drivers/regulator/max8907-regulator.c - maze/linux - Git at Google

 /*
  * max8907-regulator.c -- support regulators in max8907
  *
  * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
  * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
  *
  * Portions based on drivers/regulator/tps65910-regulator.c,
  *     Copyright 2010 Texas Instruments Inc.
  *     Author: Graeme Gregory <gg@slimlogic.co.uk>
  *     Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/max8907.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>

 #define MAX8907_II2RR_VERSION_MASK	0xF0
 #define MAX8907_II2RR_VERSION_REV_A	0x00
 #define MAX8907_II2RR_VERSION_REV_B	0x10
 #define MAX8907_II2RR_VERSION_REV_C	0x30

 struct max8907_regulator {
 	struct regulator_desc desc[MAX8907_NUM_REGULATORS];
 	struct regulator_dev *rdev[MAX8907_NUM_REGULATORS];
 };

 #define REG_MBATT() \
 	[MAX8907_MBATT] = { \
 		.name = "MBATT", \
 		.supply_name = "mbatt", \
 		.id = MAX8907_MBATT, \
 		.ops = &max8907_mbatt_ops, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
 	}

 #define REG_LDO(ids, supply, base, min, max, step) \
 	[MAX8907_##ids] = { \
 		.name = #ids, \
 		.supply_name = supply, \
 		.id = MAX8907_##ids, \
 		.n_voltages = ((max) - (min)) / (step) + 1, \
 		.ops = &max8907_ldo_ops, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
 		.min_uV = (min), \
 		.uV_step = (step), \
 		.vsel_reg = (base) + MAX8907_VOUT, \
 		.vsel_mask = 0x3f, \
 		.enable_reg = (base) + MAX8907_CTL, \
 		.enable_mask = MAX8907_MASK_LDO_EN, \
 	}

 #define REG_FIXED(ids, supply, voltage) \
 	[MAX8907_##ids] = { \
 		.name = #ids, \
 		.supply_name = supply, \
 		.id = MAX8907_##ids, \
 		.n_voltages = 1, \
 		.ops = &max8907_fixed_ops, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
 		.min_uV = (voltage), \
 	}

 #define REG_OUT5V(ids, supply, base, voltage) \
 	[MAX8907_##ids] = { \
 		.name = #ids, \
 		.supply_name = supply, \
 		.id = MAX8907_##ids, \
 		.n_voltages = 1, \
 		.ops = &max8907_out5v_ops, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
 		.min_uV = (voltage), \
 		.enable_reg = (base), \
 		.enable_mask = MAX8907_MASK_OUT5V_EN, \
 	}

 #define REG_BBAT(ids, supply, base, min, max, step) \
 	[MAX8907_##ids] = { \
 		.name = #ids, \
 		.supply_name = supply, \
 		.id = MAX8907_##ids, \
 		.n_voltages = ((max) - (min)) / (step) + 1, \
 		.ops = &max8907_bbat_ops, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
 		.min_uV = (min), \
 		.uV_step = (step), \
 		.vsel_reg = (base), \
 		.vsel_mask = MAX8907_MASK_VBBATTCV, \
 	}

 #define LDO_750_50(id, supply, base) REG_LDO(id, supply, (base), \
 			750000, 3900000, 50000)
 #define LDO_650_25(id, supply, base) REG_LDO(id, supply, (base), \
 			650000, 2225000, 25000)

 static struct regulator_ops max8907_mbatt_ops = {
 };

 static struct regulator_ops max8907_ldo_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,
 };

 static struct regulator_ops max8907_ldo_hwctl_ops = {
 	.list_voltage = regulator_list_voltage_linear,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 };

 static struct regulator_ops max8907_fixed_ops = {
 	.list_voltage = regulator_list_voltage_linear,
 };

 static struct regulator_ops max8907_out5v_ops = {
 	.list_voltage = regulator_list_voltage_linear,
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 	.is_enabled = regulator_is_enabled_regmap,
 };

 static struct regulator_ops max8907_out5v_hwctl_ops = {
 	.list_voltage = regulator_list_voltage_linear,
 };

 static struct regulator_ops max8907_bbat_ops = {
 	.list_voltage = regulator_list_voltage_linear,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 };

 static struct regulator_desc max8907_regulators[] = {
 	REG_MBATT(),
 	REG_LDO(SD1, "in-v1", MAX8907_REG_SDCTL1, 650000, 2225000, 25000),
 	REG_LDO(SD2, "in-v2", MAX8907_REG_SDCTL2, 637500, 1425000, 12500),
 	REG_LDO(SD3, "in-v3", MAX8907_REG_SDCTL3, 750000, 3900000, 50000),
 	LDO_750_50(LDO1, "in1", MAX8907_REG_LDOCTL1),
 	LDO_650_25(LDO2, "in2", MAX8907_REG_LDOCTL2),
 	LDO_650_25(LDO3, "in3", MAX8907_REG_LDOCTL3),
 	LDO_750_50(LDO4, "in4", MAX8907_REG_LDOCTL4),
 	LDO_750_50(LDO5, "in5", MAX8907_REG_LDOCTL5),
 	LDO_750_50(LDO6, "in6", MAX8907_REG_LDOCTL6),
 	LDO_750_50(LDO7, "in7", MAX8907_REG_LDOCTL7),
 	LDO_750_50(LDO8, "in8", MAX8907_REG_LDOCTL8),
 	LDO_750_50(LDO9, "in9", MAX8907_REG_LDOCTL9),
 	LDO_750_50(LDO10, "in10", MAX8907_REG_LDOCTL10),
 	LDO_750_50(LDO11, "in11", MAX8907_REG_LDOCTL11),
 	LDO_750_50(LDO12, "in12", MAX8907_REG_LDOCTL12),
 	LDO_750_50(LDO13, "in13", MAX8907_REG_LDOCTL13),
 	LDO_750_50(LDO14, "in14", MAX8907_REG_LDOCTL14),
 	LDO_750_50(LDO15, "in15", MAX8907_REG_LDOCTL15),
 	LDO_750_50(LDO16, "in16", MAX8907_REG_LDOCTL16),
 	LDO_650_25(LDO17, "in17", MAX8907_REG_LDOCTL17),
 	LDO_650_25(LDO18, "in18", MAX8907_REG_LDOCTL18),
 	LDO_750_50(LDO19, "in19", MAX8907_REG_LDOCTL19),
 	LDO_750_50(LDO20, "in20", MAX8907_REG_LDOCTL20),
 	REG_OUT5V(OUT5V, "mbatt", MAX8907_REG_OUT5VEN, 5000000),
 	REG_OUT5V(OUT33V, "mbatt",  MAX8907_REG_OUT33VEN, 3300000),
 	REG_BBAT(BBAT, "MBATT", MAX8907_REG_BBAT_CNFG,
 						2400000, 3000000, 200000),
 	REG_FIXED(SDBY, "MBATT", 1200000),
 	REG_FIXED(VRTC, "MBATT", 3300000),
 };

 #ifdef CONFIG_OF

 #define MATCH(_name, _id) \
 	[MAX8907_##_id] = { \
 		.name = #_name, \
 		.driver_data = (void *)&max8907_regulators[MAX8907_##_id], \
 	}

 static struct of_regulator_match max8907_matches[] = {
 	MATCH(mbatt, MBATT),
 	MATCH(sd1, SD1),
 	MATCH(sd2, SD2),
 	MATCH(sd3, SD3),
 	MATCH(ldo1, LDO1),
 	MATCH(ldo2, LDO2),
 	MATCH(ldo3, LDO3),
 	MATCH(ldo4, LDO4),
 	MATCH(ldo5, LDO5),
 	MATCH(ldo6, LDO6),
 	MATCH(ldo7, LDO7),
 	MATCH(ldo8, LDO8),
 	MATCH(ldo9, LDO9),
 	MATCH(ldo10, LDO10),
 	MATCH(ldo11, LDO11),
 	MATCH(ldo12, LDO12),
 	MATCH(ldo13, LDO13),
 	MATCH(ldo14, LDO14),
 	MATCH(ldo15, LDO15),
 	MATCH(ldo16, LDO16),
 	MATCH(ldo17, LDO17),
 	MATCH(ldo18, LDO18),
 	MATCH(ldo19, LDO19),
 	MATCH(ldo20, LDO20),
 	MATCH(out5v, OUT5V),
 	MATCH(out33v, OUT33V),
 	MATCH(bbat, BBAT),
 	MATCH(sdby, SDBY),
 	MATCH(vrtc, VRTC),
 };

 static int max8907_regulator_parse_dt(struct platform_device *pdev)
 {
 	struct device_node *np, *regulators;
 	int ret;

 	np = of_node_get(pdev->dev.parent->of_node);
 	if (!np)
 		return 0;

 	regulators = of_find_node_by_name(np, "regulators");
 	if (!regulators) {
 		dev_err(&pdev->dev, "regulators node not found\n");
 		return -EINVAL;
 	}

 	ret = of_regulator_match(&pdev->dev, regulators, max8907_matches,
 				 ARRAY_SIZE(max8907_matches));
 	of_node_put(regulators);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
 			ret);
 		return ret;
 	}

 	return 0;
 }

 static inline struct regulator_init_data *match_init_data(int index)
 {
 	return max8907_matches[index].init_data;
 }

 static inline struct device_node *match_of_node(int index)
 {
 	return max8907_matches[index].of_node;
 }
 #else
 static int max8907_regulator_parse_dt(struct platform_device *pdev)
 {
 	return 0;
 }

 static inline struct regulator_init_data *match_init_data(int index)
 {
 	return NULL;
 }

 static inline struct device_node *match_of_node(int index)
 {
 	return NULL;
 }
 #endif

 static int max8907_regulator_probe(struct platform_device *pdev)
 {
 	struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
 	struct max8907_platform_data *pdata = dev_get_platdata(max8907->dev);
 	int ret;
 	struct max8907_regulator *pmic;
 	unsigned int val;
 	int i;
 	struct regulator_config config = {};
 	struct regulator_init_data *idata;
 	const char *mbatt_rail_name = NULL;

 	ret = max8907_regulator_parse_dt(pdev);
 	if (ret)
 		return ret;

 	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
 	if (!pmic) {
 		dev_err(&pdev->dev, "Failed to alloc pmic\n");
 		return -ENOMEM;
 	}
 	platform_set_drvdata(pdev, pmic);

 	memcpy(pmic->desc, max8907_regulators, sizeof(pmic->desc));

 	/* Backwards compatibility with MAX8907B; SD1 uses different voltages */
 	regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val);
 	if ((val & MAX8907_II2RR_VERSION_MASK) ==
 	    MAX8907_II2RR_VERSION_REV_B) {
 		pmic->desc[MAX8907_SD1].min_uV = 637500;
 		pmic->desc[MAX8907_SD1].uV_step = 12500;
 		pmic->desc[MAX8907_SD1].n_voltages =
 						(1425000 - 637500) / 12500 + 1;
 	}

 	for (i = 0; i < MAX8907_NUM_REGULATORS; i++) {
 		config.dev = pdev->dev.parent;
 		if (pdata)
 			idata = pdata->init_data[i];
 		else
 			idata = match_init_data(i);
 		config.init_data = idata;
 		config.driver_data = pmic;
 		config.regmap = max8907->regmap_gen;
 		config.of_node = match_of_node(i);

 		switch (pmic->desc[i].id) {
 		case MAX8907_MBATT:
 			if (idata && idata->constraints.name)
 				mbatt_rail_name = idata->constraints.name;
 			else
 				mbatt_rail_name = pmic->desc[i].name;
 			break;
 		case MAX8907_BBAT:
 		case MAX8907_SDBY:
 		case MAX8907_VRTC:
 			idata->supply_regulator = mbatt_rail_name;
 			break;
 		}

 		if (pmic->desc[i].ops == &max8907_ldo_ops) {
 			regmap_read(config.regmap, pmic->desc[i].enable_reg,
 				    &val);
 			if ((val & MAX8907_MASK_LDO_SEQ) !=
 			    MAX8907_MASK_LDO_SEQ)
 				pmic->desc[i].ops = &max8907_ldo_hwctl_ops;
 		} else if (pmic->desc[i].ops == &max8907_out5v_ops) {
 			regmap_read(config.regmap, pmic->desc[i].enable_reg,
 				    &val);
 			if ((val & (MAX8907_MASK_OUT5V_VINEN |
 						MAX8907_MASK_OUT5V_ENSRC)) !=
 			    MAX8907_MASK_OUT5V_ENSRC)
 				pmic->desc[i].ops = &max8907_out5v_hwctl_ops;
 		}

 		pmic->rdev[i] = regulator_register(&pmic->desc[i], &config);
 		if (IS_ERR(pmic->rdev[i])) {
 			dev_err(&pdev->dev,
 				"failed to register %s regulator\n",
 				pmic->desc[i].name);
 			ret = PTR_ERR(pmic->rdev[i]);
 			goto err_unregister_regulator;
 		}
 	}

 	return 0;

 err_unregister_regulator:
 	while (--i >= 0)
 		regulator_unregister(pmic->rdev[i]);
 	return ret;
 }

 static int max8907_regulator_remove(struct platform_device *pdev)
 {
 	struct max8907_regulator *pmic = platform_get_drvdata(pdev);
 	int i;

 	for (i = 0; i < MAX8907_NUM_REGULATORS; i++)
 		regulator_unregister(pmic->rdev[i]);

 	return 0;
 }

 static struct platform_driver max8907_regulator_driver = {
 	.driver = {
 		   .name = "max8907-regulator",
 		   .owner = THIS_MODULE,
 		   },
 	.probe = max8907_regulator_probe,
 	.remove = max8907_regulator_remove,
 };

 static int __init max8907_regulator_init(void)
 {
 	return platform_driver_register(&max8907_regulator_driver);
 }

 subsys_initcall(max8907_regulator_init);

 static void __exit max8907_reg_exit(void)
 {
 	platform_driver_unregister(&max8907_regulator_driver);
 }

 module_exit(max8907_reg_exit);

 MODULE_DESCRIPTION("MAX8907 regulator driver");
 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:max8907-regulator");
	/*
	* max8907-regulator.c -- support regulators in max8907
	*
	* Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
	* Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
	*
	* Portions based on drivers/regulator/tps65910-regulator.c,
	* Copyright 2010 Texas Instruments Inc.
	* Author: Graeme Gregory <gg@slimlogic.co.uk>
	* Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/max8907.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/regulator/of_regulator.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>

	#define MAX8907_II2RR_VERSION_MASK 0xF0
	#define MAX8907_II2RR_VERSION_REV_A 0x00
	#define MAX8907_II2RR_VERSION_REV_B 0x10
	#define MAX8907_II2RR_VERSION_REV_C 0x30

	struct max8907_regulator {
	struct regulator_desc desc[MAX8907_NUM_REGULATORS];
	struct regulator_dev *rdev[MAX8907_NUM_REGULATORS];
	};

	#define REG_MBATT() \
	[MAX8907_MBATT] = { \
	.name = "MBATT", \
	.supply_name = "mbatt", \
	.id = MAX8907_MBATT, \
	.ops = &max8907_mbatt_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	}

	#define REG_LDO(ids, supply, base, min, max, step) \
	[MAX8907_##ids] = { \
	.name = #ids, \
	.supply_name = supply, \
	.id = MAX8907_##ids, \
	.n_voltages = ((max) - (min)) / (step) + 1, \
	.ops = &max8907_ldo_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = (min), \
	.uV_step = (step), \
	.vsel_reg = (base) + MAX8907_VOUT, \
	.vsel_mask = 0x3f, \
	.enable_reg = (base) + MAX8907_CTL, \
	.enable_mask = MAX8907_MASK_LDO_EN, \
	}

	#define REG_FIXED(ids, supply, voltage) \
	[MAX8907_##ids] = { \
	.name = #ids, \
	.supply_name = supply, \
	.id = MAX8907_##ids, \
	.n_voltages = 1, \
	.ops = &max8907_fixed_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = (voltage), \
	}

	#define REG_OUT5V(ids, supply, base, voltage) \
	[MAX8907_##ids] = { \
	.name = #ids, \
	.supply_name = supply, \
	.id = MAX8907_##ids, \
	.n_voltages = 1, \
	.ops = &max8907_out5v_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = (voltage), \
	.enable_reg = (base), \
	.enable_mask = MAX8907_MASK_OUT5V_EN, \
	}

	#define REG_BBAT(ids, supply, base, min, max, step) \
	[MAX8907_##ids] = { \
	.name = #ids, \
	.supply_name = supply, \
	.id = MAX8907_##ids, \
	.n_voltages = ((max) - (min)) / (step) + 1, \
	.ops = &max8907_bbat_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = (min), \
	.uV_step = (step), \
	.vsel_reg = (base), \
	.vsel_mask = MAX8907_MASK_VBBATTCV, \
	}

	#define LDO_750_50(id, supply, base) REG_LDO(id, supply, (base), \
	750000, 3900000, 50000)
	#define LDO_650_25(id, supply, base) REG_LDO(id, supply, (base), \
	650000, 2225000, 25000)

	static struct regulator_ops max8907_mbatt_ops = {
	};

	static struct regulator_ops max8907_ldo_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,
	};

	static struct regulator_ops max8907_ldo_hwctl_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	};

	static struct regulator_ops max8907_fixed_ops = {
	.list_voltage = regulator_list_voltage_linear,
	};

	static struct regulator_ops max8907_out5v_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	};

	static struct regulator_ops max8907_out5v_hwctl_ops = {
	.list_voltage = regulator_list_voltage_linear,
	};

	static struct regulator_ops max8907_bbat_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	};

	static struct regulator_desc max8907_regulators[] = {
	REG_MBATT(),
	REG_LDO(SD1, "in-v1", MAX8907_REG_SDCTL1, 650000, 2225000, 25000),
	REG_LDO(SD2, "in-v2", MAX8907_REG_SDCTL2, 637500, 1425000, 12500),
	REG_LDO(SD3, "in-v3", MAX8907_REG_SDCTL3, 750000, 3900000, 50000),
	LDO_750_50(LDO1, "in1", MAX8907_REG_LDOCTL1),
	LDO_650_25(LDO2, "in2", MAX8907_REG_LDOCTL2),
	LDO_650_25(LDO3, "in3", MAX8907_REG_LDOCTL3),
	LDO_750_50(LDO4, "in4", MAX8907_REG_LDOCTL4),
	LDO_750_50(LDO5, "in5", MAX8907_REG_LDOCTL5),
	LDO_750_50(LDO6, "in6", MAX8907_REG_LDOCTL6),
	LDO_750_50(LDO7, "in7", MAX8907_REG_LDOCTL7),
	LDO_750_50(LDO8, "in8", MAX8907_REG_LDOCTL8),
	LDO_750_50(LDO9, "in9", MAX8907_REG_LDOCTL9),
	LDO_750_50(LDO10, "in10", MAX8907_REG_LDOCTL10),
	LDO_750_50(LDO11, "in11", MAX8907_REG_LDOCTL11),
	LDO_750_50(LDO12, "in12", MAX8907_REG_LDOCTL12),
	LDO_750_50(LDO13, "in13", MAX8907_REG_LDOCTL13),
	LDO_750_50(LDO14, "in14", MAX8907_REG_LDOCTL14),
	LDO_750_50(LDO15, "in15", MAX8907_REG_LDOCTL15),
	LDO_750_50(LDO16, "in16", MAX8907_REG_LDOCTL16),
	LDO_650_25(LDO17, "in17", MAX8907_REG_LDOCTL17),
	LDO_650_25(LDO18, "in18", MAX8907_REG_LDOCTL18),
	LDO_750_50(LDO19, "in19", MAX8907_REG_LDOCTL19),
	LDO_750_50(LDO20, "in20", MAX8907_REG_LDOCTL20),
	REG_OUT5V(OUT5V, "mbatt", MAX8907_REG_OUT5VEN, 5000000),
	REG_OUT5V(OUT33V, "mbatt", MAX8907_REG_OUT33VEN, 3300000),
	REG_BBAT(BBAT, "MBATT", MAX8907_REG_BBAT_CNFG,
	2400000, 3000000, 200000),
	REG_FIXED(SDBY, "MBATT", 1200000),
	REG_FIXED(VRTC, "MBATT", 3300000),
	};

	#ifdef CONFIG_OF

	#define MATCH(_name, _id) \
	[MAX8907_##_id] = { \
	.name = #_name, \
	.driver_data = (void *)&max8907_regulators[MAX8907_##_id], \
	}

	static struct of_regulator_match max8907_matches[] = {
	MATCH(mbatt, MBATT),
	MATCH(sd1, SD1),
	MATCH(sd2, SD2),
	MATCH(sd3, SD3),
	MATCH(ldo1, LDO1),
	MATCH(ldo2, LDO2),
	MATCH(ldo3, LDO3),
	MATCH(ldo4, LDO4),
	MATCH(ldo5, LDO5),
	MATCH(ldo6, LDO6),
	MATCH(ldo7, LDO7),
	MATCH(ldo8, LDO8),
	MATCH(ldo9, LDO9),
	MATCH(ldo10, LDO10),
	MATCH(ldo11, LDO11),
	MATCH(ldo12, LDO12),
	MATCH(ldo13, LDO13),
	MATCH(ldo14, LDO14),
	MATCH(ldo15, LDO15),
	MATCH(ldo16, LDO16),
	MATCH(ldo17, LDO17),
	MATCH(ldo18, LDO18),
	MATCH(ldo19, LDO19),
	MATCH(ldo20, LDO20),
	MATCH(out5v, OUT5V),
	MATCH(out33v, OUT33V),
	MATCH(bbat, BBAT),
	MATCH(sdby, SDBY),
	MATCH(vrtc, VRTC),
	};

	static int max8907_regulator_parse_dt(struct platform_device *pdev)
	{
	struct device_node np, regulators;
	int ret;

	np = of_node_get(pdev->dev.parent->of_node);
	if (!np)
	return 0;

	regulators = of_find_node_by_name(np, "regulators");
	if (!regulators) {
	dev_err(&pdev->dev, "regulators node not found\n");
	return -EINVAL;
	}

	ret = of_regulator_match(&pdev->dev, regulators, max8907_matches,
	ARRAY_SIZE(max8907_matches));
	of_node_put(regulators);
	if (ret < 0) {
	dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
	ret);
	return ret;
	}

	return 0;
	}

	static inline struct regulator_init_data *match_init_data(int index)
	{
	return max8907_matches[index].init_data;
	}

	static inline struct device_node *match_of_node(int index)
	{
	return max8907_matches[index].of_node;
	}
	#else
	static int max8907_regulator_parse_dt(struct platform_device *pdev)
	{
	return 0;
	}

	static inline struct regulator_init_data *match_init_data(int index)
	{
	return NULL;
	}

	static inline struct device_node *match_of_node(int index)
	{
	return NULL;
	}
	#endif

	static int max8907_regulator_probe(struct platform_device *pdev)
	{
	struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
	struct max8907_platform_data *pdata = dev_get_platdata(max8907->dev);
	int ret;
	struct max8907_regulator *pmic;
	unsigned int val;
	int i;
	struct regulator_config config = {};
	struct regulator_init_data *idata;
	const char *mbatt_rail_name = NULL;

	ret = max8907_regulator_parse_dt(pdev);
	if (ret)
	return ret;

	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
	if (!pmic) {
	dev_err(&pdev->dev, "Failed to alloc pmic\n");
	return -ENOMEM;
	}
	platform_set_drvdata(pdev, pmic);

	memcpy(pmic->desc, max8907_regulators, sizeof(pmic->desc));

	/* Backwards compatibility with MAX8907B; SD1 uses different voltages */
	regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val);
	if ((val & MAX8907_II2RR_VERSION_MASK) ==
	MAX8907_II2RR_VERSION_REV_B) {
	pmic->desc[MAX8907_SD1].min_uV = 637500;
	pmic->desc[MAX8907_SD1].uV_step = 12500;
	pmic->desc[MAX8907_SD1].n_voltages =
	(1425000 - 637500) / 12500 + 1;
	}

	for (i = 0; i < MAX8907_NUM_REGULATORS; i++) {
	config.dev = pdev->dev.parent;
	if (pdata)
	idata = pdata->init_data[i];
	else
	idata = match_init_data(i);
	config.init_data = idata;
	config.driver_data = pmic;
	config.regmap = max8907->regmap_gen;
	config.of_node = match_of_node(i);

	switch (pmic->desc[i].id) {
	case MAX8907_MBATT:
	if (idata && idata->constraints.name)
	mbatt_rail_name = idata->constraints.name;
	else
	mbatt_rail_name = pmic->desc[i].name;
	break;
	case MAX8907_BBAT:
	case MAX8907_SDBY:
	case MAX8907_VRTC:
	idata->supply_regulator = mbatt_rail_name;
	break;
	}

	if (pmic->desc[i].ops == &max8907_ldo_ops) {
	regmap_read(config.regmap, pmic->desc[i].enable_reg,
	&val);
	if ((val & MAX8907_MASK_LDO_SEQ) !=
	MAX8907_MASK_LDO_SEQ)
	pmic->desc[i].ops = &max8907_ldo_hwctl_ops;
	} else if (pmic->desc[i].ops == &max8907_out5v_ops) {
	regmap_read(config.regmap, pmic->desc[i].enable_reg,
	&val);
	if ((val & (MAX8907_MASK_OUT5V_VINEN \|
	MAX8907_MASK_OUT5V_ENSRC)) !=
	MAX8907_MASK_OUT5V_ENSRC)
	pmic->desc[i].ops = &max8907_out5v_hwctl_ops;
	}

	pmic->rdev[i] = regulator_register(&pmic->desc[i], &config);
	if (IS_ERR(pmic->rdev[i])) {
	dev_err(&pdev->dev,
	"failed to register %s regulator\n",
	pmic->desc[i].name);
	ret = PTR_ERR(pmic->rdev[i]);
	goto err_unregister_regulator;
	}
	}

	return 0;

	err_unregister_regulator:
	while (--i >= 0)
	regulator_unregister(pmic->rdev[i]);
	return ret;
	}

	static int max8907_regulator_remove(struct platform_device *pdev)
	{
	struct max8907_regulator *pmic = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < MAX8907_NUM_REGULATORS; i++)
	regulator_unregister(pmic->rdev[i]);

	return 0;
	}

	static struct platform_driver max8907_regulator_driver = {
	.driver = {
	.name = "max8907-regulator",
	.owner = THIS_MODULE,
	},
	.probe = max8907_regulator_probe,
	.remove = max8907_regulator_remove,
	};

	static int __init max8907_regulator_init(void)
	{
	return platform_driver_register(&max8907_regulator_driver);
	}

	subsys_initcall(max8907_regulator_init);

	static void __exit max8907_reg_exit(void)
	{
	platform_driver_unregister(&max8907_regulator_driver);
	}

	module_exit(max8907_reg_exit);

	MODULE_DESCRIPTION("MAX8907 regulator driver");
	MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:max8907-regulator");