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 #define MAX77802_OFF_PWRREQ             0x1
  53
  54 /* MAX77802 has two register formats: 2-bit and 4-bit */
  55 static const unsigned int ramp_table_77802_2bit[] = {
  56         12500,
  57         25000,
  58         50000,
  59         100000,
  60 };
  61
  62 static unsigned int ramp_table_77802_4bit[] = {
  63         1000,   2000,   3030,   4000,
  64         5000,   5880,   7140,   8330,
  65         9090,   10000,  11110,  12500,
  66         16670,  25000,  50000,  100000,
  67 };
  68
  69 struct max77802_regulator_prv {
  70         unsigned int opmode[MAX77802_REG_MAX];
  71 };
  72
  73 static int max77802_get_opmode_shift(int id)
  74 {
  75         if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
  76                                      id <= MAX77802_BUCK10))
  77                 return 0;
  78
  79         if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
  80                 return MAX77802_OPMODE_BUCK234_SHIFT;
  81
  82         if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
  83                 return MAX77802_OPMODE_SHIFT_LDO;
  84
  85         return -EINVAL;
  86 }
  87
  88 /**
  89  * max77802_set_suspend_disable - Disable the regulator during system suspend
  90  * @rdev: regulator to mark as disabled
  91  *
  92  * All regulators expect LDO 1, 3, 20 and 21 support OFF by PWRREQ.
  93  * Configure the regulator so the PMIC will turn it OFF during system suspend.
  94  */
  95 static int max77802_set_suspend_disable(struct regulator_dev *rdev)
  96 {
  97         unsigned int val = MAX77802_OFF_PWRREQ;
  98         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
  99         int id = rdev_get_id(rdev);
 100         int shift = max77802_get_opmode_shift(id);
 101
 102         max77802->opmode[id] = val;
 103         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 104                                   rdev->desc->enable_mask, val << shift);
 105 }
 106
 107 /*
 108  * Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state
 109  * (Enable Control Logic1 by PWRREQ)
 110  *
 111  * LDOs 2, 4-19, 22-35.
 112  *
 113  */
 114 static int max77802_ldo_set_suspend_mode_logic1(struct regulator_dev *rdev,
 115                                                 unsigned int mode)
 116 {
 117         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 118         int id = rdev_get_id(rdev);
 119         unsigned int val;
 120         int shift = max77802_get_opmode_shift(id);
 121
 122         switch (mode) {
 123         case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 124                 val = MAX77802_OPMODE_LP;
 125                 break;
 126         case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 127                 val = MAX77802_OPMODE_NORMAL;
 128                 break;
 129         case REGULATOR_MODE_STANDBY:                    /* ON/OFF by PWRREQ */
 130                 val = MAX77802_OPMODE_STANDBY;
 131                 break;
 132         default:
 133                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 134                          rdev->desc->name, mode);
 135                 return -EINVAL;
 136         }
 137
 138         max77802->opmode[id] = val;
 139         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 140                                   rdev->desc->enable_mask, val << shift);
 141 }
 142
 143 /*
 144  * Mode 1 (Output[ON/OFF] by PWRREQ) is not supported on some LDOs
 145  * (Enable Control Logic2 by PWRREQ)
 146  *
 147  * LDOs 1, 20, 21, and 3,
 148  *
 149  */
 150 static int max77802_ldo_set_suspend_mode_logic2(struct regulator_dev *rdev,
 151                                                 unsigned int mode)
 152 {
 153         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 154         int id = rdev_get_id(rdev);
 155         unsigned int val;
 156         int shift = max77802_get_opmode_shift(id);
 157
 158         switch (mode) {
 159         case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 160                 val = MAX77802_OPMODE_LP;
 161                 break;
 162         case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 163                 val = MAX77802_OPMODE_NORMAL;
 164                 break;
 165         default:
 166                 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
 167                          rdev->desc->name, mode);
 168                 return -EINVAL;
 169         }
 170
 171         max77802->opmode[id] = val;
 172         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 173                                   rdev->desc->enable_mask, val << shift);
 174 }
 175
 176 static int max77802_enable(struct regulator_dev *rdev)
 177 {
 178         struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
 179         int id = rdev_get_id(rdev);
 180         int shift = max77802_get_opmode_shift(id);
 181
 182         if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
 183                 max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 184
 185         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 186                                   rdev->desc->enable_mask,
 187                                   max77802->opmode[id] << shift);
 188 }
 189
 190 static int max77802_find_ramp_value(struct regulator_dev *rdev,
 191                                     const unsigned int limits[], int size,
 192                                     unsigned int ramp_delay)
 193 {
 194         int i;
 195
 196         for (i = 0; i < size; i++) {
 197                 if (ramp_delay <= limits[i])
 198                         return i;
 199         }
 200
 201         /* Use maximum value for no ramp control */
 202         dev_warn(&rdev->dev, "%s: ramp_delay: %d not supported, setting 100000\n",
 203                  rdev->desc->name, ramp_delay);
 204         return size - 1;
 205 }
 206
 207 /* Used for BUCKs 2-4 */
 208 static int max77802_set_ramp_delay_2bit(struct regulator_dev *rdev,
 209                                         int ramp_delay)
 210 {
 211         int id = rdev_get_id(rdev);
 212         unsigned int ramp_value;
 213
 214         if (id > MAX77802_BUCK4) {
 215                         dev_warn(&rdev->dev,
 216                                  "%s: regulator: ramp delay not supported\n",
 217                                  rdev->desc->name);
 218                 return -EINVAL;
 219         }
 220         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_2bit,
 221                                 ARRAY_SIZE(ramp_table_77802_2bit), ramp_delay);
 222
 223         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 224                                   MAX77802_RAMP_RATE_MASK_2BIT,
 225                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_2BIT);
 226 }
 227
 228 /* For BUCK1, 6 */
 229 static int max77802_set_ramp_delay_4bit(struct regulator_dev *rdev,
 230                                             int ramp_delay)
 231 {
 232         unsigned int ramp_value;
 233
 234         ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_4bit,
 235                                 ARRAY_SIZE(ramp_table_77802_4bit), ramp_delay);
 236
 237         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 238                                   MAX77802_RAMP_RATE_MASK_4BIT,
 239                                   ramp_value << MAX77802_RAMP_RATE_SHIFT_4BIT);
 240 }
 241
 242 /*
 243  * LDOs 2, 4-19, 22-35
 244  */
 245 static struct regulator_ops max77802_ldo_ops_logic1 = {
 246         .list_voltage           = regulator_list_voltage_linear,
 247         .map_voltage            = regulator_map_voltage_linear,
 248         .is_enabled             = regulator_is_enabled_regmap,
 249         .enable                 = max77802_enable,
 250         .disable                = regulator_disable_regmap,
 251         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 252         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 253         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 254         .set_suspend_enable     = max77802_enable,
 255         .set_suspend_disable    = max77802_set_suspend_disable,
 256         .set_suspend_mode       = max77802_ldo_set_suspend_mode_logic1,
 257 };
 258
 259 /*
 260  * LDOs 1, 20, 21, 3
 261  */
 262 static struct regulator_ops max77802_ldo_ops_logic2 = {
 263         .list_voltage           = regulator_list_voltage_linear,
 264         .map_voltage            = regulator_map_voltage_linear,
 265         .is_enabled             = regulator_is_enabled_regmap,
 266         .enable                 = max77802_enable,
 267         .disable                = regulator_disable_regmap,
 268         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 269         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 270         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 271         .set_suspend_mode       = max77802_ldo_set_suspend_mode_logic2,
 272 };
 273
 274 /* BUCKS 1, 6 */
 275 static struct regulator_ops max77802_buck_16_dvs_ops = {
 276         .list_voltage           = regulator_list_voltage_linear,
 277         .map_voltage            = regulator_map_voltage_linear,
 278         .is_enabled             = regulator_is_enabled_regmap,
 279         .enable                 = max77802_enable,
 280         .disable                = regulator_disable_regmap,
 281         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 282         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 283         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 284         .set_ramp_delay         = max77802_set_ramp_delay_4bit,
 285         .set_suspend_enable     = max77802_enable,
 286         .set_suspend_disable    = max77802_set_suspend_disable,
 287 };
 288
 289 /* BUCKs 2-4, 5, 7-10 */
 290 static struct regulator_ops max77802_buck_dvs_ops = {
 291         .list_voltage           = regulator_list_voltage_linear,
 292         .map_voltage            = regulator_map_voltage_linear,
 293         .is_enabled             = regulator_is_enabled_regmap,
 294         .enable                 = max77802_enable,
 295         .disable                = regulator_disable_regmap,
 296         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 297         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 298         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 299         .set_ramp_delay         = max77802_set_ramp_delay_2bit,
 300         .set_suspend_enable     = max77802_enable,
 301         .set_suspend_disable    = max77802_set_suspend_disable,
 302 };
 303
 304 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
 305 #define regulator_77802_desc_p_ldo(num, supply, log)    {               \
 306         .name           = "LDO"#num,                                    \
 307         .id             = MAX77802_LDO##num,                            \
 308         .supply_name    = "inl"#supply,                                 \
 309         .ops            = &max77802_ldo_ops_logic##log,                 \
 310         .type           = REGULATOR_VOLTAGE,                            \
 311         .owner          = THIS_MODULE,                                  \
 312         .min_uV         = 800000,                                       \
 313         .uV_step        = 50000,                                        \
 314         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 315         .n_voltages     = 1 << 6,                                       \
 316         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 317         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 318         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 319         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 320 }
 321
 322 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
 323 #define regulator_77802_desc_n_ldo(num, supply, log)   {                \
 324         .name           = "LDO"#num,                                    \
 325         .id             = MAX77802_LDO##num,                            \
 326         .supply_name    = "inl"#supply,                                 \
 327         .ops            = &max77802_ldo_ops_logic##log,                 \
 328         .type           = REGULATOR_VOLTAGE,                            \
 329         .owner          = THIS_MODULE,                                  \
 330         .min_uV         = 800000,                                       \
 331         .uV_step        = 25000,                                        \
 332         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 333         .n_voltages     = 1 << 6,                                       \
 334         .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 335         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 336         .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
 337         .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
 338 }
 339
 340 /* BUCKs 1, 6 */
 341 #define regulator_77802_desc_16_buck(num)       {               \
 342         .name           = "BUCK"#num,                                   \
 343         .id             = MAX77802_BUCK##num,                           \
 344         .supply_name    = "inb"#num,                                    \
 345         .ops            = &max77802_buck_16_dvs_ops,                    \
 346         .type           = REGULATOR_VOLTAGE,                            \
 347         .owner          = THIS_MODULE,                                  \
 348         .min_uV         = 612500,                                       \
 349         .uV_step        = 6250,                                         \
 350         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 351         .n_voltages     = 1 << 8,                                       \
 352         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 353         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 354         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL,             \
 355         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 356 }
 357
 358 /* BUCKS 2-4 */
 359 #define regulator_77802_desc_234_buck(num)      {               \
 360         .name           = "BUCK"#num,                                   \
 361         .id             = MAX77802_BUCK##num,                           \
 362         .supply_name    = "inb"#num,                                    \
 363         .ops            = &max77802_buck_dvs_ops,                       \
 364         .type           = REGULATOR_VOLTAGE,                            \
 365         .owner          = THIS_MODULE,                                  \
 366         .min_uV         = 600000,                                       \
 367         .uV_step        = 6250,                                         \
 368         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 369         .n_voltages     = 0x91,                                         \
 370         .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
 371         .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
 372         .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL1,            \
 373         .enable_mask    = MAX77802_OPMODE_MASK <<                       \
 374                                 MAX77802_OPMODE_BUCK234_SHIFT,          \
 375 }
 376
 377 /* BUCK 5 */
 378 #define regulator_77802_desc_buck5(num)         {               \
 379         .name           = "BUCK"#num,                                   \
 380         .id             = MAX77802_BUCK##num,                           \
 381         .supply_name    = "inb"#num,                                    \
 382         .ops            = &max77802_buck_dvs_ops,                       \
 383         .type           = REGULATOR_VOLTAGE,                            \
 384         .owner          = THIS_MODULE,                                  \
 385         .min_uV         = 750000,                                       \
 386         .uV_step        = 50000,                                        \
 387         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 388         .n_voltages     = 1 << 6,                                       \
 389         .vsel_reg       = MAX77802_REG_BUCK5OUT,                        \
 390         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 391         .enable_reg     = MAX77802_REG_BUCK5CTRL,                       \
 392         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 393 }
 394
 395 /* BUCKs 7-10 */
 396 #define regulator_77802_desc_buck7_10(num)      {               \
 397         .name           = "BUCK"#num,                                   \
 398         .id             = MAX77802_BUCK##num,                           \
 399         .supply_name    = "inb"#num,                                    \
 400         .ops            = &max77802_buck_dvs_ops,                       \
 401         .type           = REGULATOR_VOLTAGE,                            \
 402         .owner          = THIS_MODULE,                                  \
 403         .min_uV         = 750000,                                       \
 404         .uV_step        = 50000,                                        \
 405         .ramp_delay     = MAX77802_RAMP_DELAY,                          \
 406         .n_voltages     = 1 << 6,                                       \
 407         .vsel_reg       = MAX77802_REG_BUCK7OUT + (num - 7) * 3,        \
 408         .vsel_mask      = MAX77802_VSEL_MASK,                           \
 409         .enable_reg     = MAX77802_REG_BUCK7CTRL + (num - 7) * 3,       \
 410         .enable_mask    = MAX77802_OPMODE_MASK,                         \
 411 }
 412
 413 static struct regulator_desc regulators[] = {
 414         regulator_77802_desc_16_buck(1),
 415         regulator_77802_desc_234_buck(2),
 416         regulator_77802_desc_234_buck(3),
 417         regulator_77802_desc_234_buck(4),
 418         regulator_77802_desc_buck5(5),
 419         regulator_77802_desc_16_buck(6),
 420         regulator_77802_desc_buck7_10(7),
 421         regulator_77802_desc_buck7_10(8),
 422         regulator_77802_desc_buck7_10(9),
 423         regulator_77802_desc_buck7_10(10),
 424         regulator_77802_desc_n_ldo(1, 10, 2),
 425         regulator_77802_desc_n_ldo(2, 10, 1),
 426         regulator_77802_desc_p_ldo(3, 3, 2),
 427         regulator_77802_desc_p_ldo(4, 6, 1),
 428         regulator_77802_desc_p_ldo(5, 3, 1),
 429         regulator_77802_desc_p_ldo(6, 3, 1),
 430         regulator_77802_desc_p_ldo(7, 3, 1),
 431         regulator_77802_desc_n_ldo(8, 1, 1),
 432         regulator_77802_desc_p_ldo(9, 5, 1),
 433         regulator_77802_desc_p_ldo(10, 4, 1),
 434         regulator_77802_desc_p_ldo(11, 4, 1),
 435         regulator_77802_desc_p_ldo(12, 9, 1),
 436         regulator_77802_desc_p_ldo(13, 4, 1),
 437         regulator_77802_desc_p_ldo(14, 4, 1),
 438         regulator_77802_desc_n_ldo(15, 1, 1),
 439         regulator_77802_desc_n_ldo(17, 2, 1),
 440         regulator_77802_desc_p_ldo(18, 7, 1),
 441         regulator_77802_desc_p_ldo(19, 5, 1),
 442         regulator_77802_desc_p_ldo(20, 7, 2),
 443         regulator_77802_desc_p_ldo(21, 6, 2),
 444         regulator_77802_desc_p_ldo(23, 9, 1),
 445         regulator_77802_desc_p_ldo(24, 6, 1),
 446         regulator_77802_desc_p_ldo(25, 9, 1),
 447         regulator_77802_desc_p_ldo(26, 9, 1),
 448         regulator_77802_desc_n_ldo(27, 2, 1),
 449         regulator_77802_desc_p_ldo(28, 7, 1),
 450         regulator_77802_desc_p_ldo(29, 7, 1),
 451         regulator_77802_desc_n_ldo(30, 2, 1),
 452         regulator_77802_desc_p_ldo(32, 9, 1),
 453         regulator_77802_desc_p_ldo(33, 6, 1),
 454         regulator_77802_desc_p_ldo(34, 9, 1),
 455         regulator_77802_desc_n_ldo(35, 2, 1),
 456 };
 457
 458 #ifdef CONFIG_OF
 459 static int max77802_pmic_dt_parse_pdata(struct platform_device *pdev,
 460                                         struct max77686_platform_data *pdata)
 461 {
 462         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 463         struct device_node *pmic_np, *regulators_np;
 464         struct max77686_regulator_data *rdata;
 465         struct of_regulator_match rmatch;
 466         unsigned int i;
 467
 468         pmic_np = iodev->dev->of_node;
 469         regulators_np = of_get_child_by_name(pmic_np, "regulators");
 470         if (!regulators_np) {
 471                 dev_err(&pdev->dev, "could not find regulators sub-node\n");
 472                 return -EINVAL;
 473         }
 474
 475         pdata->num_regulators = ARRAY_SIZE(regulators);
 476         rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
 477                              pdata->num_regulators, GFP_KERNEL);
 478         if (!rdata) {
 479                 of_node_put(regulators_np);
 480                 return -ENOMEM;
 481         }
 482
 483         for (i = 0; i < pdata->num_regulators; i++) {
 484                 rmatch.name = regulators[i].name;
 485                 rmatch.init_data = NULL;
 486                 rmatch.of_node = NULL;
 487                 if (of_regulator_match(&pdev->dev, regulators_np, &rmatch,
 488                                        1) != 1) {
 489                         dev_warn(&pdev->dev, "No matching regulator for '%s'\n",
 490                                  rmatch.name);
 491                         continue;
 492                 }
 493                 rdata[i].initdata = rmatch.init_data;
 494                 rdata[i].of_node = rmatch.of_node;
 495                 rdata[i].id = regulators[i].id;
 496         }
 497
 498         pdata->regulators = rdata;
 499         of_node_put(regulators_np);
 500
 501         return 0;
 502 }
 503 #else
 504 static int max77802_pmic_dt_parse_pdata(struct platform_device *pdev,
 505                                         struct max77686_platform_data *pdata)
 506 {
 507         return 0;
 508 }
 509 #endif /* CONFIG_OF */
 510
 511 static int max77802_pmic_probe(struct platform_device *pdev)
 512 {
 513         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 514         struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
 515         struct max77802_regulator_prv *max77802;
 516         int i, ret = 0, val;
 517         struct regulator_config config = { };
 518
 519         /* This is allocated by the MFD driver */
 520         if (!pdata) {
 521                 dev_err(&pdev->dev, "no platform data found for regulator\n");
 522                 return -ENODEV;
 523         }
 524
 525         max77802 = devm_kzalloc(&pdev->dev,
 526                                 sizeof(struct max77802_regulator_prv),
 527                                 GFP_KERNEL);
 528         if (!max77802)
 529                 return -ENOMEM;
 530
 531         if (iodev->dev->of_node) {
 532                 ret = max77802_pmic_dt_parse_pdata(pdev, pdata);
 533                 if (ret)
 534                         return ret;
 535         }
 536
 537         config.dev = iodev->dev;
 538         config.regmap = iodev->regmap;
 539         config.driver_data = max77802;
 540         platform_set_drvdata(pdev, max77802);
 541
 542         for (i = 0; i < MAX77802_REG_MAX; i++) {
 543                 struct regulator_dev *rdev;
 544                 int id = pdata->regulators[i].id;
 545                 int shift = max77802_get_opmode_shift(id);
 546
 547                 config.init_data = pdata->regulators[i].initdata;
 548                 config.of_node = pdata->regulators[i].of_node;
 549
 550                 ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
 551                 val = val >> shift & MAX77802_OPMODE_MASK;
 552
 553                 /*
 554                  * If the regulator is disabled and the system warm rebooted,
 555                  * the hardware reports OFF as the regulator operating mode.
 556                  * Default to operating mode NORMAL in that case.
 557                  */
 558                 if (val == MAX77802_OPMODE_OFF)
 559                         max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
 560                 else
 561                         max77802->opmode[id] = val;
 562
 563                 rdev = devm_regulator_register(&pdev->dev,
 564                                                &regulators[i], &config);
 565                 if (IS_ERR(rdev)) {
 566                         dev_err(&pdev->dev,
 567                                 "regulator init failed for %d\n", i);
 568                         return PTR_ERR(rdev);
 569                 }
 570         }
 571
 572         return 0;
 573 }
 574
 575 static const struct platform_device_id max77802_pmic_id[] = {
 576         {"max77802-pmic", 0},
 577         { },
 578 };
 579 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
 580
 581 static struct platform_driver max77802_pmic_driver = {
 582         .driver = {
 583                 .name = "max77802-pmic",
 584                 .owner = THIS_MODULE,
 585         },
 586         .probe = max77802_pmic_probe,
 587         .id_table = max77802_pmic_id,
 588 };
 589
 590 module_platform_driver(max77802_pmic_driver);
 591
 592 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
 593 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
 594 MODULE_LICENSE("GPL");