drivers/regulator/bd70528-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2018 ROHM Semiconductors
   3 // bd70528-regulator.c ROHM BD70528MWV regulator driver
   4
   5 #include <linux/delay.h>
   6 #include <linux/err.h>
   7 #include <linux/gpio.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mfd/rohm-bd70528.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regmap.h>
  15 #include <linux/regulator/driver.h>
  16 #include <linux/regulator/machine.h>
  17 #include <linux/regulator/of_regulator.h>
  18 #include <linux/slab.h>
  19
  20 #define BUCK_RAMPRATE_250MV 0
  21 #define BUCK_RAMPRATE_125MV 1
  22 #define BUCK_RAMP_MAX 250
  23
  24 static const struct regulator_linear_range bd70528_buck1_volts[] = {
  25         REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x1, 600000),
  26         REGULATOR_LINEAR_RANGE(2750000, 0x2, 0xf, 50000),
  27 };
  28 static const struct regulator_linear_range bd70528_buck2_volts[] = {
  29         REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x1, 300000),
  30         REGULATOR_LINEAR_RANGE(1550000, 0x2, 0xd, 50000),
  31         REGULATOR_LINEAR_RANGE(3000000, 0xe, 0xf, 300000),
  32 };
  33 static const struct regulator_linear_range bd70528_buck3_volts[] = {
  34         REGULATOR_LINEAR_RANGE(800000, 0x00, 0xd, 50000),
  35         REGULATOR_LINEAR_RANGE(1800000, 0xe, 0xf, 0),
  36 };
  37
  38 /* All LDOs have same voltage ranges */
  39 static const struct regulator_linear_range bd70528_ldo_volts[] = {
  40         REGULATOR_LINEAR_RANGE(1650000, 0x0, 0x07, 50000),
  41         REGULATOR_LINEAR_RANGE(2100000, 0x8, 0x0f, 100000),
  42         REGULATOR_LINEAR_RANGE(2850000, 0x10, 0x19, 50000),
  43         REGULATOR_LINEAR_RANGE(3300000, 0x19, 0x1f, 0),
  44 };
  45
  46 /* Also both LEDs support same voltages */
  47 static const unsigned int led_volts[] = {
  48         20000, 30000
  49 };
  50
  51 static int bd70528_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
  52 {
  53         if (ramp_delay > 0 && ramp_delay <= BUCK_RAMP_MAX) {
  54                 unsigned int ramp_value = BUCK_RAMPRATE_250MV;
  55
  56                 if (ramp_delay <= 125)
  57                         ramp_value = BUCK_RAMPRATE_125MV;
  58
  59                 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
  60                                   BD70528_MASK_BUCK_RAMP,
  61                                   ramp_value << BD70528_SIFT_BUCK_RAMP);
  62         }
  63         dev_err(&rdev->dev, "%s: ramp_delay: %d not supported\n",
  64                 rdev->desc->name, ramp_delay);
  65         return -EINVAL;
  66 }
  67
  68 static int bd70528_led_set_voltage_sel(struct regulator_dev *rdev,
  69                                        unsigned int sel)
  70 {
  71         int ret;
  72
  73         ret = regulator_is_enabled_regmap(rdev);
  74         if (ret < 0)
  75                 return ret;
  76
  77         if (ret == 0)
  78                 return regulator_set_voltage_sel_regmap(rdev, sel);
  79
  80         dev_err(&rdev->dev,
  81                 "LED voltage change not allowed when led is enabled\n");
  82
  83         return -EBUSY;
  84 }
  85
  86 static const struct regulator_ops bd70528_buck_ops = {
  87         .enable = regulator_enable_regmap,
  88         .disable = regulator_disable_regmap,
  89         .is_enabled = regulator_is_enabled_regmap,
  90         .list_voltage = regulator_list_voltage_linear_range,
  91         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  92         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  93         .set_voltage_time_sel = regulator_set_voltage_time_sel,
  94         .set_ramp_delay = bd70528_set_ramp_delay,
  95 };
  96
  97 static const struct regulator_ops bd70528_ldo_ops = {
  98         .enable = regulator_enable_regmap,
  99         .disable = regulator_disable_regmap,
 100         .is_enabled = regulator_is_enabled_regmap,
 101         .list_voltage = regulator_list_voltage_linear_range,
 102         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 103         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 104         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 105         .set_ramp_delay = bd70528_set_ramp_delay,
 106 };
 107
 108 static const struct regulator_ops bd70528_led_ops = {
 109         .enable = regulator_enable_regmap,
 110         .disable = regulator_disable_regmap,
 111         .is_enabled = regulator_is_enabled_regmap,
 112         .list_voltage = regulator_list_voltage_table,
 113         .set_voltage_sel = bd70528_led_set_voltage_sel,
 114         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 115 };
 116
 117 static const struct regulator_desc bd70528_desc[] = {
 118         {
 119                 .name = "buck1",
 120                 .of_match = of_match_ptr("BUCK1"),
 121                 .regulators_node = of_match_ptr("regulators"),
 122                 .id = BD70528_BUCK1,
 123                 .ops = &bd70528_buck_ops,
 124                 .type = REGULATOR_VOLTAGE,
 125                 .linear_ranges = bd70528_buck1_volts,
 126                 .n_linear_ranges = ARRAY_SIZE(bd70528_buck1_volts),
 127                 .n_voltages = BD70528_BUCK_VOLTS,
 128                 .enable_reg = BD70528_REG_BUCK1_EN,
 129                 .enable_mask = BD70528_MASK_RUN_EN,
 130                 .vsel_reg = BD70528_REG_BUCK1_VOLT,
 131                 .vsel_mask = BD70528_MASK_BUCK_VOLT,
 132                 .owner = THIS_MODULE,
 133         },
 134         {
 135                 .name = "buck2",
 136                 .of_match = of_match_ptr("BUCK2"),
 137                 .regulators_node = of_match_ptr("regulators"),
 138                 .id = BD70528_BUCK2,
 139                 .ops = &bd70528_buck_ops,
 140                 .type = REGULATOR_VOLTAGE,
 141                 .linear_ranges = bd70528_buck2_volts,
 142                 .n_linear_ranges = ARRAY_SIZE(bd70528_buck2_volts),
 143                 .n_voltages = BD70528_BUCK_VOLTS,
 144                 .enable_reg = BD70528_REG_BUCK2_EN,
 145                 .enable_mask = BD70528_MASK_RUN_EN,
 146                 .vsel_reg = BD70528_REG_BUCK2_VOLT,
 147                 .vsel_mask = BD70528_MASK_BUCK_VOLT,
 148                 .owner = THIS_MODULE,
 149         },
 150         {
 151                 .name = "buck3",
 152                 .of_match = of_match_ptr("BUCK3"),
 153                 .regulators_node = of_match_ptr("regulators"),
 154                 .id = BD70528_BUCK3,
 155                 .ops = &bd70528_buck_ops,
 156                 .type = REGULATOR_VOLTAGE,
 157                 .linear_ranges = bd70528_buck3_volts,
 158                 .n_linear_ranges = ARRAY_SIZE(bd70528_buck3_volts),
 159                 .n_voltages = BD70528_BUCK_VOLTS,
 160                 .enable_reg = BD70528_REG_BUCK3_EN,
 161                 .enable_mask = BD70528_MASK_RUN_EN,
 162                 .vsel_reg = BD70528_REG_BUCK3_VOLT,
 163                 .vsel_mask = BD70528_MASK_BUCK_VOLT,
 164                 .owner = THIS_MODULE,
 165         },
 166         {
 167                 .name = "ldo1",
 168                 .of_match = of_match_ptr("LDO1"),
 169                 .regulators_node = of_match_ptr("regulators"),
 170                 .id = BD70528_LDO1,
 171                 .ops = &bd70528_ldo_ops,
 172                 .type = REGULATOR_VOLTAGE,
 173                 .linear_ranges = bd70528_ldo_volts,
 174                 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
 175                 .n_voltages = BD70528_LDO_VOLTS,
 176                 .enable_reg = BD70528_REG_LDO1_EN,
 177                 .enable_mask = BD70528_MASK_RUN_EN,
 178                 .vsel_reg = BD70528_REG_LDO1_VOLT,
 179                 .vsel_mask = BD70528_MASK_LDO_VOLT,
 180                 .owner = THIS_MODULE,
 181         },
 182         {
 183                 .name = "ldo2",
 184                 .of_match = of_match_ptr("LDO2"),
 185                 .regulators_node = of_match_ptr("regulators"),
 186                 .id = BD70528_LDO2,
 187                 .ops = &bd70528_ldo_ops,
 188                 .type = REGULATOR_VOLTAGE,
 189                 .linear_ranges = bd70528_ldo_volts,
 190                 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
 191                 .n_voltages = BD70528_LDO_VOLTS,
 192                 .enable_reg = BD70528_REG_LDO2_EN,
 193                 .enable_mask = BD70528_MASK_RUN_EN,
 194                 .vsel_reg = BD70528_REG_LDO2_VOLT,
 195                 .vsel_mask = BD70528_MASK_LDO_VOLT,
 196                 .owner = THIS_MODULE,
 197         },
 198         {
 199                 .name = "ldo3",
 200                 .of_match = of_match_ptr("LDO3"),
 201                 .regulators_node = of_match_ptr("regulators"),
 202                 .id = BD70528_LDO3,
 203                 .ops = &bd70528_ldo_ops,
 204                 .type = REGULATOR_VOLTAGE,
 205                 .linear_ranges = bd70528_ldo_volts,
 206                 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
 207                 .n_voltages = BD70528_LDO_VOLTS,
 208                 .enable_reg = BD70528_REG_LDO3_EN,
 209                 .enable_mask = BD70528_MASK_RUN_EN,
 210                 .vsel_reg = BD70528_REG_LDO3_VOLT,
 211                 .vsel_mask = BD70528_MASK_LDO_VOLT,
 212                 .owner = THIS_MODULE,
 213         },
 214         {
 215                 .name = "ldo_led1",
 216                 .of_match = of_match_ptr("LDO_LED1"),
 217                 .regulators_node = of_match_ptr("regulators"),
 218                 .id = BD70528_LED1,
 219                 .ops = &bd70528_led_ops,
 220                 .type = REGULATOR_VOLTAGE,
 221                 .volt_table = &led_volts[0],
 222                 .n_voltages = ARRAY_SIZE(led_volts),
 223                 .enable_reg = BD70528_REG_LED_EN,
 224                 .enable_mask = BD70528_MASK_LED1_EN,
 225                 .vsel_reg = BD70528_REG_LED_VOLT,
 226                 .vsel_mask = BD70528_MASK_LED1_VOLT,
 227                 .owner = THIS_MODULE,
 228         },
 229         {
 230                 .name = "ldo_led2",
 231                 .of_match = of_match_ptr("LDO_LED2"),
 232                 .regulators_node = of_match_ptr("regulators"),
 233                 .id = BD70528_LED2,
 234                 .ops = &bd70528_led_ops,
 235                 .type = REGULATOR_VOLTAGE,
 236                 .volt_table = &led_volts[0],
 237                 .n_voltages = ARRAY_SIZE(led_volts),
 238                 .enable_reg = BD70528_REG_LED_EN,
 239                 .enable_mask = BD70528_MASK_LED2_EN,
 240                 .vsel_reg = BD70528_REG_LED_VOLT,
 241                 .vsel_mask = BD70528_MASK_LED2_VOLT,
 242                 .owner = THIS_MODULE,
 243         },
 244
 245 };
 246
 247 static int bd70528_probe(struct platform_device *pdev)
 248 {
 249         struct rohm_regmap_dev *bd70528;
 250         int i;
 251         struct regulator_config config = {
 252                 .dev = pdev->dev.parent,
 253         };
 254
 255         bd70528 = dev_get_drvdata(pdev->dev.parent);
 256         if (!bd70528) {
 257                 dev_err(&pdev->dev, "No MFD driver data\n");
 258                 return -EINVAL;
 259         }
 260
 261         config.regmap = bd70528->regmap;
 262
 263         for (i = 0; i < ARRAY_SIZE(bd70528_desc); i++) {
 264                 struct regulator_dev *rdev;
 265
 266                 rdev = devm_regulator_register(&pdev->dev, &bd70528_desc[i],
 267                                                &config);
 268                 if (IS_ERR(rdev)) {
 269                         dev_err(&pdev->dev,
 270                                 "failed to register %s regulator\n",
 271                                 bd70528_desc[i].name);
 272                         return PTR_ERR(rdev);
 273                 }
 274         }
 275         return 0;
 276 }
 277
 278 static struct platform_driver bd70528_regulator = {
 279         .driver = {
 280                 .name = "bd70528-pmic"
 281         },
 282         .probe = bd70528_probe,
 283 };
 284
 285 module_platform_driver(bd70528_regulator);
 286
 287 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
 288 MODULE_DESCRIPTION("BD70528 voltage regulator driver");
 289 MODULE_LICENSE("GPL");