// SPDX-License-Identifier: GPL-2.0
//
// 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.
//              https://www.linaro.org
//
// Author: Guodong Xu <guodong.xu@linaro.org>

#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,
};

/* 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 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
 * _match - of match 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, _match, v_table, vreg, vmask, ereg, emask,      \
                   odelay, ecomask, ecoamp)                             \
        [HI6421_##_id] = {                                              \
                .desc = {                                               \
                        .name           = #_id,                         \
                        .of_match        = #_match,                     \
                        .regulators_node = "regulators",                \
                        .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
 * _match - of match 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, _match, _min_uV, n_volt, vstep, vreg, vmask,\
                          ereg, emask, odelay, ecomask, ecoamp)         \
        [HI6421_##_id] = {                                              \
                .desc = {                                               \
                        .name           = #_id,                         \
                        .of_match        = #_match,                     \
                        .regulators_node = "regulators",                \
                        .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
 * _match - of match name string
 * n_volt - number of votages available
 * volt_ranges - array of 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, _match, n_volt, volt_ranges, vreg, vmask,\
                                ereg, emask, odelay, ecomask, ecoamp)   \
        [HI6421_##_id] = {                                              \
                .desc = {                                               \
                        .name           = #_id,                         \
                        .of_match        = #_match,                     \
                        .regulators_node = "regulators",                \
                        .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
 * _match - of match 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, _match, vreg, vmask, ereg, emask, sleepmask,\
                        etime, odelay)                                  \
        [HI6421_##_id] = {                                              \
                .desc = {                                               \
                        .name           = #_id,                         \
                        .of_match        = #_match,                     \
                        .regulators_node = "regulators",                \
                        .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
 * _match - of match 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, _match, v_table, vreg, vmask, ereg, emask,  \
                        odelay, sleepmask)                              \
        [HI6421_##_id] = {                                              \
                .desc = {                                               \
                        .name           = #_id,                         \
                        .of_match        = #_match,                     \
                        .regulators_node = "regulators",                \
                        .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 const struct hi6421_regulator_info
                hi6421_regulator_info[HI6421_NUM_REGULATORS] = {
        HI6421_LDO(LDO0, hi6421_vout0, ldo_0_voltages, 0x20, 0x07, 0x20, 0x10,
                   10000, 0x20, 8000),
        HI6421_LDO_LINEAR(LDO1, hi6421_vout1, 1700000, 4, 100000, 0x21, 0x03,
                          0x21, 0x10, 10000, 0x20, 5000),
        HI6421_LDO_LINEAR(LDO2, hi6421_vout2, 1050000, 8, 50000, 0x22, 0x07,
                          0x22, 0x10, 20000, 0x20, 8000),
        HI6421_LDO_LINEAR(LDO3, hi6421_vout3, 1050000, 8, 50000, 0x23, 0x07,
                          0x23, 0x10, 20000, 0x20, 8000),
        HI6421_LDO(LDO4, hi6421_vout4, ldo_0_voltages, 0x24, 0x07, 0x24, 0x10,
                   20000, 0x20, 8000),
        HI6421_LDO(LDO5, hi6421_vout5, ldo_0_voltages, 0x25, 0x07, 0x25, 0x10,
                   20000, 0x20, 8000),
        HI6421_LDO(LDO6, hi6421_vout6, ldo_0_voltages, 0x26, 0x07, 0x26, 0x10,
                   20000, 0x20, 8000),
        HI6421_LDO(LDO7, hi6421_vout7, ldo_0_voltages, 0x27, 0x07, 0x27, 0x10,
                   20000, 0x20, 5000),
        HI6421_LDO(LDO8, hi6421_vout8, ldo_8_voltages, 0x28, 0x07, 0x28, 0x10,
                   20000, 0x20, 8000),
        HI6421_LDO(LDO9, hi6421_vout9, ldo_0_voltages, 0x29, 0x07, 0x29, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO(LDO10, hi6421_vout10, ldo_0_voltages, 0x2a, 0x07, 0x2a, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO(LDO11, hi6421_vout11, ldo_0_voltages, 0x2b, 0x07, 0x2b, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO(LDO12, hi6421_vout12, ldo_0_voltages, 0x2c, 0x07, 0x2c, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO(LDO13, hi6421_vout13, ldo_0_voltages, 0x2d, 0x07, 0x2d, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO(LDO14, hi6421_vout14, ldo_0_voltages, 0x2e, 0x07, 0x2e, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO(LDO15, hi6421_vout15, ldo_8_voltages, 0x2f, 0x07, 0x2f, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO(LDO16, hi6421_vout16, ldo_0_voltages, 0x30, 0x07, 0x30, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO(LDO17, hi6421_vout17, ldo_0_voltages, 0x31, 0x07, 0x31, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO(LDO18, hi6421_vout18, ldo_0_voltages, 0x32, 0x07, 0x32, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO(LDO19, hi6421_vout19, ldo_0_voltages, 0x33, 0x07, 0x33, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO(LDO20, hi6421_vout20, ldo_0_voltages, 0x34, 0x07, 0x34, 0x10,
                   40000, 0x20, 8000),
        HI6421_LDO_LINEAR_RANGE(LDOAUDIO, hi6421_vout_audio, 8,
                                ldo_audio_volt_range, 0x36, 0x70, 0x36, 0x01,
                                40000, 0x02, 5000),
        HI6421_BUCK012(BUCK0, hi6421_buck0, 0x0d, 0x7f, 0x0c, 0x01, 0x10, 400,
                       20000),
        HI6421_BUCK012(BUCK1, hi6421_buck1, 0x0f, 0x7f, 0x0e, 0x01, 0x10, 400,
                       20000),
        HI6421_BUCK012(BUCK2, hi6421_buck2, 0x11, 0x7f, 0x10, 0x01, 0x10, 350,
                       100),
        HI6421_BUCK345(BUCK3, hi6421_buck3, buck_3_voltages, 0x13, 0x07, 0x12,
                       0x01, 20000, 0x10),
        HI6421_BUCK345(BUCK4, hi6421_buck4, buck_4_voltages, 0x15, 0x07, 0x14,
                       0x01, 20000, 0x10),
        HI6421_BUCK345(BUCK5, hi6421_buck5, buck_5_voltages, 0x17, 0x07, 0x16,
                       0x01, 20000, 0x10),
};

static int hi6421_regulator_enable(struct regulator_dev *rdev)
{
        struct hi6421_regulator_pdata *pdata = rdev_get_drvdata(rdev);

        /* 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)
{
        const struct hi6421_regulator_info *info;
        unsigned int reg_val;

        info = container_of_const(rdev->desc, struct hi6421_regulator_info, desc);
        regmap_read(rdev->regmap, rdev->desc->enable_reg, &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)
{
        const struct hi6421_regulator_info *info;
        unsigned int reg_val;

        info = container_of_const(rdev->desc, struct hi6421_regulator_info, desc);
        regmap_read(rdev->regmap, rdev->desc->enable_reg, &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)
{
        const struct hi6421_regulator_info *info;
        unsigned int new_mode;

        info = container_of_const(rdev->desc, struct hi6421_regulator_info, desc);
        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)
{
        const struct hi6421_regulator_info *info;
        unsigned int new_mode;

        info = container_of_const(rdev->desc, struct hi6421_regulator_info, desc);
        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;
}

static unsigned int
hi6421_regulator_ldo_get_optimum_mode(struct regulator_dev *rdev,
                        int input_uV, int output_uV, int load_uA)
{
        const struct hi6421_regulator_info *info;

        info = container_of_const(rdev->desc, struct hi6421_regulator_info, desc);

        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_probe(struct platform_device *pdev)
{
        struct hi6421_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
        struct hi6421_regulator_pdata *pdata;
        const struct hi6421_regulator_info *info;
        struct regulator_config config = { };
        struct regulator_dev *rdev;
        int i;

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

        for (i = 0; i < ARRAY_SIZE(hi6421_regulator_info); i++) {
                /* assign per-regulator data */
                info = &hi6421_regulator_info[i];

                config.dev = pdev->dev.parent;
                config.driver_data = pdata;
                config.regmap = pmic->regmap;

                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 const struct platform_device_id hi6421_regulator_table[] = {
        { .name = "hi6421-regulator" },
        {},
};
MODULE_DEVICE_TABLE(platform, hi6421_regulator_table);

static struct platform_driver hi6421_regulator_driver = {
        .id_table = hi6421_regulator_table,
        .driver = {
                .name   = "hi6421-regulator",
                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
        },
        .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");