drivers/regulator/lp87565-regulator.c

   1 /*
   2  * Regulator driver for LP87565 PMIC
   3  *
   4  * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
   5  *
   6  *  This program is free software; you can redistribute  it and/or modify it
   7  *  under  the terms of  the GNU General  Public License as published by the
   8  *  Free Software Foundation version 2.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/regmap.h>
  14
  15 #include <linux/mfd/lp87565.h>
  16
  17 #define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
  18                          _delay, _lr, _cr)                              \
  19         [_id] = {                                                       \
  20                 .desc = {                                               \
  21                         .name                   = _name,                \
  22                         .supply_name            = _of "-in",            \
  23                         .id                     = _id,                  \
  24                         .of_match               = of_match_ptr(_of),    \
  25                         .regulators_node        = of_match_ptr("regulators"),\
  26                         .ops                    = &_ops,                \
  27                         .n_voltages             = _n,                   \
  28                         .type                   = REGULATOR_VOLTAGE,    \
  29                         .owner                  = THIS_MODULE,          \
  30                         .vsel_reg               = _vr,                  \
  31                         .vsel_mask              = _vm,                  \
  32                         .enable_reg             = _er,                  \
  33                         .enable_mask            = _em,                  \
  34                         .ramp_delay             = _delay,               \
  35                         .linear_ranges          = _lr,                  \
  36                         .n_linear_ranges        = ARRAY_SIZE(_lr),      \
  37                 },                                                      \
  38                 .ctrl2_reg = _cr,                                       \
  39         }
  40
  41 struct lp87565_regulator {
  42         struct regulator_desc desc;
  43         unsigned int ctrl2_reg;
  44 };
  45
  46 static const struct lp87565_regulator regulators[];
  47
  48 static const struct regulator_linear_range buck0_1_2_3_ranges[] = {
  49         REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000),
  50         REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
  51         REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
  52 };
  53
  54 static const unsigned int lp87565_buck_ramp_delay[] = {
  55         30000, 15000, 10000, 7500, 3800, 1900, 940, 470
  56 };
  57
  58 /* LP87565 BUCK current limit */
  59 static const unsigned int lp87565_buck_uA[] = {
  60         1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
  61 };
  62
  63 static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
  64                                        int ramp_delay)
  65 {
  66         int id = rdev_get_id(rdev);
  67         struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
  68         unsigned int reg;
  69         int ret;
  70
  71         if (ramp_delay <= 470)
  72                 reg = 7;
  73         else if (ramp_delay <= 940)
  74                 reg = 6;
  75         else if (ramp_delay <= 1900)
  76                 reg = 5;
  77         else if (ramp_delay <= 3800)
  78                 reg = 4;
  79         else if (ramp_delay <= 7500)
  80                 reg = 3;
  81         else if (ramp_delay <= 10000)
  82                 reg = 2;
  83         else if (ramp_delay <= 15000)
  84                 reg = 1;
  85         else
  86                 reg = 0;
  87
  88         ret = regmap_update_bits(lp87565->regmap, regulators[id].ctrl2_reg,
  89                                  LP87565_BUCK_CTRL_2_SLEW_RATE,
  90                                  reg << __ffs(LP87565_BUCK_CTRL_2_SLEW_RATE));
  91         if (ret) {
  92                 dev_err(lp87565->dev, "SLEW RATE write failed: %d\n", ret);
  93                 return ret;
  94         }
  95
  96         rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];
  97
  98         /* Conservatively give a 15% margin */
  99         rdev->constraints->ramp_delay =
 100                                 rdev->constraints->ramp_delay * 85 / 100;
 101
 102         return 0;
 103 }
 104
 105 static int lp87565_buck_set_current_limit(struct regulator_dev *rdev,
 106                                           int min_uA, int max_uA)
 107 {
 108         int id = rdev_get_id(rdev);
 109         struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
 110         int i;
 111
 112         for (i = ARRAY_SIZE(lp87565_buck_uA) - 1; i >= 0; i--) {
 113                 if (lp87565_buck_uA[i] >= min_uA &&
 114                     lp87565_buck_uA[i] <= max_uA)
 115                         return regmap_update_bits(lp87565->regmap,
 116                                                   regulators[id].ctrl2_reg,
 117                                                   LP87565_BUCK_CTRL_2_ILIM,
 118                                                   i << __ffs(LP87565_BUCK_CTRL_2_ILIM));
 119         }
 120
 121         return -EINVAL;
 122 }
 123
 124 static int lp87565_buck_get_current_limit(struct regulator_dev *rdev)
 125 {
 126         int id = rdev_get_id(rdev);
 127         struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
 128         int ret;
 129         unsigned int val;
 130
 131         ret = regmap_read(lp87565->regmap, regulators[id].ctrl2_reg, &val);
 132         if (ret)
 133                 return ret;
 134
 135         val = (val & LP87565_BUCK_CTRL_2_ILIM) >>
 136                __ffs(LP87565_BUCK_CTRL_2_ILIM);
 137
 138         return (val < ARRAY_SIZE(lp87565_buck_uA)) ?
 139                         lp87565_buck_uA[val] : -EINVAL;
 140 }
 141
 142 /* Operations permitted on BUCK0, BUCK1 */
 143 static const struct regulator_ops lp87565_buck_ops = {
 144         .is_enabled             = regulator_is_enabled_regmap,
 145         .enable                 = regulator_enable_regmap,
 146         .disable                = regulator_disable_regmap,
 147         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 148         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 149         .list_voltage           = regulator_list_voltage_linear_range,
 150         .map_voltage            = regulator_map_voltage_linear_range,
 151         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 152         .set_ramp_delay         = lp87565_buck_set_ramp_delay,
 153         .set_current_limit      = lp87565_buck_set_current_limit,
 154         .get_current_limit      = lp87565_buck_get_current_limit,
 155 };
 156
 157 static const struct lp87565_regulator regulators[] = {
 158         LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
 159                           256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
 160                           LP87565_REG_BUCK0_CTRL_1,
 161                           LP87565_BUCK_CTRL_1_EN, 3230,
 162                           buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
 163         LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
 164                           256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
 165                           LP87565_REG_BUCK1_CTRL_1,
 166                           LP87565_BUCK_CTRL_1_EN, 3230,
 167                           buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
 168         LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
 169                           256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
 170                           LP87565_REG_BUCK2_CTRL_1,
 171                           LP87565_BUCK_CTRL_1_EN, 3230,
 172                           buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
 173         LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
 174                           256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
 175                           LP87565_REG_BUCK3_CTRL_1,
 176                           LP87565_BUCK_CTRL_1_EN, 3230,
 177                           buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
 178         LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
 179                           256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
 180                           LP87565_REG_BUCK0_CTRL_1,
 181                           LP87565_BUCK_CTRL_1_EN |
 182                           LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
 183                           buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
 184         LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
 185                           256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
 186                           LP87565_REG_BUCK2_CTRL_1,
 187                           LP87565_BUCK_CTRL_1_EN, 3230,
 188                           buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
 189 };
 190
 191 static int lp87565_regulator_probe(struct platform_device *pdev)
 192 {
 193         struct lp87565 *lp87565 = dev_get_drvdata(pdev->dev.parent);
 194         struct regulator_config config = { };
 195         struct regulator_dev *rdev;
 196         int i, min_idx = LP87565_BUCK_1, max_idx = LP87565_BUCK_3;
 197
 198         platform_set_drvdata(pdev, lp87565);
 199
 200         config.dev = &pdev->dev;
 201         config.dev->of_node = lp87565->dev->of_node;
 202         config.driver_data = lp87565;
 203         config.regmap = lp87565->regmap;
 204
 205         if (lp87565->dev_type == LP87565_DEVICE_TYPE_LP87565_Q1) {
 206                 min_idx = LP87565_BUCK_10;
 207                 max_idx = LP87565_BUCK_23;
 208         }
 209
 210         for (i = min_idx; i <= max_idx; i++) {
 211                 rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
 212                                                &config);
 213                 if (IS_ERR(rdev)) {
 214                         dev_err(lp87565->dev, "failed to register %s regulator\n",
 215                                 pdev->name);
 216                         return PTR_ERR(rdev);
 217                 }
 218         }
 219
 220         return 0;
 221 }
 222
 223 static const struct platform_device_id lp87565_regulator_id_table[] = {
 224         { "lp87565-regulator", },
 225         { "lp87565-q1-regulator", },
 226         { /* sentinel */ }
 227 };
 228 MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table);
 229
 230 static struct platform_driver lp87565_regulator_driver = {
 231         .driver = {
 232                 .name = "lp87565-pmic",
 233         },
 234         .probe = lp87565_regulator_probe,
 235         .id_table = lp87565_regulator_id_table,
 236 };
 237 module_platform_driver(lp87565_regulator_driver);
 238
 239 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 240 MODULE_DESCRIPTION("LP87565 voltage regulator driver");
 241 MODULE_LICENSE("GPL v2");