drivers/regulator/arizona-ldo1.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // arizona-ldo1.c  --  LDO1 supply for Arizona devices
   4 //
   5 // Copyright 2012 Wolfson Microelectronics PLC.
   6 //
   7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8
   9 #include <linux/module.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/init.h>
  12 #include <linux/bitops.h>
  13 #include <linux/err.h>
  14 #include <linux/of.h>
  15 #include <linux/gpio/consumer.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/regulator/driver.h>
  18 #include <linux/regulator/machine.h>
  19 #include <linux/regulator/of_regulator.h>
  20 #include <linux/slab.h>
  21
  22 #include <linux/regulator/arizona-ldo1.h>
  23
  24 #include <linux/mfd/arizona/core.h>
  25 #include <linux/mfd/arizona/pdata.h>
  26 #include <linux/mfd/arizona/registers.h>
  27
  28 struct arizona_ldo1 {
  29         struct regulator_dev *regulator;
  30         struct regmap *regmap;
  31
  32         struct regulator_consumer_supply supply;
  33         struct regulator_init_data init_data;
  34
  35         struct gpio_desc *ena_gpiod;
  36 };
  37
  38 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
  39                                            unsigned sel)
  40 {
  41         struct regmap *regmap = rdev_get_regmap(rdev);
  42         unsigned int val;
  43         int ret;
  44
  45         if (sel == rdev->desc->n_voltages - 1)
  46                 val = ARIZONA_LDO1_HI_PWR;
  47         else
  48                 val = 0;
  49
  50         ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
  51                                  ARIZONA_LDO1_HI_PWR, val);
  52         if (ret != 0)
  53                 return ret;
  54
  55         if (val)
  56                 return 0;
  57
  58         return regulator_set_voltage_sel_regmap(rdev, sel);
  59 }
  60
  61 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
  62 {
  63         struct regmap *regmap = rdev_get_regmap(rdev);
  64         unsigned int val;
  65         int ret;
  66
  67         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
  68         if (ret != 0)
  69                 return ret;
  70
  71         if (val & ARIZONA_LDO1_HI_PWR)
  72                 return rdev->desc->n_voltages - 1;
  73
  74         return regulator_get_voltage_sel_regmap(rdev);
  75 }
  76
  77 static const struct regulator_ops arizona_ldo1_hc_ops = {
  78         .list_voltage = regulator_list_voltage_linear_range,
  79         .map_voltage = regulator_map_voltage_linear_range,
  80         .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
  81         .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
  82         .get_bypass = regulator_get_bypass_regmap,
  83         .set_bypass = regulator_set_bypass_regmap,
  84 };
  85
  86 static const struct regulator_linear_range arizona_ldo1_hc_ranges[] = {
  87         REGULATOR_LINEAR_RANGE(900000, 0, 0x6, 50000),
  88         REGULATOR_LINEAR_RANGE(1800000, 0x7, 0x7, 0),
  89 };
  90
  91 static const struct regulator_desc arizona_ldo1_hc = {
  92         .name = "LDO1",
  93         .supply_name = "LDOVDD",
  94         .type = REGULATOR_VOLTAGE,
  95         .ops = &arizona_ldo1_hc_ops,
  96
  97         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
  98         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
  99         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
 100         .bypass_mask = ARIZONA_LDO1_BYPASS,
 101         .linear_ranges = arizona_ldo1_hc_ranges,
 102         .n_linear_ranges = ARRAY_SIZE(arizona_ldo1_hc_ranges),
 103         .n_voltages = 8,
 104         .enable_time = 1500,
 105         .ramp_delay = 24000,
 106
 107         .owner = THIS_MODULE,
 108 };
 109
 110 static const struct regulator_ops arizona_ldo1_ops = {
 111         .list_voltage = regulator_list_voltage_linear,
 112         .map_voltage = regulator_map_voltage_linear,
 113         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 114         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 115 };
 116
 117 static const struct regulator_desc arizona_ldo1 = {
 118         .name = "LDO1",
 119         .supply_name = "LDOVDD",
 120         .type = REGULATOR_VOLTAGE,
 121         .ops = &arizona_ldo1_ops,
 122
 123         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
 124         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
 125         .min_uV = 900000,
 126         .uV_step = 25000,
 127         .n_voltages = 13,
 128         .enable_time = 500,
 129         .ramp_delay = 24000,
 130
 131         .owner = THIS_MODULE,
 132 };
 133
 134 static const struct regulator_init_data arizona_ldo1_dvfs = {
 135         .constraints = {
 136                 .min_uV = 1200000,
 137                 .max_uV = 1800000,
 138                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 139                                   REGULATOR_CHANGE_VOLTAGE,
 140         },
 141         .num_consumer_supplies = 1,
 142 };
 143
 144 static const struct regulator_init_data arizona_ldo1_default = {
 145         .constraints = {
 146                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 147         },
 148         .num_consumer_supplies = 1,
 149 };
 150
 151 static const struct regulator_init_data arizona_ldo1_wm5110 = {
 152         .constraints = {
 153                 .min_uV = 1175000,
 154                 .max_uV = 1200000,
 155                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 156                                   REGULATOR_CHANGE_VOLTAGE,
 157         },
 158         .num_consumer_supplies = 1,
 159 };
 160
 161 static int arizona_ldo1_of_get_pdata(struct arizona_ldo1_pdata *pdata,
 162                                      struct regulator_config *config,
 163                                      const struct regulator_desc *desc,
 164                                      bool *external_dcvdd)
 165 {
 166         struct arizona_ldo1 *ldo1 = config->driver_data;
 167         struct device_node *np = config->dev->of_node;
 168         struct device_node *init_node, *dcvdd_node;
 169         struct regulator_init_data *init_data;
 170
 171         init_node = of_get_child_by_name(np, "ldo1");
 172         dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
 173
 174         if (init_node) {
 175                 config->of_node = init_node;
 176
 177                 init_data = of_get_regulator_init_data(config->dev, init_node,
 178                                                        desc);
 179                 if (init_data) {
 180                         init_data->consumer_supplies = &ldo1->supply;
 181                         init_data->num_consumer_supplies = 1;
 182
 183                         if (dcvdd_node && dcvdd_node != init_node)
 184                                 *external_dcvdd = true;
 185
 186                         pdata->init_data = init_data;
 187                 }
 188         } else if (dcvdd_node) {
 189                 *external_dcvdd = true;
 190         }
 191
 192         of_node_put(dcvdd_node);
 193
 194         return 0;
 195 }
 196
 197 static int arizona_ldo1_common_init(struct platform_device *pdev,
 198                                     struct arizona_ldo1 *ldo1,
 199                                     const struct regulator_desc *desc,
 200                                     struct arizona_ldo1_pdata *pdata,
 201                                     bool *external_dcvdd)
 202 {
 203         struct device *parent_dev = pdev->dev.parent;
 204         struct regulator_config config = { };
 205         int ret;
 206
 207         *external_dcvdd = false;
 208
 209         ldo1->supply.supply = "DCVDD";
 210         ldo1->init_data.consumer_supplies = &ldo1->supply;
 211         ldo1->supply.dev_name = dev_name(parent_dev);
 212
 213         config.dev = parent_dev;
 214         config.driver_data = ldo1;
 215         config.regmap = ldo1->regmap;
 216
 217         if (IS_ENABLED(CONFIG_OF)) {
 218                 if (!dev_get_platdata(parent_dev)) {
 219                         ret = arizona_ldo1_of_get_pdata(pdata,
 220                                                         &config, desc,
 221                                                         external_dcvdd);
 222                         if (ret < 0)
 223                                 return ret;
 224                 }
 225         }
 226
 227         /* We assume that high output = regulator off
 228          * Don't use devm, since we need to get against the parent device
 229          * so clean up would happen at the wrong time
 230          */
 231         config.ena_gpiod = gpiod_get_optional(parent_dev, "wlf,ldoena",
 232                                 GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
 233         if (IS_ERR(config.ena_gpiod))
 234                 return PTR_ERR(config.ena_gpiod);
 235
 236         ldo1->ena_gpiod = config.ena_gpiod;
 237
 238         if (pdata->init_data)
 239                 config.init_data = pdata->init_data;
 240         else
 241                 config.init_data = &ldo1->init_data;
 242
 243         /*
 244          * LDO1 can only be used to supply DCVDD so if it has no
 245          * consumers then DCVDD is supplied externally.
 246          */
 247         if (config.init_data->num_consumer_supplies == 0)
 248                 *external_dcvdd = true;
 249
 250         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
 251
 252         of_node_put(config.of_node);
 253
 254         if (IS_ERR(ldo1->regulator)) {
 255                 ret = PTR_ERR(ldo1->regulator);
 256                 dev_err(&pdev->dev, "Failed to register LDO1 supply: %d\n",
 257                         ret);
 258                 return ret;
 259         }
 260
 261         platform_set_drvdata(pdev, ldo1);
 262
 263         return 0;
 264 }
 265
 266 static int arizona_ldo1_probe(struct platform_device *pdev)
 267 {
 268         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 269         struct arizona_ldo1 *ldo1;
 270         const struct regulator_desc *desc;
 271         bool external_dcvdd;
 272         int ret;
 273
 274         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
 275         if (!ldo1)
 276                 return -ENOMEM;
 277
 278         ldo1->regmap = arizona->regmap;
 279
 280         /*
 281          * Since the chip usually supplies itself we provide some
 282          * default init_data for it.  This will be overridden with
 283          * platform data if provided.
 284          */
 285         switch (arizona->type) {
 286         case WM5102:
 287         case WM8997:
 288         case WM8998:
 289         case WM1814:
 290                 desc = &arizona_ldo1_hc;
 291                 ldo1->init_data = arizona_ldo1_dvfs;
 292                 break;
 293         case WM5110:
 294         case WM8280:
 295                 desc = &arizona_ldo1;
 296                 ldo1->init_data = arizona_ldo1_wm5110;
 297                 break;
 298         default:
 299                 desc = &arizona_ldo1;
 300                 ldo1->init_data = arizona_ldo1_default;
 301                 break;
 302         }
 303
 304         ret = arizona_ldo1_common_init(pdev, ldo1, desc,
 305                                        &arizona->pdata.ldo1,
 306                                        &external_dcvdd);
 307         if (ret == 0)
 308                 arizona->external_dcvdd = external_dcvdd;
 309
 310         return ret;
 311 }
 312
 313 static int arizona_ldo1_remove(struct platform_device *pdev)
 314 {
 315         struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
 316
 317         if (ldo1->ena_gpiod)
 318                 gpiod_put(ldo1->ena_gpiod);
 319
 320         return 0;
 321 }
 322
 323 static struct platform_driver arizona_ldo1_driver = {
 324         .probe = arizona_ldo1_probe,
 325         .remove = arizona_ldo1_remove,
 326         .driver         = {
 327                 .name   = "arizona-ldo1",
 328         },
 329 };
 330
 331 module_platform_driver(arizona_ldo1_driver);
 332
 333 /* Module information */
 334 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 335 MODULE_DESCRIPTION("Arizona LDO1 driver");
 336 MODULE_LICENSE("GPL");
 337 MODULE_ALIAS("platform:arizona-ldo1");