOR_BUCK1] = { .name = "buck1", },
 	[RT5120_REGULATOR_BUCK2] = { .name = "buck2", },
 	[RT5120_REGULATOR_BUCK3] = { .name = "buck3", },
 	[RT5120_REGULATOR_BUCK4] = { .name = "buck4", },
 	[RT5120_REGULATOR_LDO] = { .name = "ldo", },
 	[RT5120_REGULATOR_EXTEN] = { .name = "exten", }
 };

 static int rt5120_parse_regulator_dt_data(struct rt5120_priv *priv)
 {
 	struct device *dev = priv->dev->parent;
 	struct device_node *reg_node;
 	int i, ret;

 	for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
 		rt5120_fillin_regulator_desc(priv->rdesc + i, i);

 		rt5120_regu_match[i].desc = priv->rdesc + i;
 	}

 	reg_node = of_get_child_by_name(dev->of_node, "regulators");
 	if (!reg_node) {
 		dev_err(priv->dev, "Couldn't find 'regulators' node\n");
 		return -ENODEV;
 	}

 	ret = of_regulator_match(priv->dev, reg_node, rt5120_regu_match,
 				 ARRAY_SIZE(rt5120_regu_match));

 	of_node_put(reg_node);

 	if (ret < 0) {
 		dev_err(priv->dev,
 			"Error parsing regulator init data (%d)\n", ret);
 		return ret;
 	}

 	for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
 		ret = rt5120_of_parse_cb(priv, i, rt5120_regu_match + i);
 		if (ret) {
 			dev_err(priv->dev, "Failed in [%d] of_passe_cb\n", i);
 			return ret;
 		}
 	}

 	return 0;
 }

 static int rt5120_device_property_init(struct rt5120_priv *priv)
 {
 	struct device *dev = priv->dev->parent;
 	struct device_node *np = dev->of_node;
 	bool prot_enable;
 	unsigned int prot_enable_val = 0;

 	/* Assign UV/OV HW protection behavior */
 	prot_enable = of_property_read_bool(np,
 					    "richtek,enable-undervolt-hiccup");
 	if (prot_enable)
 		prot_enable_val |= RT5120_UVHICCUP_MASK;

 	prot_enable = of_property_read_bool(np,
 					    "richtek,enable-overvolt-hiccup");
 	if (prot_enable)
 		prot_enable_val |= RT5120_OVHICCUP_MASK;

 	return regmap_update_bits(priv->regmap, RT5120_REG_UVOVPROT,
 				  RT5120_UVHICCUP_MASK | RT5120_OVHICCUP_MASK,
 				  prot_enable_val);
 }

 static int rt5120_regulator_probe(struct platform_device *pdev)
 {
 	struct rt5120_priv *priv;
 	struct regulator_dev *rdev;
 	struct regulator_config config = {};
 	int i, ret;

 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	priv->dev = &pdev->dev;

 	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 	if (!priv->regmap) {
 		dev_err(&pdev->dev, "Failed to init regmap\n");
 		return -ENODEV;
 	}

 	ret = rt5120_device_property_init(priv);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to do property init\n");
 		return ret;
 	}

 	ret = rt5120_parse_regulator_dt_data(priv);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to parse dt data\n");
 		return ret;
 	}

 	config.dev = &pdev->dev;
 	config.regmap = priv->regmap;

 	for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
 		config.of_node = rt5120_regu_match[i].of_node;
 		config.init_data = rt5120_regu_match[i].init_data;

 		rdev = devm_regulator_register(&pdev->dev, priv->rdesc + i,
 					       &config);
 		if (IS_ERR(rdev)) {
 			dev_err(&pdev->dev,
 				"Failed to register regulator [%d]\n", i);
 			return PTR_ERR(rdev);
 		}
 	}

 	return 0;
 }

 static const struct platform_device_id rt5120_regulator_dev_table[] = {
 	{ "rt5120-regulator", 0 },
 	{}
 };
 MODULE_DEVICE_TABLE(platform, rt5120_regulator_dev_table);

 static struct platform_driver rt5120_regulator_driver = {
 	.driver = {
 		.name = "rt5120-regulator",
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 	.id_table = rt5120_regulator_dev_table,
 	.probe = rt5120_regulator_probe,
 };
 module_platform_driver(rt5120_regulator_driver);

 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
 MODULE_DESCRIPTION("Richtek RT5120 regulator driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0+

	#include <linux/bits.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/regulator/of_regulator.h>

	#define RT5120_REG_PGSTAT 0x03
	#define RT5120_REG_CH1VID 0x06
	#define RT5120_REG_CH1SLPVID 0x07
	#define RT5120_REG_ENABLE 0x08
	#define RT5120_REG_MODECTL 0x09
	#define RT5120_REG_UVOVPROT 0x0A
	#define RT5120_REG_SLPCTL 0x0C
	#define RT5120_REG_INTSTAT 0x1E
	#define RT5120_REG_DISCHG 0x1F

	#define RT5120_OUTPG_MASK(rid) BIT(rid + 1)
	#define RT5120_OUTUV_MASK(rid) BIT(rid + 9)
	#define RT5120_OUTOV_MASK(rid) BIT(rid + 16)
	#define RT5120_CH1VID_MASK GENMASK(6, 0)
	#define RT5120_RIDEN_MASK(rid) BIT(rid + 1)
	#define RT5120_RADEN_MASK(rid) BIT(rid)
	#define RT5120_FPWM_MASK(rid) BIT(rid + 1)
	#define RT5120_UVHICCUP_MASK BIT(1)
	#define RT5120_OVHICCUP_MASK BIT(0)
	#define RT5120_HOTDIE_MASK BIT(1)

	#define RT5120_BUCK1_MINUV 600000
	#define RT5120_BUCK1_MAXUV 1393750
	#define RT5120_BUCK1_STEPUV 6250
	#define RT5120_BUCK1_NUM_VOLT 0x80

	#define RT5120_AUTO_MODE 0
	#define RT5120_FPWM_MODE 1

	enum {
	RT5120_REGULATOR_BUCK1 = 0,
	RT5120_REGULATOR_BUCK2,
	RT5120_REGULATOR_BUCK3,
	RT5120_REGULATOR_BUCK4,
	RT5120_REGULATOR_LDO,
	RT5120_REGULATOR_EXTEN,
	RT5120_MAX_REGULATOR
	};

	struct rt5120_priv {
	struct device *dev;
	struct regmap *regmap;
	struct regulator_desc rdesc[RT5120_MAX_REGULATOR];
	};

	static int rt5120_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
	{
	struct regmap *regmap = rdev_get_regmap(rdev);
	int rid = rdev_get_id(rdev);
	unsigned int mask = RT5120_FPWM_MASK(rid), val;

	switch (mode) {
	case REGULATOR_MODE_NORMAL:
	val = 0;
	break;
	case REGULATOR_MODE_FAST:
	val = RT5120_FPWM_MASK(rid);
	break;
	default:
	return -EINVAL;
	}

	return regmap_update_bits(regmap, RT5120_REG_MODECTL, mask, val);
	}

	static unsigned int rt5120_buck_get_mode(struct regulator_dev *rdev)
	{
	struct regmap *regmap = rdev_get_regmap(rdev);
	int ret, rid = rdev_get_id(rdev);
	unsigned int val;

	ret = regmap_read(regmap, RT5120_REG_MODECTL, &val);
	if (ret)
	return REGULATOR_MODE_INVALID;

	if (val & RT5120_FPWM_MASK(rid))
	return REGULATOR_MODE_FAST;

	return REGULATOR_MODE_NORMAL;
	}

	static int rt5120_regulator_get_error_flags(struct regulator_dev *rdev,
	unsigned int *flags)
	{
	struct regmap *regmap = rdev_get_regmap(rdev);
	unsigned int stat, hd_stat, cur_flags = 0;
	int rid = rdev_get_id(rdev), ret;

	/*
	* reg 0x03/0x04/0x05 to indicate PG/UV/OV
	* use block read to descrease I/O xfer time
	*/
	ret = regmap_raw_read(regmap, RT5120_REG_PGSTAT, &stat, 3);
	if (ret)
	return ret;

	ret = regmap_read(regmap, RT5120_REG_INTSTAT, &hd_stat);
	if (ret)
	return ret;

	if (!(stat & RT5120_OUTPG_MASK(rid))) {
	if (stat & RT5120_OUTUV_MASK(rid))
	cur_flags \|= REGULATOR_ERROR_UNDER_VOLTAGE;

	if (stat & RT5120_OUTOV_MASK(rid))
	cur_flags \|= REGULATOR_ERROR_REGULATION_OUT;
	}

	if (hd_stat & RT5120_HOTDIE_MASK)
	cur_flags \|= REGULATOR_ERROR_OVER_TEMP;

	*flags = cur_flags;
	return 0;
	}

	static int rt5120_buck1_set_suspend_voltage(struct regulator_dev *rdev, int uV)
	{
	struct regmap *regmap = rdev_get_regmap(rdev);
	int sel;

	if (uV < RT5120_BUCK1_MINUV \|\| uV > RT5120_BUCK1_MAXUV)
	return -EINVAL;

	sel = (uV - RT5120_BUCK1_MINUV) / RT5120_BUCK1_STEPUV;
	return regmap_write(regmap, RT5120_REG_CH1SLPVID, sel);
	}

	static int rt5120_regulator_set_suspend_enable(struct regulator_dev *rdev)
	{
	struct regmap *regmap = rdev_get_regmap(rdev);
	int rid = rdev_get_id(rdev);
	unsigned int mask = RT5120_RIDEN_MASK(rid);

	return regmap_update_bits(regmap, RT5120_REG_SLPCTL, mask, mask);
	}

	static int rt5120_regulator_set_suspend_disable(struct regulator_dev *rdev)
	{
	struct regmap *regmap = rdev_get_regmap(rdev);
	int rid = rdev_get_id(rdev);
	unsigned int mask = RT5120_RIDEN_MASK(rid);

	return regmap_update_bits(regmap, RT5120_REG_SLPCTL, mask, 0);
	}

	static const struct regulator_ops rt5120_buck1_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_active_discharge = regulator_set_active_discharge_regmap,
	.set_mode = rt5120_buck_set_mode,
	.get_mode = rt5120_buck_get_mode,
	.get_error_flags = rt5120_regulator_get_error_flags,
	.set_suspend_voltage = rt5120_buck1_set_suspend_voltage,
	.set_suspend_enable = rt5120_regulator_set_suspend_enable,
	.set_suspend_disable = rt5120_regulator_set_suspend_disable,
	};

	static const struct regulator_ops rt5120_buck234_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_active_discharge = regulator_set_active_discharge_regmap,
	.set_mode = rt5120_buck_set_mode,
	.get_mode = rt5120_buck_get_mode,
	.get_error_flags = rt5120_regulator_get_error_flags,
	.set_suspend_enable = rt5120_regulator_set_suspend_enable,
	.set_suspend_disable = rt5120_regulator_set_suspend_disable,
	};

	static const struct regulator_ops rt5120_ldo_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_active_discharge = regulator_set_active_discharge_regmap,
	.get_error_flags = rt5120_regulator_get_error_flags,
	.set_suspend_enable = rt5120_regulator_set_suspend_enable,
	.set_suspend_disable = rt5120_regulator_set_suspend_disable,
	};

	static const struct regulator_ops rt5120_exten_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_suspend_enable = rt5120_regulator_set_suspend_enable,
	.set_suspend_disable = rt5120_regulator_set_suspend_disable,
	};

	static unsigned int rt5120_buck_of_map_mode(unsigned int mode)
	{
	switch (mode) {
	case RT5120_AUTO_MODE:
	return REGULATOR_MODE_NORMAL;
	case RT5120_FPWM_MODE:
	return REGULATOR_MODE_FAST;
	default:
	return REGULATOR_MODE_INVALID;
	}
	}

	static void rt5120_fillin_regulator_desc(struct regulator_desc *desc, int rid)
	{
	static const char * const name[] = {
	"buck1", "buck2", "buck3", "buck4", "ldo", "exten" };
	static const char * const sname[] = {
	"vin1", "vin2", "vin3", "vin4", "vinldo", NULL };

	/* Common regulator property */
	desc->name = name[rid];
	desc->supply_name = sname[rid];
	desc->owner = THIS_MODULE;
	desc->type = REGULATOR_VOLTAGE;
	desc->id = rid;
	desc->enable_reg = RT5120_REG_ENABLE;
	desc->enable_mask = RT5120_RIDEN_MASK(rid);
	desc->active_discharge_reg = RT5120_REG_DISCHG;
	desc->active_discharge_mask = RT5120_RADEN_MASK(rid);
	desc->active_discharge_on = RT5120_RADEN_MASK(rid);
	/* Config n_voltages to 1 for all*/
	desc->n_voltages = 1;

	/* Only buck support mode change */
	if (rid >= RT5120_REGULATOR_BUCK1 && rid <= RT5120_REGULATOR_BUCK4)
	desc->of_map_mode = rt5120_buck_of_map_mode;

	/* RID specific property init */
	switch (rid) {
	case RT5120_REGULATOR_BUCK1:
	/* Only buck1 support voltage change by I2C */
	desc->n_voltages = RT5120_BUCK1_NUM_VOLT;
	desc->min_uV = RT5120_BUCK1_MINUV;
	desc->uV_step = RT5120_BUCK1_STEPUV;
	desc->vsel_reg = RT5120_REG_CH1VID,
	desc->vsel_mask = RT5120_CH1VID_MASK,
	desc->ops = &rt5120_buck1_ops;
	break;
	case RT5120_REGULATOR_BUCK2 ... RT5120_REGULATOR_BUCK4:
	desc->ops = &rt5120_buck234_ops;
	break;
	case RT5120_REGULATOR_LDO:
	desc->ops = &rt5120_ldo_ops;
	break;
	default:
	desc->ops = &rt5120_exten_ops;
	}
	}

	static int rt5120_of_parse_cb(struct rt5120_priv *priv, int rid,
	struct of_regulator_match *match)
	{
	struct regulator_desc *desc = priv->rdesc + rid;
	struct regulator_init_data *init_data = match->init_data;

	if (!init_data \|\| rid == RT5120_REGULATOR_BUCK1)
	return 0;

	if (init_data->constraints.min_uV != init_data->constraints.max_uV) {
	dev_err(priv->dev, "Variable voltage for fixed regulator\n");
	return -EINVAL;
	}

	desc->fixed_uV = init_data->constraints.min_uV;
	return 0;
	}

	static struct of_regulator_match rt5120_regu_match[RT5120_MAX_REGULATOR] = {
	[RT5120_REGULATOR_BUCK1] = { .name = "buck1", },
	[RT5120_REGULATOR_BUCK2] = { .name = "buck2", },
	[RT5120_REGULATOR_BUCK3] = { .name = "buck3", },
	[RT5120_REGULATOR_BUCK4] = { .name = "buck4", },
	[RT5120_REGULATOR_LDO] = { .name = "ldo", },
	[RT5120_REGULATOR_EXTEN] = { .name = "exten", }
	};

	static int rt5120_parse_regulator_dt_data(struct rt5120_priv *priv)
	{
	struct device *dev = priv->dev->parent;
	struct device_node *reg_node;
	int i, ret;

	for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
	rt5120_fillin_regulator_desc(priv->rdesc + i, i);

	rt5120_regu_match[i].desc = priv->rdesc + i;
	}

	reg_node = of_get_child_by_name(dev->of_node, "regulators");
	if (!reg_node) {
	dev_err(priv->dev, "Couldn't find 'regulators' node\n");
	return -ENODEV;
	}

	ret = of_regulator_match(priv->dev, reg_node, rt5120_regu_match,
	ARRAY_SIZE(rt5120_regu_match));

	of_node_put(reg_node);

	if (ret < 0) {
	dev_err(priv->dev,
	"Error parsing regulator init data (%d)\n", ret);
	return ret;
	}

	for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
	ret = rt5120_of_parse_cb(priv, i, rt5120_regu_match + i);
	if (ret) {
	dev_err(priv->dev, "Failed in [%d] of_passe_cb\n", i);
	return ret;
	}
	}

	return 0;
	}

	static int rt5120_device_property_init(struct rt5120_priv *priv)
	{
	struct device *dev = priv->dev->parent;
	struct device_node *np = dev->of_node;
	bool prot_enable;
	unsigned int prot_enable_val = 0;

	/* Assign UV/OV HW protection behavior */
	prot_enable = of_property_read_bool(np,
	"richtek,enable-undervolt-hiccup");
	if (prot_enable)
	prot_enable_val \|= RT5120_UVHICCUP_MASK;

	prot_enable = of_property_read_bool(np,
	"richtek,enable-overvolt-hiccup");
	if (prot_enable)
	prot_enable_val \|= RT5120_OVHICCUP_MASK;

	return regmap_update_bits(priv->regmap, RT5120_REG_UVOVPROT,
	RT5120_UVHICCUP_MASK \| RT5120_OVHICCUP_MASK,
	prot_enable_val);
	}

	static int rt5120_regulator_probe(struct platform_device *pdev)
	{
	struct rt5120_priv *priv;
	struct regulator_dev *rdev;
	struct regulator_config config = {};
	int i, ret;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	priv->dev = &pdev->dev;

	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!priv->regmap) {
	dev_err(&pdev->dev, "Failed to init regmap\n");
	return -ENODEV;
	}

	ret = rt5120_device_property_init(priv);
	if (ret) {
	dev_err(&pdev->dev, "Failed to do property init\n");
	return ret;
	}

	ret = rt5120_parse_regulator_dt_data(priv);
	if (ret) {
	dev_err(&pdev->dev, "Failed to parse dt data\n");
	return ret;
	}

	config.dev = &pdev->dev;
	config.regmap = priv->regmap;

	for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
	config.of_node = rt5120_regu_match[i].of_node;
	config.init_data = rt5120_regu_match[i].init_data;

	rdev = devm_regulator_register(&pdev->dev, priv->rdesc + i,
	&config);
	if (IS_ERR(rdev)) {
	dev_err(&pdev->dev,
	"Failed to register regulator [%d]\n", i);
	return PTR_ERR(rdev);
	}
	}

	return 0;
	}

	static const struct platform_device_id rt5120_regulator_dev_table[] = {
	{ "rt5120-regulator", 0 },
	{}
	};
	MODULE_DEVICE_TABLE(platform, rt5120_regulator_dev_table);

	static struct platform_driver rt5120_regulator_driver = {
	.driver = {
	.name = "rt5120-regulator",
	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
	},
	.id_table = rt5120_regulator_dev_table,
	.probe = rt5120_regulator_probe,
	};
	module_platform_driver(rt5120_regulator_driver);

	MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
	MODULE_DESCRIPTION("Richtek RT5120 regulator driver");
	MODULE_LICENSE("GPL v2");