drivers/regulator/act8945a-regulator.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Voltage regulation driver for active-semi ACT8945A PMIC
  *
  * Copyright (C) 2015 Atmel Corporation
  *
  * Author: Wenyou Yang <wenyou.yang@atmel.com>
  */

 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <dt-bindings/regulator/active-semi,8945a-regulator.h>

 /**
  * ACT8945A Global Register Map.
  */
 #define ACT8945A_SYS_MODE	0x00
 #define ACT8945A_SYS_CTRL	0x01
 #define ACT8945A_SYS_UNLK_REGS	0x0b
 #define ACT8945A_DCDC1_VSET1	0x20
 #define ACT8945A_DCDC1_VSET2	0x21
 #define ACT8945A_DCDC1_CTRL	0x22
 #define ACT8945A_DCDC1_SUS	0x24
 #define ACT8945A_DCDC2_VSET1	0x30
 #define ACT8945A_DCDC2_VSET2	0x31
 #define ACT8945A_DCDC2_CTRL	0x32
 #define ACT8945A_DCDC2_SUS	0x34
 #define ACT8945A_DCDC3_VSET1	0x40
 #define ACT8945A_DCDC3_VSET2	0x41
 #define ACT8945A_DCDC3_CTRL	0x42
 #define ACT8945A_DCDC3_SUS	0x44
 #define ACT8945A_LDO1_VSET	0x50
 #define ACT8945A_LDO1_CTRL	0x51
 #define ACT8945A_LDO1_SUS	0x52
 #define ACT8945A_LDO2_VSET	0x54
 #define ACT8945A_LDO2_CTRL	0x55
 #define ACT8945A_LDO2_SUS	0x56
 #define ACT8945A_LDO3_VSET	0x60
 #define ACT8945A_LDO3_CTRL	0x61
 #define ACT8945A_LDO3_SUS	0x62
 #define ACT8945A_LDO4_VSET	0x64
 #define ACT8945A_LDO4_CTRL	0x65
 #define ACT8945A_LDO4_SUS	0x66

 /**
  * Field Definitions.
  */
 #define ACT8945A_ENA		0x80	/* ON - [7] */
 #define ACT8945A_VSEL_MASK	0x3F	/* VSET - [5:0] */

 /**
  * ACT8945A Voltage Number
  */
 #define ACT8945A_VOLTAGE_NUM	64

 enum {
 	ACT8945A_ID_DCDC1,
 	ACT8945A_ID_DCDC2,
 	ACT8945A_ID_DCDC3,
 	ACT8945A_ID_LDO1,
 	ACT8945A_ID_LDO2,
 	ACT8945A_ID_LDO3,
 	ACT8945A_ID_LDO4,
 	ACT8945A_ID_MAX,
 };

 struct act8945a_pmic {
 	struct regmap *regmap;
 	u32 op_mode[ACT8945A_ID_MAX];
 };

 static const struct regulator_linear_range act8945a_voltage_ranges[] = {
 	REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
 	REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
 	REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
 };

 static int act8945a_set_suspend_state(struct regulator_dev *rdev, bool enable)
 {
 	struct regmap *regmap = rdev->regmap;
 	int id = rdev_get_id(rdev);
 	int reg, val;

 	switch (id) {
 	case ACT8945A_ID_DCDC1:
 		reg = ACT8945A_DCDC1_SUS;
 		val = 0xa8;
 		break;
 	case ACT8945A_ID_DCDC2:
 		reg = ACT8945A_DCDC2_SUS;
 		val = 0xa8;
 		break;
 	case ACT8945A_ID_DCDC3:
 		reg = ACT8945A_DCDC3_SUS;
 		val = 0xa8;
 		break;
 	case ACT8945A_ID_LDO1:
 		reg = ACT8945A_LDO1_SUS;
 		val = 0xe8;
 		break;
 	case ACT8945A_ID_LDO2:
 		reg = ACT8945A_LDO2_SUS;
 		val = 0xe8;
 		break;
 	case ACT8945A_ID_LDO3:
 		reg = ACT8945A_LDO3_SUS;
 		val = 0xe8;
 		break;
 	case ACT8945A_ID_LDO4:
 		reg = ACT8945A_LDO4_SUS;
 		val = 0xe8;
 		break;
 	default:
 		return -EINVAL;
 	}

 	if (enable)
 		val |= BIT(4);

 	/*
 	 * Ask the PMIC to enable/disable this output when entering hibernate
 	 * mode.
 	 */
 	return regmap_write(regmap, reg, val);
 }

 static int act8945a_set_suspend_enable(struct regulator_dev *rdev)
 {
 	return act8945a_set_suspend_state(rdev, true);
 }

 static int act8945a_set_suspend_disable(struct regulator_dev *rdev)
 {
 	return act8945a_set_suspend_state(rdev, false);
 }

 static unsigned int act8945a_of_map_mode(unsigned int mode)
 {
 	switch (mode) {
 	case ACT8945A_REGULATOR_MODE_FIXED:
 	case ACT8945A_REGULATOR_MODE_NORMAL:
 		return REGULATOR_MODE_NORMAL;
 	case ACT8945A_REGULATOR_MODE_LOWPOWER:
 		return REGULATOR_MODE_STANDBY;
 	default:
 		return REGULATOR_MODE_INVALID;
 	}
 }

 static int act8945a_set_mode(struct regulator_dev *rdev, unsigned int mode)
 {
 	struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
 	struct regmap *regmap = rdev->regmap;
 	int id = rdev_get_id(rdev);
 	int reg, ret, val = 0;

 	switch (id) {
 	case ACT8945A_ID_DCDC1:
 		reg = ACT8945A_DCDC1_CTRL;
 		break;
 	case ACT8945A_ID_DCDC2:
 		reg = ACT8945A_DCDC2_CTRL;
 		break;
 	case ACT8945A_ID_DCDC3:
 		reg = ACT8945A_DCDC3_CTRL;
 		break;
 	case ACT8945A_ID_LDO1:
 		reg = ACT8945A_LDO1_CTRL;
 		break;
 	case ACT8945A_ID_LDO2:
 		reg = ACT8945A_LDO2_CTRL;
 		break;
 	case ACT8945A_ID_LDO3:
 		reg = ACT8945A_LDO3_CTRL;
 		break;
 	case ACT8945A_ID_LDO4:
 		reg = ACT8945A_LDO4_CTRL;
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (mode) {
 	case REGULATOR_MODE_STANDBY:
 		if (id > ACT8945A_ID_DCDC3)
 			val = BIT(5);
 		break;
 	case REGULATOR_MODE_NORMAL:
 		if (id <= ACT8945A_ID_DCDC3)
 			val = BIT(5);
 		break;
 	default:
 		return -EINVAL;
 	}

 	ret = regmap_update_bits(regmap, reg, BIT(5), val);
 	if (ret)
 		return ret;

 	act8945a->op_mode[id] = mode;

 	return 0;
 }

 static unsigned int act8945a_get_mode(struct regulator_dev *rdev)
 {
 	struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
 	int id = rdev_get_id(rdev);

 	if (id < ACT8945A_ID_DCDC1 || id >= ACT8945A_ID_MAX)
 		return -EINVAL;

 	return act8945a->op_mode[id];
 }

 static const struct regulator_ops act8945a_ops = {
 	.list_voltage		= regulator_list_voltage_linear_range,
 	.map_voltage		= regulator_map_voltage_linear_range,
 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 	.enable			= regulator_enable_regmap,
 	.disable		= regulator_disable_regmap,
 	.set_mode		= act8945a_set_mode,
 	.get_mode		= act8945a_get_mode,
 	.is_enabled		= regulator_is_enabled_regmap,
 	.set_suspend_enable	= act8945a_set_suspend_enable,
 	.set_suspend_disable	= act8945a_set_suspend_disable,
 };

 #define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply)		\
 	[_family##_ID_##_id] = {					\
 		.name			= _name,			\
 		.supply_name		= _supply,			\
 		.of_match		= of_match_ptr("REG_"#_id),	\
 		.of_map_mode		= act8945a_of_map_mode,		\
 		.regulators_node	= of_match_ptr("regulators"),	\
 		.id			= _family##_ID_##_id,		\
 		.type			= REGULATOR_VOLTAGE,		\
 		.ops			= &act8945a_ops,		\
 		.n_voltages		= ACT8945A_VOLTAGE_NUM,		\
 		.linear_ranges		= act8945a_voltage_ranges,	\
 		.n_linear_ranges	= ARRAY_SIZE(act8945a_voltage_ranges), \
 		.vsel_reg		= _family##_##_id##_##_vsel_reg, \
 		.vsel_mask		= ACT8945A_VSEL_MASK,		\
 		.enable_reg		= _family##_##_id##_CTRL,	\
 		.enable_mask		= ACT8945A_ENA,			\
 		.owner			= THIS_MODULE,			\
 	}

 static const struct regulator_desc act8945a_regulators[] = {
 	ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET1, "vp1"),
 	ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET1, "vp2"),
 	ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET1, "vp3"),
 	ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
 	ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
 	ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
 	ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
 };

 static const struct regulator_desc act8945a_alt_regulators[] = {
 	ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET2, "vp1"),
 	ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET2, "vp2"),
 	ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET2, "vp3"),
 	ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
 	ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
 	ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
 	ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
 };

 static int act8945a_pmic_probe(struct platform_device *pdev)
 {
 	struct regulator_config config = { };
 	const struct regulator_desc *regulators;
 	struct act8945a_pmic *act8945a;
 	struct regulator_dev *rdev;
 	int i, num_regulators;
 	bool voltage_select;

 	act8945a = devm_kzalloc(&pdev->dev, sizeof(*act8945a), GFP_KERNEL);
 	if (!act8945a)
 		return -ENOMEM;

 	act8945a->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 	if (!act8945a->regmap) {
 		dev_err(&pdev->dev,
 			"could not retrieve regmap from parent device\n");
 		return -EINVAL;
 	}

 	voltage_select = of_property_read_bool(pdev->dev.parent->of_node,
 					       "active-semi,vsel-high");

 	if (voltage_select) {
 		regulators = act8945a_alt_regulators;
 		num_regulators = ARRAY_SIZE(act8945a_alt_regulators);
 	} else {
 		regulators = act8945a_regulators;
 		num_regulators = ARRAY_SIZE(act8945a_regulators);
 	}

 	config.dev = &pdev->dev;
 	config.dev->of_node = pdev->dev.parent->of_node;
 	config.driver_data = act8945a;
 	for (i = 0; i < num_regulators; i++) {
 		rdev = devm_regulator_register(&pdev->dev, &regulators[i],
 					       &config);
 		if (IS_ERR(rdev)) {
 			dev_err(&pdev->dev,
 				"failed to register %s regulator\n",
 				regulators[i].name);
 			return PTR_ERR(rdev);
 		}
 	}

 	platform_set_drvdata(pdev, act8945a);

 	/* Unlock expert registers. */
 	return regmap_write(act8945a->regmap, ACT8945A_SYS_UNLK_REGS, 0xef);
 }

 static int __maybe_unused act8945a_suspend(struct device *pdev)
 {
 	struct act8945a_pmic *act8945a = dev_get_drvdata(pdev);

 	/*
 	 * Ask the PMIC to enter the suspend mode on the next PWRHLD
 	 * transition.
 	 */
 	return regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x42);
 }

 static SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL);

 static void act8945a_pmic_shutdown(struct platform_device *pdev)
 {
 	struct act8945a_pmic *act8945a = platform_get_drvdata(pdev);

 	/*
 	 * Ask the PMIC to shutdown everything on the next PWRHLD transition.
 	 */
 	regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x0);
 }

 static struct platform_driver act8945a_pmic_driver = {
 	.driver = {
 		.name = "act8945a-regulator",
 		.pm = &act8945a_pm,
 	},
 	.probe = act8945a_pmic_probe,
 	.shutdown = act8945a_pmic_shutdown,
 };
 module_platform_driver(act8945a_pmic_driver);

 MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver");
 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Voltage regulation driver for active-semi ACT8945A PMIC
	*
	* Copyright (C) 2015 Atmel Corporation
	*
	* Author: Wenyou Yang <wenyou.yang@atmel.com>
	*/

	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <dt-bindings/regulator/active-semi,8945a-regulator.h>

	/**
	* ACT8945A Global Register Map.
	*/
	#define ACT8945A_SYS_MODE 0x00
	#define ACT8945A_SYS_CTRL 0x01
	#define ACT8945A_SYS_UNLK_REGS 0x0b
	#define ACT8945A_DCDC1_VSET1 0x20
	#define ACT8945A_DCDC1_VSET2 0x21
	#define ACT8945A_DCDC1_CTRL 0x22
	#define ACT8945A_DCDC1_SUS 0x24
	#define ACT8945A_DCDC2_VSET1 0x30
	#define ACT8945A_DCDC2_VSET2 0x31
	#define ACT8945A_DCDC2_CTRL 0x32
	#define ACT8945A_DCDC2_SUS 0x34
	#define ACT8945A_DCDC3_VSET1 0x40
	#define ACT8945A_DCDC3_VSET2 0x41
	#define ACT8945A_DCDC3_CTRL 0x42
	#define ACT8945A_DCDC3_SUS 0x44
	#define ACT8945A_LDO1_VSET 0x50
	#define ACT8945A_LDO1_CTRL 0x51
	#define ACT8945A_LDO1_SUS 0x52
	#define ACT8945A_LDO2_VSET 0x54
	#define ACT8945A_LDO2_CTRL 0x55
	#define ACT8945A_LDO2_SUS 0x56
	#define ACT8945A_LDO3_VSET 0x60
	#define ACT8945A_LDO3_CTRL 0x61
	#define ACT8945A_LDO3_SUS 0x62
	#define ACT8945A_LDO4_VSET 0x64
	#define ACT8945A_LDO4_CTRL 0x65
	#define ACT8945A_LDO4_SUS 0x66

	/**
	* Field Definitions.
	*/
	#define ACT8945A_ENA 0x80 /* ON - [7] */
	#define ACT8945A_VSEL_MASK 0x3F /* VSET - [5:0] */

	/**
	* ACT8945A Voltage Number
	*/
	#define ACT8945A_VOLTAGE_NUM 64

	enum {
	ACT8945A_ID_DCDC1,
	ACT8945A_ID_DCDC2,
	ACT8945A_ID_DCDC3,
	ACT8945A_ID_LDO1,
	ACT8945A_ID_LDO2,
	ACT8945A_ID_LDO3,
	ACT8945A_ID_LDO4,
	ACT8945A_ID_MAX,
	};

	struct act8945a_pmic {
	struct regmap *regmap;
	u32 op_mode[ACT8945A_ID_MAX];
	};

	static const struct regulator_linear_range act8945a_voltage_ranges[] = {
	REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
	REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
	REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
	};

	static int act8945a_set_suspend_state(struct regulator_dev *rdev, bool enable)
	{
	struct regmap *regmap = rdev->regmap;
	int id = rdev_get_id(rdev);
	int reg, val;

	switch (id) {
	case ACT8945A_ID_DCDC1:
	reg = ACT8945A_DCDC1_SUS;
	val = 0xa8;
	break;
	case ACT8945A_ID_DCDC2:
	reg = ACT8945A_DCDC2_SUS;
	val = 0xa8;
	break;
	case ACT8945A_ID_DCDC3:
	reg = ACT8945A_DCDC3_SUS;
	val = 0xa8;
	break;
	case ACT8945A_ID_LDO1:
	reg = ACT8945A_LDO1_SUS;
	val = 0xe8;
	break;
	case ACT8945A_ID_LDO2:
	reg = ACT8945A_LDO2_SUS;
	val = 0xe8;
	break;
	case ACT8945A_ID_LDO3:
	reg = ACT8945A_LDO3_SUS;
	val = 0xe8;
	break;
	case ACT8945A_ID_LDO4:
	reg = ACT8945A_LDO4_SUS;
	val = 0xe8;
	break;
	default:
	return -EINVAL;
	}

	if (enable)
	val \|= BIT(4);

	/*
	* Ask the PMIC to enable/disable this output when entering hibernate
	* mode.
	*/
	return regmap_write(regmap, reg, val);
	}

	static int act8945a_set_suspend_enable(struct regulator_dev *rdev)
	{
	return act8945a_set_suspend_state(rdev, true);
	}

	static int act8945a_set_suspend_disable(struct regulator_dev *rdev)
	{
	return act8945a_set_suspend_state(rdev, false);
	}

	static unsigned int act8945a_of_map_mode(unsigned int mode)
	{
	switch (mode) {
	case ACT8945A_REGULATOR_MODE_FIXED:
	case ACT8945A_REGULATOR_MODE_NORMAL:
	return REGULATOR_MODE_NORMAL;
	case ACT8945A_REGULATOR_MODE_LOWPOWER:
	return REGULATOR_MODE_STANDBY;
	default:
	return REGULATOR_MODE_INVALID;
	}
	}

	static int act8945a_set_mode(struct regulator_dev *rdev, unsigned int mode)
	{
	struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
	struct regmap *regmap = rdev->regmap;
	int id = rdev_get_id(rdev);
	int reg, ret, val = 0;

	switch (id) {
	case ACT8945A_ID_DCDC1:
	reg = ACT8945A_DCDC1_CTRL;
	break;
	case ACT8945A_ID_DCDC2:
	reg = ACT8945A_DCDC2_CTRL;
	break;
	case ACT8945A_ID_DCDC3:
	reg = ACT8945A_DCDC3_CTRL;
	break;
	case ACT8945A_ID_LDO1:
	reg = ACT8945A_LDO1_CTRL;
	break;
	case ACT8945A_ID_LDO2:
	reg = ACT8945A_LDO2_CTRL;
	break;
	case ACT8945A_ID_LDO3:
	reg = ACT8945A_LDO3_CTRL;
	break;
	case ACT8945A_ID_LDO4:
	reg = ACT8945A_LDO4_CTRL;
	break;
	default:
	return -EINVAL;
	}

	switch (mode) {
	case REGULATOR_MODE_STANDBY:
	if (id > ACT8945A_ID_DCDC3)
	val = BIT(5);
	break;
	case REGULATOR_MODE_NORMAL:
	if (id <= ACT8945A_ID_DCDC3)
	val = BIT(5);
	break;
	default:
	return -EINVAL;
	}

	ret = regmap_update_bits(regmap, reg, BIT(5), val);
	if (ret)
	return ret;

	act8945a->op_mode[id] = mode;

	return 0;
	}

	static unsigned int act8945a_get_mode(struct regulator_dev *rdev)
	{
	struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);

	if (id < ACT8945A_ID_DCDC1 \|\| id >= ACT8945A_ID_MAX)
	return -EINVAL;

	return act8945a->op_mode[id];
	}

	static const struct regulator_ops act8945a_ops = {
	.list_voltage = regulator_list_voltage_linear_range,
	.map_voltage = regulator_map_voltage_linear_range,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.set_mode = act8945a_set_mode,
	.get_mode = act8945a_get_mode,
	.is_enabled = regulator_is_enabled_regmap,
	.set_suspend_enable = act8945a_set_suspend_enable,
	.set_suspend_disable = act8945a_set_suspend_disable,
	};

	#define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply) \
	[_family##_ID_##_id] = { \
	.name = _name, \
	.supply_name = _supply, \
	.of_match = of_match_ptr("REG_"#_id), \
	.of_map_mode = act8945a_of_map_mode, \
	.regulators_node = of_match_ptr("regulators"), \
	.id = _family##_ID_##_id, \
	.type = REGULATOR_VOLTAGE, \
	.ops = &act8945a_ops, \
	.n_voltages = ACT8945A_VOLTAGE_NUM, \
	.linear_ranges = act8945a_voltage_ranges, \
	.n_linear_ranges = ARRAY_SIZE(act8945a_voltage_ranges), \
	.vsel_reg = _family##_##_id##_##_vsel_reg, \
	.vsel_mask = ACT8945A_VSEL_MASK, \
	.enable_reg = _family##_##_id##_CTRL, \
	.enable_mask = ACT8945A_ENA, \
	.owner = THIS_MODULE, \
	}

	static const struct regulator_desc act8945a_regulators[] = {
	ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET1, "vp1"),
	ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET1, "vp2"),
	ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET1, "vp3"),
	ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
	ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
	ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
	ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
	};

	static const struct regulator_desc act8945a_alt_regulators[] = {
	ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET2, "vp1"),
	ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET2, "vp2"),
	ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET2, "vp3"),
	ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
	ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
	ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
	ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
	};

	static int act8945a_pmic_probe(struct platform_device *pdev)
	{
	struct regulator_config config = { };
	const struct regulator_desc *regulators;
	struct act8945a_pmic *act8945a;
	struct regulator_dev *rdev;
	int i, num_regulators;
	bool voltage_select;

	act8945a = devm_kzalloc(&pdev->dev, sizeof(*act8945a), GFP_KERNEL);
	if (!act8945a)
	return -ENOMEM;

	act8945a->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!act8945a->regmap) {
	dev_err(&pdev->dev,
	"could not retrieve regmap from parent device\n");
	return -EINVAL;
	}

	voltage_select = of_property_read_bool(pdev->dev.parent->of_node,
	"active-semi,vsel-high");

	if (voltage_select) {
	regulators = act8945a_alt_regulators;
	num_regulators = ARRAY_SIZE(act8945a_alt_regulators);
	} else {
	regulators = act8945a_regulators;
	num_regulators = ARRAY_SIZE(act8945a_regulators);
	}

	config.dev = &pdev->dev;
	config.dev->of_node = pdev->dev.parent->of_node;
	config.driver_data = act8945a;
	for (i = 0; i < num_regulators; i++) {
	rdev = devm_regulator_register(&pdev->dev, &regulators[i],
	&config);
	if (IS_ERR(rdev)) {
	dev_err(&pdev->dev,
	"failed to register %s regulator\n",
	regulators[i].name);
	return PTR_ERR(rdev);
	}
	}

	platform_set_drvdata(pdev, act8945a);

	/* Unlock expert registers. */
	return regmap_write(act8945a->regmap, ACT8945A_SYS_UNLK_REGS, 0xef);
	}

	static int __maybe_unused act8945a_suspend(struct device *pdev)
	{
	struct act8945a_pmic *act8945a = dev_get_drvdata(pdev);

	/*
	* Ask the PMIC to enter the suspend mode on the next PWRHLD
	* transition.
	*/
	return regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x42);
	}

	static SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL);

	static void act8945a_pmic_shutdown(struct platform_device *pdev)
	{
	struct act8945a_pmic *act8945a = platform_get_drvdata(pdev);

	/*
	* Ask the PMIC to shutdown everything on the next PWRHLD transition.
	*/
	regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x0);
	}

	static struct platform_driver act8945a_pmic_driver = {
	.driver = {
	.name = "act8945a-regulator",
	.pm = &act8945a_pm,
	},
	.probe = act8945a_pmic_probe,
	.shutdown = act8945a_pmic_shutdown,
	};
	module_platform_driver(act8945a_pmic_driver);

	MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver");
	MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
	MODULE_LICENSE("GPL");