kernel/drivers/regulator/rk808-regulator.c

   1 /*
   2  * Regulator driver for Rockchip RK808
   3  *
   4  * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
   5  *
   6  * Author: Chris Zhong <zyw@rock-chips.com>
   7  * Author: Zhang Qing <zhangqing@rock-chips.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms and conditions of the GNU General Public License,
  11  * version 2, as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * more details.
  17  */
  18
  19 #include <linux/delay.h>
  20 #include <linux/gpio.h>
  21 #include <linux/i2c.h>
  22 #include <linux/module.h>
  23 #include <linux/of_device.h>
  24 #include <linux/of_gpio.h>
  25 #include <linux/mfd/rk808.h>
  26 #include <linux/regulator/driver.h>
  27 #include <linux/regulator/of_regulator.h>
  28 #include <linux/gpio/consumer.h>
  29
  30 /* Field Definitions */
  31 #define RK808_BUCK_VSEL_MASK    0x3f
  32 #define RK808_BUCK4_VSEL_MASK   0xf
  33 #define RK808_LDO_VSEL_MASK     0x1f
  34
  35 /* Ramp rate definitions for buck1 / buck2 only */
  36 #define RK808_RAMP_RATE_OFFSET          3
  37 #define RK808_RAMP_RATE_MASK            (3 << RK808_RAMP_RATE_OFFSET)
  38 #define RK808_RAMP_RATE_2MV_PER_US      (0 << RK808_RAMP_RATE_OFFSET)
  39 #define RK808_RAMP_RATE_4MV_PER_US      (1 << RK808_RAMP_RATE_OFFSET)
  40 #define RK808_RAMP_RATE_6MV_PER_US      (2 << RK808_RAMP_RATE_OFFSET)
  41 #define RK808_RAMP_RATE_10MV_PER_US     (3 << RK808_RAMP_RATE_OFFSET)
  42
  43 #define RK808_DVS2_POL          BIT(2)
  44 #define RK808_DVS1_POL          BIT(1)
  45
  46 /* Offset from XXX_ON_VSEL to XXX_SLP_VSEL */
  47 #define RK808_SLP_REG_OFFSET 1
  48
  49 /* Offset from XXX_ON_VSEL to XXX_DVS_VSEL */
  50 #define RK808_DVS_REG_OFFSET 2
  51
  52 /* Offset from XXX_EN_REG to SLEEP_SET_OFF_XXX */
  53 #define RK808_SLP_SET_OFF_REG_OFFSET 2
  54
  55 /* max steps for increase voltage of Buck1/2, equal 100mv*/
  56 #define MAX_STEPS_ONE_TIME 8
  57
  58 struct rk808_regulator_data {
  59         struct gpio_desc *dvs_gpio[2];
  60 };
  61
  62 static const int rk808_buck_config_regs[] = {
  63         RK808_BUCK1_CONFIG_REG,
  64         RK808_BUCK2_CONFIG_REG,
  65         RK808_BUCK3_CONFIG_REG,
  66         RK808_BUCK4_CONFIG_REG,
  67 };
  68
  69 static const struct regulator_linear_range rk808_buck_voltage_ranges[] = {
  70         REGULATOR_LINEAR_RANGE(712500, 0, 63, 12500),
  71 };
  72
  73 static const struct regulator_linear_range rk808_buck4_voltage_ranges[] = {
  74         REGULATOR_LINEAR_RANGE(1800000, 0, 15, 100000),
  75 };
  76
  77 static const struct regulator_linear_range rk808_ldo_voltage_ranges[] = {
  78         REGULATOR_LINEAR_RANGE(1800000, 0, 16, 100000),
  79 };
  80
  81 static const struct regulator_linear_range rk808_ldo3_voltage_ranges[] = {
  82         REGULATOR_LINEAR_RANGE(800000, 0, 13, 100000),
  83         REGULATOR_LINEAR_RANGE(2500000, 15, 15, 0),
  84 };
  85
  86 static const struct regulator_linear_range rk808_ldo6_voltage_ranges[] = {
  87         REGULATOR_LINEAR_RANGE(800000, 0, 17, 100000),
  88 };
  89
  90 static int rk808_buck1_2_get_voltage_sel_regmap(struct regulator_dev *rdev)
  91 {
  92         struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
  93         int id = rdev->desc->id - RK808_ID_DCDC1;
  94         struct gpio_desc *gpio = pdata->dvs_gpio[id];
  95         unsigned int val;
  96         int ret;
  97
  98         if (!gpio || gpiod_get_value(gpio) == 0)
  99                 return regulator_get_voltage_sel_regmap(rdev);
 100
 101         ret = regmap_read(rdev->regmap,
 102                           rdev->desc->vsel_reg + RK808_DVS_REG_OFFSET,
 103                           &val);
 104         if (ret != 0)
 105                 return ret;
 106
 107         val &= rdev->desc->vsel_mask;
 108         val >>= ffs(rdev->desc->vsel_mask) - 1;
 109
 110         return val;
 111 }
 112
 113 static int rk808_buck1_2_i2c_set_voltage_sel(struct regulator_dev *rdev,
 114                                              unsigned sel)
 115 {
 116         int ret, delta_sel;
 117         unsigned int old_sel, tmp, val, mask = rdev->desc->vsel_mask;
 118
 119         ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
 120         if (ret != 0)
 121                 return ret;
 122
 123         tmp = val & ~mask;
 124         old_sel = val & mask;
 125         old_sel >>= ffs(mask) - 1;
 126         delta_sel = sel - old_sel;
 127
 128         /*
 129          * If directly modify the register to change the voltage, we will face
 130          * the risk of overshoot. Put it into a multi-step, can effectively
 131          * avoid this problem, a step is 100mv here.
 132          */
 133         while (delta_sel > MAX_STEPS_ONE_TIME) {
 134                 old_sel += MAX_STEPS_ONE_TIME;
 135                 val = old_sel << (ffs(mask) - 1);
 136                 val |= tmp;
 137
 138                 /*
 139                  * i2c is 400kHz (2.5us per bit) and we must transmit _at least_
 140                  * 3 bytes (24 bits) plus start and stop so 26 bits.  So we've
 141                  * got more than 65 us between each voltage change and thus
 142                  * won't ramp faster than ~1500 uV / us.
 143                  */
 144                 ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, val);
 145                 delta_sel = sel - old_sel;
 146         }
 147
 148         sel <<= ffs(mask) - 1;
 149         val = tmp | sel;
 150         ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, val);
 151
 152         /*
 153          * When we change the voltage register directly, the ramp rate is about
 154          * 100000uv/us, wait 1us to make sure the target voltage to be stable,
 155          * so we needn't wait extra time after that.
 156          */
 157         udelay(1);
 158
 159         return ret;
 160 }
 161
 162 static int rk808_buck1_2_set_voltage_sel(struct regulator_dev *rdev,
 163                                          unsigned sel)
 164 {
 165         struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
 166         int id = rdev->desc->id - RK808_ID_DCDC1;
 167         struct gpio_desc *gpio = pdata->dvs_gpio[id];
 168         unsigned int reg = rdev->desc->vsel_reg;
 169         unsigned old_sel;
 170         int ret, gpio_level;
 171
 172         if (!gpio)
 173                 return rk808_buck1_2_i2c_set_voltage_sel(rdev, sel);
 174
 175         gpio_level = gpiod_get_value(gpio);
 176         if (gpio_level == 0) {
 177                 reg += RK808_DVS_REG_OFFSET;
 178                 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &old_sel);
 179         } else {
 180                 ret = regmap_read(rdev->regmap,
 181                                   reg + RK808_DVS_REG_OFFSET,
 182                                   &old_sel);
 183         }
 184
 185         if (ret != 0)
 186                 return ret;
 187
 188         sel <<= ffs(rdev->desc->vsel_mask) - 1;
 189         sel |= old_sel & ~rdev->desc->vsel_mask;
 190
 191         ret = regmap_write(rdev->regmap, reg, sel);
 192         if (ret)
 193                 return ret;
 194
 195         gpiod_set_value(gpio, !gpio_level);
 196
 197         return ret;
 198 }
 199
 200 static int rk808_buck1_2_set_voltage_time_sel(struct regulator_dev *rdev,
 201                                        unsigned int old_selector,
 202                                        unsigned int new_selector)
 203 {
 204         struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
 205         int id = rdev->desc->id - RK808_ID_DCDC1;
 206         struct gpio_desc *gpio = pdata->dvs_gpio[id];
 207
 208         /* if there is no dvs1/2 pin, we don't need wait extra time here. */
 209         if (!gpio)
 210                 return 0;
 211
 212         return regulator_set_voltage_time_sel(rdev, old_selector, new_selector);
 213 }
 214
 215 static int rk808_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 216 {
 217         unsigned int ramp_value = RK808_RAMP_RATE_10MV_PER_US;
 218         unsigned int reg = rk808_buck_config_regs[rdev->desc->id -
 219                                                   RK808_ID_DCDC1];
 220
 221         switch (ramp_delay) {
 222         case 1 ... 2000:
 223                 ramp_value = RK808_RAMP_RATE_2MV_PER_US;
 224                 break;
 225         case 2001 ... 4000:
 226                 ramp_value = RK808_RAMP_RATE_4MV_PER_US;
 227                 break;
 228         case 4001 ... 6000:
 229                 ramp_value = RK808_RAMP_RATE_6MV_PER_US;
 230                 break;
 231         case 6001 ... 10000:
 232                 break;
 233         default:
 234                 pr_warn("%s ramp_delay: %d not supported, setting 10000\n",
 235                         rdev->desc->name, ramp_delay);
 236         }
 237
 238         return regmap_update_bits(rdev->regmap, reg,
 239                                   RK808_RAMP_RATE_MASK, ramp_value);
 240 }
 241
 242 static int rk808_set_suspend_voltage(struct regulator_dev *rdev, int uv)
 243 {
 244         unsigned int reg;
 245         int sel = regulator_map_voltage_linear_range(rdev, uv, uv);
 246
 247         if (sel < 0)
 248                 return -EINVAL;
 249
 250         reg = rdev->desc->vsel_reg + RK808_SLP_REG_OFFSET;
 251
 252         return regmap_update_bits(rdev->regmap, reg,
 253                                   rdev->desc->vsel_mask,
 254                                   sel);
 255 }
 256
 257 static int rk808_set_suspend_enable(struct regulator_dev *rdev)
 258 {
 259         unsigned int reg;
 260
 261         reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET;
 262
 263         return regmap_update_bits(rdev->regmap, reg,
 264                                   rdev->desc->enable_mask,
 265                                   0);
 266 }
 267
 268 static int rk808_set_suspend_disable(struct regulator_dev *rdev)
 269 {
 270         unsigned int reg;
 271
 272         reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET;
 273
 274         return regmap_update_bits(rdev->regmap, reg,
 275                                   rdev->desc->enable_mask,
 276                                   rdev->desc->enable_mask);
 277 }
 278
 279 static struct regulator_ops rk808_buck1_2_ops = {
 280         .list_voltage           = regulator_list_voltage_linear_range,
 281         .map_voltage            = regulator_map_voltage_linear_range,
 282         .get_voltage_sel        = rk808_buck1_2_get_voltage_sel_regmap,
 283         .set_voltage_sel        = rk808_buck1_2_set_voltage_sel,
 284         .set_voltage_time_sel   = rk808_buck1_2_set_voltage_time_sel,
 285         .enable                 = regulator_enable_regmap,
 286         .disable                = regulator_disable_regmap,
 287         .is_enabled             = regulator_is_enabled_regmap,
 288         .set_ramp_delay         = rk808_set_ramp_delay,
 289         .set_suspend_voltage    = rk808_set_suspend_voltage,
 290         .set_suspend_enable     = rk808_set_suspend_enable,
 291         .set_suspend_disable    = rk808_set_suspend_disable,
 292 };
 293
 294 static struct regulator_ops rk808_reg_ops = {
 295         .list_voltage           = regulator_list_voltage_linear_range,
 296         .map_voltage            = regulator_map_voltage_linear_range,
 297         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 298         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 299         .enable                 = regulator_enable_regmap,
 300         .disable                = regulator_disable_regmap,
 301         .is_enabled             = regulator_is_enabled_regmap,
 302         .set_suspend_voltage    = rk808_set_suspend_voltage,
 303         .set_suspend_enable     = rk808_set_suspend_enable,
 304         .set_suspend_disable    = rk808_set_suspend_disable,
 305 };
 306
 307 static struct regulator_ops rk808_switch_ops = {
 308         .enable                 = regulator_enable_regmap,
 309         .disable                = regulator_disable_regmap,
 310         .is_enabled             = regulator_is_enabled_regmap,
 311         .set_suspend_enable     = rk808_set_suspend_enable,
 312         .set_suspend_disable    = rk808_set_suspend_disable,
 313 };
 314
 315 static const struct regulator_desc rk808_reg[] = {
 316         {
 317                 .name = "DCDC_REG1",
 318                 .supply_name = "vcc1",
 319                 .id = RK808_ID_DCDC1,
 320                 .ops = &rk808_buck1_2_ops,
 321                 .type = REGULATOR_VOLTAGE,
 322                 .n_voltages = 64,
 323                 .linear_ranges = rk808_buck_voltage_ranges,
 324                 .n_linear_ranges = ARRAY_SIZE(rk808_buck_voltage_ranges),
 325                 .vsel_reg = RK808_BUCK1_ON_VSEL_REG,
 326                 .vsel_mask = RK808_BUCK_VSEL_MASK,
 327                 .enable_reg = RK808_DCDC_EN_REG,
 328                 .enable_mask = BIT(0),
 329                 .owner = THIS_MODULE,
 330         }, {
 331                 .name = "DCDC_REG2",
 332                 .supply_name = "vcc2",
 333                 .id = RK808_ID_DCDC2,
 334                 .ops = &rk808_buck1_2_ops,
 335                 .type = REGULATOR_VOLTAGE,
 336                 .n_voltages = 64,
 337                 .linear_ranges = rk808_buck_voltage_ranges,
 338                 .n_linear_ranges = ARRAY_SIZE(rk808_buck_voltage_ranges),
 339                 .vsel_reg = RK808_BUCK2_ON_VSEL_REG,
 340                 .vsel_mask = RK808_BUCK_VSEL_MASK,
 341                 .enable_reg = RK808_DCDC_EN_REG,
 342                 .enable_mask = BIT(1),
 343                 .owner = THIS_MODULE,
 344         }, {
 345                 .name = "DCDC_REG3",
 346                 .supply_name = "vcc3",
 347                 .id = RK808_ID_DCDC3,
 348                 .ops = &rk808_switch_ops,
 349                 .type = REGULATOR_VOLTAGE,
 350                 .n_voltages = 1,
 351                 .enable_reg = RK808_DCDC_EN_REG,
 352                 .enable_mask = BIT(2),
 353                 .owner = THIS_MODULE,
 354         }, {
 355                 .name = "DCDC_REG4",
 356                 .supply_name = "vcc4",
 357                 .id = RK808_ID_DCDC4,
 358                 .ops = &rk808_reg_ops,
 359                 .type = REGULATOR_VOLTAGE,
 360                 .n_voltages = 16,
 361                 .linear_ranges = rk808_buck4_voltage_ranges,
 362                 .n_linear_ranges = ARRAY_SIZE(rk808_buck4_voltage_ranges),
 363                 .vsel_reg = RK808_BUCK4_ON_VSEL_REG,
 364                 .vsel_mask = RK808_BUCK4_VSEL_MASK,
 365                 .enable_reg = RK808_DCDC_EN_REG,
 366                 .enable_mask = BIT(3),
 367                 .owner = THIS_MODULE,
 368         }, {
 369                 .name = "LDO_REG1",
 370                 .supply_name = "vcc6",
 371                 .id = RK808_ID_LDO1,
 372                 .ops = &rk808_reg_ops,
 373                 .type = REGULATOR_VOLTAGE,
 374                 .n_voltages = 17,
 375                 .linear_ranges = rk808_ldo_voltage_ranges,
 376                 .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
 377                 .vsel_reg = RK808_LDO1_ON_VSEL_REG,
 378                 .vsel_mask = RK808_LDO_VSEL_MASK,
 379                 .enable_reg = RK808_LDO_EN_REG,
 380                 .enable_mask = BIT(0),
 381                 .enable_time = 400,
 382                 .owner = THIS_MODULE,
 383         }, {
 384                 .name = "LDO_REG2",
 385                 .supply_name = "vcc6",
 386                 .id = RK808_ID_LDO2,
 387                 .ops = &rk808_reg_ops,
 388                 .type = REGULATOR_VOLTAGE,
 389                 .n_voltages = 17,
 390                 .linear_ranges = rk808_ldo_voltage_ranges,
 391                 .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
 392                 .vsel_reg = RK808_LDO2_ON_VSEL_REG,
 393                 .vsel_mask = RK808_LDO_VSEL_MASK,
 394                 .enable_reg = RK808_LDO_EN_REG,
 395                 .enable_mask = BIT(1),
 396                 .enable_time = 400,
 397                 .owner = THIS_MODULE,
 398         }, {
 399                 .name = "LDO_REG3",
 400                 .supply_name = "vcc7",
 401                 .id = RK808_ID_LDO3,
 402                 .ops = &rk808_reg_ops,
 403                 .type = REGULATOR_VOLTAGE,
 404                 .n_voltages = 16,
 405                 .linear_ranges = rk808_ldo3_voltage_ranges,
 406                 .n_linear_ranges = ARRAY_SIZE(rk808_ldo3_voltage_ranges),
 407                 .vsel_reg = RK808_LDO3_ON_VSEL_REG,
 408                 .vsel_mask = RK808_BUCK4_VSEL_MASK,
 409                 .enable_reg = RK808_LDO_EN_REG,
 410                 .enable_mask = BIT(2),
 411                 .enable_time = 400,
 412                 .owner = THIS_MODULE,
 413         }, {
 414                 .name = "LDO_REG4",
 415                 .supply_name = "vcc9",
 416                 .id = RK808_ID_LDO4,
 417                 .ops = &rk808_reg_ops,
 418                 .type = REGULATOR_VOLTAGE,
 419                 .n_voltages = 17,
 420                 .linear_ranges = rk808_ldo_voltage_ranges,
 421                 .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
 422                 .vsel_reg = RK808_LDO4_ON_VSEL_REG,
 423                 .vsel_mask = RK808_LDO_VSEL_MASK,
 424                 .enable_reg = RK808_LDO_EN_REG,
 425                 .enable_mask = BIT(3),
 426                 .enable_time = 400,
 427                 .owner = THIS_MODULE,
 428         }, {
 429                 .name = "LDO_REG5",
 430                 .supply_name = "vcc9",
 431                 .id = RK808_ID_LDO5,
 432                 .ops = &rk808_reg_ops,
 433                 .type = REGULATOR_VOLTAGE,
 434                 .n_voltages = 17,
 435                 .linear_ranges = rk808_ldo_voltage_ranges,
 436                 .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
 437                 .vsel_reg = RK808_LDO5_ON_VSEL_REG,
 438                 .vsel_mask = RK808_LDO_VSEL_MASK,
 439                 .enable_reg = RK808_LDO_EN_REG,
 440                 .enable_mask = BIT(4),
 441                 .enable_time = 400,
 442                 .owner = THIS_MODULE,
 443         }, {
 444                 .name = "LDO_REG6",
 445                 .supply_name = "vcc10",
 446                 .id = RK808_ID_LDO6,
 447                 .ops = &rk808_reg_ops,
 448                 .type = REGULATOR_VOLTAGE,
 449                 .n_voltages = 18,
 450                 .linear_ranges = rk808_ldo6_voltage_ranges,
 451                 .n_linear_ranges = ARRAY_SIZE(rk808_ldo6_voltage_ranges),
 452                 .vsel_reg = RK808_LDO6_ON_VSEL_REG,
 453                 .vsel_mask = RK808_LDO_VSEL_MASK,
 454                 .enable_reg = RK808_LDO_EN_REG,
 455                 .enable_mask = BIT(5),
 456                 .enable_time = 400,
 457                 .owner = THIS_MODULE,
 458         }, {
 459                 .name = "LDO_REG7",
 460                 .supply_name = "vcc7",
 461                 .id = RK808_ID_LDO7,
 462                 .ops = &rk808_reg_ops,
 463                 .type = REGULATOR_VOLTAGE,
 464                 .n_voltages = 18,
 465                 .linear_ranges = rk808_ldo6_voltage_ranges,
 466                 .n_linear_ranges = ARRAY_SIZE(rk808_ldo6_voltage_ranges),
 467                 .vsel_reg = RK808_LDO7_ON_VSEL_REG,
 468                 .vsel_mask = RK808_LDO_VSEL_MASK,
 469                 .enable_reg = RK808_LDO_EN_REG,
 470                 .enable_mask = BIT(6),
 471                 .enable_time = 400,
 472                 .owner = THIS_MODULE,
 473         }, {
 474                 .name = "LDO_REG8",
 475                 .supply_name = "vcc11",
 476                 .id = RK808_ID_LDO8,
 477                 .ops = &rk808_reg_ops,
 478                 .type = REGULATOR_VOLTAGE,
 479                 .n_voltages = 17,
 480                 .linear_ranges = rk808_ldo_voltage_ranges,
 481                 .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
 482                 .vsel_reg = RK808_LDO8_ON_VSEL_REG,
 483                 .vsel_mask = RK808_LDO_VSEL_MASK,
 484                 .enable_reg = RK808_LDO_EN_REG,
 485                 .enable_mask = BIT(7),
 486                 .enable_time = 400,
 487                 .owner = THIS_MODULE,
 488         }, {
 489                 .name = "SWITCH_REG1",
 490                 .supply_name = "vcc8",
 491                 .id = RK808_ID_SWITCH1,
 492                 .ops = &rk808_switch_ops,
 493                 .type = REGULATOR_VOLTAGE,
 494                 .enable_reg = RK808_DCDC_EN_REG,
 495                 .enable_mask = BIT(5),
 496                 .owner = THIS_MODULE,
 497         }, {
 498                 .name = "SWITCH_REG2",
 499                 .supply_name = "vcc12",
 500                 .id = RK808_ID_SWITCH2,
 501                 .ops = &rk808_switch_ops,
 502                 .type = REGULATOR_VOLTAGE,
 503                 .enable_reg = RK808_DCDC_EN_REG,
 504                 .enable_mask = BIT(6),
 505                 .owner = THIS_MODULE,
 506         },
 507 };
 508
 509 static struct of_regulator_match rk808_reg_matches[] = {
 510         [RK808_ID_DCDC1]        = { .name = "DCDC_REG1" },
 511         [RK808_ID_DCDC2]        = { .name = "DCDC_REG2" },
 512         [RK808_ID_DCDC3]        = { .name = "DCDC_REG3" },
 513         [RK808_ID_DCDC4]        = { .name = "DCDC_REG4" },
 514         [RK808_ID_LDO1]         = { .name = "LDO_REG1" },
 515         [RK808_ID_LDO2]         = { .name = "LDO_REG2" },
 516         [RK808_ID_LDO3]         = { .name = "LDO_REG3" },
 517         [RK808_ID_LDO4]         = { .name = "LDO_REG4" },
 518         [RK808_ID_LDO5]         = { .name = "LDO_REG5" },
 519         [RK808_ID_LDO6]         = { .name = "LDO_REG6" },
 520         [RK808_ID_LDO7]         = { .name = "LDO_REG7" },
 521         [RK808_ID_LDO8]         = { .name = "LDO_REG8" },
 522         [RK808_ID_SWITCH1]      = { .name = "SWITCH_REG1" },
 523         [RK808_ID_SWITCH2]      = { .name = "SWITCH_REG2" },
 524 };
 525
 526 static int rk808_regulator_dt_parse_pdata(struct device *dev,
 527                                    struct device *client_dev,
 528                                    struct regmap *map,
 529                                    struct rk808_regulator_data *pdata)
 530 {
 531         struct device_node *np;
 532         int tmp, ret, i;
 533
 534         np = of_get_child_by_name(client_dev->of_node, "regulators");
 535         if (!np)
 536                 return -ENXIO;
 537
 538         ret = of_regulator_match(dev, np, rk808_reg_matches,
 539                                  RK808_NUM_REGULATORS);
 540         if (ret < 0)
 541                 goto dt_parse_end;
 542
 543         for (i = 0; i < ARRAY_SIZE(pdata->dvs_gpio); i++) {
 544                 pdata->dvs_gpio[i] =
 545                         devm_gpiod_get_index_optional(client_dev, "dvs", i,
 546                                                       GPIOD_OUT_LOW);
 547                 if (IS_ERR(pdata->dvs_gpio[i])) {
 548                         ret = PTR_ERR(pdata->dvs_gpio[i]);
 549                         dev_err(dev, "failed to get dvs%d gpio (%d)\n", i, ret);
 550                         goto dt_parse_end;
 551                 }
 552
 553                 if (!pdata->dvs_gpio[i]) {
 554                         dev_warn(dev, "there is no dvs%d gpio\n", i);
 555                         continue;
 556                 }
 557
 558                 tmp = i ? RK808_DVS2_POL : RK808_DVS1_POL;
 559                 ret = regmap_update_bits(map, RK808_IO_POL_REG, tmp,
 560                                 gpiod_is_active_low(pdata->dvs_gpio[i]) ?
 561                                 0 : tmp);
 562         }
 563
 564 dt_parse_end:
 565         of_node_put(np);
 566         return ret;
 567 }
 568
 569 static int rk808_regulator_probe(struct platform_device *pdev)
 570 {
 571         struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
 572         struct i2c_client *client = rk808->i2c;
 573         struct regulator_config config = {};
 574         struct regulator_dev *rk808_rdev;
 575         struct rk808_regulator_data *pdata;
 576         int ret, i;
 577
 578         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 579         if (!pdata)
 580                 return -ENOMEM;
 581
 582         ret = rk808_regulator_dt_parse_pdata(&pdev->dev, &client->dev,
 583                                              rk808->regmap, pdata);
 584         if (ret < 0)
 585                 return ret;
 586
 587         platform_set_drvdata(pdev, pdata);
 588
 589         /* Instantiate the regulators */
 590         for (i = 0; i < RK808_NUM_REGULATORS; i++) {
 591                 if (!rk808_reg_matches[i].init_data ||
 592                     !rk808_reg_matches[i].of_node)
 593                         continue;
 594
 595                 config.dev = &client->dev;
 596                 config.driver_data = pdata;
 597                 config.regmap = rk808->regmap;
 598                 config.of_node = rk808_reg_matches[i].of_node;
 599                 config.init_data = rk808_reg_matches[i].init_data;
 600
 601                 rk808_rdev = devm_regulator_register(&pdev->dev,
 602                                                      &rk808_reg[i], &config);
 603                 if (IS_ERR(rk808_rdev)) {
 604                         dev_err(&client->dev,
 605                                 "failed to register %d regulator\n", i);
 606                         return PTR_ERR(rk808_rdev);
 607                 }
 608         }
 609
 610         return 0;
 611 }
 612
 613 static struct platform_driver rk808_regulator_driver = {
 614         .probe = rk808_regulator_probe,
 615         .driver = {
 616                 .name = "rk808-regulator",
 617                 .owner = THIS_MODULE,
 618         },
 619 };
 620
 621 module_platform_driver(rk808_regulator_driver);
 622
 623 MODULE_DESCRIPTION("regulator driver for the rk808 series PMICs");
 624 MODULE_AUTHOR("Chris Zhong<zyw@rock-chips.com>");
 625 MODULE_AUTHOR("Zhang Qing<zhangqing@rock-chips.com>");
 626 MODULE_LICENSE("GPL");
 627 MODULE_ALIAS("platform:rk808-regulator");