drivers/regulator/as3711-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
   4  *
   5  * Copyright (C) 2012 Renesas Electronics Corporation
   6  * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
   7  */
   8
   9 #include <linux/err.h>
  10 #include <linux/init.h>
  11 #include <linux/mfd/as3711.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regmap.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/regulator/of_regulator.h>
  18 #include <linux/slab.h>
  19
  20 /*
  21  * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
  22  * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
  23  * FAST:        sdX_fast=1
  24  * NORMAL:      low_noise=1
  25  * IDLE:        low_noise=0
  26  */
  27
  28 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
  29 {
  30         unsigned int fast_bit = rdev->desc->enable_mask,
  31                 low_noise_bit = fast_bit << 4;
  32         u8 val;
  33
  34         switch (mode) {
  35         case REGULATOR_MODE_FAST:
  36                 val = fast_bit | low_noise_bit;
  37                 break;
  38         case REGULATOR_MODE_NORMAL:
  39                 val = low_noise_bit;
  40                 break;
  41         case REGULATOR_MODE_IDLE:
  42                 val = 0;
  43                 break;
  44         default:
  45                 return -EINVAL;
  46         }
  47
  48         return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
  49                                   low_noise_bit | fast_bit, val);
  50 }
  51
  52 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
  53 {
  54         unsigned int fast_bit = rdev->desc->enable_mask,
  55                 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
  56         unsigned int val;
  57         int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
  58
  59         if (ret < 0)
  60                 return ret;
  61
  62         if ((val & mask) == mask)
  63                 return REGULATOR_MODE_FAST;
  64
  65         if ((val & mask) == low_noise_bit)
  66                 return REGULATOR_MODE_NORMAL;
  67
  68         if (!(val & mask))
  69                 return REGULATOR_MODE_IDLE;
  70
  71         return -EINVAL;
  72 }
  73
  74 static const struct regulator_ops as3711_sd_ops = {
  75         .is_enabled             = regulator_is_enabled_regmap,
  76         .enable                 = regulator_enable_regmap,
  77         .disable                = regulator_disable_regmap,
  78         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  79         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  80         .list_voltage           = regulator_list_voltage_linear_range,
  81         .map_voltage            = regulator_map_voltage_linear_range,
  82         .get_mode               = as3711_get_mode_sd,
  83         .set_mode               = as3711_set_mode_sd,
  84 };
  85
  86 static const struct regulator_ops as3711_aldo_ops = {
  87         .is_enabled             = regulator_is_enabled_regmap,
  88         .enable                 = regulator_enable_regmap,
  89         .disable                = regulator_disable_regmap,
  90         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  91         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  92         .list_voltage           = regulator_list_voltage_linear_range,
  93         .map_voltage            = regulator_map_voltage_linear_range,
  94 };
  95
  96 static const struct regulator_ops as3711_dldo_ops = {
  97         .is_enabled             = regulator_is_enabled_regmap,
  98         .enable                 = regulator_enable_regmap,
  99         .disable                = regulator_disable_regmap,
 100         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 101         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 102         .list_voltage           = regulator_list_voltage_linear_range,
 103         .map_voltage            = regulator_map_voltage_linear_range,
 104 };
 105
 106 static const struct regulator_linear_range as3711_sd_ranges[] = {
 107         REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
 108         REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
 109         REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
 110 };
 111
 112 static const struct regulator_linear_range as3711_aldo_ranges[] = {
 113         REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
 114         REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
 115 };
 116
 117 static const struct regulator_linear_range as3711_dldo_ranges[] = {
 118         REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
 119         REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
 120 };
 121
 122 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx)                    \
 123         [AS3711_REGULATOR_ ## _id] = {                                     \
 124                 .name = "as3711-regulator-" # _id,                         \
 125                 .id = AS3711_REGULATOR_ ## _id,                            \
 126                 .n_voltages = (_vmask + 1),                                \
 127                 .ops = &as3711_ ## _sfx ## _ops,                           \
 128                 .type = REGULATOR_VOLTAGE,                                 \
 129                 .owner = THIS_MODULE,                                      \
 130                 .vsel_reg = AS3711_ ## _id ## _VOLTAGE,                    \
 131                 .vsel_mask = _vmask,                                       \
 132                 .enable_reg = AS3711_ ## _en_reg,                          \
 133                 .enable_mask = BIT(_en_bit),                               \
 134                 .linear_ranges = as3711_ ## _sfx ## _ranges,               \
 135                 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
 136 }
 137
 138 static const struct regulator_desc as3711_reg_desc[] = {
 139         AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
 140         AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
 141         AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
 142         AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
 143         AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
 144         AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
 145         AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
 146         AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
 147         AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
 148         AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
 149         AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
 150         AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
 151         /* StepUp output voltage depends on supplying regulator */
 152 };
 153
 154 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_desc)
 155
 156 static struct of_regulator_match
 157 as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
 158         [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
 159         [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
 160         [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
 161         [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
 162         [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
 163         [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
 164         [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
 165         [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
 166         [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
 167         [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
 168         [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
 169         [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
 170 };
 171
 172 static int as3711_regulator_parse_dt(struct device *dev,
 173                                 struct device_node **of_node, const int count)
 174 {
 175         struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
 176         struct device_node *regulators =
 177                 of_get_child_by_name(dev->parent->of_node, "regulators");
 178         struct of_regulator_match *match;
 179         int ret, i;
 180
 181         if (!regulators) {
 182                 dev_err(dev, "regulator node not found\n");
 183                 return -ENODEV;
 184         }
 185
 186         ret = of_regulator_match(dev->parent, regulators,
 187                                  as3711_regulator_matches, count);
 188         of_node_put(regulators);
 189         if (ret < 0) {
 190                 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
 191                 return ret;
 192         }
 193
 194         for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
 195                 if (match->of_node) {
 196                         pdata->init_data[i] = match->init_data;
 197                         of_node[i] = match->of_node;
 198                 }
 199
 200         return 0;
 201 }
 202
 203 static int as3711_regulator_probe(struct platform_device *pdev)
 204 {
 205         struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
 206         struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
 207         struct regulator_config config = {.dev = &pdev->dev,};
 208         struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
 209         struct regulator_dev *rdev;
 210         int ret;
 211         int id;
 212
 213         if (!pdata) {
 214                 dev_err(&pdev->dev, "No platform data...\n");
 215                 return -ENODEV;
 216         }
 217
 218         if (pdev->dev.parent->of_node) {
 219                 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
 220                 if (ret < 0) {
 221                         dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
 222                         return ret;
 223                 }
 224         }
 225
 226         for (id = 0; id < AS3711_REGULATOR_NUM; id++) {
 227                 config.init_data = pdata->init_data[id];
 228                 config.regmap = as3711->regmap;
 229                 config.of_node = of_node[id];
 230
 231                 rdev = devm_regulator_register(&pdev->dev, &as3711_reg_desc[id],
 232                                                &config);
 233                 if (IS_ERR(rdev)) {
 234                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
 235                                 as3711_reg_desc[id].name);
 236                         return PTR_ERR(rdev);
 237                 }
 238         }
 239
 240         return 0;
 241 }
 242
 243 static struct platform_driver as3711_regulator_driver = {
 244         .driver = {
 245                 .name   = "as3711-regulator",
 246         },
 247         .probe          = as3711_regulator_probe,
 248 };
 249
 250 static int __init as3711_regulator_init(void)
 251 {
 252         return platform_driver_register(&as3711_regulator_driver);
 253 }
 254 subsys_initcall(as3711_regulator_init);
 255
 256 static void __exit as3711_regulator_exit(void)
 257 {
 258         platform_driver_unregister(&as3711_regulator_driver);
 259 }
 260 module_exit(as3711_regulator_exit);
 261
 262 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 263 MODULE_DESCRIPTION("AS3711 regulator driver");
 264 MODULE_ALIAS("platform:as3711-regulator");
 265 MODULE_LICENSE("GPL v2");