Quelle  lp873x-regulator.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Regulator driver for LP873X PMIC
 *
 * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/
 */

#include <linux/bitfield.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#include <linux/mfd/lp873x.h>

#define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
    _delay, _lr, _cr)    \
 [_id] = {       \
  .desc = {      \
   .name   = _name,  \
   .supply_name  = _of "-in",  \
   .id   = _id,   \
   .of_match  = of_match_ptr(_of), \
   .regulators_node = of_match_ptr("regulators"),\
   .ops   = &_ops,  \
   .n_voltages  = _n,   \
   .type   = REGULATOR_VOLTAGE, \
   .owner   = THIS_MODULE,  \
   .vsel_reg  = _vr,   \
   .vsel_mask  = _vm,   \
   .enable_reg  = _er,   \
   .enable_mask  = _em,   \
   .ramp_delay  = _delay,  \
   .linear_ranges  = _lr,   \
   .n_linear_ranges = ARRAY_SIZE(_lr), \
   .curr_table = lp873x_buck_uA,  \
   .n_current_limits = ARRAY_SIZE(lp873x_buck_uA), \
   .csel_reg = (_cr),   \
   .csel_mask = LP873X_BUCK0_CTRL_2_BUCK0_ILIM,\
  },       \
  .ctrl2_reg = _cr,     \
 }

struct lp873x_regulator {
 struct regulator_desc desc;
 unsigned int ctrl2_reg;
};

static const struct lp873x_regulator regulators[];

static const struct linear_range buck0_buck1_ranges[] = {
 REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
 REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
 REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
 REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
};

static const struct linear_range ldo0_ldo1_ranges[] = {
 REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
};

static const unsigned int lp873x_buck_ramp_delay[] = {
 30000, 15000, 10000, 7500, 3800, 1900, 940, 470
};

/* LP873X BUCK current limit */
static const unsigned int lp873x_buck_uA[] = {
 1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
};

static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
          int ramp_delay)
{
 int id = rdev_get_id(rdev);
 struct lp873x *lp873 = rdev_get_drvdata(rdev);
 unsigned int reg;
 int ret;

 if (ramp_delay <= 470)
  reg = 7;
 else if (ramp_delay <= 940)
  reg = 6;
 else if (ramp_delay <= 1900)
  reg = 5;
 else if (ramp_delay <= 3800)
  reg = 4;
 else if (ramp_delay <= 7500)
  reg = 3;
 else if (ramp_delay <= 10000)
  reg = 2;
 else if (ramp_delay <= 15000)
  reg = 1;
 else
  reg = 0;

 ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
     LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
     FIELD_PREP(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE, reg));
 if (ret) {
  dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
  return ret;
 }

 rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];

 return 0;
}

/* Operations permitted on BUCK0, BUCK1 */
static const struct regulator_ops lp873x_buck01_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,
 .set_voltage_time_sel = regulator_set_voltage_time_sel,
 .set_ramp_delay  = lp873x_buck_set_ramp_delay,
 .set_current_limit = regulator_set_current_limit_regmap,
 .get_current_limit = regulator_get_current_limit_regmap,
};

/* Operations permitted on LDO0 and LDO1 */
static const struct regulator_ops lp873x_ldo01_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 lp873x_regulator regulators[] = {
 LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
    256, LP873X_REG_BUCK0_VOUT,
    LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
    LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
    buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
 LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
    256, LP873X_REG_BUCK1_VOUT,
    LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
    LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
    buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
 LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
    LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
    LP873X_REG_LDO0_CTRL,
    LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
 LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
    LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
    LP873X_REG_LDO1_CTRL,
    LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
};

static int lp873x_regulator_probe(struct platform_device *pdev)
{
 struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
 struct regulator_config config = { };
 struct regulator_dev *rdev;
 int i;

 platform_set_drvdata(pdev, lp873);

 config.dev = &pdev->dev;
 config.dev->of_node = lp873->dev->of_node;
 config.driver_data = lp873;
 config.regmap = lp873->regmap;

 for (i = 0; i < ARRAY_SIZE(regulators); i++) {
  rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc,
            &config);
  if (IS_ERR(rdev)) {
   dev_err(lp873->dev, "failed to register %s regulator\n",
    pdev->name);
   return PTR_ERR(rdev);
  }
 }

 return 0;
}

static const struct platform_device_id lp873x_regulator_id_table[] = {
 { "lp873x-regulator", },
 { /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);

static struct platform_driver lp873x_regulator_driver = {
 .driver = {
  .name = "lp873x-pmic",
  .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 },
 .probe = lp873x_regulator_probe,
 .id_table = lp873x_regulator_id_table,
};
module_platform_driver(lp873x_regulator_driver);

MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
MODULE_DESCRIPTION("LP873X voltage regulator driver");
MODULE_ALIAS("platform:lp873x-pmic");
MODULE_LICENSE("GPL v2");