drivers/regulator/max77802.c

   1 /*
   2  * max77802.c - Regulator driver for the Maxim 77802
   3  *
   4  * Copyright (C) 2013-2014 Google, Inc
   5  * Simon Glass <sjg@chromium.org>
   6  *
   7  * Copyright (C) 2012 Samsung Electronics
   8  * Chiwoong Byun <woong.byun@smasung.com>
   9  * Jonghwa Lee <jonghwa3.lee@samsung.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * This driver is based on max8997.c
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/bug.h>
  26 #include <linux/err.h>
  27 #include <linux/gpio.h>
  28 #include <linux/slab.h>
  29 #include <linux/gpio/consumer.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/regulator/driver.h>
  32 #include <linux/regulator/machine.h>
  33 #include <linux/regulator/of_regulator.h>
  34 #include <linux/mfd/max77686.h>
  35 #include <linux/mfd/max77686-private.h>
  36
  37 /* Default ramp delay in case it is not manually set */
  38 #define MAX77802_RAMP_DELAY             100000          /* uV/us */
  39
  40 #define MAX77802_OPMODE_SHIFT_LDO       6
  41 #define MAX77802_OPMODE_BUCK234_SHIFT   4
  42 #define MAX77802_OPMODE_MASK            0x3
  43
  44 #define MAX77802_VSEL_MASK              0x3F
  45 #define MAX77802_DVS_VSEL_MASK          0xFF
  46
  47 #define MAX77802_RAMP_RATE_MASK_2BIT    0xC0
  48 #define MAX77802_RAMP_RATE_SHIFT_2BIT   6
  49 #define MAX77802_RAMP_RATE_MASK_4BIT    0xF0
  50 #define MAX77802_RAMP_RATE_SHIFT_4BIT   4
  51
  52 /* MAX77802 has two register formats: 2-bit and 4-bit */
  53 static const unsigned int ramp_table_77802_2bit[] = {
  54         12500,
  55         25000,
  56         50000,
  57         100000,
  58 };
  59
  60 static unsigned int ramp_table_77802_4bit[] = {
  61         1000,   2000,   3030,   4000,
  62         5000,   5880,   7140,   8330,
  63         9090,   10000,  11110,  12500,
  64         16670,  25000,  50000,  100000,
  65 };
  66
  67 struct max77802_regulator_prv {
  68         unsigned int opmode[MAX77802_REG_MAX];
  69 };
  70
  71 static int max77802_get_opmode_shift(int id)
  72 {
  73         if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
  74                                      id <= MAX77802_BUCK10))
  75                 return 0;
  76
  77         if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
  78                 return MAX77802_OPMODE_BUCK234_SHIFT;
  79
  80         if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
  81                 return MAX77802_OPMODE_SHIFT_LDO;
  82
  83         return -EINVAL;
  84 }
  85
  86 /*
  87  * Some BUCKS supports Normal[ON/OFF] mode during suspend
  88  *
  89  * BUCK 1, 6, 2-4, 5, 7-10 (all)
  90  *
  91  * The other mode (0x02) will make PWRREQ switch between normal
  92  * and low power.
  93  */
  94 static int max77802_buck_set_suspend_disable(struct regulator_dev *rdev)
  95 {
  96         unsigned int val = MAX77802_OPMODE_STANDBY;
  97         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
  98         int id = rdev_get_id(rdev);
  99         int shift = max77802_get_opmode_shift(id);
 100
 101         max77802->opmode[id] = val;
 102         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 103                                   rdev->desc->enable_mask, val << shift);
 104 }
 105
 106 /*
 107  * Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state
 108  * (Enable Control Logic1 by PWRREQ)
 109  *
 110  * LDOs 2, 4-19, 22-35.
 111  *
 112  */
 113 static int max77802_ldo_set_suspend_mode_logic1(struct regulator_dev *rdev,
 114                                                 unsigned int mode)
 115 {
 116         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 117         int id = rdev_get_id(rdev);
 118         unsigned int val;
 119         int shift = max77802_get_opmode_shift(id);
 120
 121         switch (mode) {
 122         case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 123                 val = MAX77802_OPMODE_LP;
 124                 break;
 125         case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 126                 val = MAX77802_OPMODE_NORMAL;
 127                 break;
 128         case REGULATOR_MODE_STANDBY:                    /* ON/OFF by PWRREQ */
 129                 val = MAX77802_OPMODE_STANDBY;
 130                 break;
 131         default:
 132                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 133                          rdev->desc->name, mode);
 134                 return -EINVAL;
 135         }
 136
 137         max77802->opmode[id] = val;
 138         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 139                                   rdev->desc->enable_mask, val << shift);
 140 }
 141
 142 /*
 143  * Mode 1 (Output[ON/OFF] by PWRREQ) is not supported on some LDOs
 144  * (Enable Control Logic2 by PWRREQ)
 145  *
 146  * LDOs 1, 20, 21, and 3,
 147  *
 148  */
 149 static int max77802_ldo_set_suspend_mode_logic2(struct regulator_dev *rdev,
 150                                                 unsigned int mode)
 151 {
 152         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 153         int id = rdev_get_id(rdev);
 154         unsigned int val;
 155         int shift = max77802_get_opmode_shift(id);
 156
 157         switch (mode) {
 158         case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 159                 val = MAX77802_OPMODE_LP;
 160                 break;
 161         case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 162                 val = MAX77802_OPMODE_NORMAL;
 163                 break;
 164         default:
 165                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 166                          rdev->desc->name, mode);
 167                 return -EINVAL;
 168         }
 169
 170         max77802->opmode[id] = val;
 171         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 172                                   rdev->desc->enable_mask, val << shift);
 173 }
 174
 175 static int max77802_enable(struct regulator_dev *rdev)
 176 {
 177         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 178         int id = rdev_get_id(rdev);
 179         int shift = max77802_get_opmode_shift(id);
 180
 181         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 182                                   rdev->desc->enable_mask,
 183                                   max77802->opmode[id] << shift);
 184 }
 185
 186 static int max77802_find_ramp_value(struct regulator_dev *rdev,
 187                                     const unsigned int limits[], int size,
 188                                     unsigned int ramp_delay)
 189 {
 190         int i;
 191
 192         for (i = 0; i < size; i++) {
 193                 if (ramp_delay <= limits[i])
 194                         return i;
 195         }
 196
 197         /* Use maximum value for no ramp control */
 198         dev_warn(&rdev->dev, "%s: ramp_delay: %d not supported, setting 100000\n",
 199                  rdev->desc->name, ramp_delay);
 200         return size - 1;
 201 }
 202
 203 /* Used for BUCKs 2-4 */
 204 static int max77802_set_ramp_delay_2bit(struct regulator_dev *rdev,
 205                                         int ramp_delay)
 206 {
 207         int id = rdev_get_id(rdev);
 208         unsigned int ramp_value;
 209
 210         if (id > MAX77802_BUCK4) {
 211                         dev_warn(&rdev->dev,
 212                                  "%s: regulator: ramp delay not supported\n",
 213                                  rdev->desc->name);
 214                 return -EINVAL;
 215         }
 216         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_2bit,
 217                                 ARRAY_SIZE(ramp_table_77802_2bit), ramp_delay);
 218
 219         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 220                                   MAX77802_RAMP_RATE_MASK_2BIT,
 221                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_2BIT);
 222 }
 223
 224 /* For BUCK1, 6 */
 225 static int max77802_set_ramp_delay_4bit(struct regulator_dev *rdev,
 226                                             int ramp_delay)
 227 {
 228         unsigned int ramp_value;
 229
 230         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_4bit,
 231                                 ARRAY_SIZE(ramp_table_77802_4bit), ramp_delay);
 232
 233         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 234                                   MAX77802_RAMP_RATE_MASK_4BIT,
 235                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_4BIT);
 236 }
 237
 238 /*
 239  * LDOs 2, 4-19, 22-35
 240  */
 241 static struct regulator_ops max77802_ldo_ops_logic1 = {
 242         .list_voltage           = regulator_list_voltage_linear,
 243         .map_voltage            = regulator_map_voltage_linear,
 244         .is_enabled             = regulator_is_enabled_regmap,
 245         .enable                 = max77802_enable,
 246         .disable                = regulator_disable_regmap,
 247         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 248         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 249         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 250         .set_suspend_mode       = max77802_ldo_set_suspend_mode_logic1,
 251 };
 252
 253 /*
 254  * LDOs 1, 20, 21, 3
 255  */
 256 static struct regulator_ops max77802_ldo_ops_logic2 = {
 257         .list_voltage           = regulator_list_voltage_linear,
 258         .map_voltage            = regulator_map_voltage_linear,
 259         .is_enabled             = regulator_is_enabled_regmap,
 260         .enable                 = max77802_enable,
 261         .disable                = regulator_disable_regmap,
 262         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 263         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 264         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 265         .set_suspend_mode       = max77802_ldo_set_suspend_mode_logic2,
 266 };
 267
 268 /* BUCKS 1, 6 */
 269 static struct regulator_ops max77802_buck_16_dvs_ops = {
 270         .list_voltage           = regulator_list_voltage_linear,
 271         .map_voltage            = regulator_map_voltage_linear,
 272         .is_enabled             = regulator_is_enabled_regmap,
 273         .enable                 = max77802_enable,
 274         .disable                = regulator_disable_regmap,
 275         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 276         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 277         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 278         .set_ramp_delay         = max77802_set_ramp_delay_4bit,
 279         .set_suspend_disable    = max77802_buck_set_suspend_disable,
 280 };
 281
 282 /* BUCKs 2-4, 5, 7-10 */
 283 static struct regulator_ops max77802_buck_dvs_ops = {
 284         .list_voltage           = regulator_list_voltage_linear,
 285         .map_voltage            = regulator_map_voltage_linear,
 286         .is_enabled             = regulator_is_enabled_regmap,
 287         .enable                 = max77802_enable,
 288         .disable                = regulator_disable_regmap,
 289         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 290         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 291         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 292         .set_ramp_delay         = max77802_set_ramp_delay_2bit,
 293         .set_suspend_disable    = max77802_buck_set_suspend_disable,
 294 };
 295
 296 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
 297 #define regulator_77802_desc_p_ldo(num, supply, log)    {               \
 298         .name           = "LDO"#num,                                    \
 299         .id             = MAX77802_LDO##num,                            \
 300         .supply_name    = "inl"#supply,                                 \
 301         .ops            = &max77802_ldo_ops_logic##log,                 \
 302         .type           = REGULATOR_VOLTAGE,                            \
 303         .owner          = THIS_MODULE,                                  \
 304         .min_uV         = 800000,                                       \
 305         .uV_step        = 50000,                                        \
 306         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 307         .n_voltages     = 1 << 6,                                       \
 308         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 309         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 310         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 311         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 312 }
 313
 314 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
 315 #define regulator_77802_desc_n_ldo(num, supply, log)   {                \
 316         .name           = "LDO"#num,                                    \
 317         .id             = MAX77802_LDO##num,                            \
 318         .supply_name    = "inl"#supply,                                 \
 319         .ops            = &max77802_ldo_ops_logic##log,                 \
 320         .type           = REGULATOR_VOLTAGE,                            \
 321         .owner          = THIS_MODULE,                                  \
 322         .min_uV         = 800000,                                       \
 323         .uV_step        = 25000,                                        \
 324         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 325         .n_voltages     = 1 << 6,                                       \
 326         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 327         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 328         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 329         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 330 }
 331
 332 /* BUCKs 1, 6 */
 333 #define regulator_77802_desc_16_buck(num)       {               \
 334         .name           = "BUCK"#num,                                   \
 335         .id             = MAX77802_BUCK##num,                           \
 336         .supply_name    = "inb"#num,                                    \
 337         .ops            = &max77802_buck_16_dvs_ops,                    \
 338         .type           = REGULATOR_VOLTAGE,                            \
 339         .owner          = THIS_MODULE,                                  \
 340         .min_uV         = 612500,                                       \
 341         .uV_step        = 6250,                                         \
 342         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 343         .n_voltages     = 1 << 8,                                       \
 344         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 345         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 346         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL,             \
 347         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 348 }
 349
 350 /* BUCKS 2-4 */
 351 #define regulator_77802_desc_234_buck(num)      {               \
 352         .name           = "BUCK"#num,                                   \
 353         .id             = MAX77802_BUCK##num,                           \
 354         .supply_name    = "inb"#num,                                    \
 355         .ops            = &max77802_buck_dvs_ops,                       \
 356         .type           = REGULATOR_VOLTAGE,                            \
 357         .owner          = THIS_MODULE,                                  \
 358         .min_uV         = 600000,                                       \
 359         .uV_step        = 6250,                                         \
 360         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 361         .n_voltages     = 0x91,                                         \
 362         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 363         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 364         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL1,            \
 365         .enable_mask    = MAX77802_OPMODE_MASK <<                       \
 366                                 MAX77802_OPMODE_BUCK234_SHIFT,          \
 367 }
 368
 369 /* BUCK 5 */
 370 #define regulator_77802_desc_buck5(num)         {               \
 371         .name           = "BUCK"#num,                                   \
 372         .id             = MAX77802_BUCK##num,                           \
 373         .supply_name    = "inb"#num,                                    \
 374         .ops            = &max77802_buck_dvs_ops,                       \
 375         .type           = REGULATOR_VOLTAGE,                            \
 376         .owner          = THIS_MODULE,                                  \
 377         .min_uV         = 750000,                                       \
 378         .uV_step        = 50000,                                        \
 379         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 380         .n_voltages     = 1 << 6,                                       \
 381         .vsel_reg       = MAX77802_REG_BUCK5OUT,                        \
 382         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 383         .enable_reg     = MAX77802_REG_BUCK5CTRL,                       \
 384         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 385 }
 386
 387 /* BUCKs 7-10 */
 388 #define regulator_77802_desc_buck7_10(num)      {               \
 389         .name           = "BUCK"#num,                                   \
 390         .id             = MAX77802_BUCK##num,                           \
 391         .supply_name    = "inb"#num,                                    \
 392         .ops            = &max77802_buck_dvs_ops,                       \
 393         .type           = REGULATOR_VOLTAGE,                            \
 394         .owner          = THIS_MODULE,                                  \
 395         .min_uV         = 750000,                                       \
 396         .uV_step        = 50000,                                        \
 397         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 398         .n_voltages     = 1 << 6,                                       \
 399         .vsel_reg       = MAX77802_REG_BUCK7OUT + (num - 7) * 3,        \
 400         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 401         .enable_reg     = MAX77802_REG_BUCK7CTRL + (num - 7) * 3,       \
 402         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 403 }
 404
 405 static struct regulator_desc regulators[] = {
 406         regulator_77802_desc_16_buck(1),
 407         regulator_77802_desc_234_buck(2),
 408         regulator_77802_desc_234_buck(3),
 409         regulator_77802_desc_234_buck(4),
 410         regulator_77802_desc_buck5(5),
 411         regulator_77802_desc_16_buck(6),
 412         regulator_77802_desc_buck7_10(7),
 413         regulator_77802_desc_buck7_10(8),
 414         regulator_77802_desc_buck7_10(9),
 415         regulator_77802_desc_buck7_10(10),
 416         regulator_77802_desc_n_ldo(1, 10, 2),
 417         regulator_77802_desc_n_ldo(2, 10, 1),
 418         regulator_77802_desc_p_ldo(3, 3, 2),
 419         regulator_77802_desc_p_ldo(4, 6, 1),
 420         regulator_77802_desc_p_ldo(5, 3, 1),
 421         regulator_77802_desc_p_ldo(6, 3, 1),
 422         regulator_77802_desc_p_ldo(7, 3, 1),
 423         regulator_77802_desc_n_ldo(8, 1, 1),
 424         regulator_77802_desc_p_ldo(9, 5, 1),
 425         regulator_77802_desc_p_ldo(10, 4, 1),
 426         regulator_77802_desc_p_ldo(11, 4, 1),
 427         regulator_77802_desc_p_ldo(12, 9, 1),
 428         regulator_77802_desc_p_ldo(13, 4, 1),
 429         regulator_77802_desc_p_ldo(14, 4, 1),
 430         regulator_77802_desc_n_ldo(15, 1, 1),
 431         regulator_77802_desc_n_ldo(17, 2, 1),
 432         regulator_77802_desc_p_ldo(18, 7, 1),
 433         regulator_77802_desc_p_ldo(19, 5, 1),
 434         regulator_77802_desc_p_ldo(20, 7, 2),
 435         regulator_77802_desc_p_ldo(21, 6, 2),
 436         regulator_77802_desc_p_ldo(23, 9, 1),
 437         regulator_77802_desc_p_ldo(24, 6, 1),
 438         regulator_77802_desc_p_ldo(25, 9, 1),
 439         regulator_77802_desc_p_ldo(26, 9, 1),
 440         regulator_77802_desc_n_ldo(27, 2, 1),
 441         regulator_77802_desc_p_ldo(28, 7, 1),
 442         regulator_77802_desc_p_ldo(29, 7, 1),
 443         regulator_77802_desc_n_ldo(30, 2, 1),
 444         regulator_77802_desc_p_ldo(32, 9, 1),
 445         regulator_77802_desc_p_ldo(33, 6, 1),
 446         regulator_77802_desc_p_ldo(34, 9, 1),
 447         regulator_77802_desc_n_ldo(35, 2, 1),
 448 };
 449
 450 #ifdef CONFIG_OF
 451 static int max77802_pmic_dt_parse_pdata(struct platform_device *pdev,
 452                                         struct max77686_platform_data *pdata)
 453 {
 454         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 455         struct device_node *pmic_np, *regulators_np;
 456         struct max77686_regulator_data *rdata;
 457         struct of_regulator_match rmatch;
 458         unsigned int i;
 459
 460         pmic_np = iodev->dev->of_node;
 461         regulators_np = of_get_child_by_name(pmic_np, "regulators");
 462         if (!regulators_np) {
 463                 dev_err(&pdev->dev, "could not find regulators sub-node\n");
 464                 return -EINVAL;
 465         }
 466
 467         pdata->num_regulators = ARRAY_SIZE(regulators);
 468         rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
 469                              pdata->num_regulators, GFP_KERNEL);
 470         if (!rdata) {
 471                 of_node_put(regulators_np);
 472                 return -ENOMEM;
 473         }
 474
 475         for (i = 0; i < pdata->num_regulators; i++) {
 476                 rmatch.name = regulators[i].name;
 477                 rmatch.init_data = NULL;
 478                 rmatch.of_node = NULL;
 479                 if (of_regulator_match(&pdev->dev, regulators_np, &rmatch,
 480                                        1) != 1) {
 481                         dev_warn(&pdev->dev, "No matching regulator for '%s'\n",
 482                                  rmatch.name);
 483                         continue;
 484                 }
 485                 rdata[i].initdata = rmatch.init_data;
 486                 rdata[i].of_node = rmatch.of_node;
 487                 rdata[i].id = regulators[i].id;
 488         }
 489
 490         pdata->regulators = rdata;
 491         of_node_put(regulators_np);
 492
 493         return 0;
 494 }
 495 #else
 496 static int max77802_pmic_dt_parse_pdata(struct platform_device *pdev,
 497                                         struct max77686_platform_data *pdata)
 498 {
 499         return 0;
 500 }
 501 #endif /* CONFIG_OF */
 502
 503 static int max77802_pmic_probe(struct platform_device *pdev)
 504 {
 505         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 506         struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
 507         struct max77802_regulator_prv *max77802;
 508         int i, ret = 0, val;
 509         struct regulator_config config = { };
 510
 511         /* This is allocated by the MFD driver */
 512         if (!pdata) {
 513                 dev_err(&pdev->dev, "no platform data found for regulator\n");
 514                 return -ENODEV;
 515         }
 516
 517         max77802 = devm_kzalloc(&pdev->dev,
 518                                 sizeof(struct max77802_regulator_prv),
 519                                 GFP_KERNEL);
 520         if (!max77802)
 521                 return -ENOMEM;
 522
 523         if (iodev->dev->of_node) {
 524                 ret = max77802_pmic_dt_parse_pdata(pdev, pdata);
 525                 if (ret)
 526                         return ret;
 527         }
 528
 529         config.dev = iodev->dev;
 530         config.regmap = iodev->regmap;
 531         config.driver_data = max77802;
 532         platform_set_drvdata(pdev, max77802);
 533
 534         for (i = 0; i < MAX77802_REG_MAX; i++) {
 535                 struct regulator_dev *rdev;
 536                 int id = pdata->regulators[i].id;
 537                 int shift = max77802_get_opmode_shift(id);
 538
 539                 config.init_data = pdata->regulators[i].initdata;
 540                 config.of_node = pdata->regulators[i].of_node;
 541
 542                 ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
 543                 val = val >> shift & MAX77802_OPMODE_MASK;
 544
 545                 /*
 546                  * If the regulator is disabled and the system warm rebooted,
 547                  * the hardware reports OFF as the regulator operating mode.
 548                  * Default to operating mode NORMAL in that case.
 549                  */
 550                 if (val == MAX77802_OPMODE_OFF)
 551                         max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 552                 else
 553                         max77802->opmode[id] = val;
 554
 555                 rdev = devm_regulator_register(&pdev->dev,
 556                                                &regulators[i], &config);
 557                 if (IS_ERR(rdev)) {
 558                         dev_err(&pdev->dev,
 559                                 "regulator init failed for %d\n", i);
 560                         return PTR_ERR(rdev);
 561                 }
 562         }
 563
 564         return 0;
 565 }
 566
 567 static const struct platform_device_id max77802_pmic_id[] = {
 568         {"max77802-pmic", 0},
 569         { },
 570 };
 571 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
 572
 573 static struct platform_driver max77802_pmic_driver = {
 574         .driver = {
 575                 .name = "max77802-pmic",
 576                 .owner = THIS_MODULE,
 577         },
 578         .probe = max77802_pmic_probe,
 579         .id_table = max77802_pmic_id,
 580 };
 581
 582 module_platform_driver(max77802_pmic_driver);
 583
 584 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
 585 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
 586 MODULE_LICENSE("GPL");