[deliverable/linux.git] / drivers / regulator / as3711-regulator.c

/*
 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
 *
 * Copyright (C) 2012 Renesas Electronics Corporation
 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the version 2 of the GNU General Public License as
 * published by the Free Software Foundation
 */

#include <linux/err.h>
#include <linux/init.h>
#include <linux/mfd/as3711.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/of_regulator.h>
#include <linux/slab.h>

struct as3711_regulator_info {
	struct regulator_desc	desc;
	unsigned int		max_uV;
};

struct as3711_regulator {
	struct as3711_regulator_info *reg_info;
	struct regulator_dev *rdev;
};

/*
 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
 * FAST:	sdX_fast=1
 * NORMAL:	low_noise=1
 * IDLE:	low_noise=0
 */

static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
{
	unsigned int fast_bit = rdev->desc->enable_mask,
		low_noise_bit = fast_bit << 4;
	u8 val;

	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = fast_bit | low_noise_bit;
		break;
	case REGULATOR_MODE_NORMAL:
		val = low_noise_bit;
		break;
	case REGULATOR_MODE_IDLE:
		val = 0;
		break;
	default:
		return -EINVAL;
	}

	return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
				  low_noise_bit | fast_bit, val);
}

static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
{
	unsigned int fast_bit = rdev->desc->enable_mask,
		low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
	unsigned int val;
	int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);

	if (ret < 0)
		return ret;

	if ((val & mask) == mask)
		return REGULATOR_MODE_FAST;

	if ((val & mask) == low_noise_bit)
		return REGULATOR_MODE_NORMAL;

	if (!(val & mask))
		return REGULATOR_MODE_IDLE;

	return -EINVAL;
}

static struct regulator_ops as3711_sd_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear_range,
	.map_voltage		= regulator_map_voltage_linear_range,
	.get_mode		= as3711_get_mode_sd,
	.set_mode		= as3711_set_mode_sd,
};

static struct regulator_ops as3711_aldo_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear_range,
	.map_voltage		= regulator_map_voltage_linear_range,
};

static struct regulator_ops as3711_dldo_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear_range,
	.map_voltage		= regulator_map_voltage_linear_range,
};

static const struct regulator_linear_range as3711_sd_ranges[] = {
	{ .min_uV = 612500, .max_uV = 1400000,
	  .min_sel = 0x1, .max_sel = 0x40, .uV_step = 12500 },
	{ .min_uV = 1425000, .max_uV = 2600000,
	  .min_sel = 0x41, .max_sel = 0x70, .uV_step = 25000 },
	{ .min_uV = 2650000, .max_uV = 3350000,
	  .min_sel = 0x71, .max_sel = 0x7f, .uV_step = 50000 },
};

static const struct regulator_linear_range as3711_aldo_ranges[] = {
	{ .min_uV = 1200000, .max_uV = 1950000,
	  .min_sel = 0, .max_sel = 0xf, .uV_step = 50000 },
	{ .min_uV = 1800000, .max_uV = 3300000,
	  .min_sel = 0x10, .max_sel = 0x1f, .uV_step = 100000 },
};

static const struct regulator_linear_range as3711_dldo_ranges[] = {
	{ .min_uV = 900000, .max_uV = 1700000,
	  .min_sel = 0, .max_sel = 0x10, .uV_step = 50000 },
	{ .min_uV = 1750000, .max_uV = 3300000,
	  .min_sel = 0x20, .max_sel = 0x3f, .uV_step = 50000 },
};

#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx)	\
	[AS3711_REGULATOR_ ## _id] = {							\
	.desc = {									\
		.name = "as3711-regulator-" # _id,					\
		.id = AS3711_REGULATOR_ ## _id,						\
		.n_voltages = (_vmask + 1),						\
		.ops = &as3711_ ## _sfx ## _ops,					\
		.type = REGULATOR_VOLTAGE,						\
		.owner = THIS_MODULE,							\
		.vsel_reg = AS3711_ ## _id ## _VOLTAGE,					\
		.vsel_mask = _vmask << _vshift,						\
		.enable_reg = AS3711_ ## _en_reg,					\
		.enable_mask = BIT(_en_bit),						\
		.min_uV	= _min_uV,							\
		.linear_ranges = as3711_ ## _sfx ## _ranges,				\
		.n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges),		\
	},										\
	.max_uV = _max_uV,								\
}

static struct as3711_regulator_info as3711_reg_info[] = {
	AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
	AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
	AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
	AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
	AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
	AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
	AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	/* StepUp output voltage depends on supplying regulator */
};

#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)

static struct of_regulator_match
as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
	[AS3711_REGULATOR_SD_1] = { .name = "sd1" },
	[AS3711_REGULATOR_SD_2] = { .name = "sd2" },
	[AS3711_REGULATOR_SD_3] = { .name = "sd3" },
	[AS3711_REGULATOR_SD_4] = { .name = "sd4" },
	[AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
	[AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
	[AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
	[AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
	[AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
	[AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
	[AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
	[AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
};

static int as3711_regulator_parse_dt(struct device *dev,
				struct device_node **of_node, const int count)
{
	struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
	struct device_node *regulators =
		of_find_node_by_name(dev->parent->of_node, "regulators");
	struct of_regulator_match *match;
	int ret, i;

	if (!regulators) {
		dev_err(dev, "regulator node not found\n");
		return -ENODEV;
	}

	ret = of_regulator_match(dev->parent, regulators,
				 as3711_regulator_matches, count);
	of_node_put(regulators);
	if (ret < 0) {
		dev_err(dev, "Error parsing regulator init data: %d\n", ret);
		return ret;
	}

	for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
		if (match->of_node) {
			pdata->init_data[i] = match->init_data;
			of_node[i] = match->of_node;
		}

	return 0;
}

static int as3711_regulator_probe(struct platform_device *pdev)
{
	struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
	struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
	struct regulator_init_data *reg_data;
	struct regulator_config config = {.dev = &pdev->dev,};
	struct as3711_regulator *reg = NULL;
	struct as3711_regulator *regs;
	struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
	struct regulator_dev *rdev;
	struct as3711_regulator_info *ri;
	int ret;
	int id;

	if (!pdata) {
		dev_err(&pdev->dev, "No platform data...\n");
		return -ENODEV;
	}

	if (pdev->dev.parent->of_node) {
		ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
		if (ret < 0) {
			dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
			return ret;
		}
	}

	regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
			sizeof(struct as3711_regulator), GFP_KERNEL);
	if (!regs) {
		dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
		return -ENOMEM;
	}

	for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
		reg_data = pdata->init_data[id];

		/* No need to register if there is no regulator data */
		if (!reg_data)
			continue;

		reg = &regs[id];
		reg->reg_info = ri;

		config.init_data = reg_data;
		config.driver_data = reg;
		config.regmap = as3711->regmap;
		config.of_node = of_node[id];

		rdev = regulator_register(&ri->desc, &config);
		if (IS_ERR(rdev)) {
			dev_err(&pdev->dev, "Failed to register regulator %s\n",
				ri->desc.name);
			ret = PTR_ERR(rdev);
			goto eregreg;
		}
		reg->rdev = rdev;
	}
	platform_set_drvdata(pdev, regs);
	return 0;

eregreg:
	while (--id >= 0)
		regulator_unregister(regs[id].rdev);

	return ret;
}

static int as3711_regulator_remove(struct platform_device *pdev)
{
	struct as3711_regulator *regs = platform_get_drvdata(pdev);
	int id;

	for (id = 0; id < AS3711_REGULATOR_NUM; ++id)
		regulator_unregister(regs[id].rdev);
	return 0;
}

static struct platform_driver as3711_regulator_driver = {
	.driver	= {
		.name	= "as3711-regulator",
		.owner	= THIS_MODULE,
	},
	.probe		= as3711_regulator_probe,
	.remove		= as3711_regulator_remove,
};

static int __init as3711_regulator_init(void)
{
	return platform_driver_register(&as3711_regulator_driver);
}
subsys_initcall(as3711_regulator_init);

static void __exit as3711_regulator_exit(void)
{
	platform_driver_unregister(&as3711_regulator_driver);
}
module_exit(as3711_regulator_exit);

MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_DESCRIPTION("AS3711 regulator driver");
MODULE_ALIAS("platform:as3711-regulator");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
f1e64f90 GL	1	/*
	2	* AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
	3	*
	4	* Copyright (C) 2012 Renesas Electronics Corporation
	5	* Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the version 2 of the GNU General Public License as
	9	* published by the Free Software Foundation
	10	*/
	11
	12	#include <linux/err.h>
	13	#include <linux/init.h>
	14	#include <linux/mfd/as3711.h>
	15	#include <linux/module.h>
416d6759	16	#include <linux/of.h>
f1e64f90 GL	17	#include <linux/platform_device.h>
	18	#include <linux/regmap.h>
	19	#include <linux/regulator/driver.h>
416d6759	20	#include <linux/regulator/of_regulator.h>
f1e64f90 GL	21	#include <linux/slab.h>
	22
	23	struct as3711_regulator_info {
	24	struct regulator_desc desc;
	25	unsigned int max_uV;
	26	};
	27
	28	struct as3711_regulator {
	29	struct as3711_regulator_info *reg_info;
	30	struct regulator_dev *rdev;
	31	};
	32
f1e64f90 GL	33	/*
	34	* The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
	35	* STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
	36	* FAST: sdX_fast=1
	37	* NORMAL: low_noise=1
	38	* IDLE: low_noise=0
	39	*/
	40
	41	static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
	42	{
	43	unsigned int fast_bit = rdev->desc->enable_mask,
	44	low_noise_bit = fast_bit << 4;
	45	u8 val;
	46
	47	switch (mode) {
	48	case REGULATOR_MODE_FAST:
	49	val = fast_bit \| low_noise_bit;
	50	break;
	51	case REGULATOR_MODE_NORMAL:
	52	val = low_noise_bit;
	53	break;
	54	case REGULATOR_MODE_IDLE:
	55	val = 0;
	56	break;
	57	default:
	58	return -EINVAL;
	59	}
	60
	61	return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
	62	low_noise_bit \| fast_bit, val);
	63	}
	64
	65	static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
	66	{
	67	unsigned int fast_bit = rdev->desc->enable_mask,
	68	low_noise_bit = fast_bit << 4, mask = fast_bit \| low_noise_bit;
	69	unsigned int val;
	70	int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
	71
	72	if (ret < 0)
	73	return ret;
	74
	75	if ((val & mask) == mask)
	76	return REGULATOR_MODE_FAST;
	77
	78	if ((val & mask) == low_noise_bit)
	79	return REGULATOR_MODE_NORMAL;
	80
	81	if (!(val & mask))
	82	return REGULATOR_MODE_IDLE;
	83
	84	return -EINVAL;
	85	}
	86
f1e64f90 GL	87	static struct regulator_ops as3711_sd_ops = {
	88	.is_enabled = regulator_is_enabled_regmap,
	89	.enable = regulator_enable_regmap,
	90	.disable = regulator_disable_regmap,
	91	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	92	.set_voltage_sel = regulator_set_voltage_sel_regmap,
9234c636 AL	93	.list_voltage = regulator_list_voltage_linear_range,
9234c636 AL	94	.map_voltage = regulator_map_voltage_linear_range,
f1e64f90 GL	95	.get_mode = as3711_get_mode_sd,
	96	.set_mode = as3711_set_mode_sd,
	97	};
	98
	99	static struct regulator_ops as3711_aldo_ops = {
	100	.is_enabled = regulator_is_enabled_regmap,
	101	.enable = regulator_enable_regmap,
	102	.disable = regulator_disable_regmap,
	103	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	104	.set_voltage_sel = regulator_set_voltage_sel_regmap,
9234c636 AL	105	.list_voltage = regulator_list_voltage_linear_range,
9234c636 AL	106	.map_voltage = regulator_map_voltage_linear_range,
f1e64f90 GL	107	};
	108
	109	static struct regulator_ops as3711_dldo_ops = {
	110	.is_enabled = regulator_is_enabled_regmap,
	111	.enable = regulator_enable_regmap,
	112	.disable = regulator_disable_regmap,
	113	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	114	.set_voltage_sel = regulator_set_voltage_sel_regmap,
9234c636 AL	115	.list_voltage = regulator_list_voltage_linear_range,
	116	.map_voltage = regulator_map_voltage_linear_range,
	117	};
	118
	119	static const struct regulator_linear_range as3711_sd_ranges[] = {
	120	{ .min_uV = 612500, .max_uV = 1400000,
	121	.min_sel = 0x1, .max_sel = 0x40, .uV_step = 12500 },
	122	{ .min_uV = 1425000, .max_uV = 2600000,
	123	.min_sel = 0x41, .max_sel = 0x70, .uV_step = 25000 },
	124	{ .min_uV = 2650000, .max_uV = 3350000,
	125	.min_sel = 0x71, .max_sel = 0x7f, .uV_step = 50000 },
	126	};
	127
	128	static const struct regulator_linear_range as3711_aldo_ranges[] = {
	129	{ .min_uV = 1200000, .max_uV = 1950000,
	130	.min_sel = 0, .max_sel = 0xf, .uV_step = 50000 },
	131	{ .min_uV = 1800000, .max_uV = 3300000,
	132	.min_sel = 0x10, .max_sel = 0x1f, .uV_step = 100000 },
	133	};
	134
	135	static const struct regulator_linear_range as3711_dldo_ranges[] = {
	136	{ .min_uV = 900000, .max_uV = 1700000,
	137	.min_sel = 0, .max_sel = 0x10, .uV_step = 50000 },
	138	{ .min_uV = 1750000, .max_uV = 3300000,
	139	.min_sel = 0x20, .max_sel = 0x3f, .uV_step = 50000 },
f1e64f90 GL	140	};
	141
	142	#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx) \
	143	[AS3711_REGULATOR_ ## _id] = { \
	144	.desc = { \
	145	.name = "as3711-regulator-" # _id, \
	146	.id = AS3711_REGULATOR_ ## _id, \
	147	.n_voltages = (_vmask + 1), \
	148	.ops = &as3711_ ## _sfx ## _ops, \
	149	.type = REGULATOR_VOLTAGE, \
	150	.owner = THIS_MODULE, \
	151	.vsel_reg = AS3711_ ## _id ## _VOLTAGE, \
	152	.vsel_mask = _vmask << _vshift, \
	153	.enable_reg = AS3711_ ## _en_reg, \
	154	.enable_mask = BIT(_en_bit), \
	155	.min_uV = _min_uV, \
9234c636 AL	156	.linear_ranges = as3711_ ## _sfx ## _ranges, \
9234c636 AL	157	.n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
f1e64f90 GL	158	}, \
	159	.max_uV = _max_uV, \
	160	}
	161
	162	static struct as3711_regulator_info as3711_reg_info[] = {
	163	AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
	164	AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
	165	AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
	166	AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
	167	AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
	168	AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
	169	AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	170	AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	171	AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	172	AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	173	AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	174	AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	175	/* StepUp output voltage depends on supplying regulator */
	176	};
	177
	178	#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
	179
d6c7d731 AL	180	static struct of_regulator_match
	181	as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
	182	[AS3711_REGULATOR_SD_1] = { .name = "sd1" },
	183	[AS3711_REGULATOR_SD_2] = { .name = "sd2" },
	184	[AS3711_REGULATOR_SD_3] = { .name = "sd3" },
	185	[AS3711_REGULATOR_SD_4] = { .name = "sd4" },
	186	[AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
	187	[AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
	188	[AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
	189	[AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
	190	[AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
	191	[AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
	192	[AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
	193	[AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
416d6759 GL	194	};
	195
	196	static int as3711_regulator_parse_dt(struct device *dev,
	197	struct device_node **of_node, const int count)
	198	{
	199	struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
	200	struct device_node *regulators =
	201	of_find_node_by_name(dev->parent->of_node, "regulators");
d6c7d731	202	struct of_regulator_match *match;
416d6759 GL	203	int ret, i;
	204
	205	if (!regulators) {
	206	dev_err(dev, "regulator node not found\n");
	207	return -ENODEV;
	208	}
	209
d6c7d731 AL	210	ret = of_regulator_match(dev->parent, regulators,
d6c7d731 AL	211	as3711_regulator_matches, count);
416d6759 GL	212	of_node_put(regulators);
	213	if (ret < 0) {
	214	dev_err(dev, "Error parsing regulator init data: %d\n", ret);
	215	return ret;
	216	}
	217
d6c7d731	218	for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
416d6759 GL	219	if (match->of_node) {
	220	pdata->init_data[i] = match->init_data;
	221	of_node[i] = match->of_node;
	222	}
	223
	224	return 0;
	225	}
	226
f1e64f90 GL	227	static int as3711_regulator_probe(struct platform_device *pdev)
	228	{
	229	struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
	230	struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
	231	struct regulator_init_data *reg_data;
	232	struct regulator_config config = {.dev = &pdev->dev,};
	233	struct as3711_regulator *reg = NULL;
	234	struct as3711_regulator *regs;
416d6759	235	struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
f1e64f90 GL	236	struct regulator_dev *rdev;
	237	struct as3711_regulator_info *ri;
	238	int ret;
	239	int id;
	240
416d6759 GL	241	if (!pdata) {
	242	dev_err(&pdev->dev, "No platform data...\n");
	243	return -ENODEV;
	244	}
	245
	246	if (pdev->dev.parent->of_node) {
	247	ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
	248	if (ret < 0) {
	249	dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
	250	return ret;
	251	}
	252	}
f1e64f90 GL	253
	254	regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
	255	sizeof(struct as3711_regulator), GFP_KERNEL);
	256	if (!regs) {
	257	dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
	258	return -ENOMEM;
	259	}
	260
	261	for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
416d6759	262	reg_data = pdata->init_data[id];
f1e64f90 GL	263
f1e64f90 GL	264	/* No need to register if there is no regulator data */
09ca50d2	265	if (!reg_data)
f1e64f90 GL	266	continue;
	267
	268	reg = &regs[id];
	269	reg->reg_info = ri;
	270
	271	config.init_data = reg_data;
	272	config.driver_data = reg;
	273	config.regmap = as3711->regmap;
416d6759	274	config.of_node = of_node[id];
f1e64f90 GL	275
	276	rdev = regulator_register(&ri->desc, &config);
	277	if (IS_ERR(rdev)) {
	278	dev_err(&pdev->dev, "Failed to register regulator %s\n",
	279	ri->desc.name);
	280	ret = PTR_ERR(rdev);
	281	goto eregreg;
	282	}
	283	reg->rdev = rdev;
	284	}
	285	platform_set_drvdata(pdev, regs);
	286	return 0;
	287
	288	eregreg:
	289	while (--id >= 0)
	290	regulator_unregister(regs[id].rdev);
	291
	292	return ret;
	293	}
	294
	295	static int as3711_regulator_remove(struct platform_device *pdev)
	296	{
	297	struct as3711_regulator *regs = platform_get_drvdata(pdev);
	298	int id;
	299
	300	for (id = 0; id < AS3711_REGULATOR_NUM; ++id)
	301	regulator_unregister(regs[id].rdev);
	302	return 0;
	303	}
	304
	305	static struct platform_driver as3711_regulator_driver = {
	306	.driver = {
	307	.name = "as3711-regulator",
	308	.owner = THIS_MODULE,
	309	},
	310	.probe = as3711_regulator_probe,
	311	.remove = as3711_regulator_remove,
	312	};
	313
	314	static int __init as3711_regulator_init(void)
	315	{
	316	return platform_driver_register(&as3711_regulator_driver);
	317	}
	318	subsys_initcall(as3711_regulator_init);
	319
	320	static void __exit as3711_regulator_exit(void)
	321	{
	322	platform_driver_unregister(&as3711_regulator_driver);
	323	}
	324	module_exit(as3711_regulator_exit);
	325
	326	MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
	327	MODULE_DESCRIPTION("AS3711 regulator driver");
	328	MODULE_ALIAS("platform:as3711-regulator");
	329	MODULE_LICENSE("GPL v2");