drivers/regulator/rt5759-regulator.c - linux - Git at Google

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

 #include <linux/bits.h>
 #include <linux/i2c.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/of_regulator.h>

 #define RT5759_REG_VENDORINFO	0x00
 #define RT5759_REG_FREQ		0x01
 #define RT5759_REG_VSEL		0x02
 #define RT5759_REG_DCDCCTRL	0x03
 #define RT5759_REG_STATUS	0x04
 #define RT5759_REG_DCDCSET	0x05
 #define RT5759A_REG_WDTEN	0x42

 #define RT5759_TSTEP_MASK	GENMASK(3, 2)
 #define RT5759_VSEL_MASK	GENMASK(6, 0)
 #define RT5759_DISCHARGE_MASK	BIT(3)
 #define RT5759_FPWM_MASK	BIT(2)
 #define RT5759_ENABLE_MASK	BIT(1)
 #define RT5759_OT_MASK		BIT(1)
 #define RT5759_UV_MASK		BIT(0)
 #define RT5957_OCLVL_MASK	GENMASK(7, 6)
 #define RT5759_OCLVL_SHIFT	6
 #define RT5957_OTLVL_MASK	GENMASK(5, 4)
 #define RT5759_OTLVL_SHIFT	4
 #define RT5759A_WDTEN_MASK	BIT(1)

 #define RT5759_MANUFACTURER_ID	0x82
 /* vsel range 0x00 ~ 0x5A */
 #define RT5759_NUM_VOLTS	91
 #define RT5759_MIN_UV		600000
 #define RT5759_STEP_UV		10000
 #define RT5759A_STEP_UV		12500
 #define RT5759_MINSS_TIMEUS	1500

 #define RT5759_PSKIP_MODE	0
 #define RT5759_FPWM_MODE	1

 enum {
 	CHIP_TYPE_RT5759 = 0,
 	CHIP_TYPE_RT5759A,
 	CHIP_TYPE_MAX
 };

 struct rt5759_priv {
 	struct device *dev;
 	struct regmap *regmap;
 	struct regulator_desc desc;
 	unsigned long chip_type;
 };

 static int rt5759_set_mode(struct regulator_dev *rdev, unsigned int mode)
 {
 	struct regmap *regmap = rdev_get_regmap(rdev);
 	unsigned int mode_val;

 	switch (mode) {
 	case REGULATOR_MODE_NORMAL:
 		mode_val = 0;
 		break;
 	case REGULATOR_MODE_FAST:
 		mode_val = RT5759_FPWM_MASK;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return regmap_update_bits(regmap, RT5759_REG_STATUS, RT5759_FPWM_MASK,
 				  mode_val);
 }

 static unsigned int rt5759_get_mode(struct regulator_dev *rdev)
 {
 	struct regmap *regmap = rdev_get_regmap(rdev);
 	unsigned int regval;
 	int ret;

 	ret = regmap_read(regmap, RT5759_REG_DCDCCTRL, &regval);
 	if (ret)
 		return REGULATOR_MODE_INVALID;

 	if (regval & RT5759_FPWM_MASK)
 		return REGULATOR_MODE_FAST;

 	return REGULATOR_MODE_NORMAL;
 }

 static int rt5759_get_error_flags(struct regulator_dev *rdev,
 				  unsigned int *flags)
 {
 	struct regmap *regmap = rdev_get_regmap(rdev);
 	unsigned int status, events = 0;
 	int ret;

 	ret = regmap_read(regmap, RT5759_REG_STATUS, &status);
 	if (ret)
 		return ret;

 	if (status & RT5759_OT_MASK)
 		events |= REGULATOR_ERROR_OVER_TEMP;

 	if (status & RT5759_UV_MASK)
 		events |= REGULATOR_ERROR_UNDER_VOLTAGE;

 	*flags = events;
 	return 0;
 }

 static int rt5759_set_ocp(struct regulator_dev *rdev, int lim_uA, int severity,
 			  bool enable)
 {
 	struct regmap *regmap = rdev_get_regmap(rdev);
 	int ocp_lvl[] = { 9800000, 10800000, 11800000 };
 	unsigned int ocp_regval;
 	int i;

 	/* Only support over current protection parameter */
 	if (severity != REGULATOR_SEVERITY_PROT)
 		return 0;

 	if (enable) {
 		/* Default ocp level is 10.8A */
 		if (lim_uA == 0)
 			lim_uA = 10800000;

 		for (i = 0; i < ARRAY_SIZE(ocp_lvl); i++) {
 			if (lim_uA <= ocp_lvl[i])
 				break;
 		}

 		if (i == ARRAY_SIZE(ocp_lvl))
 			i = ARRAY_SIZE(ocp_lvl) - 1;

 		ocp_regval = i + 1;
 	} else
 		ocp_regval = 0;

 	return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OCLVL_MASK,
 				  ocp_regval << RT5759_OCLVL_SHIFT);
 }

 static int rt5759_set_otp(struct regulator_dev *rdev, int lim, int severity,
 			  bool enable)
 {
 	struct regmap *regmap = rdev_get_regmap(rdev);
 	int otp_lvl[] = { 140, 150, 170 };
 	unsigned int otp_regval;
 	int i;

 	/* Only support over temperature protection parameter */
 	if (severity != REGULATOR_SEVERITY_PROT)
 		return 0;

 	if (enable) {
 		/* Default otp level is 150'c */
 		if (lim == 0)
 			lim = 150;

 		for (i = 0; i < ARRAY_SIZE(otp_lvl); i++) {
 			if (lim <= otp_lvl[i])
 				break;
 		}

 		if (i == ARRAY_SIZE(otp_lvl))
 			i = ARRAY_SIZE(otp_lvl) - 1;

 		otp_regval = i + 1;
 	} else
 		otp_regval = 0;

 	return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OTLVL_MASK,
 				  otp_regval << RT5759_OTLVL_SHIFT);
 }

 static const struct regulator_ops rt5759_regulator_ops = {
 	.list_voltage = regulator_list_voltage_linear,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 	.is_enabled = regulator_is_enabled_regmap,
 	.set_active_discharge = regulator_set_active_discharge_regmap,
 	.set_mode = rt5759_set_mode,
 	.get_mode = rt5759_get_mode,
 	.set_ramp_delay = regulator_set_ramp_delay_regmap,
 	.get_error_flags = rt5759_get_error_flags,
 	.set_over_current_protection = rt5759_set_ocp,
 	.set_thermal_protection = rt5759_set_otp,
 };

 static unsigned int rt5759_of_map_mode(unsigned int mode)
 {
 	switch (mode) {
 	case RT5759_FPWM_MODE:
 		return REGULATOR_MODE_FAST;
 	case RT5759_PSKIP_MODE:
 		return REGULATOR_MODE_NORMAL;
 	default:
 		return REGULATOR_MODE_INVALID;
 	}
 }

 static const unsigned int rt5759_ramp_table[] = { 20000, 15000, 10000, 5000 };

 static int rt5759_regulator_register(struct rt5759_priv *priv)
 {
 	struct device_node *np = priv->dev->of_node;
 	struct regulator_desc *reg_desc = &priv->desc;
 	struct regulator_config reg_cfg;
 	struct regulator_dev *rdev;
 	int ret;

 	reg_desc->name = "rt5759-buck";
 	reg_desc->type = REGULATOR_VOLTAGE;
 	reg_desc->owner = THIS_MODULE;
 	reg_desc->ops = &rt5759_regulator_ops;
 	reg_desc->n_voltages = RT5759_NUM_VOLTS;
 	reg_desc->min_uV = RT5759_MIN_UV;
 	reg_desc->uV_step = RT5759_STEP_UV;
 	reg_desc->vsel_reg = RT5759_REG_VSEL;
 	reg_desc->vsel_mask = RT5759_VSEL_MASK;
 	reg_desc->enable_reg = RT5759_REG_DCDCCTRL;
 	reg_desc->enable_mask = RT5759_ENABLE_MASK;
 	reg_desc->active_discharge_reg = RT5759_REG_DCDCCTRL;
 	reg_desc->active_discharge_mask = RT5759_DISCHARGE_MASK;
 	reg_desc->active_discharge_on = RT5759_DISCHARGE_MASK;
 	reg_desc->ramp_reg = RT5759_REG_FREQ;
 	reg_desc->ramp_mask = RT5759_TSTEP_MASK;
 	reg_desc->ramp_delay_table = rt5759_ramp_table;
 	reg_desc->n_ramp_values = ARRAY_SIZE(rt5759_ramp_table);
 	reg_desc->enable_time = RT5759_MINSS_TIMEUS;
 	reg_desc->of_map_mode = rt5759_of_map_mode;

 	/*
 	 * RT5759 step uV = 10000
 	 * RT5759A step uV = 12500
 	 */
 	if (priv->chip_type == CHIP_TYPE_RT5759A)
 		reg_desc->uV_step = RT5759A_STEP_UV;

 	memset(&reg_cfg, 0, sizeof(reg_cfg));
 	reg_cfg.dev = priv->dev;
 	reg_cfg.of_node = np;
 	reg_cfg.init_data = of_get_regulator_init_data(priv->dev, np, reg_desc);
 	reg_cfg.regmap = priv->regmap;

 	rdev = devm_regulator_register(priv->dev, reg_desc, &reg_cfg);
 	if (IS_ERR(rdev)) {
 		ret = PTR_ERR(rdev);
 		dev_err(priv->dev, "Failed to register regulator (%d)\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int rt5759_init_device_property(struct rt5759_priv *priv)
 {
 	unsigned int val = 0;

 	/*
 	 * Only RT5759A support external watchdog input
 	 */
 	if (priv->chip_type != CHIP_TYPE_RT5759A)
 		return 0;

 	if (device_property_read_bool(priv->dev, "richtek,watchdog-enable"))
 		val = RT5759A_WDTEN_MASK;

 	return regmap_update_bits(priv->regmap, RT5759A_REG_WDTEN,
 				  RT5759A_WDTEN_MASK, val);
 }

 static int rt5759_manufacturer_check(struct rt5759_priv *priv)
 {
 	unsigned int vendor;
 	int ret;

 	ret = regmap_read(priv->regmap, RT5759_REG_VENDORINFO, &vendor);
 	if (ret)
 		return ret;

 	if (vendor != RT5759_MANUFACTURER_ID) {
 		dev_err(priv->dev, "vendor info not correct (%d)\n", vendor);
 		return -EINVAL;
 	}

 	return 0;
 }

 static bool rt5759_is_accessible_reg(struct device *dev, unsigned int reg)
 {
 	struct rt5759_priv *priv = dev_get_drvdata(dev);

 	if (reg <= RT5759_REG_DCDCSET)
 		return true;

 	if (priv->chip_type == CHIP_TYPE_RT5759A && reg == RT5759A_REG_WDTEN)
 		return true;

 	return false;
 }

 static const struct regmap_config rt5759_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = RT5759A_REG_WDTEN,
 	.readable_reg = rt5759_is_accessible_reg,
 	.writeable_reg = rt5759_is_accessible_reg,
 };

 static int rt5759_probe(struct i2c_client *i2c)
 {
 	struct rt5759_priv *priv;
 	int ret;

 	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	priv->dev = &i2c->dev;
 	priv->chip_type = (unsigned long)of_device_get_match_data(&i2c->dev);
 	i2c_set_clientdata(i2c, priv);

 	priv->regmap = devm_regmap_init_i2c(i2c, &rt5759_regmap_config);
 	if (IS_ERR(priv->regmap)) {
 		ret = PTR_ERR(priv->regmap);
 		dev_err(&i2c->dev, "Failed to allocate regmap (%d)\n", ret);
 		return ret;
 	}

 	ret = rt5759_manufacturer_check(priv);
 	if (ret) {
 		dev_err(&i2c->dev, "Failed to check device (%d)\n", ret);
 		return ret;
 	}

 	ret = rt5759_init_device_property(priv);
 	if (ret) {
 		dev_err(&i2c->dev, "Failed to init device (%d)\n", ret);
 		return ret;
 	}

 	return rt5759_regulator_register(priv);
 }

 static const struct of_device_id __maybe_unused rt5759_device_table[] = {
 	{ .compatible = "richtek,rt5759", .data = (void *)CHIP_TYPE_RT5759 },
 	{ .compatible = "richtek,rt5759a", .data = (void *)CHIP_TYPE_RT5759A },
 	{}
 };
 MODULE_DEVICE_TABLE(of, rt5759_device_table);

 static struct i2c_driver rt5759_driver = {
 	.driver = {
 		.name = "rt5759",
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 		.of_match_table = of_match_ptr(rt5759_device_table),
 	},
 	.probe = rt5759_probe,
 };
 module_i2c_driver(rt5759_driver);

 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
 MODULE_DESCRIPTION("Richtek RT5759 Regulator Driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0+

	#include <linux/bits.h>
	#include <linux/i2c.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/regmap.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/of_regulator.h>

	#define RT5759_REG_VENDORINFO 0x00
	#define RT5759_REG_FREQ 0x01
	#define RT5759_REG_VSEL 0x02
	#define RT5759_REG_DCDCCTRL 0x03
	#define RT5759_REG_STATUS 0x04
	#define RT5759_REG_DCDCSET 0x05
	#define RT5759A_REG_WDTEN 0x42

	#define RT5759_TSTEP_MASK GENMASK(3, 2)
	#define RT5759_VSEL_MASK GENMASK(6, 0)
	#define RT5759_DISCHARGE_MASK BIT(3)
	#define RT5759_FPWM_MASK BIT(2)
	#define RT5759_ENABLE_MASK BIT(1)
	#define RT5759_OT_MASK BIT(1)
	#define RT5759_UV_MASK BIT(0)
	#define RT5957_OCLVL_MASK GENMASK(7, 6)
	#define RT5759_OCLVL_SHIFT 6
	#define RT5957_OTLVL_MASK GENMASK(5, 4)
	#define RT5759_OTLVL_SHIFT 4
	#define RT5759A_WDTEN_MASK BIT(1)

	#define RT5759_MANUFACTURER_ID 0x82
	/* vsel range 0x00 ~ 0x5A */
	#define RT5759_NUM_VOLTS 91
	#define RT5759_MIN_UV 600000
	#define RT5759_STEP_UV 10000
	#define RT5759A_STEP_UV 12500
	#define RT5759_MINSS_TIMEUS 1500

	#define RT5759_PSKIP_MODE 0
	#define RT5759_FPWM_MODE 1

	enum {
	CHIP_TYPE_RT5759 = 0,
	CHIP_TYPE_RT5759A,
	CHIP_TYPE_MAX
	};

	struct rt5759_priv {
	struct device *dev;
	struct regmap *regmap;
	struct regulator_desc desc;
	unsigned long chip_type;
	};

	static int rt5759_set_mode(struct regulator_dev *rdev, unsigned int mode)
	{
	struct regmap *regmap = rdev_get_regmap(rdev);
	unsigned int mode_val;

	switch (mode) {
	case REGULATOR_MODE_NORMAL:
	mode_val = 0;
	break;
	case REGULATOR_MODE_FAST:
	mode_val = RT5759_FPWM_MASK;
	break;
	default:
	return -EINVAL;
	}

	return regmap_update_bits(regmap, RT5759_REG_STATUS, RT5759_FPWM_MASK,
	mode_val);
	}

	static unsigned int rt5759_get_mode(struct regulator_dev *rdev)
	{
	struct regmap *regmap = rdev_get_regmap(rdev);
	unsigned int regval;
	int ret;

	ret = regmap_read(regmap, RT5759_REG_DCDCCTRL, &regval);
	if (ret)
	return REGULATOR_MODE_INVALID;

	if (regval & RT5759_FPWM_MASK)
	return REGULATOR_MODE_FAST;

	return REGULATOR_MODE_NORMAL;
	}

	static int rt5759_get_error_flags(struct regulator_dev *rdev,
	unsigned int *flags)
	{
	struct regmap *regmap = rdev_get_regmap(rdev);
	unsigned int status, events = 0;
	int ret;

	ret = regmap_read(regmap, RT5759_REG_STATUS, &status);
	if (ret)
	return ret;

	if (status & RT5759_OT_MASK)
	events \|= REGULATOR_ERROR_OVER_TEMP;

	if (status & RT5759_UV_MASK)
	events \|= REGULATOR_ERROR_UNDER_VOLTAGE;

	*flags = events;
	return 0;
	}

	static int rt5759_set_ocp(struct regulator_dev *rdev, int lim_uA, int severity,
	bool enable)
	{
	struct regmap *regmap = rdev_get_regmap(rdev);
	int ocp_lvl[] = { 9800000, 10800000, 11800000 };
	unsigned int ocp_regval;
	int i;

	/* Only support over current protection parameter */
	if (severity != REGULATOR_SEVERITY_PROT)
	return 0;

	if (enable) {
	/* Default ocp level is 10.8A */
	if (lim_uA == 0)
	lim_uA = 10800000;

	for (i = 0; i < ARRAY_SIZE(ocp_lvl); i++) {
	if (lim_uA <= ocp_lvl[i])
	break;
	}

	if (i == ARRAY_SIZE(ocp_lvl))
	i = ARRAY_SIZE(ocp_lvl) - 1;

	ocp_regval = i + 1;
	} else
	ocp_regval = 0;

	return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OCLVL_MASK,
	ocp_regval << RT5759_OCLVL_SHIFT);
	}

	static int rt5759_set_otp(struct regulator_dev *rdev, int lim, int severity,
	bool enable)
	{
	struct regmap *regmap = rdev_get_regmap(rdev);
	int otp_lvl[] = { 140, 150, 170 };
	unsigned int otp_regval;
	int i;

	/* Only support over temperature protection parameter */
	if (severity != REGULATOR_SEVERITY_PROT)
	return 0;

	if (enable) {
	/* Default otp level is 150'c */
	if (lim == 0)
	lim = 150;

	for (i = 0; i < ARRAY_SIZE(otp_lvl); i++) {
	if (lim <= otp_lvl[i])
	break;
	}

	if (i == ARRAY_SIZE(otp_lvl))
	i = ARRAY_SIZE(otp_lvl) - 1;

	otp_regval = i + 1;
	} else
	otp_regval = 0;

	return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OTLVL_MASK,
	otp_regval << RT5759_OTLVL_SHIFT);
	}

	static const struct regulator_ops rt5759_regulator_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_active_discharge = regulator_set_active_discharge_regmap,
	.set_mode = rt5759_set_mode,
	.get_mode = rt5759_get_mode,
	.set_ramp_delay = regulator_set_ramp_delay_regmap,
	.get_error_flags = rt5759_get_error_flags,
	.set_over_current_protection = rt5759_set_ocp,
	.set_thermal_protection = rt5759_set_otp,
	};

	static unsigned int rt5759_of_map_mode(unsigned int mode)
	{
	switch (mode) {
	case RT5759_FPWM_MODE:
	return REGULATOR_MODE_FAST;
	case RT5759_PSKIP_MODE:
	return REGULATOR_MODE_NORMAL;
	default:
	return REGULATOR_MODE_INVALID;
	}
	}

	static const unsigned int rt5759_ramp_table[] = { 20000, 15000, 10000, 5000 };

	static int rt5759_regulator_register(struct rt5759_priv *priv)
	{
	struct device_node *np = priv->dev->of_node;
	struct regulator_desc *reg_desc = &priv->desc;
	struct regulator_config reg_cfg;
	struct regulator_dev *rdev;
	int ret;

	reg_desc->name = "rt5759-buck";
	reg_desc->type = REGULATOR_VOLTAGE;
	reg_desc->owner = THIS_MODULE;
	reg_desc->ops = &rt5759_regulator_ops;
	reg_desc->n_voltages = RT5759_NUM_VOLTS;
	reg_desc->min_uV = RT5759_MIN_UV;
	reg_desc->uV_step = RT5759_STEP_UV;
	reg_desc->vsel_reg = RT5759_REG_VSEL;
	reg_desc->vsel_mask = RT5759_VSEL_MASK;
	reg_desc->enable_reg = RT5759_REG_DCDCCTRL;
	reg_desc->enable_mask = RT5759_ENABLE_MASK;
	reg_desc->active_discharge_reg = RT5759_REG_DCDCCTRL;
	reg_desc->active_discharge_mask = RT5759_DISCHARGE_MASK;
	reg_desc->active_discharge_on = RT5759_DISCHARGE_MASK;
	reg_desc->ramp_reg = RT5759_REG_FREQ;
	reg_desc->ramp_mask = RT5759_TSTEP_MASK;
	reg_desc->ramp_delay_table = rt5759_ramp_table;
	reg_desc->n_ramp_values = ARRAY_SIZE(rt5759_ramp_table);
	reg_desc->enable_time = RT5759_MINSS_TIMEUS;
	reg_desc->of_map_mode = rt5759_of_map_mode;

	/*
	* RT5759 step uV = 10000
	* RT5759A step uV = 12500
	*/
	if (priv->chip_type == CHIP_TYPE_RT5759A)
	reg_desc->uV_step = RT5759A_STEP_UV;

	memset(&reg_cfg, 0, sizeof(reg_cfg));
	reg_cfg.dev = priv->dev;
	reg_cfg.of_node = np;
	reg_cfg.init_data = of_get_regulator_init_data(priv->dev, np, reg_desc);
	reg_cfg.regmap = priv->regmap;

	rdev = devm_regulator_register(priv->dev, reg_desc, &reg_cfg);
	if (IS_ERR(rdev)) {
	ret = PTR_ERR(rdev);
	dev_err(priv->dev, "Failed to register regulator (%d)\n", ret);
	return ret;
	}

	return 0;
	}

	static int rt5759_init_device_property(struct rt5759_priv *priv)
	{
	unsigned int val = 0;

	/*
	* Only RT5759A support external watchdog input
	*/
	if (priv->chip_type != CHIP_TYPE_RT5759A)
	return 0;

	if (device_property_read_bool(priv->dev, "richtek,watchdog-enable"))
	val = RT5759A_WDTEN_MASK;

	return regmap_update_bits(priv->regmap, RT5759A_REG_WDTEN,
	RT5759A_WDTEN_MASK, val);
	}

	static int rt5759_manufacturer_check(struct rt5759_priv *priv)
	{
	unsigned int vendor;
	int ret;

	ret = regmap_read(priv->regmap, RT5759_REG_VENDORINFO, &vendor);
	if (ret)
	return ret;

	if (vendor != RT5759_MANUFACTURER_ID) {
	dev_err(priv->dev, "vendor info not correct (%d)\n", vendor);
	return -EINVAL;
	}

	return 0;
	}

	static bool rt5759_is_accessible_reg(struct device *dev, unsigned int reg)
	{
	struct rt5759_priv *priv = dev_get_drvdata(dev);

	if (reg <= RT5759_REG_DCDCSET)
	return true;

	if (priv->chip_type == CHIP_TYPE_RT5759A && reg == RT5759A_REG_WDTEN)
	return true;

	return false;
	}

	static const struct regmap_config rt5759_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = RT5759A_REG_WDTEN,
	.readable_reg = rt5759_is_accessible_reg,
	.writeable_reg = rt5759_is_accessible_reg,
	};

	static int rt5759_probe(struct i2c_client *i2c)
	{
	struct rt5759_priv *priv;
	int ret;

	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	priv->dev = &i2c->dev;
	priv->chip_type = (unsigned long)of_device_get_match_data(&i2c->dev);
	i2c_set_clientdata(i2c, priv);

	priv->regmap = devm_regmap_init_i2c(i2c, &rt5759_regmap_config);
	if (IS_ERR(priv->regmap)) {
	ret = PTR_ERR(priv->regmap);
	dev_err(&i2c->dev, "Failed to allocate regmap (%d)\n", ret);
	return ret;
	}

	ret = rt5759_manufacturer_check(priv);
	if (ret) {
	dev_err(&i2c->dev, "Failed to check device (%d)\n", ret);
	return ret;
	}

	ret = rt5759_init_device_property(priv);
	if (ret) {
	dev_err(&i2c->dev, "Failed to init device (%d)\n", ret);
	return ret;
	}

	return rt5759_regulator_register(priv);
	}

	static const struct of_device_id __maybe_unused rt5759_device_table[] = {
	{ .compatible = "richtek,rt5759", .data = (void *)CHIP_TYPE_RT5759 },
	{ .compatible = "richtek,rt5759a", .data = (void *)CHIP_TYPE_RT5759A },
	{}
	};
	MODULE_DEVICE_TABLE(of, rt5759_device_table);

	static struct i2c_driver rt5759_driver = {
	.driver = {
	.name = "rt5759",
	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
	.of_match_table = of_match_ptr(rt5759_device_table),
	},
	.probe = rt5759_probe,
	};
	module_i2c_driver(rt5759_driver);

	MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
	MODULE_DESCRIPTION("Richtek RT5759 Regulator Driver");
	MODULE_LICENSE("GPL v2");