/*
* Device driver for regulators in Hi6421 IC
*
* Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
* http://www.hisilicon.com
* Copyright (c) <2013-2014> Linaro Ltd.
* http://www.linaro.org
*
* Author: Guodong Xu <guodong.xu@linaro.org>
*
* 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/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/hi6421-pmic.h>
/*
* struct hi6421_regulator_pdata - Hi6421 regulator data of platform device
* @lock: mutex to serialize regulator enable
*/
struct hi6421_regulator_pdata {
struct mutex lock;
};
/*
* struct hi6421_regulator_info - hi6421 regulator information
* @desc: regulator description
* @mode_mask: ECO mode bitmask of LDOs; for BUCKs, this masks sleep
* @eco_microamp: eco mode load upper limit (in uA), valid for LDOs only
*/
struct hi6421_regulator_info {
struct regulator_desc desc;
u8 mode_mask;
u32 eco_microamp;
};
/* HI6421 regulators */
enum hi6421_regulator_id {
HI6421_LDO0,
HI6421_LDO1,
HI6421_LDO2,
HI6421_LDO3,
HI6421_LDO4,
HI6421_LDO5,
HI6421_LDO6,
HI6421_LDO7,
HI6421_LDO8,
HI6421_LDO9,
HI6421_LDO10,
HI6421_LDO11,
HI6421_LDO12,
HI6421_LDO13,
HI6421_LDO14,
HI6421_LDO15,
HI6421_LDO16,
HI6421_LDO17,
HI6421_LDO18,
HI6421_LDO19,
HI6421_LDO20,
HI6421_LDOAUDIO,
HI6421_BUCK0,
HI6421_BUCK1,
HI6421_BUCK2,
HI6421_BUCK3,
HI6421_BUCK4,
HI6421_BUCK5,
HI6421_NUM_REGULATORS,
};
#define HI6421_REGULATOR_OF_MATCH(_name, id) \
{ \
.name = #_name, \
.driver_data = (void *) HI6421_##id, \
}
static struct of_regulator_match hi6421_regulator_match[] = {
HI6421_REGULATOR_OF_MATCH(hi6421_vout0, LDO0),
HI6421_REGULATOR_OF_MATCH(hi6421_vout1, LDO1),
HI6421_REGULATOR_OF_MATCH(hi6421_vout2, LDO2),
HI6421_REGULATOR_OF_MATCH(hi6421_vout3, LDO3),
HI6421_REGULATOR_OF_MATCH(hi6421_vout4, LDO4),
HI6421_REGULATOR_OF_MATCH(hi6421_vout5, LDO5),
HI6421_REGULATOR_OF_MATCH(hi6421_vout6, LDO6),
HI6421_REGULATOR_OF_MATCH(hi6421_vout7, LDO7),
HI6421_REGULATOR_OF_MATCH(hi6421_vout8, LDO8),
HI6421_REGULATOR_OF_MATCH(hi6421_vout9, LDO9),
HI6421_REGULATOR_OF_MATCH(hi6421_vout10, LDO10),
HI6421_REGULATOR_OF_MATCH(hi6421_vout11, LDO11),
HI6421_REGULATOR_OF_MATCH(hi6421_vout12, LDO12),
HI6421_REGULATOR_OF_MATCH(hi6421_vout13, LDO13),
HI6421_REGULATOR_OF_MATCH(hi6421_vout14, LDO14),
HI6421_REGULATOR_OF_MATCH(hi6421_vout15, LDO15),
HI6421_REGULATOR_OF_MATCH(hi6421_vout16, LDO16),
HI6421_REGULATOR_OF_MATCH(hi6421_vout17, LDO17),
HI6421_REGULATOR_OF_MATCH(hi6421_vout18, LDO18),
HI6421_REGULATOR_OF_MATCH(hi6421_vout19, LDO19),
HI6421_REGULATOR_OF_MATCH(hi6421_vout20, LDO20),
HI6421_REGULATOR_OF_MATCH(hi6421_vout_audio, LDOAUDIO),
HI6421_REGULATOR_OF_MATCH(hi6421_buck0, BUCK0),
HI6421_REGULATOR_OF_MATCH(hi6421_buck1, BUCK1),
HI6421_REGULATOR_OF_MATCH(hi6421_buck2, BUCK2),
HI6421_REGULATOR_OF_MATCH(hi6421_buck3, BUCK3),
HI6421_REGULATOR_OF_MATCH(hi6421_buck4, BUCK4),
HI6421_REGULATOR_OF_MATCH(hi6421_buck5, BUCK5),
};
/* LDO 0, 4~7, 9~14, 16~20 have same voltage table. */
static const unsigned int ldo_0_voltages[] = {
1500000, 1800000, 2400000, 2500000,
2600000, 2700000, 2850000, 3000000,
};
/* LDO 8, 15 have same voltage table. */
static const unsigned int ldo_8_voltages[] = {
1500000, 1800000, 2400000, 2600000,
2700000, 2850000, 3000000, 3300000,
};
/* Ranges are sorted in ascending order. */
static const struct regulator_linear_range ldo_audio_volt_range[] = {
REGULATOR_LINEAR_RANGE(2800000, 0, 3, 50000),
REGULATOR_LINEAR_RANGE(3000000, 4, 7, 100000),
};
static const unsigned int buck_3_voltages[] = {
950000, 1050000, 1100000, 1117000,
1134000, 1150000, 1167000, 1200000,
};
static const unsigned int buck_4_voltages[] = {
1150000, 1200000, 1250000, 1350000,
1700000, 1800000, 1900000, 2000000,
};
static const unsigned int buck_5_voltages[] = {
1150000, 1200000, 1250000, 1350000,
1600000, 1700000, 1800000, 1900000,
};
static const struct regulator_ops hi6421_ldo_ops;
static const struct regulator_ops hi6421_ldo_linear_ops;
static const struct regulator_ops hi6421_ldo_linear_range_ops;
static const struct regulator_ops hi6421_buck012_ops;
static const struct regulator_ops hi6421_buck345_ops;
#define HI6421_LDO_ENABLE_TIME (350)
/*
* _id - LDO id name string
* v_table - voltage table
* vreg - voltage select register
* vmask - voltage select mask
* ereg - enable register
* emask - enable mask
* odelay - off/on delay time in uS
* ecomask - eco mode mask
* ecoamp - eco mode load uppler limit in uA
*/
#define HI6421_LDO(_id, v_table, vreg, vmask, ereg, emask, \
odelay, ecomask, ecoamp) \
[HI6421_##_id] = { \
.desc = { \
.name = #_id, \
.ops = &hi6421_ldo_ops, \
.type = REGULATOR_VOLTAGE, \
.id = HI6421_##_id, \
.owner = THIS_MODULE, \
.n_voltages = ARRAY_SIZE(v_table), \
.volt_table = v_table, \
.vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
.vsel_mask = vmask, \
.enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
.enable_mask = emask, \
.enable_time = HI6421_LDO_ENABLE_TIME, \
.off_on_delay = odelay, \
}, \
.mode_mask = ecomask, \
.eco_microamp = ecoamp, \
}
/* HI6421 LDO1~3 are linear voltage regulators at fixed uV_step
*
* _id - LDO id name string
* _min_uV - minimum voltage supported in uV
* n_volt - number of votages available
* vstep - voltage increase in each linear step in uV
* vreg - voltage select register
* vmask - voltage select mask
* ereg - enable register
* emask - enable mask
* odelay - off/on delay time in uS
* ecomask - eco mode mask
* ecoamp - eco mode load uppler limit in uA
*/
#define HI6421_LDO_LINEAR(_id, _min_uV, n_volt, vstep, vreg, vmask, \
ereg, emask, odelay, ecomask, ecoamp) \
[HI6421_##_id] = { \
.desc = { \
.name = #_id, \
.ops = &hi6421_ldo_linear_ops, \
.type = REGULATOR_VOLTAGE, \
.id = HI6421_##_id, \
.owner = THIS_MODULE, \
.min_uV = _min_uV, \
.n_voltages = n_volt, \
.uV_step = vstep, \
.vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
.vsel_mask = vmask, \
.enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
.enable_mask = emask, \
.enable_time = HI6421_LDO_ENABLE_TIME, \
.off_on_delay = odelay, \
}, \
.mode_mask = ecomask, \
.eco_microamp = ecoamp, \
}
/* HI6421 LDOAUDIO is a linear voltage regulator with two 4-step ranges
*
* _id - LDO id name string
* n_volt - number of votages available
* volt_ranges - array of regulator_linear_range
* vstep - voltage increase in each linear step in uV
* vreg - voltage select register
* vmask - voltage select mask
* ereg - enable register
* emask - enable mask
* odelay - off/on delay time in uS
* ecomask - eco mode mask
* ecoamp - eco mode load uppler limit in uA
*/
#define HI6421_LDO_LINEAR_RANGE(_id, n_volt, volt_ranges, vreg, vmask, \
ereg, emask, odelay, ecomask, ecoamp) \
[HI6421_##_id] = { \
.desc = { \
.name = #_id, \
.ops = &hi6421_ldo_linear_range_ops, \
.type = REGULATOR_VOLTAGE, \
.id = HI6421_##_id, \
.owner = THIS_MODULE, \
.n_voltages = n_volt, \
.linear_ranges = volt_ranges, \
.n_linear_ranges = ARRAY_SIZE(volt_ranges), \
.vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
.vsel_mask = vmask, \
.enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
.enable_mask = emask, \
.enable_time = HI6421_LDO_ENABLE_TIME, \
.off_on_delay = odelay, \
}, \
.mode_mask = ecomask, \
.eco_microamp = ecoamp, \
}
/* HI6421 BUCK0/1/2 are linear voltage regulators at fixed uV_step
*
* _id - BUCK0/1/2 id name string
* vreg - voltage select register
* vmask - voltage select mask
* ereg - enable register
* emask - enable mask
* sleepmask - mask of sleep mode
* etime - enable time
* odelay - off/on delay time in uS
*/
#define HI6421_BUCK012(_id, vreg, vmask, ereg, emask, sleepmask, \
etime, odelay) \
[HI6421_##_id] = { \
.desc = { \
.name = #_id, \
.ops = &hi6421_buck012_ops, \
.type = REGULATOR_VOLTAGE, \
.id = HI6421_##_id, \
.owner = THIS_MODULE, \
.min_uV = 700000, \
.n_voltages = 128, \
.uV_step = 7086, \
.vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
.vsel_mask = vmask, \
.enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
.enable_mask = emask, \
.enable_time = etime, \
.off_on_delay = odelay, \
}, \
.mode_mask = sleepmask, \
}
/* HI6421 BUCK3/4/5 share similar configurations as LDOs, with exception
* that it supports SLEEP mode, so has different .ops.
*
* _id - LDO id name string
* v_table - voltage table
* vreg - voltage select register
* vmask - voltage select mask
* ereg - enable register
* emask - enable mask
* odelay - off/on delay time in uS
* sleepmask - mask of sleep mode
*/
#define HI6421_BUCK345(_id, v_table, vreg, vmask, ereg, emask, \
odelay, sleepmask) \
[HI6421_##_id] = { \
.desc = { \
.name = #_id, \
.ops = &hi6421_buck345_ops, \
.type = REGULATOR_VOLTAGE, \
.id = HI6421_##_id, \
.owner = THIS_MODULE, \
.n_voltages = ARRAY_SIZE(v_table), \
.volt_table = v_table, \
.vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
.vsel_mask = vmask, \
.enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
.enable_mask = emask, \
.enable_time = HI6421_LDO_ENABLE_TIME, \
.off_on_delay = odelay, \
}, \
.mode_mask = sleepmask, \
}
/* HI6421 regulator information */
static struct hi6421_regulator_info
hi6421_regulator_info[HI6421_NUM_REGULATORS] = {
HI6421_LDO(LDO0, ldo_0_voltages, 0x20, 0x07, 0x20, 0x10,
10000, 0x20, 8000),
HI6421_LDO_LINEAR(LDO1, 1700000, 4, 100000, 0x21, 0x03, 0x21, 0x10,
10000, 0x20, 5000),
HI6421_LDO_LINEAR(LDO2, 1050000, 8, 50000, 0x22, 0x07, 0x22, 0x10,
20000, 0x20, 8000),
HI6421_LDO_LINEAR(LDO3, 1050000, 8, 50000, 0x23, 0x07, 0x23, 0x10,
20000, 0x20, 8000),
HI6421_LDO(LDO4, ldo_0_voltages, 0x24, 0x07, 0x24, 0x10,
20000, 0x20, 8000),
HI6421_LDO(LDO5, ldo_0_voltages, 0x25, 0x07, 0x25, 0x10,
20000, 0x20, 8000),
HI6421_LDO(LDO6, ldo_0_voltages, 0x26, 0x07, 0x26, 0x10,
20000, 0x20, 8000),
HI6421_LDO(LDO7, ldo_0_voltages, 0x27, 0x07, 0x27, 0x10,
20000, 0x20, 5000),
HI6421_LDO(LDO8, ldo_8_voltages, 0x28, 0x07, 0x28, 0x10,
20000, 0x20, 8000),
HI6421_LDO(LDO9, ldo_0_voltages, 0x29, 0x07, 0x29, 0x10,
40000, 0x20, 8000),
HI6421_LDO(LDO10, ldo_0_voltages, 0x2a, 0x07, 0x2a, 0x10,
40000, 0x20, 8000),
HI6421_LDO(LDO11, ldo_0_voltages, 0x2b, 0x07, 0x2b, 0x10,
40000, 0x20, 8000),
HI6421_LDO(LDO12, ldo_0_voltages, 0x2c, 0x07, 0x2c, 0x10,
40000, 0x20, 8000),
HI6421_LDO(LDO13, ldo_0_voltages, 0x2d, 0x07, 0x2d, 0x10,
40000, 0x20, 8000),
HI6421_LDO(LDO14, ldo_0_voltages, 0x2e, 0x07, 0x2e, 0x10,
40000, 0x20, 8000),
HI6421_LDO(LDO15, ldo_8_voltages, 0x2f, 0x07, 0x2f, 0x10,
40000, 0x20, 8000),
HI6421_LDO(LDO16, ldo_0_voltages, 0x30, 0x07, 0x30, 0x10,
40000, 0x20, 8000),
HI6421_LDO(LDO17, ldo_0_voltages, 0x31, 0x07, 0x31, 0x10,
40000, 0x20, 8000),
HI6421_LDO(LDO18, ldo_0_voltages, 0x32, 0x07, 0x32, 0x10,
40000, 0x20, 8000),
HI6421_LDO(LDO19, ldo_0_voltages, 0x33, 0x07, 0x33, 0x10,
40000, 0x20, 8000),
HI6421_LDO(LDO20, ldo_0_voltages, 0x34, 0x07, 0x34, 0x10,
40000, 0x20, 8000),
HI6421_LDO_LINEAR_RANGE(LDOAUDIO, 8, ldo_audio_volt_range, 0x36,
0x70, 0x36, 0x01, 40000, 0x02, 5000),
HI6421_BUCK012(BUCK0, 0x0d, 0x7f, 0x0c, 0x01, 0x10, 400, 20000),
HI6421_BUCK012(BUCK1, 0x0f, 0x7f, 0x0e, 0x01, 0x10, 400, 20000),
HI6421_BUCK012(BUCK2, 0x11, 0x7f, 0x10, 0x01, 0x10, 350, 100),
HI6421_BUCK345(BUCK3, buck_3_voltages, 0x13, 0x07, 0x12, 0x01,
20000, 0x10),
HI6421_BUCK345(BUCK4, buck_4_voltages, 0x15, 0x07, 0x14, 0x01,
20000, 0x10),
HI6421_BUCK345(BUCK5, buck_5_voltages, 0x17, 0x07, 0x16, 0x01,
20000, 0x10),
};
static int hi6421_regulator_enable(struct regulator_dev *rdev)
{
struct hi6421_regulator_pdata *pdata;
pdata = dev_get_drvdata(rdev->dev.parent);
/* hi6421 spec requires regulator enablement must be serialized:
* - Because when BUCK, LDO switching from off to on, it will have
* a huge instantaneous current; so you can not turn on two or
* more LDO or BUCKs simultaneously, or it may burn the chip.
*/
mutex_lock(&pdata->lock);
/* call regulator regmap helper */
regulator_enable_regmap(rdev);
mutex_unlock(&pdata->lock);
return 0;
}
static unsigned int hi6421_regulator_ldo_get_mode(struct regulator_dev *rdev)
{
struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
u32 reg_val;
regmap_read(rdev->regmap, rdev->desc->enable_reg, ®_val);
if (reg_val & info->mode_mask)
return REGULATOR_MODE_IDLE;
return REGULATOR_MODE_NORMAL;
}
static unsigned int hi6421_regulator_buck_get_mode(struct regulator_dev *rdev)
{
struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
u32 reg_val;
regmap_read(rdev->regmap, rdev->desc->enable_reg, ®_val);
if (reg_val & info->mode_mask)
return REGULATOR_MODE_STANDBY;
return REGULATOR_MODE_NORMAL;
}
static int hi6421_regulator_ldo_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
u32 new_mode;
switch (mode) {
case REGULATOR_MODE_NORMAL:
new_mode = 0;
break;
case REGULATOR_MODE_IDLE:
new_mode = info->mode_mask;
break;
default:
return -EINVAL;
}
/* set mode */
regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
info->mode_mask, new_mode);
return 0;
}
static int hi6421_regulator_buck_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
u32 new_mode;
switch (mode) {
case REGULATOR_MODE_NORMAL:
new_mode = 0;
break;
case REGULATOR_MODE_STANDBY:
new_mode = info->mode_mask;
break;
default:
return -EINVAL;
}
/* set mode */
regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
info->mode_mask, new_mode);
return 0;
}
unsigned int hi6421_regulator_ldo_get_optimum_mode(struct regulator_dev *rdev,
int input_uV, int output_uV, int load_uA)
{
struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
if (load_uA > info->eco_microamp)
return REGULATOR_MODE_NORMAL;
return REGULATOR_MODE_IDLE;
}
static const struct regulator_ops hi6421_ldo_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = hi6421_regulator_enable,
.disable = regulator_disable_regmap,
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_mode = hi6421_regulator_ldo_get_mode,
.set_mode = hi6421_regulator_ldo_set_mode,
.get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
};
static const struct regulator_ops hi6421_ldo_linear_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = hi6421_regulator_enable,
.disable = regulator_disable_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_mode = hi6421_regulator_ldo_get_mode,
.set_mode = hi6421_regulator_ldo_set_mode,
.get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
};
static const struct regulator_ops hi6421_ldo_linear_range_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = hi6421_regulator_enable,
.disable = regulator_disable_regmap,
.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,
.get_mode = hi6421_regulator_ldo_get_mode,
.set_mode = hi6421_regulator_ldo_set_mode,
.get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
};
static const struct regulator_ops hi6421_buck012_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = hi6421_regulator_enable,
.disable = regulator_disable_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_mode = hi6421_regulator_buck_get_mode,
.set_mode = hi6421_regulator_buck_set_mode,
};
static const struct regulator_ops hi6421_buck345_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = hi6421_regulator_enable,
.disable = regulator_disable_regmap,
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_mode = hi6421_regulator_buck_get_mode,
.set_mode = hi6421_regulator_buck_set_mode,
};
static int hi6421_regulator_register(struct platform_device *pdev,
struct regmap *rmap,
struct regulator_init_data *init_data,
int id, struct device_node *np)
{
struct hi6421_regulator_info *info = NULL;
struct regulator_config config = { };
struct regulator_dev *rdev;
/* assign per-regulator data */
info = &hi6421_regulator_info[id];
config.dev = &pdev->dev;
config.init_data = init_data;
config.driver_data = info;
config.regmap = rmap;
config.of_node = np;
/* register regulator with framework */
rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "failed to register regulator %s\n",
info->desc.name);
return PTR_ERR(rdev);
}
return 0;
}
static int hi6421_regulator_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np;
struct hi6421_pmic *pmic;
struct hi6421_regulator_pdata *pdata;
int i, ret = 0;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
mutex_init(&pdata->lock);
platform_set_drvdata(pdev, pdata);
np = of_get_child_by_name(dev->parent->of_node, "regulators");
if (!np)
return -ENODEV;
ret = of_regulator_match(dev, np,
hi6421_regulator_match,
ARRAY_SIZE(hi6421_regulator_match));
of_node_put(np);
if (ret < 0) {
dev_err(dev, "Error parsing regulator init data: %d\n", ret);
return ret;
}
pmic = dev_get_drvdata(dev->parent);
for (i = 0; i < ARRAY_SIZE(hi6421_regulator_info); i++) {
ret = hi6421_regulator_register(pdev, pmic->regmap,
hi6421_regulator_match[i].init_data, i,
hi6421_regulator_match[i].of_node);
if (ret)
return ret;
}
return 0;
}
static struct platform_driver hi6421_regulator_driver = {
.driver = {
.name = "hi6421-regulator",
},
.probe = hi6421_regulator_probe,
};
module_platform_driver(hi6421_regulator_driver);
MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
MODULE_DESCRIPTION("Hi6421 regulator driver");
MODULE_LICENSE("GPL v2");
