drivers/regulator/max8997.c

   1 /*
   2  * max8997.c - Regulator driver for the Maxim 8997/8966
   3  *
   4  * Copyright (C) 2011 Samsung Electronics
   5  * MyungJoo Ham <myungjoo.ham@smasung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * This driver is based on max8998.c
  22  */
  23
  24 #include <linux/bug.h>
  25 #include <linux/err.h>
  26 #include <linux/gpio.h>
  27 #include <linux/of_gpio.h>
  28 #include <linux/slab.h>
  29 #include <linux/module.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/regulator/driver.h>
  32 #include <linux/regulator/machine.h>
  33 #include <linux/mfd/max8997.h>
  34 #include <linux/mfd/max8997-private.h>
  35 #include <linux/regulator/of_regulator.h>
  36
  37 struct max8997_data {
  38         struct device *dev;
  39         struct max8997_dev *iodev;
  40         int num_regulators;
  41         struct regulator_dev **rdev;
  42         int ramp_delay; /* in mV/us */
  43
  44         bool buck1_gpiodvs;
  45         bool buck2_gpiodvs;
  46         bool buck5_gpiodvs;
  47         u8 buck1_vol[8];
  48         u8 buck2_vol[8];
  49         u8 buck5_vol[8];
  50         int buck125_gpios[3];
  51         int buck125_gpioindex;
  52         bool ignore_gpiodvs_side_effect;
  53
  54         u8 saved_states[MAX8997_REG_MAX];
  55 };
  56
  57 static inline void max8997_set_gpio(struct max8997_data *max8997)
  58 {
  59         int set3 = (max8997->buck125_gpioindex) & 0x1;
  60         int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
  61         int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
  62
  63         gpio_set_value(max8997->buck125_gpios[0], set1);
  64         gpio_set_value(max8997->buck125_gpios[1], set2);
  65         gpio_set_value(max8997->buck125_gpios[2], set3);
  66 }
  67
  68 struct voltage_map_desc {
  69         int min;
  70         int max;
  71         int step;
  72 };
  73
  74 /* Voltage maps in mV */
  75 static const struct voltage_map_desc ldo_voltage_map_desc = {
  76         .min = 800,     .max = 3950,    .step = 50,
  77 }; /* LDO1 ~ 18, 21 all */
  78
  79 static const struct voltage_map_desc buck1245_voltage_map_desc = {
  80         .min = 650,     .max = 2225,    .step = 25,
  81 }; /* Buck1, 2, 4, 5 */
  82
  83 static const struct voltage_map_desc buck37_voltage_map_desc = {
  84         .min = 750,     .max = 3900,    .step = 50,
  85 }; /* Buck3, 7 */
  86
  87 /* current map in mA */
  88 static const struct voltage_map_desc charger_current_map_desc = {
  89         .min = 200,     .max = 950,     .step = 50,
  90 };
  91
  92 static const struct voltage_map_desc topoff_current_map_desc = {
  93         .min = 50,      .max = 200,     .step = 10,
  94 };
  95
  96 static const struct voltage_map_desc *reg_voltage_map[] = {
  97         [MAX8997_LDO1] = &ldo_voltage_map_desc,
  98         [MAX8997_LDO2] = &ldo_voltage_map_desc,
  99         [MAX8997_LDO3] = &ldo_voltage_map_desc,
 100         [MAX8997_LDO4] = &ldo_voltage_map_desc,
 101         [MAX8997_LDO5] = &ldo_voltage_map_desc,
 102         [MAX8997_LDO6] = &ldo_voltage_map_desc,
 103         [MAX8997_LDO7] = &ldo_voltage_map_desc,
 104         [MAX8997_LDO8] = &ldo_voltage_map_desc,
 105         [MAX8997_LDO9] = &ldo_voltage_map_desc,
 106         [MAX8997_LDO10] = &ldo_voltage_map_desc,
 107         [MAX8997_LDO11] = &ldo_voltage_map_desc,
 108         [MAX8997_LDO12] = &ldo_voltage_map_desc,
 109         [MAX8997_LDO13] = &ldo_voltage_map_desc,
 110         [MAX8997_LDO14] = &ldo_voltage_map_desc,
 111         [MAX8997_LDO15] = &ldo_voltage_map_desc,
 112         [MAX8997_LDO16] = &ldo_voltage_map_desc,
 113         [MAX8997_LDO17] = &ldo_voltage_map_desc,
 114         [MAX8997_LDO18] = &ldo_voltage_map_desc,
 115         [MAX8997_LDO21] = &ldo_voltage_map_desc,
 116         [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
 117         [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
 118         [MAX8997_BUCK3] = &buck37_voltage_map_desc,
 119         [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
 120         [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
 121         [MAX8997_BUCK6] = NULL,
 122         [MAX8997_BUCK7] = &buck37_voltage_map_desc,
 123         [MAX8997_EN32KHZ_AP] = NULL,
 124         [MAX8997_EN32KHZ_CP] = NULL,
 125         [MAX8997_ENVICHG] = NULL,
 126         [MAX8997_ESAFEOUT1] = NULL,
 127         [MAX8997_ESAFEOUT2] = NULL,
 128         [MAX8997_CHARGER_CV] = NULL,
 129         [MAX8997_CHARGER] = &charger_current_map_desc,
 130         [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
 131 };
 132
 133 static int max8997_list_voltage_safeout(struct regulator_dev *rdev,
 134                 unsigned int selector)
 135 {
 136         int rid = rdev_get_id(rdev);
 137
 138         if (rid == MAX8997_ESAFEOUT1 || rid == MAX8997_ESAFEOUT2) {
 139                 switch (selector) {
 140                 case 0:
 141                         return 4850000;
 142                 case 1:
 143                         return 4900000;
 144                 case 2:
 145                         return 4950000;
 146                 case 3:
 147                         return 3300000;
 148                 default:
 149                         return -EINVAL;
 150                 }
 151         }
 152
 153         return -EINVAL;
 154 }
 155
 156 static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
 157                 unsigned int selector)
 158 {
 159         int rid = rdev_get_id(rdev);
 160
 161         if (rid != MAX8997_CHARGER_CV)
 162                 goto err;
 163
 164         switch (selector) {
 165         case 0x00:
 166                 return 4200000;
 167         case 0x01 ... 0x0E:
 168                 return 4000000 + 20000 * (selector - 0x01);
 169         case 0x0F:
 170                 return 4350000;
 171         default:
 172                 return -EINVAL;
 173         }
 174 err:
 175         return -EINVAL;
 176 }
 177
 178 static int max8997_list_voltage(struct regulator_dev *rdev,
 179                 unsigned int selector)
 180 {
 181         const struct voltage_map_desc *desc;
 182         int rid = rdev_get_id(rdev);
 183         int val;
 184
 185         if (rid >= ARRAY_SIZE(reg_voltage_map) ||
 186                         rid < 0)
 187                 return -EINVAL;
 188
 189         desc = reg_voltage_map[rid];
 190         if (desc == NULL)
 191                 return -EINVAL;
 192
 193         val = desc->min + desc->step * selector;
 194         if (val > desc->max)
 195                 return -EINVAL;
 196
 197         return val * 1000;
 198 }
 199
 200 static int max8997_get_enable_register(struct regulator_dev *rdev,
 201                 int *reg, int *mask, int *pattern)
 202 {
 203         int rid = rdev_get_id(rdev);
 204
 205         switch (rid) {
 206         case MAX8997_LDO1 ... MAX8997_LDO21:
 207                 *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 208                 *mask = 0xC0;
 209                 *pattern = 0xC0;
 210                 break;
 211         case MAX8997_BUCK1:
 212                 *reg = MAX8997_REG_BUCK1CTRL;
 213                 *mask = 0x01;
 214                 *pattern = 0x01;
 215                 break;
 216         case MAX8997_BUCK2:
 217                 *reg = MAX8997_REG_BUCK2CTRL;
 218                 *mask = 0x01;
 219                 *pattern = 0x01;
 220                 break;
 221         case MAX8997_BUCK3:
 222                 *reg = MAX8997_REG_BUCK3CTRL;
 223                 *mask = 0x01;
 224                 *pattern = 0x01;
 225                 break;
 226         case MAX8997_BUCK4:
 227                 *reg = MAX8997_REG_BUCK4CTRL;
 228                 *mask = 0x01;
 229                 *pattern = 0x01;
 230                 break;
 231         case MAX8997_BUCK5:
 232                 *reg = MAX8997_REG_BUCK5CTRL;
 233                 *mask = 0x01;
 234                 *pattern = 0x01;
 235                 break;
 236         case MAX8997_BUCK6:
 237                 *reg = MAX8997_REG_BUCK6CTRL;
 238                 *mask = 0x01;
 239                 *pattern = 0x01;
 240                 break;
 241         case MAX8997_BUCK7:
 242                 *reg = MAX8997_REG_BUCK7CTRL;
 243                 *mask = 0x01;
 244                 *pattern = 0x01;
 245                 break;
 246         case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
 247                 *reg = MAX8997_REG_MAINCON1;
 248                 *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 249                 *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 250                 break;
 251         case MAX8997_ENVICHG:
 252                 *reg = MAX8997_REG_MBCCTRL1;
 253                 *mask = 0x80;
 254                 *pattern = 0x80;
 255                 break;
 256         case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
 257                 *reg = MAX8997_REG_SAFEOUTCTRL;
 258                 *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
 259                 *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
 260                 break;
 261         case MAX8997_CHARGER:
 262                 *reg = MAX8997_REG_MBCCTRL2;
 263                 *mask = 0x40;
 264                 *pattern = 0x40;
 265                 break;
 266         default:
 267                 /* Not controllable or not exists */
 268                 return -EINVAL;
 269         }
 270
 271         return 0;
 272 }
 273
 274 static int max8997_reg_is_enabled(struct regulator_dev *rdev)
 275 {
 276         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 277         struct i2c_client *i2c = max8997->iodev->i2c;
 278         int ret, reg, mask, pattern;
 279         u8 val;
 280
 281         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 282         if (ret)
 283                 return ret;
 284
 285         ret = max8997_read_reg(i2c, reg, &val);
 286         if (ret)
 287                 return ret;
 288
 289         return (val & mask) == pattern;
 290 }
 291
 292 static int max8997_reg_enable(struct regulator_dev *rdev)
 293 {
 294         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 295         struct i2c_client *i2c = max8997->iodev->i2c;
 296         int ret, reg, mask, pattern;
 297
 298         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 299         if (ret)
 300                 return ret;
 301
 302         return max8997_update_reg(i2c, reg, pattern, mask);
 303 }
 304
 305 static int max8997_reg_disable(struct regulator_dev *rdev)
 306 {
 307         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 308         struct i2c_client *i2c = max8997->iodev->i2c;
 309         int ret, reg, mask, pattern;
 310
 311         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 312         if (ret)
 313                 return ret;
 314
 315         return max8997_update_reg(i2c, reg, ~pattern, mask);
 316 }
 317
 318 static int max8997_get_voltage_register(struct regulator_dev *rdev,
 319                 int *_reg, int *_shift, int *_mask)
 320 {
 321         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 322         int rid = rdev_get_id(rdev);
 323         int reg, shift = 0, mask = 0x3f;
 324
 325         switch (rid) {
 326         case MAX8997_LDO1 ... MAX8997_LDO21:
 327                 reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 328                 break;
 329         case MAX8997_BUCK1:
 330                 reg = MAX8997_REG_BUCK1DVS1;
 331                 if (max8997->buck1_gpiodvs)
 332                         reg += max8997->buck125_gpioindex;
 333                 break;
 334         case MAX8997_BUCK2:
 335                 reg = MAX8997_REG_BUCK2DVS1;
 336                 if (max8997->buck2_gpiodvs)
 337                         reg += max8997->buck125_gpioindex;
 338                 break;
 339         case MAX8997_BUCK3:
 340                 reg = MAX8997_REG_BUCK3DVS;
 341                 break;
 342         case MAX8997_BUCK4:
 343                 reg = MAX8997_REG_BUCK4DVS;
 344                 break;
 345         case MAX8997_BUCK5:
 346                 reg = MAX8997_REG_BUCK5DVS1;
 347                 if (max8997->buck5_gpiodvs)
 348                         reg += max8997->buck125_gpioindex;
 349                 break;
 350         case MAX8997_BUCK7:
 351                 reg = MAX8997_REG_BUCK7DVS;
 352                 break;
 353         case MAX8997_ESAFEOUT1 ...  MAX8997_ESAFEOUT2:
 354                 reg = MAX8997_REG_SAFEOUTCTRL;
 355                 shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
 356                 mask = 0x3;
 357                 break;
 358         case MAX8997_CHARGER_CV:
 359                 reg = MAX8997_REG_MBCCTRL3;
 360                 shift = 0;
 361                 mask = 0xf;
 362                 break;
 363         case MAX8997_CHARGER:
 364                 reg = MAX8997_REG_MBCCTRL4;
 365                 shift = 0;
 366                 mask = 0xf;
 367                 break;
 368         case MAX8997_CHARGER_TOPOFF:
 369                 reg = MAX8997_REG_MBCCTRL5;
 370                 shift = 0;
 371                 mask = 0xf;
 372                 break;
 373         default:
 374                 return -EINVAL;
 375         }
 376
 377         *_reg = reg;
 378         *_shift = shift;
 379         *_mask = mask;
 380
 381         return 0;
 382 }
 383
 384 static int max8997_get_voltage_sel(struct regulator_dev *rdev)
 385 {
 386         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 387         struct i2c_client *i2c = max8997->iodev->i2c;
 388         int reg, shift, mask, ret;
 389         u8 val;
 390
 391         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 392         if (ret)
 393                 return ret;
 394
 395         ret = max8997_read_reg(i2c, reg, &val);
 396         if (ret)
 397                 return ret;
 398
 399         val >>= shift;
 400         val &= mask;
 401
 402         return val;
 403 }
 404
 405 static inline int max8997_get_voltage_proper_val(
 406                 const struct voltage_map_desc *desc,
 407                 int min_vol, int max_vol)
 408 {
 409         int i;
 410
 411         if (desc == NULL)
 412                 return -EINVAL;
 413
 414         if (max_vol < desc->min || min_vol > desc->max)
 415                 return -EINVAL;
 416
 417         if (min_vol < desc->min)
 418                 min_vol = desc->min;
 419
 420         i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 421
 422         if (desc->min + desc->step * i > max_vol)
 423                 return -EINVAL;
 424
 425         return i;
 426 }
 427
 428 static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
 429                 int min_uV, int max_uV, unsigned *selector)
 430 {
 431         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 432         struct i2c_client *i2c = max8997->iodev->i2c;
 433         int rid = rdev_get_id(rdev);
 434         int lb, ub;
 435         int reg, shift = 0, mask, ret = 0;
 436         u8 val = 0x0;
 437
 438         if (rid != MAX8997_CHARGER_CV)
 439                 return -EINVAL;
 440
 441         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 442         if (ret)
 443                 return ret;
 444
 445         if (max_uV < 4000000 || min_uV > 4350000)
 446                 return -EINVAL;
 447
 448         if (min_uV <= 4000000) {
 449                 if (max_uV >= 4000000)
 450                         return -EINVAL;
 451                 else
 452                         val = 0x1;
 453         } else if (min_uV <= 4200000 && max_uV >= 4200000)
 454                 val = 0x0;
 455         else {
 456                 lb = (min_uV - 4000001) / 20000 + 2;
 457                 ub = (max_uV - 4000000) / 20000 + 1;
 458
 459                 if (lb > ub)
 460                         return -EINVAL;
 461
 462                 if (lb < 0xf)
 463                         val = lb;
 464                 else {
 465                         if (ub >= 0xf)
 466                                 val = 0xf;
 467                         else
 468                                 return -EINVAL;
 469                 }
 470         }
 471
 472         *selector = val;
 473
 474         ret = max8997_update_reg(i2c, reg, val << shift, mask);
 475
 476         return ret;
 477 }
 478
 479 /*
 480  * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
 481  * BUCK1, 2, and 5 are available if they are not controlled by gpio
 482  */
 483 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
 484                 int min_uV, int max_uV, unsigned *selector)
 485 {
 486         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 487         struct i2c_client *i2c = max8997->iodev->i2c;
 488         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 489         const struct voltage_map_desc *desc;
 490         int rid = rdev_get_id(rdev);
 491         int i, reg, shift, mask, ret;
 492
 493         switch (rid) {
 494         case MAX8997_LDO1 ... MAX8997_LDO21:
 495                 break;
 496         case MAX8997_BUCK1 ... MAX8997_BUCK5:
 497                 break;
 498         case MAX8997_BUCK6:
 499                 return -EINVAL;
 500         case MAX8997_BUCK7:
 501                 break;
 502         case MAX8997_CHARGER:
 503                 break;
 504         case MAX8997_CHARGER_TOPOFF:
 505                 break;
 506         default:
 507                 return -EINVAL;
 508         }
 509
 510         desc = reg_voltage_map[rid];
 511
 512         i = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
 513         if (i < 0)
 514                 return i;
 515
 516         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 517         if (ret)
 518                 return ret;
 519
 520         ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
 521         *selector = i;
 522
 523         return ret;
 524 }
 525
 526 static int max8997_set_voltage_ldobuck_time_sel(struct regulator_dev *rdev,
 527                                                 unsigned int old_selector,
 528                                                 unsigned int new_selector)
 529 {
 530         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 531         int rid = rdev_get_id(rdev);
 532         const struct voltage_map_desc *desc = reg_voltage_map[rid];
 533
 534         /* Delay is required only if the voltage is increasing */
 535         if (old_selector >= new_selector)
 536                 return 0;
 537
 538         /* No need to delay if gpio_dvs_mode */
 539         switch (rid) {
 540         case MAX8997_BUCK1:
 541                 if (max8997->buck1_gpiodvs)
 542                         return 0;
 543                 break;
 544         case MAX8997_BUCK2:
 545                 if (max8997->buck2_gpiodvs)
 546                         return 0;
 547                 break;
 548         case MAX8997_BUCK5:
 549                 if (max8997->buck5_gpiodvs)
 550                         return 0;
 551                 break;
 552         }
 553
 554         switch (rid) {
 555         case MAX8997_BUCK1:
 556         case MAX8997_BUCK2:
 557         case MAX8997_BUCK4:
 558         case MAX8997_BUCK5:
 559                 return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
 560                                     max8997->ramp_delay);
 561         }
 562
 563         return 0;
 564 }
 565
 566 /*
 567  * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
 568  *
 569  * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
 570  * of one of the bucks may affect that of another buck, which is the side
 571  * effect of the change (set_voltage). This function examines the GPIO-DVS
 572  * configurations and checks whether such side-effect exists.
 573  */
 574 static int max8997_assess_side_effect(struct regulator_dev *rdev,
 575                 u8 new_val, int *best)
 576 {
 577         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 578         int rid = rdev_get_id(rdev);
 579         u8 *buckx_val[3];
 580         bool buckx_gpiodvs[3];
 581         int side_effect[8];
 582         int min_side_effect = INT_MAX;
 583         int i;
 584
 585         *best = -1;
 586
 587         switch (rid) {
 588         case MAX8997_BUCK1:
 589                 rid = 0;
 590                 break;
 591         case MAX8997_BUCK2:
 592                 rid = 1;
 593                 break;
 594         case MAX8997_BUCK5:
 595                 rid = 2;
 596                 break;
 597         default:
 598                 return -EINVAL;
 599         }
 600
 601         buckx_val[0] = max8997->buck1_vol;
 602         buckx_val[1] = max8997->buck2_vol;
 603         buckx_val[2] = max8997->buck5_vol;
 604         buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
 605         buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
 606         buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
 607
 608         for (i = 0; i < 8; i++) {
 609                 int others;
 610
 611                 if (new_val != (buckx_val[rid])[i]) {
 612                         side_effect[i] = -1;
 613                         continue;
 614                 }
 615
 616                 side_effect[i] = 0;
 617                 for (others = 0; others < 3; others++) {
 618                         int diff;
 619
 620                         if (others == rid)
 621                                 continue;
 622                         if (buckx_gpiodvs[others] == false)
 623                                 continue; /* Not affected */
 624                         diff = (buckx_val[others])[i] -
 625                                 (buckx_val[others])[max8997->buck125_gpioindex];
 626                         if (diff > 0)
 627                                 side_effect[i] += diff;
 628                         else if (diff < 0)
 629                                 side_effect[i] -= diff;
 630                 }
 631                 if (side_effect[i] == 0) {
 632                         *best = i;
 633                         return 0; /* NO SIDE EFFECT! Use This! */
 634                 }
 635                 if (side_effect[i] < min_side_effect) {
 636                         min_side_effect = side_effect[i];
 637                         *best = i;
 638                 }
 639         }
 640
 641         if (*best == -1)
 642                 return -EINVAL;
 643
 644         return side_effect[*best];
 645 }
 646
 647 /*
 648  * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
 649  * max8997_set_voltage_ldobuck to do the job.
 650  */
 651 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
 652                 int min_uV, int max_uV, unsigned *selector)
 653 {
 654         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 655         int rid = rdev_get_id(rdev);
 656         const struct voltage_map_desc *desc;
 657         int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
 658         bool gpio_dvs_mode = false;
 659         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 660
 661         if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
 662                 return -EINVAL;
 663
 664         switch (rid) {
 665         case MAX8997_BUCK1:
 666                 if (max8997->buck1_gpiodvs)
 667                         gpio_dvs_mode = true;
 668                 break;
 669         case MAX8997_BUCK2:
 670                 if (max8997->buck2_gpiodvs)
 671                         gpio_dvs_mode = true;
 672                 break;
 673         case MAX8997_BUCK5:
 674                 if (max8997->buck5_gpiodvs)
 675                         gpio_dvs_mode = true;
 676                 break;
 677         }
 678
 679         if (!gpio_dvs_mode)
 680                 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
 681                                                 selector);
 682
 683         desc = reg_voltage_map[rid];
 684         new_val = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
 685         if (new_val < 0)
 686                 return new_val;
 687
 688         tmp_dmg = INT_MAX;
 689         tmp_idx = -1;
 690         tmp_val = -1;
 691         do {
 692                 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
 693                 if (damage == 0)
 694                         goto out;
 695
 696                 if (tmp_dmg > damage) {
 697                         tmp_idx = new_idx;
 698                         tmp_val = new_val;
 699                         tmp_dmg = damage;
 700                 }
 701
 702                 new_val++;
 703         } while (desc->min + desc->step * new_val <= desc->max);
 704
 705         new_idx = tmp_idx;
 706         new_val = tmp_val;
 707
 708         if (max8997->ignore_gpiodvs_side_effect == false)
 709                 return -EINVAL;
 710
 711         dev_warn(&rdev->dev, "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:"
 712                         " %d -> %d\n", max8997->buck125_gpioindex, tmp_idx);
 713
 714 out:
 715         if (new_idx < 0 || new_val < 0)
 716                 return -EINVAL;
 717
 718         max8997->buck125_gpioindex = new_idx;
 719         max8997_set_gpio(max8997);
 720         *selector = new_val;
 721
 722         return 0;
 723 }
 724
 725 static const int safeoutvolt[] = {
 726         3300000,
 727         4850000,
 728         4900000,
 729         4950000,
 730 };
 731
 732 /* For SAFEOUT1 and SAFEOUT2 */
 733 static int max8997_set_voltage_safeout(struct regulator_dev *rdev,
 734                 int min_uV, int max_uV, unsigned *selector)
 735 {
 736         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 737         struct i2c_client *i2c = max8997->iodev->i2c;
 738         int rid = rdev_get_id(rdev);
 739         int reg, shift = 0, mask, ret;
 740         int i = 0;
 741         u8 val;
 742
 743         if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
 744                 return -EINVAL;
 745
 746         for (i = 0; i < ARRAY_SIZE(safeoutvolt); i++) {
 747                 if (min_uV <= safeoutvolt[i] &&
 748                                 max_uV >= safeoutvolt[i])
 749                         break;
 750         }
 751
 752         if (i >= ARRAY_SIZE(safeoutvolt))
 753                 return -EINVAL;
 754
 755         if (i == 0)
 756                 val = 0x3;
 757         else
 758                 val = i - 1;
 759
 760         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 761         if (ret)
 762                 return ret;
 763
 764         ret = max8997_update_reg(i2c, reg, val << shift, mask << shift);
 765         *selector = val;
 766
 767         return ret;
 768 }
 769
 770 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
 771 {
 772         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 773         struct i2c_client *i2c = max8997->iodev->i2c;
 774         int ret, reg, mask, pattern;
 775         int rid = rdev_get_id(rdev);
 776
 777         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 778         if (ret)
 779                 return ret;
 780
 781         max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
 782
 783         if (rid == MAX8997_LDO1 ||
 784                         rid == MAX8997_LDO10 ||
 785                         rid == MAX8997_LDO21) {
 786                 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
 787                                 rdev->desc->name);
 788                 return max8997_update_reg(i2c, reg, 0x40, mask);
 789         }
 790
 791         dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
 792                         rdev->desc->name, max8997->saved_states[rid] & mask,
 793                         (~pattern) & mask);
 794         return max8997_update_reg(i2c, reg, ~pattern, mask);
 795 }
 796
 797 static struct regulator_ops max8997_ldo_ops = {
 798         .list_voltage           = max8997_list_voltage,
 799         .is_enabled             = max8997_reg_is_enabled,
 800         .enable                 = max8997_reg_enable,
 801         .disable                = max8997_reg_disable,
 802         .get_voltage_sel        = max8997_get_voltage_sel,
 803         .set_voltage            = max8997_set_voltage_ldobuck,
 804         .set_voltage_time_sel   = max8997_set_voltage_ldobuck_time_sel,
 805         .set_suspend_disable    = max8997_reg_disable_suspend,
 806 };
 807
 808 static struct regulator_ops max8997_buck_ops = {
 809         .list_voltage           = max8997_list_voltage,
 810         .is_enabled             = max8997_reg_is_enabled,
 811         .enable                 = max8997_reg_enable,
 812         .disable                = max8997_reg_disable,
 813         .get_voltage_sel        = max8997_get_voltage_sel,
 814         .set_voltage            = max8997_set_voltage_buck,
 815         .set_voltage_time_sel   = max8997_set_voltage_ldobuck_time_sel,
 816         .set_suspend_disable    = max8997_reg_disable_suspend,
 817 };
 818
 819 static struct regulator_ops max8997_fixedvolt_ops = {
 820         .list_voltage           = max8997_list_voltage,
 821         .is_enabled             = max8997_reg_is_enabled,
 822         .enable                 = max8997_reg_enable,
 823         .disable                = max8997_reg_disable,
 824         .set_suspend_disable    = max8997_reg_disable_suspend,
 825 };
 826
 827 static struct regulator_ops max8997_safeout_ops = {
 828         .list_voltage           = max8997_list_voltage_safeout,
 829         .is_enabled             = max8997_reg_is_enabled,
 830         .enable                 = max8997_reg_enable,
 831         .disable                = max8997_reg_disable,
 832         .get_voltage_sel        = max8997_get_voltage_sel,
 833         .set_voltage            = max8997_set_voltage_safeout,
 834         .set_suspend_disable    = max8997_reg_disable_suspend,
 835 };
 836
 837 static struct regulator_ops max8997_fixedstate_ops = {
 838         .list_voltage           = max8997_list_voltage_charger_cv,
 839         .get_voltage_sel        = max8997_get_voltage_sel,
 840         .set_voltage            = max8997_set_voltage_charger_cv,
 841 };
 842
 843 static int max8997_set_current_limit(struct regulator_dev *rdev,
 844                                      int min_uA, int max_uA)
 845 {
 846         unsigned dummy;
 847         int rid = rdev_get_id(rdev);
 848
 849         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 850                 return -EINVAL;
 851
 852         /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
 853         return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
 854 }
 855
 856 static int max8997_get_current_limit(struct regulator_dev *rdev)
 857 {
 858         int sel, rid = rdev_get_id(rdev);
 859
 860         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 861                 return -EINVAL;
 862
 863         sel = max8997_get_voltage_sel(rdev);
 864         if (sel < 0)
 865                 return sel;
 866
 867         /* Reuse max8997_list_voltage to get current_limit. */
 868         return max8997_list_voltage(rdev, sel);
 869 }
 870
 871 static struct regulator_ops max8997_charger_ops = {
 872         .is_enabled             = max8997_reg_is_enabled,
 873         .enable                 = max8997_reg_enable,
 874         .disable                = max8997_reg_disable,
 875         .get_current_limit      = max8997_get_current_limit,
 876         .set_current_limit      = max8997_set_current_limit,
 877 };
 878
 879 static struct regulator_ops max8997_charger_fixedstate_ops = {
 880         .get_current_limit      = max8997_get_current_limit,
 881         .set_current_limit      = max8997_set_current_limit,
 882 };
 883
 884 #define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
 885         .name           = #_name,               \
 886         .id             = MAX8997_##_name,      \
 887         .ops            = &_ops,                \
 888         .type           = REGULATOR_VOLTAGE,    \
 889         .owner          = THIS_MODULE,          \
 890 }
 891
 892 #define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
 893         .name           = #_name,               \
 894         .id             = MAX8997_##_name,      \
 895         .ops            = &_ops,                \
 896         .type           = REGULATOR_CURRENT,    \
 897         .owner          = THIS_MODULE,          \
 898 }
 899
 900 static struct regulator_desc regulators[] = {
 901         MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
 902         MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
 903         MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
 904         MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
 905         MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
 906         MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
 907         MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
 908         MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
 909         MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
 910         MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
 911         MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
 912         MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
 913         MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
 914         MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
 915         MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
 916         MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
 917         MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
 918         MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
 919         MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
 920         MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
 921         MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
 922         MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
 923         MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
 924         MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
 925         MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
 926         MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
 927         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
 928         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
 929         MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
 930         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
 931         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
 932         MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
 933         MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
 934         MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
 935                                   max8997_charger_fixedstate_ops),
 936 };
 937
 938 #ifdef CONFIG_OF
 939 static int max8997_pmic_dt_parse_dvs_gpio(struct max8997_dev *iodev,
 940                         struct max8997_platform_data *pdata,
 941                         struct device_node *pmic_np)
 942 {
 943         int i, gpio;
 944
 945         for (i = 0; i < 3; i++) {
 946                 gpio = of_get_named_gpio(pmic_np,
 947                                         "max8997,pmic-buck125-dvs-gpios", i);
 948                 if (!gpio_is_valid(gpio)) {
 949                         dev_err(iodev->dev, "invalid gpio[%d]: %d\n", i, gpio);
 950                         return -EINVAL;
 951                 }
 952                 pdata->buck125_gpios[i] = gpio;
 953         }
 954         return 0;
 955 }
 956
 957 static int max8997_pmic_dt_parse_pdata(struct max8997_dev *iodev,
 958                                         struct max8997_platform_data *pdata)
 959 {
 960         struct device_node *pmic_np, *regulators_np, *reg_np;
 961         struct max8997_regulator_data *rdata;
 962         unsigned int i, dvs_voltage_nr = 1, ret;
 963
 964         pmic_np = iodev->dev->of_node;
 965         if (!pmic_np) {
 966                 dev_err(iodev->dev, "could not find pmic sub-node\n");
 967                 return -ENODEV;
 968         }
 969
 970         regulators_np = of_find_node_by_name(pmic_np, "regulators");
 971         if (!regulators_np) {
 972                 dev_err(iodev->dev, "could not find regulators sub-node\n");
 973                 return -EINVAL;
 974         }
 975
 976         /* count the number of regulators to be supported in pmic */
 977         pdata->num_regulators = 0;
 978         for_each_child_of_node(regulators_np, reg_np)
 979                 pdata->num_regulators++;
 980
 981         rdata = devm_kzalloc(iodev->dev, sizeof(*rdata) *
 982                                 pdata->num_regulators, GFP_KERNEL);
 983         if (!rdata) {
 984                 dev_err(iodev->dev, "could not allocate memory for "
 985                                                 "regulator data\n");
 986                 return -ENOMEM;
 987         }
 988
 989         pdata->regulators = rdata;
 990         for_each_child_of_node(regulators_np, reg_np) {
 991                 for (i = 0; i < ARRAY_SIZE(regulators); i++)
 992                         if (!of_node_cmp(reg_np->name, regulators[i].name))
 993                                 break;
 994
 995                 if (i == ARRAY_SIZE(regulators)) {
 996                         dev_warn(iodev->dev, "don't know how to configure "
 997                                 "regulator %s\n", reg_np->name);
 998                         continue;
 999                 }
1000
1001                 rdata->id = i;
1002                 rdata->initdata = of_get_regulator_init_data(
1003                                                 iodev->dev, reg_np);
1004                 rdata->reg_node = reg_np;
1005                 rdata++;
1006         }
1007
1008         if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
1009                 pdata->buck1_gpiodvs = true;
1010
1011         if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
1012                 pdata->buck2_gpiodvs = true;
1013
1014         if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
1015                 pdata->buck5_gpiodvs = true;
1016
1017         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1018                                                 pdata->buck5_gpiodvs) {
1019                 ret = max8997_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
1020                 if (ret)
1021                         return -EINVAL;
1022
1023                 if (of_property_read_u32(pmic_np,
1024                                 "max8997,pmic-buck125-default-dvs-idx",
1025                                 &pdata->buck125_default_idx)) {
1026                         pdata->buck125_default_idx = 0;
1027                 } else {
1028                         if (pdata->buck125_default_idx >= 8) {
1029                                 pdata->buck125_default_idx = 0;
1030                                 dev_info(iodev->dev, "invalid value for "
1031                                 "default dvs index, using 0 instead\n");
1032                         }
1033                 }
1034
1035                 if (of_get_property(pmic_np,
1036                         "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
1037                         pdata->ignore_gpiodvs_side_effect = true;
1038
1039                 dvs_voltage_nr = 8;
1040         }
1041
1042         if (of_property_read_u32_array(pmic_np,
1043                                 "max8997,pmic-buck1-dvs-voltage",
1044                                 pdata->buck1_voltage, dvs_voltage_nr)) {
1045                 dev_err(iodev->dev, "buck1 voltages not specified\n");
1046                 return -EINVAL;
1047         }
1048
1049         if (of_property_read_u32_array(pmic_np,
1050                                 "max8997,pmic-buck2-dvs-voltage",
1051                                 pdata->buck2_voltage, dvs_voltage_nr)) {
1052                 dev_err(iodev->dev, "buck2 voltages not specified\n");
1053                 return -EINVAL;
1054         }
1055
1056         if (of_property_read_u32_array(pmic_np,
1057                                 "max8997,pmic-buck5-dvs-voltage",
1058                                 pdata->buck5_voltage, dvs_voltage_nr)) {
1059                 dev_err(iodev->dev, "buck5 voltages not specified\n");
1060                 return -EINVAL;
1061         }
1062
1063         return 0;
1064 }
1065 #else
1066 static int max8997_pmic_dt_parse_pdata(struct max8997_dev *iodev,
1067                                         struct max8997_platform_data *pdata)
1068 {
1069         return 0;
1070 }
1071 #endif /* CONFIG_OF */
1072
1073 static int max8997_pmic_probe(struct platform_device *pdev)
1074 {
1075         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
1076         struct max8997_platform_data *pdata = iodev->pdata;
1077         struct regulator_config config = { };
1078         struct regulator_dev **rdev;
1079         struct max8997_data *max8997;
1080         struct i2c_client *i2c;
1081         int i, ret, size, nr_dvs;
1082         u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
1083
1084         if (IS_ERR_OR_NULL(pdata)) {
1085                 dev_err(pdev->dev.parent, "No platform init data supplied.\n");
1086                 return -ENODEV;
1087         }
1088
1089         if (iodev->dev->of_node) {
1090                 ret = max8997_pmic_dt_parse_pdata(iodev, pdata);
1091                 if (ret)
1092                         return ret;
1093         }
1094
1095         max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
1096                                GFP_KERNEL);
1097         if (!max8997)
1098                 return -ENOMEM;
1099
1100         size = sizeof(struct regulator_dev *) * pdata->num_regulators;
1101         max8997->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
1102         if (!max8997->rdev)
1103                 return -ENOMEM;
1104
1105         rdev = max8997->rdev;
1106         max8997->dev = &pdev->dev;
1107         max8997->iodev = iodev;
1108         max8997->num_regulators = pdata->num_regulators;
1109         platform_set_drvdata(pdev, max8997);
1110         i2c = max8997->iodev->i2c;
1111
1112         max8997->buck125_gpioindex = pdata->buck125_default_idx;
1113         max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
1114         max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
1115         max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
1116         memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
1117         max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
1118
1119         nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1120                         pdata->buck5_gpiodvs) ? 8 : 1;
1121
1122         for (i = 0; i < nr_dvs; i++) {
1123                 max8997->buck1_vol[i] = ret =
1124                         max8997_get_voltage_proper_val(
1125                                         &buck1245_voltage_map_desc,
1126                                         pdata->buck1_voltage[i] / 1000,
1127                                         pdata->buck1_voltage[i] / 1000 +
1128                                         buck1245_voltage_map_desc.step);
1129                 if (ret < 0)
1130                         goto err_out;
1131
1132                 max8997->buck2_vol[i] = ret =
1133                         max8997_get_voltage_proper_val(
1134                                         &buck1245_voltage_map_desc,
1135                                         pdata->buck2_voltage[i] / 1000,
1136                                         pdata->buck2_voltage[i] / 1000 +
1137                                         buck1245_voltage_map_desc.step);
1138                 if (ret < 0)
1139                         goto err_out;
1140
1141                 max8997->buck5_vol[i] = ret =
1142                         max8997_get_voltage_proper_val(
1143                                         &buck1245_voltage_map_desc,
1144                                         pdata->buck5_voltage[i] / 1000,
1145                                         pdata->buck5_voltage[i] / 1000 +
1146                                         buck1245_voltage_map_desc.step);
1147                 if (ret < 0)
1148                         goto err_out;
1149
1150                 if (max_buck1 < max8997->buck1_vol[i])
1151                         max_buck1 = max8997->buck1_vol[i];
1152                 if (max_buck2 < max8997->buck2_vol[i])
1153                         max_buck2 = max8997->buck2_vol[i];
1154                 if (max_buck5 < max8997->buck5_vol[i])
1155                         max_buck5 = max8997->buck5_vol[i];
1156         }
1157
1158         /* For the safety, set max voltage before setting up */
1159         for (i = 0; i < 8; i++) {
1160                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1161                                 max_buck1, 0x3f);
1162                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1163                                 max_buck2, 0x3f);
1164                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1165                                 max_buck5, 0x3f);
1166         }
1167
1168         /* Initialize all the DVS related BUCK registers */
1169         for (i = 0; i < nr_dvs; i++) {
1170                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1171                                 max8997->buck1_vol[i],
1172                                 0x3f);
1173                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1174                                 max8997->buck2_vol[i],
1175                                 0x3f);
1176                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1177                                 max8997->buck5_vol[i],
1178                                 0x3f);
1179         }
1180
1181         /*
1182          * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1183          * If at least one of them cares, set gpios.
1184          */
1185         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1186                         pdata->buck5_gpiodvs) {
1187
1188                 if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1189                                 !gpio_is_valid(pdata->buck125_gpios[1]) ||
1190                                 !gpio_is_valid(pdata->buck125_gpios[2])) {
1191                         dev_err(&pdev->dev, "GPIO NOT VALID\n");
1192                         ret = -EINVAL;
1193                         goto err_out;
1194                 }
1195
1196                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1197                                         "MAX8997 SET1");
1198                 if (ret)
1199                         goto err_out;
1200
1201                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1202                                         "MAX8997 SET2");
1203                 if (ret)
1204                         goto err_out;
1205
1206                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1207                                 "MAX8997 SET3");
1208                 if (ret)
1209                         goto err_out;
1210
1211                 gpio_direction_output(pdata->buck125_gpios[0],
1212                                 (max8997->buck125_gpioindex >> 2)
1213                                 & 0x1); /* SET1 */
1214                 gpio_direction_output(pdata->buck125_gpios[1],
1215                                 (max8997->buck125_gpioindex >> 1)
1216                                 & 0x1); /* SET2 */
1217                 gpio_direction_output(pdata->buck125_gpios[2],
1218                                 (max8997->buck125_gpioindex >> 0)
1219                                 & 0x1); /* SET3 */
1220         }
1221
1222         /* DVS-GPIO disabled */
1223         max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1224                         (1 << 1) : (0 << 1), 1 << 1);
1225         max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1226                         (1 << 1) : (0 << 1), 1 << 1);
1227         max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1228                         (1 << 1) : (0 << 1), 1 << 1);
1229
1230         /* Misc Settings */
1231         max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1232         max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1233
1234         for (i = 0; i < pdata->num_regulators; i++) {
1235                 const struct voltage_map_desc *desc;
1236                 int id = pdata->regulators[i].id;
1237
1238                 desc = reg_voltage_map[id];
1239                 if (desc)
1240                         regulators[id].n_voltages =
1241                                 (desc->max - desc->min) / desc->step + 1;
1242                 else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2)
1243                         regulators[id].n_voltages = 4;
1244                 else if (id == MAX8997_CHARGER_CV)
1245                         regulators[id].n_voltages = 16;
1246
1247                 config.dev = max8997->dev;
1248                 config.init_data = pdata->regulators[i].initdata;
1249                 config.driver_data = max8997;
1250                 config.of_node = pdata->regulators[i].reg_node;
1251
1252                 rdev[i] = regulator_register(&regulators[id], &config);
1253                 if (IS_ERR(rdev[i])) {
1254                         ret = PTR_ERR(rdev[i]);
1255                         dev_err(max8997->dev, "regulator init failed for %d\n",
1256                                         id);
1257                         rdev[i] = NULL;
1258                         goto err;
1259                 }
1260         }
1261
1262         return 0;
1263 err:
1264         while (--i >= 0)
1265                 regulator_unregister(rdev[i]);
1266 err_out:
1267         return ret;
1268 }
1269
1270 static int max8997_pmic_remove(struct platform_device *pdev)
1271 {
1272         struct max8997_data *max8997 = platform_get_drvdata(pdev);
1273         struct regulator_dev **rdev = max8997->rdev;
1274         int i;
1275
1276         for (i = 0; i < max8997->num_regulators; i++)
1277                 regulator_unregister(rdev[i]);
1278         return 0;
1279 }
1280
1281 static const struct platform_device_id max8997_pmic_id[] = {
1282         { "max8997-pmic", 0},
1283         { },
1284 };
1285 MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1286
1287 static struct platform_driver max8997_pmic_driver = {
1288         .driver = {
1289                 .name = "max8997-pmic",
1290                 .owner = THIS_MODULE,
1291         },
1292         .probe = max8997_pmic_probe,
1293         .remove = max8997_pmic_remove,
1294         .id_table = max8997_pmic_id,
1295 };
1296
1297 static int __init max8997_pmic_init(void)
1298 {
1299         return platform_driver_register(&max8997_pmic_driver);
1300 }
1301 subsys_initcall(max8997_pmic_init);
1302
1303 static void __exit max8997_pmic_cleanup(void)
1304 {
1305         platform_driver_unregister(&max8997_pmic_driver);
1306 }
1307 module_exit(max8997_pmic_cleanup);
1308
1309 MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1310 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1311 MODULE_LICENSE("GPL");