Quelle  hi6421v530-regulator.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
//
// Device driver for regulators in Hi6421V530 IC
//
// Copyright (c) <2017> HiSilicon Technologies Co., Ltd.
//              http://www.hisilicon.com
// Copyright (c) <2017> Linaro Ltd.
//              https://www.linaro.org
//
// Author: Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>
//         Guodong Xu <guodong.xu@linaro.org>

#include <linux/mfd/hi6421-pmic.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>

/*
 * struct hi6421v530_regulator_info - hi6421v530 regulator information
 * @desc: regulator description
 * @mode_mask: ECO mode bitmask of LDOs; for BUCKs, this masks sleep
 */
struct hi6421v530_regulator_info {
 struct regulator_desc rdesc;
 u8 mode_mask;
};

/* HI6421v530 regulators */
enum hi6421v530_regulator_id {
 HI6421V530_LDO3,
 HI6421V530_LDO9,
 HI6421V530_LDO11,
 HI6421V530_LDO15,
 HI6421V530_LDO16,
};

static const unsigned int ldo_3_voltages[] = {
 1800000, 1825000, 1850000, 1875000,
 1900000, 1925000, 1950000, 1975000,
 2000000, 2025000, 2050000, 2075000,
 2100000, 2125000, 2150000, 2200000,
};

static const unsigned int ldo_9_11_voltages[] = {
 1750000, 1800000, 1825000, 2800000,
 2850000, 2950000, 3000000, 3300000,
};

static const unsigned int ldo_15_16_voltages[] = {
 1750000, 1800000, 2400000, 2600000,
 2700000, 2850000, 2950000, 3000000,
};

static const struct regulator_ops hi6421v530_ldo_ops;

#define HI6421V530_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
 */
#define HI6421V530_LDO(_ID, v_table, vreg, vmask, ereg, emask,  \
     odelay, ecomask) {     \
 .rdesc = {       \
  .name   = #_ID,    \
  .of_match        = of_match_ptr(#_ID),   \
  .regulators_node = of_match_ptr("regulators"),  \
  .ops   = &hi6421v530_ldo_ops,   \
  .type   = REGULATOR_VOLTAGE,   \
  .id   = HI6421V530_##_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  = HI6421V530_LDO_ENABLE_TIME,  \
  .off_on_delay  = odelay,    \
 },        \
 .mode_mask = ecomask,     \
}

/* HI6421V530 regulator information */

static const struct hi6421v530_regulator_info hi6421v530_regulator_info[] = {
 HI6421V530_LDO(LDO3, ldo_3_voltages, 0x061, 0xf, 0x060, 0x2,
     20000, 0x6),
 HI6421V530_LDO(LDO9, ldo_9_11_voltages, 0x06b, 0x7, 0x06a, 0x2,
     40000, 0x6),
 HI6421V530_LDO(LDO11, ldo_9_11_voltages, 0x06f, 0x7, 0x06e, 0x2,
     40000, 0x6),
 HI6421V530_LDO(LDO15, ldo_15_16_voltages, 0x077, 0x7, 0x076, 0x2,
     40000, 0x6),
 HI6421V530_LDO(LDO16, ldo_15_16_voltages, 0x079, 0x7, 0x078, 0x2,
     40000, 0x6),
};

static unsigned int hi6421v530_regulator_ldo_get_mode(
     struct regulator_dev *rdev)
{
 const struct hi6421v530_regulator_info *info;
 unsigned int reg_val;

 info = container_of(rdev->desc, struct hi6421v530_regulator_info, rdesc);
 regmap_read(rdev->regmap, rdev->desc->enable_reg, ®_val);

 if (reg_val & (info->mode_mask))
  return REGULATOR_MODE_IDLE;

 return REGULATOR_MODE_NORMAL;
}

static int hi6421v530_regulator_ldo_set_mode(struct regulator_dev *rdev,
      unsigned int mode)
{
 const struct hi6421v530_regulator_info *info;
 unsigned int new_mode;

 info = container_of(rdev->desc, struct hi6421v530_regulator_info, rdesc);
 switch (mode) {
 case REGULATOR_MODE_NORMAL:
  new_mode = 0;
  break;
 case REGULATOR_MODE_IDLE:
  new_mode = info->mode_mask;
  break;
 default:
  return -EINVAL;
 }

 regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
      info->mode_mask, new_mode);

 return 0;
}


static const struct regulator_ops hi6421v530_ldo_ops = {
 .is_enabled = regulator_is_enabled_regmap,
 .enable = regulator_enable_regmap,
 .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 = hi6421v530_regulator_ldo_get_mode,
 .set_mode = hi6421v530_regulator_ldo_set_mode,
};

static int hi6421v530_regulator_probe(struct platform_device *pdev)
{
 struct hi6421_pmic *pmic;
 struct regulator_dev *rdev;
 struct regulator_config config = { };
 unsigned int i;

 pmic = dev_get_drvdata(pdev->dev.parent);
 if (!pmic) {
  dev_err(&pdev->dev, "no pmic in the regulator parent node\n");
  return -ENODEV;
 }

 for (i = 0; i < ARRAY_SIZE(hi6421v530_regulator_info); i++) {
  config.dev = pdev->dev.parent;
  config.regmap = pmic->regmap;

  rdev = devm_regulator_register(&pdev->dev,
    &hi6421v530_regulator_info[i].rdesc,
    &config);
  if (IS_ERR(rdev)) {
   dev_err(&pdev->dev, "failed to register regulator %s\n",
    hi6421v530_regulator_info[i].rdesc.name);
   return PTR_ERR(rdev);
  }
 }
 return 0;
}

static const struct platform_device_id hi6421v530_regulator_table[] = {
 { .name = "hi6421v530-regulator" },
 {},
};
MODULE_DEVICE_TABLE(platform, hi6421v530_regulator_table);

static struct platform_driver hi6421v530_regulator_driver = {
 .id_table = hi6421v530_regulator_table,
 .driver = {
  .name = "hi6421v530-regulator",
  .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 },
 .probe = hi6421v530_regulator_probe,
};
module_platform_driver(hi6421v530_regulator_driver);

MODULE_AUTHOR("Wang Xiaoyin ");
MODULE_DESCRIPTION("Hi6421v530 regulator driver");
MODULE_LICENSE("GPL v2");