drivers/regulator/as3711-regulator.c - kernel/msm-4.9 - Gitiles

 /*
  * 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");
	/*
	* 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");