Quelle  lp87565-regulator.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Regulator driver for LP87565 PMIC
 *
 * Copyright (C) 2017 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/lp87565.h>

enum LP87565_regulator_id {
 /* BUCK's */
 LP87565_BUCK_0,
 LP87565_BUCK_1,
 LP87565_BUCK_2,
 LP87565_BUCK_3,
 LP87565_BUCK_10,
 LP87565_BUCK_23,
 LP87565_BUCK_3210,
};

#define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm,  \
     _er, _em, _ev, _delay, _lr, _cr)  \
 [_id] = {       \
  .desc = {      \
   .name   = _name,  \
   .supply_name  = _of "-in",  \
   .id   = _id,   \
   .of_match  = _of,   \
   .regulators_node = "regulators",  \
   .ops   = &_ops,  \
   .n_voltages  = _n,   \
   .type   = REGULATOR_VOLTAGE, \
   .owner   = THIS_MODULE,  \
   .vsel_reg  = _vr,   \
   .vsel_mask  = _vm,   \
   .enable_reg  = _er,   \
   .enable_mask  = _em,   \
   .enable_val  = _ev,   \
   .ramp_delay  = _delay,  \
   .linear_ranges  = _lr,   \
   .n_linear_ranges = ARRAY_SIZE(_lr), \
   .curr_table = lp87565_buck_uA,   \
   .n_current_limits = ARRAY_SIZE(lp87565_buck_uA),\
   .csel_reg = (_cr),    \
   .csel_mask = LP87565_BUCK_CTRL_2_ILIM,  \
  },       \
  .ctrl2_reg = _cr,     \
 }

struct lp87565_regulator {
 struct regulator_desc desc;
 unsigned int ctrl2_reg;
};

static const struct lp87565_regulator regulators[];

static const struct linear_range buck0_1_2_3_ranges[] = {
 REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000),
 REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
 REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
};

static const unsigned int lp87565_buck_ramp_delay[] = {
 30000, 15000, 10000, 7500, 3800, 1900, 940, 470
};

/* LP87565 BUCK current limit */
static const unsigned int lp87565_buck_uA[] = {
 1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
};

static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
           int ramp_delay)
{
 int id = rdev_get_id(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(rdev->regmap, regulators[id].ctrl2_reg,
     LP87565_BUCK_CTRL_2_SLEW_RATE,
     FIELD_PREP(LP87565_BUCK_CTRL_2_SLEW_RATE, reg));
 if (ret) {
  dev_err(&rdev->dev, "SLEW RATE write failed: %d\n", ret);
  return ret;
 }

 rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];

 /* Conservatively give a 15% margin */
 rdev->constraints->ramp_delay =
    rdev->constraints->ramp_delay * 85 / 100;

 return 0;
}

/* Operations permitted on BUCKs */
static const struct regulator_ops lp87565_buck_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  = lp87565_buck_set_ramp_delay,
 .set_current_limit = regulator_set_current_limit_regmap,
 .get_current_limit = regulator_get_current_limit_regmap,
};

static const struct lp87565_regulator regulators[] = {
 LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
     256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
     LP87565_REG_BUCK0_CTRL_1,
     LP87565_BUCK_CTRL_1_EN |
     LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
     LP87565_BUCK_CTRL_1_EN, 3230,
     buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
 LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
     256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
     LP87565_REG_BUCK1_CTRL_1,
     LP87565_BUCK_CTRL_1_EN |
     LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
     LP87565_BUCK_CTRL_1_EN, 3230,
     buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
 LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
     256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
     LP87565_REG_BUCK2_CTRL_1,
     LP87565_BUCK_CTRL_1_EN |
     LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
     LP87565_BUCK_CTRL_1_EN, 3230,
     buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
 LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
     256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
     LP87565_REG_BUCK3_CTRL_1,
     LP87565_BUCK_CTRL_1_EN |
     LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
     LP87565_BUCK_CTRL_1_EN, 3230,
     buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
 LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
     256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
     LP87565_REG_BUCK0_CTRL_1,
     LP87565_BUCK_CTRL_1_EN |
     LP87565_BUCK_CTRL_1_EN_PIN_CTRL |
     LP87565_BUCK_CTRL_1_FPWM_MP_0_2,
     LP87565_BUCK_CTRL_1_EN |
     LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
     buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
 LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
     256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
     LP87565_REG_BUCK2_CTRL_1,
     LP87565_BUCK_CTRL_1_EN |
     LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
     LP87565_BUCK_CTRL_1_EN, 3230,
     buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
 LP87565_REGULATOR("BUCK3210", LP87565_BUCK_3210, "buck3210",
     lp87565_buck_ops, 256, LP87565_REG_BUCK0_VOUT,
     LP87565_BUCK_VSET, LP87565_REG_BUCK0_CTRL_1,
     LP87565_BUCK_CTRL_1_EN |
     LP87565_BUCK_CTRL_1_EN_PIN_CTRL |
     LP87565_BUCK_CTRL_1_FPWM_MP_0_2,
     LP87565_BUCK_CTRL_1_EN |
     LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
     buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
};

static int lp87565_regulator_probe(struct platform_device *pdev)
{
 struct lp87565 *lp87565 = dev_get_drvdata(pdev->dev.parent);
 struct regulator_config config = { };
 struct regulator_dev *rdev;
 int i, min_idx, max_idx;

 platform_set_drvdata(pdev, lp87565);

 config.dev = &pdev->dev;
 config.dev->of_node = lp87565->dev->of_node;
 config.driver_data = lp87565;
 config.regmap = lp87565->regmap;

 switch (lp87565->dev_type) {
 case LP87565_DEVICE_TYPE_LP87565_Q1:
  min_idx = LP87565_BUCK_10;
  max_idx = LP87565_BUCK_23;
  break;
 case LP87565_DEVICE_TYPE_LP87561_Q1:
  min_idx = LP87565_BUCK_3210;
  max_idx = LP87565_BUCK_3210;
  break;
 default:
  min_idx = LP87565_BUCK_0;
  max_idx = LP87565_BUCK_3;
  break;
 }

 for (i = min_idx; i <= max_idx; i++) {
  rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc,
            &config);
  if (IS_ERR(rdev)) {
   dev_err(lp87565->dev, "failed to register %s regulator\n",
    pdev->name);
   return PTR_ERR(rdev);
  }
 }

 return 0;
}

static const struct platform_device_id lp87565_regulator_id_table[] = {
 { "lp87565-regulator", },
 { "lp87565-q1-regulator", },
 { /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table);

static struct platform_driver lp87565_regulator_driver = {
 .driver = {
  .name = "lp87565-pmic",
  .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 },
 .probe = lp87565_regulator_probe,
 .id_table = lp87565_regulator_id_table,
};
module_platform_driver(lp87565_regulator_driver);

MODULE_AUTHOR("J Keerthy ");
MODULE_DESCRIPTION("LP87565 voltage regulator driver");
MODULE_LICENSE("GPL v2");