drivers/regulator/lp873x-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Regulator driver for LP873X PMIC
   4  *
   5  * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/
   6  */
   7
   8 #include <linux/bitfield.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/regmap.h>
  12
  13 #include <linux/mfd/lp873x.h>
  14
  15 #define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
  16                          _delay, _lr, _cr)                              \
  17         [_id] = {                                                       \
  18                 .desc = {                                               \
  19                         .name                   = _name,                \
  20                         .supply_name            = _of "-in",            \
  21                         .id                     = _id,                  \
  22                         .of_match               = of_match_ptr(_of),    \
  23                         .regulators_node        = of_match_ptr("regulators"),\
  24                         .ops                    = &_ops,                \
  25                         .n_voltages             = _n,                   \
  26                         .type                   = REGULATOR_VOLTAGE,    \
  27                         .owner                  = THIS_MODULE,          \
  28                         .vsel_reg               = _vr,                  \
  29                         .vsel_mask              = _vm,                  \
  30                         .enable_reg             = _er,                  \
  31                         .enable_mask            = _em,                  \
  32                         .ramp_delay             = _delay,               \
  33                         .linear_ranges          = _lr,                  \
  34                         .n_linear_ranges        = ARRAY_SIZE(_lr),      \
  35                         .curr_table     = lp873x_buck_uA,               \
  36                         .n_current_limits = ARRAY_SIZE(lp873x_buck_uA), \
  37                         .csel_reg       = (_cr),                        \
  38                         .csel_mask      = LP873X_BUCK0_CTRL_2_BUCK0_ILIM,\
  39                 },                                                      \
  40                 .ctrl2_reg = _cr,                                       \
  41         }
  42
  43 struct lp873x_regulator {
  44         struct regulator_desc desc;
  45         unsigned int ctrl2_reg;
  46 };
  47
  48 static const struct lp873x_regulator regulators[];
  49
  50 static const struct linear_range buck0_buck1_ranges[] = {
  51         REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
  52         REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
  53         REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
  54         REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
  55 };
  56
  57 static const struct linear_range ldo0_ldo1_ranges[] = {
  58         REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
  59 };
  60
  61 static const unsigned int lp873x_buck_ramp_delay[] = {
  62         30000, 15000, 10000, 7500, 3800, 1900, 940, 470
  63 };
  64
  65 /* LP873X BUCK current limit */
  66 static const unsigned int lp873x_buck_uA[] = {
  67         1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
  68 };
  69
  70 static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
  71                                       int ramp_delay)
  72 {
  73         int id = rdev_get_id(rdev);
  74         struct lp873x *lp873 = rdev_get_drvdata(rdev);
  75         unsigned int reg;
  76         int ret;
  77
  78         if (ramp_delay <= 470)
  79                 reg = 7;
  80         else if (ramp_delay <= 940)
  81                 reg = 6;
  82         else if (ramp_delay <= 1900)
  83                 reg = 5;
  84         else if (ramp_delay <= 3800)
  85                 reg = 4;
  86         else if (ramp_delay <= 7500)
  87                 reg = 3;
  88         else if (ramp_delay <= 10000)
  89                 reg = 2;
  90         else if (ramp_delay <= 15000)
  91                 reg = 1;
  92         else
  93                 reg = 0;
  94
  95         ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
  96                                  LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
  97                                  FIELD_PREP(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE, reg));
  98         if (ret) {
  99                 dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
 100                 return ret;
 101         }
 102
 103         rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];
 104
 105         return 0;
 106 }
 107
 108 /* Operations permitted on BUCK0, BUCK1 */
 109 static const struct regulator_ops lp873x_buck01_ops = {
 110         .is_enabled             = regulator_is_enabled_regmap,
 111         .enable                 = regulator_enable_regmap,
 112         .disable                = regulator_disable_regmap,
 113         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 114         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 115         .list_voltage           = regulator_list_voltage_linear_range,
 116         .map_voltage            = regulator_map_voltage_linear_range,
 117         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 118         .set_ramp_delay         = lp873x_buck_set_ramp_delay,
 119         .set_current_limit      = regulator_set_current_limit_regmap,
 120         .get_current_limit      = regulator_get_current_limit_regmap,
 121 };
 122
 123 /* Operations permitted on LDO0 and LDO1 */
 124 static const struct regulator_ops lp873x_ldo01_ops = {
 125         .is_enabled             = regulator_is_enabled_regmap,
 126         .enable                 = regulator_enable_regmap,
 127         .disable                = regulator_disable_regmap,
 128         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 129         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 130         .list_voltage           = regulator_list_voltage_linear_range,
 131         .map_voltage            = regulator_map_voltage_linear_range,
 132 };
 133
 134 static const struct lp873x_regulator regulators[] = {
 135         LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
 136                          256, LP873X_REG_BUCK0_VOUT,
 137                          LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
 138                          LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
 139                          buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
 140         LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
 141                          256, LP873X_REG_BUCK1_VOUT,
 142                          LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
 143                          LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
 144                          buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
 145         LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
 146                          LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
 147                          LP873X_REG_LDO0_CTRL,
 148                          LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
 149         LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
 150                          LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
 151                          LP873X_REG_LDO1_CTRL,
 152                          LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
 153 };
 154
 155 static int lp873x_regulator_probe(struct platform_device *pdev)
 156 {
 157         struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
 158         struct regulator_config config = { };
 159         struct regulator_dev *rdev;
 160         int i;
 161
 162         platform_set_drvdata(pdev, lp873);
 163
 164         config.dev = &pdev->dev;
 165         config.dev->of_node = lp873->dev->of_node;
 166         config.driver_data = lp873;
 167         config.regmap = lp873->regmap;
 168
 169         for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 170                 rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
 171                                                &config);
 172                 if (IS_ERR(rdev)) {
 173                         dev_err(lp873->dev, "failed to register %s regulator\n",
 174                                 pdev->name);
 175                         return PTR_ERR(rdev);
 176                 }
 177         }
 178
 179         return 0;
 180 }
 181
 182 static const struct platform_device_id lp873x_regulator_id_table[] = {
 183         { "lp873x-regulator", },
 184         { /* sentinel */ }
 185 };
 186 MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);
 187
 188 static struct platform_driver lp873x_regulator_driver = {
 189         .driver = {
 190                 .name = "lp873x-pmic",
 191                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 192         },
 193         .probe = lp873x_regulator_probe,
 194         .id_table = lp873x_regulator_id_table,
 195 };
 196 module_platform_driver(lp873x_regulator_driver);
 197
 198 MODULE_AUTHOR("J Keerthy <[email protected]>");
 199 MODULE_DESCRIPTION("LP873X voltage regulator driver");
 200 MODULE_ALIAS("platform:lp873x-pmic");
 201 MODULE_LICENSE("GPL v2");