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 struct as3711_regulator_info {
  21         struct regulator_desc   desc;
  22 };
  23
  24 struct as3711_regulator {
  25         struct as3711_regulator_info *reg_info;
  26 };
  27
  28 /*
  29  * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
  30  * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
  31  * FAST:        sdX_fast=1
  32  * NORMAL:      low_noise=1
  33  * IDLE:        low_noise=0
  34  */
  35
  36 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
  37 {
  38         unsigned int fast_bit = rdev->desc->enable_mask,
  39                 low_noise_bit = fast_bit << 4;
  40         u8 val;
  41
  42         switch (mode) {
  43         case REGULATOR_MODE_FAST:
  44                 val = fast_bit | low_noise_bit;
  45                 break;
  46         case REGULATOR_MODE_NORMAL:
  47                 val = low_noise_bit;
  48                 break;
  49         case REGULATOR_MODE_IDLE:
  50                 val = 0;
  51                 break;
  52         default:
  53                 return -EINVAL;
  54         }
  55
  56         return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
  57                                   low_noise_bit | fast_bit, val);
  58 }
  59
  60 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
  61 {
  62         unsigned int fast_bit = rdev->desc->enable_mask,
  63                 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
  64         unsigned int val;
  65         int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
  66
  67         if (ret < 0)
  68                 return ret;
  69
  70         if ((val & mask) == mask)
  71                 return REGULATOR_MODE_FAST;
  72
  73         if ((val & mask) == low_noise_bit)
  74                 return REGULATOR_MODE_NORMAL;
  75
  76         if (!(val & mask))
  77                 return REGULATOR_MODE_IDLE;
  78
  79         return -EINVAL;
  80 }
  81
  82 static const struct regulator_ops as3711_sd_ops = {
  83         .is_enabled             = regulator_is_enabled_regmap,
  84         .enable                 = regulator_enable_regmap,
  85         .disable                = regulator_disable_regmap,
  86         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  87         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  88         .list_voltage           = regulator_list_voltage_linear_range,
  89         .map_voltage            = regulator_map_voltage_linear_range,
  90         .get_mode               = as3711_get_mode_sd,
  91         .set_mode               = as3711_set_mode_sd,
  92 };
  93
  94 static const struct regulator_ops as3711_aldo_ops = {
  95         .is_enabled             = regulator_is_enabled_regmap,
  96         .enable                 = regulator_enable_regmap,
  97         .disable                = regulator_disable_regmap,
  98         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  99         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 100         .list_voltage           = regulator_list_voltage_linear_range,
 101         .map_voltage            = regulator_map_voltage_linear_range,
 102 };
 103
 104 static const struct regulator_ops as3711_dldo_ops = {
 105         .is_enabled             = regulator_is_enabled_regmap,
 106         .enable                 = regulator_enable_regmap,
 107         .disable                = regulator_disable_regmap,
 108         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 109         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 110         .list_voltage           = regulator_list_voltage_linear_range,
 111         .map_voltage            = regulator_map_voltage_linear_range,
 112 };
 113
 114 static const struct regulator_linear_range as3711_sd_ranges[] = {
 115         REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
 116         REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
 117         REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
 118 };
 119
 120 static const struct regulator_linear_range as3711_aldo_ranges[] = {
 121         REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
 122         REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
 123 };
 124
 125 static const struct regulator_linear_range as3711_dldo_ranges[] = {
 126         REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
 127         REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
 128 };
 129
 130 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx)                    \
 131         [AS3711_REGULATOR_ ## _id] = {                                     \
 132         .desc = {                                                          \
 133                 .name = "as3711-regulator-" # _id,                         \
 134                 .id = AS3711_REGULATOR_ ## _id,                            \
 135                 .n_voltages = (_vmask + 1),                                \
 136                 .ops = &as3711_ ## _sfx ## _ops,                           \
 137                 .type = REGULATOR_VOLTAGE,                                 \
 138                 .owner = THIS_MODULE,                                      \
 139                 .vsel_reg = AS3711_ ## _id ## _VOLTAGE,                    \
 140                 .vsel_mask = _vmask,                                       \
 141                 .enable_reg = AS3711_ ## _en_reg,                          \
 142                 .enable_mask = BIT(_en_bit),                               \
 143                 .linear_ranges = as3711_ ## _sfx ## _ranges,               \
 144                 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
 145         },                                                                 \
 146 }
 147
 148 static struct as3711_regulator_info as3711_reg_info[] = {
 149         AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
 150         AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
 151         AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
 152         AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
 153         AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
 154         AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
 155         AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
 156         AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
 157         AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
 158         AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
 159         AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
 160         AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
 161         /* StepUp output voltage depends on supplying regulator */
 162 };
 163
 164 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
 165
 166 static struct of_regulator_match
 167 as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
 168         [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
 169         [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
 170         [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
 171         [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
 172         [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
 173         [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
 174         [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
 175         [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
 176         [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
 177         [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
 178         [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
 179         [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
 180 };
 181
 182 static int as3711_regulator_parse_dt(struct device *dev,
 183                                 struct device_node **of_node, const int count)
 184 {
 185         struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
 186         struct device_node *regulators =
 187                 of_get_child_by_name(dev->parent->of_node, "regulators");
 188         struct of_regulator_match *match;
 189         int ret, i;
 190
 191         if (!regulators) {
 192                 dev_err(dev, "regulator node not found\n");
 193                 return -ENODEV;
 194         }
 195
 196         ret = of_regulator_match(dev->parent, regulators,
 197                                  as3711_regulator_matches, count);
 198         of_node_put(regulators);
 199         if (ret < 0) {
 200                 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
 201                 return ret;
 202         }
 203
 204         for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
 205                 if (match->of_node) {
 206                         pdata->init_data[i] = match->init_data;
 207                         of_node[i] = match->of_node;
 208                 }
 209
 210         return 0;
 211 }
 212
 213 static int as3711_regulator_probe(struct platform_device *pdev)
 214 {
 215         struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
 216         struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
 217         struct regulator_config config = {.dev = &pdev->dev,};
 218         struct as3711_regulator *reg = NULL;
 219         struct as3711_regulator *regs;
 220         struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
 221         struct regulator_dev *rdev;
 222         struct as3711_regulator_info *ri;
 223         int ret;
 224         int id;
 225
 226         if (!pdata) {
 227                 dev_err(&pdev->dev, "No platform data...\n");
 228                 return -ENODEV;
 229         }
 230
 231         if (pdev->dev.parent->of_node) {
 232                 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
 233                 if (ret < 0) {
 234                         dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
 235                         return ret;
 236                 }
 237         }
 238
 239         regs = devm_kcalloc(&pdev->dev,
 240                             AS3711_REGULATOR_NUM,
 241                             sizeof(struct as3711_regulator),
 242                             GFP_KERNEL);
 243         if (!regs)
 244                 return -ENOMEM;
 245
 246         for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
 247                 reg = &regs[id];
 248                 reg->reg_info = ri;
 249
 250                 config.init_data = pdata->init_data[id];
 251                 config.driver_data = reg;
 252                 config.regmap = as3711->regmap;
 253                 config.of_node = of_node[id];
 254
 255                 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
 256                 if (IS_ERR(rdev)) {
 257                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
 258                                 ri->desc.name);
 259                         return PTR_ERR(rdev);
 260                 }
 261         }
 262         platform_set_drvdata(pdev, regs);
 263         return 0;
 264 }
 265
 266 static struct platform_driver as3711_regulator_driver = {
 267         .driver = {
 268                 .name   = "as3711-regulator",
 269         },
 270         .probe          = as3711_regulator_probe,
 271 };
 272
 273 static int __init as3711_regulator_init(void)
 274 {
 275         return platform_driver_register(&as3711_regulator_driver);
 276 }
 277 subsys_initcall(as3711_regulator_init);
 278
 279 static void __exit as3711_regulator_exit(void)
 280 {
 281         platform_driver_unregister(&as3711_regulator_driver);
 282 }
 283 module_exit(as3711_regulator_exit);
 284
 285 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 286 MODULE_DESCRIPTION("AS3711 regulator driver");
 287 MODULE_ALIAS("platform:as3711-regulator");
 288 MODULE_LICENSE("GPL v2");