root/include/linux/regulator/consumer.h

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INCLUDED FROM

DEFINITIONS

This source file includes following definitions.
  1. regulator_get
  2. devm_regulator_get
  3. regulator_get_exclusive
  4. regulator_get_optional
  5. devm_regulator_get_optional
  6. regulator_put
  7. devm_regulator_put
  8. regulator_register_supply_alias
  9. regulator_unregister_supply_alias
  10. regulator_bulk_register_supply_alias
  11. regulator_bulk_unregister_supply_alias
  12. devm_regulator_register_supply_alias
  13. devm_regulator_unregister_supply_alias
  14. devm_regulator_bulk_register_supply_alias
  15. devm_regulator_bulk_unregister_supply_alias
  16. regulator_enable
  17. regulator_disable
  18. regulator_force_disable
  19. regulator_disable_deferred
  20. regulator_is_enabled
  21. regulator_bulk_get
  22. devm_regulator_bulk_get
  23. regulator_bulk_enable
  24. regulator_bulk_disable
  25. regulator_bulk_force_disable
  26. regulator_bulk_free
  27. regulator_set_voltage
  28. regulator_set_voltage_time
  29. regulator_get_voltage
  30. regulator_is_supported_voltage
  31. regulator_get_linear_step
  32. regulator_set_current_limit
  33. regulator_get_current_limit
  34. regulator_set_mode
  35. regulator_get_mode
  36. regulator_get_error_flags
  37. regulator_set_load
  38. regulator_allow_bypass
  39. regulator_get_regmap
  40. regulator_get_hardware_vsel_register
  41. regulator_list_hardware_vsel
  42. regulator_register_notifier
  43. devm_regulator_register_notifier
  44. regulator_unregister_notifier
  45. devm_regulator_unregister_notifier
  46. regulator_get_drvdata
  47. regulator_set_drvdata
  48. regulator_count_voltages
  49. regulator_list_voltage
  50. regulator_bulk_set_supply_names
  51. regulator_is_equal
  52. regulator_set_voltage_triplet
  53. regulator_set_voltage_tol
  54. regulator_is_supported_voltage_tol
   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * consumer.h -- SoC Regulator consumer support.
   4  *
   5  * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
   6  *
   7  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   8  *
   9  * Regulator Consumer Interface.
  10  *
  11  * A Power Management Regulator framework for SoC based devices.
  12  * Features:-
  13  *   o Voltage and current level control.
  14  *   o Operating mode control.
  15  *   o Regulator status.
  16  *   o sysfs entries for showing client devices and status
  17  *
  18  * EXPERIMENTAL FEATURES:
  19  *   Dynamic Regulator operating Mode Switching (DRMS) - allows regulators
  20  *   to use most efficient operating mode depending upon voltage and load and
  21  *   is transparent to client drivers.
  22  *
  23  *   e.g. Devices x,y,z share regulator r. Device x and y draw 20mA each during
  24  *   IO and 1mA at idle. Device z draws 100mA when under load and 5mA when
  25  *   idling. Regulator r has > 90% efficiency in NORMAL mode at loads > 100mA
  26  *   but this drops rapidly to 60% when below 100mA. Regulator r has > 90%
  27  *   efficiency in IDLE mode at loads < 10mA. Thus regulator r will operate
  28  *   in normal mode for loads > 10mA and in IDLE mode for load <= 10mA.
  29  */
  30 
  31 #ifndef __LINUX_REGULATOR_CONSUMER_H_
  32 #define __LINUX_REGULATOR_CONSUMER_H_
  33 
  34 #include <linux/err.h>
  35 
  36 struct device;
  37 struct notifier_block;
  38 struct regmap;
  39 
  40 /*
  41  * Regulator operating modes.
  42  *
  43  * Regulators can run in a variety of different operating modes depending on
  44  * output load. This allows further system power savings by selecting the
  45  * best (and most efficient) regulator mode for a desired load.
  46  *
  47  * Most drivers will only care about NORMAL. The modes below are generic and
  48  * will probably not match the naming convention of your regulator data sheet
  49  * but should match the use cases in the datasheet.
  50  *
  51  * In order of power efficiency (least efficient at top).
  52  *
  53  *  Mode       Description
  54  *  FAST       Regulator can handle fast changes in it's load.
  55  *             e.g. useful in CPU voltage & frequency scaling where
  56  *             load can quickly increase with CPU frequency increases.
  57  *
  58  *  NORMAL     Normal regulator power supply mode. Most drivers will
  59  *             use this mode.
  60  *
  61  *  IDLE       Regulator runs in a more efficient mode for light
  62  *             loads. Can be used for devices that have a low power
  63  *             requirement during periods of inactivity. This mode
  64  *             may be more noisy than NORMAL and may not be able
  65  *             to handle fast load switching.
  66  *
  67  *  STANDBY    Regulator runs in the most efficient mode for very
  68  *             light loads. Can be used by devices when they are
  69  *             in a sleep/standby state. This mode is likely to be
  70  *             the most noisy and may not be able to handle fast load
  71  *             switching.
  72  *
  73  * NOTE: Most regulators will only support a subset of these modes. Some
  74  * will only just support NORMAL.
  75  *
  76  * These modes can be OR'ed together to make up a mask of valid register modes.
  77  */
  78 
  79 #define REGULATOR_MODE_INVALID                  0x0
  80 #define REGULATOR_MODE_FAST                     0x1
  81 #define REGULATOR_MODE_NORMAL                   0x2
  82 #define REGULATOR_MODE_IDLE                     0x4
  83 #define REGULATOR_MODE_STANDBY                  0x8
  84 
  85 /*
  86  * Regulator notifier events.
  87  *
  88  * UNDER_VOLTAGE  Regulator output is under voltage.
  89  * OVER_CURRENT   Regulator output current is too high.
  90  * REGULATION_OUT Regulator output is out of regulation.
  91  * FAIL           Regulator output has failed.
  92  * OVER_TEMP      Regulator over temp.
  93  * FORCE_DISABLE  Regulator forcibly shut down by software.
  94  * VOLTAGE_CHANGE Regulator voltage changed.
  95  *                Data passed is old voltage cast to (void *).
  96  * DISABLE        Regulator was disabled.
  97  * PRE_VOLTAGE_CHANGE   Regulator is about to have voltage changed.
  98  *                      Data passed is "struct pre_voltage_change_data"
  99  * ABORT_VOLTAGE_CHANGE Regulator voltage change failed for some reason.
 100  *                      Data passed is old voltage cast to (void *).
 101  * PRE_DISABLE    Regulator is about to be disabled
 102  * ABORT_DISABLE  Regulator disable failed for some reason
 103  *
 104  * NOTE: These events can be OR'ed together when passed into handler.
 105  */
 106 
 107 #define REGULATOR_EVENT_UNDER_VOLTAGE           0x01
 108 #define REGULATOR_EVENT_OVER_CURRENT            0x02
 109 #define REGULATOR_EVENT_REGULATION_OUT          0x04
 110 #define REGULATOR_EVENT_FAIL                    0x08
 111 #define REGULATOR_EVENT_OVER_TEMP               0x10
 112 #define REGULATOR_EVENT_FORCE_DISABLE           0x20
 113 #define REGULATOR_EVENT_VOLTAGE_CHANGE          0x40
 114 #define REGULATOR_EVENT_DISABLE                 0x80
 115 #define REGULATOR_EVENT_PRE_VOLTAGE_CHANGE      0x100
 116 #define REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE    0x200
 117 #define REGULATOR_EVENT_PRE_DISABLE             0x400
 118 #define REGULATOR_EVENT_ABORT_DISABLE           0x800
 119 #define REGULATOR_EVENT_ENABLE                  0x1000
 120 
 121 /*
 122  * Regulator errors that can be queried using regulator_get_error_flags
 123  *
 124  * UNDER_VOLTAGE  Regulator output is under voltage.
 125  * OVER_CURRENT   Regulator output current is too high.
 126  * REGULATION_OUT Regulator output is out of regulation.
 127  * FAIL           Regulator output has failed.
 128  * OVER_TEMP      Regulator over temp.
 129  *
 130  * NOTE: These errors can be OR'ed together.
 131  */
 132 
 133 #define REGULATOR_ERROR_UNDER_VOLTAGE           BIT(1)
 134 #define REGULATOR_ERROR_OVER_CURRENT            BIT(2)
 135 #define REGULATOR_ERROR_REGULATION_OUT          BIT(3)
 136 #define REGULATOR_ERROR_FAIL                    BIT(4)
 137 #define REGULATOR_ERROR_OVER_TEMP               BIT(5)
 138 
 139 
 140 /**
 141  * struct pre_voltage_change_data - Data sent with PRE_VOLTAGE_CHANGE event
 142  *
 143  * @old_uV: Current voltage before change.
 144  * @min_uV: Min voltage we'll change to.
 145  * @max_uV: Max voltage we'll change to.
 146  */
 147 struct pre_voltage_change_data {
 148         unsigned long old_uV;
 149         unsigned long min_uV;
 150         unsigned long max_uV;
 151 };
 152 
 153 struct regulator;
 154 
 155 /**
 156  * struct regulator_bulk_data - Data used for bulk regulator operations.
 157  *
 158  * @supply:   The name of the supply.  Initialised by the user before
 159  *            using the bulk regulator APIs.
 160  * @consumer: The regulator consumer for the supply.  This will be managed
 161  *            by the bulk API.
 162  *
 163  * The regulator APIs provide a series of regulator_bulk_() API calls as
 164  * a convenience to consumers which require multiple supplies.  This
 165  * structure is used to manage data for these calls.
 166  */
 167 struct regulator_bulk_data {
 168         const char *supply;
 169         struct regulator *consumer;
 170 
 171         /* private: Internal use */
 172         int ret;
 173 };
 174 
 175 #if defined(CONFIG_REGULATOR)
 176 
 177 /* regulator get and put */
 178 struct regulator *__must_check regulator_get(struct device *dev,
 179                                              const char *id);
 180 struct regulator *__must_check devm_regulator_get(struct device *dev,
 181                                              const char *id);
 182 struct regulator *__must_check regulator_get_exclusive(struct device *dev,
 183                                                        const char *id);
 184 struct regulator *__must_check devm_regulator_get_exclusive(struct device *dev,
 185                                                         const char *id);
 186 struct regulator *__must_check regulator_get_optional(struct device *dev,
 187                                                       const char *id);
 188 struct regulator *__must_check devm_regulator_get_optional(struct device *dev,
 189                                                            const char *id);
 190 void regulator_put(struct regulator *regulator);
 191 void devm_regulator_put(struct regulator *regulator);
 192 
 193 int regulator_register_supply_alias(struct device *dev, const char *id,
 194                                     struct device *alias_dev,
 195                                     const char *alias_id);
 196 void regulator_unregister_supply_alias(struct device *dev, const char *id);
 197 
 198 int regulator_bulk_register_supply_alias(struct device *dev,
 199                                          const char *const *id,
 200                                          struct device *alias_dev,
 201                                          const char *const *alias_id,
 202                                          int num_id);
 203 void regulator_bulk_unregister_supply_alias(struct device *dev,
 204                                             const char * const *id, int num_id);
 205 
 206 int devm_regulator_register_supply_alias(struct device *dev, const char *id,
 207                                          struct device *alias_dev,
 208                                          const char *alias_id);
 209 void devm_regulator_unregister_supply_alias(struct device *dev,
 210                                             const char *id);
 211 
 212 int devm_regulator_bulk_register_supply_alias(struct device *dev,
 213                                               const char *const *id,
 214                                               struct device *alias_dev,
 215                                               const char *const *alias_id,
 216                                               int num_id);
 217 void devm_regulator_bulk_unregister_supply_alias(struct device *dev,
 218                                                  const char *const *id,
 219                                                  int num_id);
 220 
 221 /* regulator output control and status */
 222 int __must_check regulator_enable(struct regulator *regulator);
 223 int regulator_disable(struct regulator *regulator);
 224 int regulator_force_disable(struct regulator *regulator);
 225 int regulator_is_enabled(struct regulator *regulator);
 226 int regulator_disable_deferred(struct regulator *regulator, int ms);
 227 
 228 int __must_check regulator_bulk_get(struct device *dev, int num_consumers,
 229                                     struct regulator_bulk_data *consumers);
 230 int __must_check devm_regulator_bulk_get(struct device *dev, int num_consumers,
 231                                          struct regulator_bulk_data *consumers);
 232 int __must_check regulator_bulk_enable(int num_consumers,
 233                                        struct regulator_bulk_data *consumers);
 234 int regulator_bulk_disable(int num_consumers,
 235                            struct regulator_bulk_data *consumers);
 236 int regulator_bulk_force_disable(int num_consumers,
 237                            struct regulator_bulk_data *consumers);
 238 void regulator_bulk_free(int num_consumers,
 239                          struct regulator_bulk_data *consumers);
 240 
 241 int regulator_count_voltages(struct regulator *regulator);
 242 int regulator_list_voltage(struct regulator *regulator, unsigned selector);
 243 int regulator_is_supported_voltage(struct regulator *regulator,
 244                                    int min_uV, int max_uV);
 245 unsigned int regulator_get_linear_step(struct regulator *regulator);
 246 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
 247 int regulator_set_voltage_time(struct regulator *regulator,
 248                                int old_uV, int new_uV);
 249 int regulator_get_voltage(struct regulator *regulator);
 250 int regulator_sync_voltage(struct regulator *regulator);
 251 int regulator_set_current_limit(struct regulator *regulator,
 252                                int min_uA, int max_uA);
 253 int regulator_get_current_limit(struct regulator *regulator);
 254 
 255 int regulator_set_mode(struct regulator *regulator, unsigned int mode);
 256 unsigned int regulator_get_mode(struct regulator *regulator);
 257 int regulator_get_error_flags(struct regulator *regulator,
 258                                 unsigned int *flags);
 259 int regulator_set_load(struct regulator *regulator, int load_uA);
 260 
 261 int regulator_allow_bypass(struct regulator *regulator, bool allow);
 262 
 263 struct regmap *regulator_get_regmap(struct regulator *regulator);
 264 int regulator_get_hardware_vsel_register(struct regulator *regulator,
 265                                          unsigned *vsel_reg,
 266                                          unsigned *vsel_mask);
 267 int regulator_list_hardware_vsel(struct regulator *regulator,
 268                                  unsigned selector);
 269 
 270 /* regulator notifier block */
 271 int regulator_register_notifier(struct regulator *regulator,
 272                               struct notifier_block *nb);
 273 int devm_regulator_register_notifier(struct regulator *regulator,
 274                                      struct notifier_block *nb);
 275 int regulator_unregister_notifier(struct regulator *regulator,
 276                                 struct notifier_block *nb);
 277 void devm_regulator_unregister_notifier(struct regulator *regulator,
 278                                         struct notifier_block *nb);
 279 
 280 /* driver data - core doesn't touch */
 281 void *regulator_get_drvdata(struct regulator *regulator);
 282 void regulator_set_drvdata(struct regulator *regulator, void *data);
 283 
 284 /* misc helpers */
 285 
 286 void regulator_bulk_set_supply_names(struct regulator_bulk_data *consumers,
 287                                      const char *const *supply_names,
 288                                      unsigned int num_supplies);
 289 
 290 bool regulator_is_equal(struct regulator *reg1, struct regulator *reg2);
 291 
 292 #else
 293 
 294 /*
 295  * Make sure client drivers will still build on systems with no software
 296  * controllable voltage or current regulators.
 297  */
 298 static inline struct regulator *__must_check regulator_get(struct device *dev,
 299         const char *id)
 300 {
 301         /* Nothing except the stubbed out regulator API should be
 302          * looking at the value except to check if it is an error
 303          * value. Drivers are free to handle NULL specifically by
 304          * skipping all regulator API calls, but they don't have to.
 305          * Drivers which don't, should make sure they properly handle
 306          * corner cases of the API, such as regulator_get_voltage()
 307          * returning 0.
 308          */
 309         return NULL;
 310 }
 311 
 312 static inline struct regulator *__must_check
 313 devm_regulator_get(struct device *dev, const char *id)
 314 {
 315         return NULL;
 316 }
 317 
 318 static inline struct regulator *__must_check
 319 regulator_get_exclusive(struct device *dev, const char *id)
 320 {
 321         return ERR_PTR(-ENODEV);
 322 }
 323 
 324 static inline struct regulator *__must_check
 325 regulator_get_optional(struct device *dev, const char *id)
 326 {
 327         return ERR_PTR(-ENODEV);
 328 }
 329 
 330 
 331 static inline struct regulator *__must_check
 332 devm_regulator_get_optional(struct device *dev, const char *id)
 333 {
 334         return ERR_PTR(-ENODEV);
 335 }
 336 
 337 static inline void regulator_put(struct regulator *regulator)
 338 {
 339 }
 340 
 341 static inline void devm_regulator_put(struct regulator *regulator)
 342 {
 343 }
 344 
 345 static inline int regulator_register_supply_alias(struct device *dev,
 346                                                   const char *id,
 347                                                   struct device *alias_dev,
 348                                                   const char *alias_id)
 349 {
 350         return 0;
 351 }
 352 
 353 static inline void regulator_unregister_supply_alias(struct device *dev,
 354                                                     const char *id)
 355 {
 356 }
 357 
 358 static inline int regulator_bulk_register_supply_alias(struct device *dev,
 359                                                 const char *const *id,
 360                                                 struct device *alias_dev,
 361                                                 const char * const *alias_id,
 362                                                 int num_id)
 363 {
 364         return 0;
 365 }
 366 
 367 static inline void regulator_bulk_unregister_supply_alias(struct device *dev,
 368                                                 const char * const *id,
 369                                                 int num_id)
 370 {
 371 }
 372 
 373 static inline int devm_regulator_register_supply_alias(struct device *dev,
 374                                                        const char *id,
 375                                                        struct device *alias_dev,
 376                                                        const char *alias_id)
 377 {
 378         return 0;
 379 }
 380 
 381 static inline void devm_regulator_unregister_supply_alias(struct device *dev,
 382                                                           const char *id)
 383 {
 384 }
 385 
 386 static inline int devm_regulator_bulk_register_supply_alias(struct device *dev,
 387                                                 const char *const *id,
 388                                                 struct device *alias_dev,
 389                                                 const char *const *alias_id,
 390                                                 int num_id)
 391 {
 392         return 0;
 393 }
 394 
 395 static inline void devm_regulator_bulk_unregister_supply_alias(
 396         struct device *dev, const char *const *id, int num_id)
 397 {
 398 }
 399 
 400 static inline int regulator_enable(struct regulator *regulator)
 401 {
 402         return 0;
 403 }
 404 
 405 static inline int regulator_disable(struct regulator *regulator)
 406 {
 407         return 0;
 408 }
 409 
 410 static inline int regulator_force_disable(struct regulator *regulator)
 411 {
 412         return 0;
 413 }
 414 
 415 static inline int regulator_disable_deferred(struct regulator *regulator,
 416                                              int ms)
 417 {
 418         return 0;
 419 }
 420 
 421 static inline int regulator_is_enabled(struct regulator *regulator)
 422 {
 423         return 1;
 424 }
 425 
 426 static inline int regulator_bulk_get(struct device *dev,
 427                                      int num_consumers,
 428                                      struct regulator_bulk_data *consumers)
 429 {
 430         return 0;
 431 }
 432 
 433 static inline int devm_regulator_bulk_get(struct device *dev, int num_consumers,
 434                                           struct regulator_bulk_data *consumers)
 435 {
 436         return 0;
 437 }
 438 
 439 static inline int regulator_bulk_enable(int num_consumers,
 440                                         struct regulator_bulk_data *consumers)
 441 {
 442         return 0;
 443 }
 444 
 445 static inline int regulator_bulk_disable(int num_consumers,
 446                                          struct regulator_bulk_data *consumers)
 447 {
 448         return 0;
 449 }
 450 
 451 static inline int regulator_bulk_force_disable(int num_consumers,
 452                                         struct regulator_bulk_data *consumers)
 453 {
 454         return 0;
 455 }
 456 
 457 static inline void regulator_bulk_free(int num_consumers,
 458                                        struct regulator_bulk_data *consumers)
 459 {
 460 }
 461 
 462 static inline int regulator_set_voltage(struct regulator *regulator,
 463                                         int min_uV, int max_uV)
 464 {
 465         return 0;
 466 }
 467 
 468 static inline int regulator_set_voltage_time(struct regulator *regulator,
 469                                              int old_uV, int new_uV)
 470 {
 471         return 0;
 472 }
 473 
 474 static inline int regulator_get_voltage(struct regulator *regulator)
 475 {
 476         return -EINVAL;
 477 }
 478 
 479 static inline int regulator_is_supported_voltage(struct regulator *regulator,
 480                                    int min_uV, int max_uV)
 481 {
 482         return 0;
 483 }
 484 
 485 static inline unsigned int regulator_get_linear_step(struct regulator *regulator)
 486 {
 487         return 0;
 488 }
 489 
 490 static inline int regulator_set_current_limit(struct regulator *regulator,
 491                                              int min_uA, int max_uA)
 492 {
 493         return 0;
 494 }
 495 
 496 static inline int regulator_get_current_limit(struct regulator *regulator)
 497 {
 498         return 0;
 499 }
 500 
 501 static inline int regulator_set_mode(struct regulator *regulator,
 502         unsigned int mode)
 503 {
 504         return 0;
 505 }
 506 
 507 static inline unsigned int regulator_get_mode(struct regulator *regulator)
 508 {
 509         return REGULATOR_MODE_NORMAL;
 510 }
 511 
 512 static inline int regulator_get_error_flags(struct regulator *regulator,
 513                                             unsigned int *flags)
 514 {
 515         return -EINVAL;
 516 }
 517 
 518 static inline int regulator_set_load(struct regulator *regulator, int load_uA)
 519 {
 520         return 0;
 521 }
 522 
 523 static inline int regulator_allow_bypass(struct regulator *regulator,
 524                                          bool allow)
 525 {
 526         return 0;
 527 }
 528 
 529 static inline struct regmap *regulator_get_regmap(struct regulator *regulator)
 530 {
 531         return ERR_PTR(-EOPNOTSUPP);
 532 }
 533 
 534 static inline int regulator_get_hardware_vsel_register(struct regulator *regulator,
 535                                                        unsigned *vsel_reg,
 536                                                        unsigned *vsel_mask)
 537 {
 538         return -EOPNOTSUPP;
 539 }
 540 
 541 static inline int regulator_list_hardware_vsel(struct regulator *regulator,
 542                                                unsigned selector)
 543 {
 544         return -EOPNOTSUPP;
 545 }
 546 
 547 static inline int regulator_register_notifier(struct regulator *regulator,
 548                               struct notifier_block *nb)
 549 {
 550         return 0;
 551 }
 552 
 553 static inline int devm_regulator_register_notifier(struct regulator *regulator,
 554                                                    struct notifier_block *nb)
 555 {
 556         return 0;
 557 }
 558 
 559 static inline int regulator_unregister_notifier(struct regulator *regulator,
 560                                 struct notifier_block *nb)
 561 {
 562         return 0;
 563 }
 564 
 565 static inline int devm_regulator_unregister_notifier(struct regulator *regulator,
 566                                                      struct notifier_block *nb)
 567 {
 568         return 0;
 569 }
 570 
 571 static inline void *regulator_get_drvdata(struct regulator *regulator)
 572 {
 573         return NULL;
 574 }
 575 
 576 static inline void regulator_set_drvdata(struct regulator *regulator,
 577         void *data)
 578 {
 579 }
 580 
 581 static inline int regulator_count_voltages(struct regulator *regulator)
 582 {
 583         return 0;
 584 }
 585 
 586 static inline int regulator_list_voltage(struct regulator *regulator, unsigned selector)
 587 {
 588         return -EINVAL;
 589 }
 590 
 591 static inline void
 592 regulator_bulk_set_supply_names(struct regulator_bulk_data *consumers,
 593                                 const char *const *supply_names,
 594                                 unsigned int num_supplies)
 595 {
 596 }
 597 
 598 static inline bool
 599 regulator_is_equal(struct regulator *reg1, struct regulator *reg2)
 600 {
 601         return false;
 602 }
 603 #endif
 604 
 605 static inline int regulator_set_voltage_triplet(struct regulator *regulator,
 606                                                 int min_uV, int target_uV,
 607                                                 int max_uV)
 608 {
 609         if (regulator_set_voltage(regulator, target_uV, max_uV) == 0)
 610                 return 0;
 611 
 612         return regulator_set_voltage(regulator, min_uV, max_uV);
 613 }
 614 
 615 static inline int regulator_set_voltage_tol(struct regulator *regulator,
 616                                             int new_uV, int tol_uV)
 617 {
 618         if (regulator_set_voltage(regulator, new_uV, new_uV + tol_uV) == 0)
 619                 return 0;
 620         else
 621                 return regulator_set_voltage(regulator,
 622                                              new_uV - tol_uV, new_uV + tol_uV);
 623 }
 624 
 625 static inline int regulator_is_supported_voltage_tol(struct regulator *regulator,
 626                                                      int target_uV, int tol_uV)
 627 {
 628         return regulator_is_supported_voltage(regulator,
 629                                               target_uV - tol_uV,
 630                                               target_uV + tol_uV);
 631 }
 632 
 633 #endif
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