drivers/regulator/lp873x-regulator.c

   1 /*
   2  * Regulator driver for LP873X PMIC
   3  *
   4  * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether expressed or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19
  20 #include <linux/mfd/lp873x.h>
  21
  22 #define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
  23                          _delay, _lr, _cr)                              \
  24         [_id] = {                                                       \
  25                 .desc = {                                               \
  26                         .name                   = _name,                \
  27                         .supply_name            = _of "-in",            \
  28                         .id                     = _id,                  \
  29                         .of_match               = of_match_ptr(_of),    \
  30                         .regulators_node        = of_match_ptr("regulators"),\
  31                         .ops                    = &_ops,                \
  32                         .n_voltages             = _n,                   \
  33                         .type                   = REGULATOR_VOLTAGE,    \
  34                         .owner                  = THIS_MODULE,          \
  35                         .vsel_reg               = _vr,                  \
  36                         .vsel_mask              = _vm,                  \
  37                         .enable_reg             = _er,                  \
  38                         .enable_mask            = _em,                  \
  39                         .ramp_delay             = _delay,               \
  40                         .linear_ranges          = _lr,                  \
  41                         .n_linear_ranges        = ARRAY_SIZE(_lr),      \
  42                         .curr_table     = lp873x_buck_uA,               \
  43                         .n_current_limits = ARRAY_SIZE(lp873x_buck_uA), \
  44                         .csel_reg       = (_cr),                        \
  45                         .csel_mask      = LP873X_BUCK0_CTRL_2_BUCK0_ILIM,\
  46                 },                                                      \
  47                 .ctrl2_reg = _cr,                                       \
  48         }
  49
  50 struct lp873x_regulator {
  51         struct regulator_desc desc;
  52         unsigned int ctrl2_reg;
  53 };
  54
  55 static const struct lp873x_regulator regulators[];
  56
  57 static const struct regulator_linear_range buck0_buck1_ranges[] = {
  58         REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
  59         REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
  60         REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
  61         REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
  62 };
  63
  64 static const struct regulator_linear_range ldo0_ldo1_ranges[] = {
  65         REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
  66 };
  67
  68 static const unsigned int lp873x_buck_ramp_delay[] = {
  69         30000, 15000, 10000, 7500, 3800, 1900, 940, 470
  70 };
  71
  72 /* LP873X BUCK current limit */
  73 static const unsigned int lp873x_buck_uA[] = {
  74         1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
  75 };
  76
  77 static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
  78                                       int ramp_delay)
  79 {
  80         int id = rdev_get_id(rdev);
  81         struct lp873x *lp873 = rdev_get_drvdata(rdev);
  82         unsigned int reg;
  83         int ret;
  84
  85         if (ramp_delay <= 470)
  86                 reg = 7;
  87         else if (ramp_delay <= 940)
  88                 reg = 6;
  89         else if (ramp_delay <= 1900)
  90                 reg = 5;
  91         else if (ramp_delay <= 3800)
  92                 reg = 4;
  93         else if (ramp_delay <= 7500)
  94                 reg = 3;
  95         else if (ramp_delay <= 10000)
  96                 reg = 2;
  97         else if (ramp_delay <= 15000)
  98                 reg = 1;
  99         else
 100                 reg = 0;
 101
 102         ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
 103                                  LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
 104                                  reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
 105         if (ret) {
 106                 dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
 107                 return ret;
 108         }
 109
 110         rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];
 111
 112         return 0;
 113 }
 114
 115 /* Operations permitted on BUCK0, BUCK1 */
 116 static const struct regulator_ops lp873x_buck01_ops = {
 117         .is_enabled             = regulator_is_enabled_regmap,
 118         .enable                 = regulator_enable_regmap,
 119         .disable                = regulator_disable_regmap,
 120         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 121         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 122         .list_voltage           = regulator_list_voltage_linear_range,
 123         .map_voltage            = regulator_map_voltage_linear_range,
 124         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 125         .set_ramp_delay         = lp873x_buck_set_ramp_delay,
 126         .set_current_limit      = regulator_set_current_limit_regmap,
 127         .get_current_limit      = regulator_get_current_limit_regmap,
 128 };
 129
 130 /* Operations permitted on LDO0 and LDO1 */
 131 static const struct regulator_ops lp873x_ldo01_ops = {
 132         .is_enabled             = regulator_is_enabled_regmap,
 133         .enable                 = regulator_enable_regmap,
 134         .disable                = regulator_disable_regmap,
 135         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 136         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 137         .list_voltage           = regulator_list_voltage_linear_range,
 138         .map_voltage            = regulator_map_voltage_linear_range,
 139 };
 140
 141 static const struct lp873x_regulator regulators[] = {
 142         LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
 143                          256, LP873X_REG_BUCK0_VOUT,
 144                          LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
 145                          LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
 146                          buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
 147         LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
 148                          256, LP873X_REG_BUCK1_VOUT,
 149                          LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
 150                          LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
 151                          buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
 152         LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
 153                          LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
 154                          LP873X_REG_LDO0_CTRL,
 155                          LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
 156         LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
 157                          LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
 158                          LP873X_REG_LDO1_CTRL,
 159                          LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
 160 };
 161
 162 static int lp873x_regulator_probe(struct platform_device *pdev)
 163 {
 164         struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
 165         struct regulator_config config = { };
 166         struct regulator_dev *rdev;
 167         int i;
 168
 169         platform_set_drvdata(pdev, lp873);
 170
 171         config.dev = &pdev->dev;
 172         config.dev->of_node = lp873->dev->of_node;
 173         config.driver_data = lp873;
 174         config.regmap = lp873->regmap;
 175
 176         for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 177                 rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
 178                                                &config);
 179                 if (IS_ERR(rdev)) {
 180                         dev_err(lp873->dev, "failed to register %s regulator\n",
 181                                 pdev->name);
 182                         return PTR_ERR(rdev);
 183                 }
 184         }
 185
 186         return 0;
 187 }
 188
 189 static const struct platform_device_id lp873x_regulator_id_table[] = {
 190         { "lp873x-regulator", },
 191         { /* sentinel */ }
 192 };
 193 MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);
 194
 195 static struct platform_driver lp873x_regulator_driver = {
 196         .driver = {
 197                 .name = "lp873x-pmic",
 198         },
 199         .probe = lp873x_regulator_probe,
 200         .id_table = lp873x_regulator_id_table,
 201 };
 202 module_platform_driver(lp873x_regulator_driver);
 203
 204 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 205 MODULE_DESCRIPTION("LP873X voltage regulator driver");
 206 MODULE_ALIAS("platform:lp873x-pmic");
 207 MODULE_LICENSE("GPL v2");