drivers/regulator/lp87565-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Regulator driver for LP87565 PMIC
   4  *
   5  * Copyright (C) 2017 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/lp87565.h>
  14
  15 enum LP87565_regulator_id {
  16         /* BUCK's */
  17         LP87565_BUCK_0,
  18         LP87565_BUCK_1,
  19         LP87565_BUCK_2,
  20         LP87565_BUCK_3,
  21         LP87565_BUCK_10,
  22         LP87565_BUCK_23,
  23         LP87565_BUCK_3210,
  24 };
  25
  26 #define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm,          \
  27                           _er, _em, _ev, _delay, _lr, _cr)              \
  28         [_id] = {                                                       \
  29                 .desc = {                                               \
  30                         .name                   = _name,                \
  31                         .supply_name            = _of "-in",            \
  32                         .id                     = _id,                  \
  33                         .of_match               = _of,                  \
  34                         .regulators_node        = "regulators",         \
  35                         .ops                    = &_ops,                \
  36                         .n_voltages             = _n,                   \
  37                         .type                   = REGULATOR_VOLTAGE,    \
  38                         .owner                  = THIS_MODULE,          \
  39                         .vsel_reg               = _vr,                  \
  40                         .vsel_mask              = _vm,                  \
  41                         .enable_reg             = _er,                  \
  42                         .enable_mask            = _em,                  \
  43                         .enable_val             = _ev,                  \
  44                         .ramp_delay             = _delay,               \
  45                         .linear_ranges          = _lr,                  \
  46                         .n_linear_ranges        = ARRAY_SIZE(_lr),      \
  47                         .curr_table = lp87565_buck_uA,                  \
  48                         .n_current_limits = ARRAY_SIZE(lp87565_buck_uA),\
  49                         .csel_reg = (_cr),                              \
  50                         .csel_mask = LP87565_BUCK_CTRL_2_ILIM,          \
  51                 },                                                      \
  52                 .ctrl2_reg = _cr,                                       \
  53         }
  54
  55 struct lp87565_regulator {
  56         struct regulator_desc desc;
  57         unsigned int ctrl2_reg;
  58 };
  59
  60 static const struct lp87565_regulator regulators[];
  61
  62 static const struct linear_range buck0_1_2_3_ranges[] = {
  63         REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000),
  64         REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
  65         REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
  66 };
  67
  68 static const unsigned int lp87565_buck_ramp_delay[] = {
  69         30000, 15000, 10000, 7500, 3800, 1900, 940, 470
  70 };
  71
  72 /* LP87565 BUCK current limit */
  73 static const unsigned int lp87565_buck_uA[] = {
  74         1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
  75 };
  76
  77 static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
  78                                        int ramp_delay)
  79 {
  80         int id = rdev_get_id(rdev);
  81         unsigned int reg;
  82         int ret;
  83
  84         if (ramp_delay <= 470)
  85                 reg = 7;
  86         else if (ramp_delay <= 940)
  87                 reg = 6;
  88         else if (ramp_delay <= 1900)
  89                 reg = 5;
  90         else if (ramp_delay <= 3800)
  91                 reg = 4;
  92         else if (ramp_delay <= 7500)
  93                 reg = 3;
  94         else if (ramp_delay <= 10000)
  95                 reg = 2;
  96         else if (ramp_delay <= 15000)
  97                 reg = 1;
  98         else
  99                 reg = 0;
 100
 101         ret = regmap_update_bits(rdev->regmap, regulators[id].ctrl2_reg,
 102                                  LP87565_BUCK_CTRL_2_SLEW_RATE,
 103                                  FIELD_PREP(LP87565_BUCK_CTRL_2_SLEW_RATE, reg));
 104         if (ret) {
 105                 dev_err(&rdev->dev, "SLEW RATE write failed: %d\n", ret);
 106                 return ret;
 107         }
 108
 109         rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];
 110
 111         /* Conservatively give a 15% margin */
 112         rdev->constraints->ramp_delay =
 113                                 rdev->constraints->ramp_delay * 85 / 100;
 114
 115         return 0;
 116 }
 117
 118 /* Operations permitted on BUCKs */
 119 static const struct regulator_ops lp87565_buck_ops = {
 120         .is_enabled             = regulator_is_enabled_regmap,
 121         .enable                 = regulator_enable_regmap,
 122         .disable                = regulator_disable_regmap,
 123         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 124         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 125         .list_voltage           = regulator_list_voltage_linear_range,
 126         .map_voltage            = regulator_map_voltage_linear_range,
 127         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 128         .set_ramp_delay         = lp87565_buck_set_ramp_delay,
 129         .set_current_limit      = regulator_set_current_limit_regmap,
 130         .get_current_limit      = regulator_get_current_limit_regmap,
 131 };
 132
 133 static const struct lp87565_regulator regulators[] = {
 134         LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
 135                           256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
 136                           LP87565_REG_BUCK0_CTRL_1,
 137                           LP87565_BUCK_CTRL_1_EN |
 138                           LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
 139                           LP87565_BUCK_CTRL_1_EN, 3230,
 140                           buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
 141         LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
 142                           256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
 143                           LP87565_REG_BUCK1_CTRL_1,
 144                           LP87565_BUCK_CTRL_1_EN |
 145                           LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
 146                           LP87565_BUCK_CTRL_1_EN, 3230,
 147                           buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
 148         LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
 149                           256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
 150                           LP87565_REG_BUCK2_CTRL_1,
 151                           LP87565_BUCK_CTRL_1_EN |
 152                           LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
 153                           LP87565_BUCK_CTRL_1_EN, 3230,
 154                           buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
 155         LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
 156                           256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
 157                           LP87565_REG_BUCK3_CTRL_1,
 158                           LP87565_BUCK_CTRL_1_EN |
 159                           LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
 160                           LP87565_BUCK_CTRL_1_EN, 3230,
 161                           buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
 162         LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
 163                           256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
 164                           LP87565_REG_BUCK0_CTRL_1,
 165                           LP87565_BUCK_CTRL_1_EN |
 166                           LP87565_BUCK_CTRL_1_EN_PIN_CTRL |
 167                           LP87565_BUCK_CTRL_1_FPWM_MP_0_2,
 168                           LP87565_BUCK_CTRL_1_EN |
 169                           LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
 170                           buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
 171         LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
 172                           256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
 173                           LP87565_REG_BUCK2_CTRL_1,
 174                           LP87565_BUCK_CTRL_1_EN |
 175                           LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
 176                           LP87565_BUCK_CTRL_1_EN, 3230,
 177                           buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
 178         LP87565_REGULATOR("BUCK3210", LP87565_BUCK_3210, "buck3210",
 179                           lp87565_buck_ops, 256, LP87565_REG_BUCK0_VOUT,
 180                           LP87565_BUCK_VSET, LP87565_REG_BUCK0_CTRL_1,
 181                           LP87565_BUCK_CTRL_1_EN |
 182                           LP87565_BUCK_CTRL_1_EN_PIN_CTRL |
 183                           LP87565_BUCK_CTRL_1_FPWM_MP_0_2,
 184                           LP87565_BUCK_CTRL_1_EN |
 185                           LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
 186                           buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
 187 };
 188
 189 static int lp87565_regulator_probe(struct platform_device *pdev)
 190 {
 191         struct lp87565 *lp87565 = dev_get_drvdata(pdev->dev.parent);
 192         struct regulator_config config = { };
 193         struct regulator_dev *rdev;
 194         int i, min_idx, max_idx;
 195
 196         platform_set_drvdata(pdev, lp87565);
 197
 198         config.dev = &pdev->dev;
 199         config.dev->of_node = lp87565->dev->of_node;
 200         config.driver_data = lp87565;
 201         config.regmap = lp87565->regmap;
 202
 203         switch (lp87565->dev_type) {
 204         case LP87565_DEVICE_TYPE_LP87565_Q1:
 205                 min_idx = LP87565_BUCK_10;
 206                 max_idx = LP87565_BUCK_23;
 207                 break;
 208         case LP87565_DEVICE_TYPE_LP87561_Q1:
 209                 min_idx = LP87565_BUCK_3210;
 210                 max_idx = LP87565_BUCK_3210;
 211                 break;
 212         default:
 213                 min_idx = LP87565_BUCK_0;
 214                 max_idx = LP87565_BUCK_3;
 215                 break;
 216         }
 217
 218         for (i = min_idx; i <= max_idx; i++) {
 219                 rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
 220                                                &config);
 221                 if (IS_ERR(rdev)) {
 222                         dev_err(lp87565->dev, "failed to register %s regulator\n",
 223                                 pdev->name);
 224                         return PTR_ERR(rdev);
 225                 }
 226         }
 227
 228         return 0;
 229 }
 230
 231 static const struct platform_device_id lp87565_regulator_id_table[] = {
 232         { "lp87565-regulator", },
 233         { "lp87565-q1-regulator", },
 234         { /* sentinel */ }
 235 };
 236 MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table);
 237
 238 static struct platform_driver lp87565_regulator_driver = {
 239         .driver = {
 240                 .name = "lp87565-pmic",
 241                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 242         },
 243         .probe = lp87565_regulator_probe,
 244         .id_table = lp87565_regulator_id_table,
 245 };
 246 module_platform_driver(lp87565_regulator_driver);
 247
 248 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 249 MODULE_DESCRIPTION("LP87565 voltage regulator driver");
 250 MODULE_LICENSE("GPL v2");