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