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