drivers/pinctrl/samsung/pinctrl-samsung.c

   1 /*
   2  * pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's.
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com
   6  * Copyright (c) 2012 Linaro Ltd
   7  *              http://www.linaro.org
   8  *
   9  * Author: Thomas Abraham <thomas.ab@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 driver implements the Samsung pinctrl driver. It supports setting up of
  17  * pinmux and pinconf configurations. The gpiolib interface is also included.
  18  * External interrupt (gpio and wakeup) support are not included in this driver
  19  * but provides extensions to which platform specific implementation of the gpio
  20  * and wakeup interrupts can be hooked to.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/io.h>
  26 #include <linux/slab.h>
  27 #include <linux/err.h>
  28 #include <linux/gpio.h>
  29 #include <linux/irqdomain.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/syscore_ops.h>
  32
  33 #include "../core.h"
  34 #include "pinctrl-samsung.h"
  35
  36 /* list of all possible config options supported */
  37 static struct pin_config {
  38         const char *property;
  39         enum pincfg_type param;
  40 } cfg_params[] = {
  41         { "samsung,pin-pud", PINCFG_TYPE_PUD },
  42         { "samsung,pin-drv", PINCFG_TYPE_DRV },
  43         { "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
  44         { "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
  45         { "samsung,pin-val", PINCFG_TYPE_DAT },
  46 };
  47
  48 /* Global list of devices (struct samsung_pinctrl_drv_data) */
  49 static LIST_HEAD(drvdata_list);
  50
  51 static unsigned int pin_base;
  52
  53 static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc)
  54 {
  55         return container_of(gc, struct samsung_pin_bank, gpio_chip);
  56 }
  57
  58 static int samsung_get_group_count(struct pinctrl_dev *pctldev)
  59 {
  60         struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
  61
  62         return pmx->nr_groups;
  63 }
  64
  65 static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
  66                                                 unsigned group)
  67 {
  68         struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
  69
  70         return pmx->pin_groups[group].name;
  71 }
  72
  73 static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
  74                                         unsigned group,
  75                                         const unsigned **pins,
  76                                         unsigned *num_pins)
  77 {
  78         struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
  79
  80         *pins = pmx->pin_groups[group].pins;
  81         *num_pins = pmx->pin_groups[group].num_pins;
  82
  83         return 0;
  84 }
  85
  86 static int reserve_map(struct device *dev, struct pinctrl_map **map,
  87                        unsigned *reserved_maps, unsigned *num_maps,
  88                        unsigned reserve)
  89 {
  90         unsigned old_num = *reserved_maps;
  91         unsigned new_num = *num_maps + reserve;
  92         struct pinctrl_map *new_map;
  93
  94         if (old_num >= new_num)
  95                 return 0;
  96
  97         new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
  98         if (!new_map) {
  99                 dev_err(dev, "krealloc(map) failed\n");
 100                 return -ENOMEM;
 101         }
 102
 103         memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
 104
 105         *map = new_map;
 106         *reserved_maps = new_num;
 107
 108         return 0;
 109 }
 110
 111 static int add_map_mux(struct pinctrl_map **map, unsigned *reserved_maps,
 112                        unsigned *num_maps, const char *group,
 113                        const char *function)
 114 {
 115         if (WARN_ON(*num_maps == *reserved_maps))
 116                 return -ENOSPC;
 117
 118         (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
 119         (*map)[*num_maps].data.mux.group = group;
 120         (*map)[*num_maps].data.mux.function = function;
 121         (*num_maps)++;
 122
 123         return 0;
 124 }
 125
 126 static int add_map_configs(struct device *dev, struct pinctrl_map **map,
 127                            unsigned *reserved_maps, unsigned *num_maps,
 128                            const char *group, unsigned long *configs,
 129                            unsigned num_configs)
 130 {
 131         unsigned long *dup_configs;
 132
 133         if (WARN_ON(*num_maps == *reserved_maps))
 134                 return -ENOSPC;
 135
 136         dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
 137                               GFP_KERNEL);
 138         if (!dup_configs) {
 139                 dev_err(dev, "kmemdup(configs) failed\n");
 140                 return -ENOMEM;
 141         }
 142
 143         (*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
 144         (*map)[*num_maps].data.configs.group_or_pin = group;
 145         (*map)[*num_maps].data.configs.configs = dup_configs;
 146         (*map)[*num_maps].data.configs.num_configs = num_configs;
 147         (*num_maps)++;
 148
 149         return 0;
 150 }
 151
 152 static int add_config(struct device *dev, unsigned long **configs,
 153                       unsigned *num_configs, unsigned long config)
 154 {
 155         unsigned old_num = *num_configs;
 156         unsigned new_num = old_num + 1;
 157         unsigned long *new_configs;
 158
 159         new_configs = krealloc(*configs, sizeof(*new_configs) * new_num,
 160                                GFP_KERNEL);
 161         if (!new_configs) {
 162                 dev_err(dev, "krealloc(configs) failed\n");
 163                 return -ENOMEM;
 164         }
 165
 166         new_configs[old_num] = config;
 167
 168         *configs = new_configs;
 169         *num_configs = new_num;
 170
 171         return 0;
 172 }
 173
 174 static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
 175                                       struct pinctrl_map *map,
 176                                       unsigned num_maps)
 177 {
 178         int i;
 179
 180         for (i = 0; i < num_maps; i++)
 181                 if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
 182                         kfree(map[i].data.configs.configs);
 183
 184         kfree(map);
 185 }
 186
 187 static int samsung_dt_subnode_to_map(struct samsung_pinctrl_drv_data *drvdata,
 188                                      struct device *dev,
 189                                      struct device_node *np,
 190                                      struct pinctrl_map **map,
 191                                      unsigned *reserved_maps,
 192                                      unsigned *num_maps)
 193 {
 194         int ret, i;
 195         u32 val;
 196         unsigned long config;
 197         unsigned long *configs = NULL;
 198         unsigned num_configs = 0;
 199         unsigned reserve;
 200         struct property *prop;
 201         const char *group;
 202         bool has_func = false;
 203
 204         ret = of_property_read_u32(np, "samsung,pin-function", &val);
 205         if (!ret)
 206                 has_func = true;
 207
 208         for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
 209                 ret = of_property_read_u32(np, cfg_params[i].property, &val);
 210                 if (!ret) {
 211                         config = PINCFG_PACK(cfg_params[i].param, val);
 212                         ret = add_config(dev, &configs, &num_configs, config);
 213                         if (ret < 0)
 214                                 goto exit;
 215                 /* EINVAL=missing, which is fine since it's optional */
 216                 } else if (ret != -EINVAL) {
 217                         dev_err(dev, "could not parse property %s\n",
 218                                 cfg_params[i].property);
 219                 }
 220         }
 221
 222         reserve = 0;
 223         if (has_func)
 224                 reserve++;
 225         if (num_configs)
 226                 reserve++;
 227         ret = of_property_count_strings(np, "samsung,pins");
 228         if (ret < 0) {
 229                 dev_err(dev, "could not parse property samsung,pins\n");
 230                 goto exit;
 231         }
 232         reserve *= ret;
 233
 234         ret = reserve_map(dev, map, reserved_maps, num_maps, reserve);
 235         if (ret < 0)
 236                 goto exit;
 237
 238         of_property_for_each_string(np, "samsung,pins", prop, group) {
 239                 if (has_func) {
 240                         ret = add_map_mux(map, reserved_maps,
 241                                                 num_maps, group, np->full_name);
 242                         if (ret < 0)
 243                                 goto exit;
 244                 }
 245
 246                 if (num_configs) {
 247                         ret = add_map_configs(dev, map, reserved_maps,
 248                                               num_maps, group, configs,
 249                                               num_configs);
 250                         if (ret < 0)
 251                                 goto exit;
 252                 }
 253         }
 254
 255         ret = 0;
 256
 257 exit:
 258         kfree(configs);
 259         return ret;
 260 }
 261
 262 static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
 263                                         struct device_node *np_config,
 264                                         struct pinctrl_map **map,
 265                                         unsigned *num_maps)
 266 {
 267         struct samsung_pinctrl_drv_data *drvdata;
 268         unsigned reserved_maps;
 269         struct device_node *np;
 270         int ret;
 271
 272         drvdata = pinctrl_dev_get_drvdata(pctldev);
 273
 274         reserved_maps = 0;
 275         *map = NULL;
 276         *num_maps = 0;
 277
 278         if (!of_get_child_count(np_config))
 279                 return samsung_dt_subnode_to_map(drvdata, pctldev->dev,
 280                                                         np_config, map,
 281                                                         &reserved_maps,
 282                                                         num_maps);
 283
 284         for_each_child_of_node(np_config, np) {
 285                 ret = samsung_dt_subnode_to_map(drvdata, pctldev->dev, np, map,
 286                                                 &reserved_maps, num_maps);
 287                 if (ret < 0) {
 288                         samsung_dt_free_map(pctldev, *map, *num_maps);
 289                         return ret;
 290                 }
 291         }
 292
 293         return 0;
 294 }
 295
 296 /* list of pinctrl callbacks for the pinctrl core */
 297 static const struct pinctrl_ops samsung_pctrl_ops = {
 298         .get_groups_count       = samsung_get_group_count,
 299         .get_group_name         = samsung_get_group_name,
 300         .get_group_pins         = samsung_get_group_pins,
 301         .dt_node_to_map         = samsung_dt_node_to_map,
 302         .dt_free_map            = samsung_dt_free_map,
 303 };
 304
 305 /* check if the selector is a valid pin function selector */
 306 static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
 307 {
 308         struct samsung_pinctrl_drv_data *drvdata;
 309
 310         drvdata = pinctrl_dev_get_drvdata(pctldev);
 311         return drvdata->nr_functions;
 312 }
 313
 314 /* return the name of the pin function specified */
 315 static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
 316                                                 unsigned selector)
 317 {
 318         struct samsung_pinctrl_drv_data *drvdata;
 319
 320         drvdata = pinctrl_dev_get_drvdata(pctldev);
 321         return drvdata->pmx_functions[selector].name;
 322 }
 323
 324 /* return the groups associated for the specified function selector */
 325 static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
 326                 unsigned selector, const char * const **groups,
 327                 unsigned * const num_groups)
 328 {
 329         struct samsung_pinctrl_drv_data *drvdata;
 330
 331         drvdata = pinctrl_dev_get_drvdata(pctldev);
 332         *groups = drvdata->pmx_functions[selector].groups;
 333         *num_groups = drvdata->pmx_functions[selector].num_groups;
 334         return 0;
 335 }
 336
 337 /*
 338  * given a pin number that is local to a pin controller, find out the pin bank
 339  * and the register base of the pin bank.
 340  */
 341 static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata,
 342                         unsigned pin, void __iomem **reg, u32 *offset,
 343                         struct samsung_pin_bank **bank)
 344 {
 345         struct samsung_pin_bank *b;
 346
 347         b = drvdata->pin_banks;
 348
 349         while ((pin >= b->pin_base) &&
 350                         ((b->pin_base + b->nr_pins - 1) < pin))
 351                 b++;
 352
 353         *reg = drvdata->virt_base + b->pctl_offset;
 354         *offset = pin - b->pin_base;
 355         if (bank)
 356                 *bank = b;
 357 }
 358
 359 /* enable or disable a pinmux function */
 360 static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
 361                                         unsigned group, bool enable)
 362 {
 363         struct samsung_pinctrl_drv_data *drvdata;
 364         const struct samsung_pin_bank_type *type;
 365         struct samsung_pin_bank *bank;
 366         void __iomem *reg;
 367         u32 mask, shift, data, pin_offset;
 368         unsigned long flags;
 369         const struct samsung_pmx_func *func;
 370         const struct samsung_pin_group *grp;
 371
 372         drvdata = pinctrl_dev_get_drvdata(pctldev);
 373         func = &drvdata->pmx_functions[selector];
 374         grp = &drvdata->pin_groups[group];
 375
 376         pin_to_reg_bank(drvdata, grp->pins[0] - drvdata->pin_base,
 377                         &reg, &pin_offset, &bank);
 378         type = bank->type;
 379         mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
 380         shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
 381         if (shift >= 32) {
 382                 /* Some banks have two config registers */
 383                 shift -= 32;
 384                 reg += 4;
 385         }
 386
 387         spin_lock_irqsave(&bank->slock, flags);
 388
 389         data = readl(reg + type->reg_offset[PINCFG_TYPE_FUNC]);
 390         data &= ~(mask << shift);
 391         if (enable)
 392                 data |= func->val << shift;
 393         writel(data, reg + type->reg_offset[PINCFG_TYPE_FUNC]);
 394
 395         spin_unlock_irqrestore(&bank->slock, flags);
 396 }
 397
 398 /* enable a specified pinmux by writing to registers */
 399 static int samsung_pinmux_set_mux(struct pinctrl_dev *pctldev,
 400                                   unsigned selector,
 401                                   unsigned group)
 402 {
 403         samsung_pinmux_setup(pctldev, selector, group, true);
 404         return 0;
 405 }
 406
 407 /* list of pinmux callbacks for the pinmux vertical in pinctrl core */
 408 static const struct pinmux_ops samsung_pinmux_ops = {
 409         .get_functions_count    = samsung_get_functions_count,
 410         .get_function_name      = samsung_pinmux_get_fname,
 411         .get_function_groups    = samsung_pinmux_get_groups,
 412         .set_mux                = samsung_pinmux_set_mux,
 413 };
 414
 415 /* set or get the pin config settings for a specified pin */
 416 static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
 417                                 unsigned long *config, bool set)
 418 {
 419         struct samsung_pinctrl_drv_data *drvdata;
 420         const struct samsung_pin_bank_type *type;
 421         struct samsung_pin_bank *bank;
 422         void __iomem *reg_base;
 423         enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
 424         u32 data, width, pin_offset, mask, shift;
 425         u32 cfg_value, cfg_reg;
 426         unsigned long flags;
 427
 428         drvdata = pinctrl_dev_get_drvdata(pctldev);
 429         pin_to_reg_bank(drvdata, pin - drvdata->pin_base, &reg_base,
 430                                         &pin_offset, &bank);
 431         type = bank->type;
 432
 433         if (cfg_type >= PINCFG_TYPE_NUM || !type->fld_width[cfg_type])
 434                 return -EINVAL;
 435
 436         width = type->fld_width[cfg_type];
 437         cfg_reg = type->reg_offset[cfg_type];
 438
 439         spin_lock_irqsave(&bank->slock, flags);
 440
 441         mask = (1 << width) - 1;
 442         shift = pin_offset * width;
 443         data = readl(reg_base + cfg_reg);
 444
 445         if (set) {
 446                 cfg_value = PINCFG_UNPACK_VALUE(*config);
 447                 data &= ~(mask << shift);
 448                 data |= (cfg_value << shift);
 449                 writel(data, reg_base + cfg_reg);
 450         } else {
 451                 data >>= shift;
 452                 data &= mask;
 453                 *config = PINCFG_PACK(cfg_type, data);
 454         }
 455
 456         spin_unlock_irqrestore(&bank->slock, flags);
 457
 458         return 0;
 459 }
 460
 461 /* set the pin config settings for a specified pin */
 462 static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 463                                 unsigned long *configs, unsigned num_configs)
 464 {
 465         int i, ret;
 466
 467         for (i = 0; i < num_configs; i++) {
 468                 ret = samsung_pinconf_rw(pctldev, pin, &configs[i], true);
 469                 if (ret < 0)
 470                         return ret;
 471         } /* for each config */
 472
 473         return 0;
 474 }
 475
 476 /* get the pin config settings for a specified pin */
 477 static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
 478                                         unsigned long *config)
 479 {
 480         return samsung_pinconf_rw(pctldev, pin, config, false);
 481 }
 482
 483 /* set the pin config settings for a specified pin group */
 484 static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
 485                         unsigned group, unsigned long *configs,
 486                         unsigned num_configs)
 487 {
 488         struct samsung_pinctrl_drv_data *drvdata;
 489         const unsigned int *pins;
 490         unsigned int cnt;
 491
 492         drvdata = pinctrl_dev_get_drvdata(pctldev);
 493         pins = drvdata->pin_groups[group].pins;
 494
 495         for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
 496                 samsung_pinconf_set(pctldev, pins[cnt], configs, num_configs);
 497
 498         return 0;
 499 }
 500
 501 /* get the pin config settings for a specified pin group */
 502 static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
 503                                 unsigned int group, unsigned long *config)
 504 {
 505         struct samsung_pinctrl_drv_data *drvdata;
 506         const unsigned int *pins;
 507
 508         drvdata = pinctrl_dev_get_drvdata(pctldev);
 509         pins = drvdata->pin_groups[group].pins;
 510         samsung_pinconf_get(pctldev, pins[0], config);
 511         return 0;
 512 }
 513
 514 /* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
 515 static const struct pinconf_ops samsung_pinconf_ops = {
 516         .pin_config_get         = samsung_pinconf_get,
 517         .pin_config_set         = samsung_pinconf_set,
 518         .pin_config_group_get   = samsung_pinconf_group_get,
 519         .pin_config_group_set   = samsung_pinconf_group_set,
 520 };
 521
 522 /* gpiolib gpio_set callback function */
 523 static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 524 {
 525         struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
 526         const struct samsung_pin_bank_type *type = bank->type;
 527         unsigned long flags;
 528         void __iomem *reg;
 529         u32 data;
 530
 531         reg = bank->drvdata->virt_base + bank->pctl_offset;
 532
 533         spin_lock_irqsave(&bank->slock, flags);
 534
 535         data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
 536         data &= ~(1 << offset);
 537         if (value)
 538                 data |= 1 << offset;
 539         writel(data, reg + type->reg_offset[PINCFG_TYPE_DAT]);
 540
 541         spin_unlock_irqrestore(&bank->slock, flags);
 542 }
 543
 544 /* gpiolib gpio_get callback function */
 545 static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
 546 {
 547         void __iomem *reg;
 548         u32 data;
 549         struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
 550         const struct samsung_pin_bank_type *type = bank->type;
 551
 552         reg = bank->drvdata->virt_base + bank->pctl_offset;
 553
 554         data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
 555         data >>= offset;
 556         data &= 1;
 557         return data;
 558 }
 559
 560 /*
 561  * The calls to gpio_direction_output() and gpio_direction_input()
 562  * leads to this function call.
 563  */
 564 static int samsung_gpio_set_direction(struct gpio_chip *gc,
 565                                              unsigned offset, bool input)
 566 {
 567         const struct samsung_pin_bank_type *type;
 568         struct samsung_pin_bank *bank;
 569         struct samsung_pinctrl_drv_data *drvdata;
 570         void __iomem *reg;
 571         u32 data, mask, shift;
 572         unsigned long flags;
 573
 574         bank = gc_to_pin_bank(gc);
 575         type = bank->type;
 576         drvdata = bank->drvdata;
 577
 578         reg = drvdata->virt_base + bank->pctl_offset +
 579                                         type->reg_offset[PINCFG_TYPE_FUNC];
 580
 581         mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
 582         shift = offset * type->fld_width[PINCFG_TYPE_FUNC];
 583         if (shift >= 32) {
 584                 /* Some banks have two config registers */
 585                 shift -= 32;
 586                 reg += 4;
 587         }
 588
 589         spin_lock_irqsave(&bank->slock, flags);
 590
 591         data = readl(reg);
 592         data &= ~(mask << shift);
 593         if (!input)
 594                 data |= FUNC_OUTPUT << shift;
 595         writel(data, reg);
 596
 597         spin_unlock_irqrestore(&bank->slock, flags);
 598
 599         return 0;
 600 }
 601
 602 /* gpiolib gpio_direction_input callback function. */
 603 static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 604 {
 605         return samsung_gpio_set_direction(gc, offset, true);
 606 }
 607
 608 /* gpiolib gpio_direction_output callback function. */
 609 static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
 610                                                         int value)
 611 {
 612         samsung_gpio_set(gc, offset, value);
 613         return samsung_gpio_set_direction(gc, offset, false);
 614 }
 615
 616 /*
 617  * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
 618  * and a virtual IRQ, if not already present.
 619  */
 620 static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 621 {
 622         struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
 623         unsigned int virq;
 624
 625         if (!bank->irq_domain)
 626                 return -ENXIO;
 627
 628         virq = irq_create_mapping(bank->irq_domain, offset);
 629
 630         return (virq) ? : -ENXIO;
 631 }
 632
 633 static struct samsung_pin_group *samsung_pinctrl_create_groups(
 634                                 struct device *dev,
 635                                 struct samsung_pinctrl_drv_data *drvdata,
 636                                 unsigned int *cnt)
 637 {
 638         struct pinctrl_desc *ctrldesc = &drvdata->pctl;
 639         struct samsung_pin_group *groups, *grp;
 640         const struct pinctrl_pin_desc *pdesc;
 641         int i;
 642
 643         groups = devm_kzalloc(dev, ctrldesc->npins * sizeof(*groups),
 644                                 GFP_KERNEL);
 645         if (!groups)
 646                 return ERR_PTR(-EINVAL);
 647         grp = groups;
 648
 649         pdesc = ctrldesc->pins;
 650         for (i = 0; i < ctrldesc->npins; ++i, ++pdesc, ++grp) {
 651                 grp->name = pdesc->name;
 652                 grp->pins = &pdesc->number;
 653                 grp->num_pins = 1;
 654         }
 655
 656         *cnt = ctrldesc->npins;
 657         return groups;
 658 }
 659
 660 static int samsung_pinctrl_create_function(struct device *dev,
 661                                 struct samsung_pinctrl_drv_data *drvdata,
 662                                 struct device_node *func_np,
 663                                 struct samsung_pmx_func *func)
 664 {
 665         int npins;
 666         int ret;
 667         int i;
 668
 669         if (of_property_read_u32(func_np, "samsung,pin-function", &func->val))
 670                 return 0;
 671
 672         npins = of_property_count_strings(func_np, "samsung,pins");
 673         if (npins < 1) {
 674                 dev_err(dev, "invalid pin list in %s node", func_np->name);
 675                 return -EINVAL;
 676         }
 677
 678         func->name = func_np->full_name;
 679
 680         func->groups = devm_kzalloc(dev, npins * sizeof(char *), GFP_KERNEL);
 681         if (!func->groups)
 682                 return -ENOMEM;
 683
 684         for (i = 0; i < npins; ++i) {
 685                 const char *gname;
 686
 687                 ret = of_property_read_string_index(func_np, "samsung,pins",
 688                                                         i, &gname);
 689                 if (ret) {
 690                         dev_err(dev,
 691                                 "failed to read pin name %d from %s node\n",
 692                                 i, func_np->name);
 693                         return ret;
 694                 }
 695
 696                 func->groups[i] = gname;
 697         }
 698
 699         func->num_groups = npins;
 700         return 1;
 701 }
 702
 703 static struct samsung_pmx_func *samsung_pinctrl_create_functions(
 704                                 struct device *dev,
 705                                 struct samsung_pinctrl_drv_data *drvdata,
 706                                 unsigned int *cnt)
 707 {
 708         struct samsung_pmx_func *functions, *func;
 709         struct device_node *dev_np = dev->of_node;
 710         struct device_node *cfg_np;
 711         unsigned int func_cnt = 0;
 712         int ret;
 713
 714         /*
 715          * Iterate over all the child nodes of the pin controller node
 716          * and create pin groups and pin function lists.
 717          */
 718         for_each_child_of_node(dev_np, cfg_np) {
 719                 struct device_node *func_np;
 720
 721                 if (!of_get_child_count(cfg_np)) {
 722                         if (!of_find_property(cfg_np,
 723                             "samsung,pin-function", NULL))
 724                                 continue;
 725                         ++func_cnt;
 726                         continue;
 727                 }
 728
 729                 for_each_child_of_node(cfg_np, func_np) {
 730                         if (!of_find_property(func_np,
 731                             "samsung,pin-function", NULL))
 732                                 continue;
 733                         ++func_cnt;
 734                 }
 735         }
 736
 737         functions = devm_kzalloc(dev, func_cnt * sizeof(*functions),
 738                                         GFP_KERNEL);
 739         if (!functions) {
 740                 dev_err(dev, "failed to allocate memory for function list\n");
 741                 return ERR_PTR(-EINVAL);
 742         }
 743         func = functions;
 744
 745         /*
 746          * Iterate over all the child nodes of the pin controller node
 747          * and create pin groups and pin function lists.
 748          */
 749         func_cnt = 0;
 750         for_each_child_of_node(dev_np, cfg_np) {
 751                 struct device_node *func_np;
 752
 753                 if (!of_get_child_count(cfg_np)) {
 754                         ret = samsung_pinctrl_create_function(dev, drvdata,
 755                                                         cfg_np, func);
 756                         if (ret < 0)
 757                                 return ERR_PTR(ret);
 758                         if (ret > 0) {
 759                                 ++func;
 760                                 ++func_cnt;
 761                         }
 762                         continue;
 763                 }
 764
 765                 for_each_child_of_node(cfg_np, func_np) {
 766                         ret = samsung_pinctrl_create_function(dev, drvdata,
 767                                                 func_np, func);
 768                         if (ret < 0)
 769                                 return ERR_PTR(ret);
 770                         if (ret > 0) {
 771                                 ++func;
 772                                 ++func_cnt;
 773                         }
 774                 }
 775         }
 776
 777         *cnt = func_cnt;
 778         return functions;
 779 }
 780
 781 /*
 782  * Parse the information about all the available pin groups and pin functions
 783  * from device node of the pin-controller. A pin group is formed with all
 784  * the pins listed in the "samsung,pins" property.
 785  */
 786
 787 static int samsung_pinctrl_parse_dt(struct platform_device *pdev,
 788                                     struct samsung_pinctrl_drv_data *drvdata)
 789 {
 790         struct device *dev = &pdev->dev;
 791         struct samsung_pin_group *groups;
 792         struct samsung_pmx_func *functions;
 793         unsigned int grp_cnt = 0, func_cnt = 0;
 794
 795         groups = samsung_pinctrl_create_groups(dev, drvdata, &grp_cnt);
 796         if (IS_ERR(groups)) {
 797                 dev_err(dev, "failed to parse pin groups\n");
 798                 return PTR_ERR(groups);
 799         }
 800
 801         functions = samsung_pinctrl_create_functions(dev, drvdata, &func_cnt);
 802         if (IS_ERR(functions)) {
 803                 dev_err(dev, "failed to parse pin functions\n");
 804                 return PTR_ERR(functions);
 805         }
 806
 807         drvdata->pin_groups = groups;
 808         drvdata->nr_groups = grp_cnt;
 809         drvdata->pmx_functions = functions;
 810         drvdata->nr_functions = func_cnt;
 811
 812         return 0;
 813 }
 814
 815 /* register the pinctrl interface with the pinctrl subsystem */
 816 static int samsung_pinctrl_register(struct platform_device *pdev,
 817                                     struct samsung_pinctrl_drv_data *drvdata)
 818 {
 819         struct pinctrl_desc *ctrldesc = &drvdata->pctl;
 820         struct pinctrl_pin_desc *pindesc, *pdesc;
 821         struct samsung_pin_bank *pin_bank;
 822         char *pin_names;
 823         int pin, bank, ret;
 824
 825         ctrldesc->name = "samsung-pinctrl";
 826         ctrldesc->owner = THIS_MODULE;
 827         ctrldesc->pctlops = &samsung_pctrl_ops;
 828         ctrldesc->pmxops = &samsung_pinmux_ops;
 829         ctrldesc->confops = &samsung_pinconf_ops;
 830
 831         pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
 832                         drvdata->nr_pins, GFP_KERNEL);
 833         if (!pindesc) {
 834                 dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
 835                 return -ENOMEM;
 836         }
 837         ctrldesc->pins = pindesc;
 838         ctrldesc->npins = drvdata->nr_pins;
 839
 840         /* dynamically populate the pin number and pin name for pindesc */
 841         for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
 842                 pdesc->number = pin + drvdata->pin_base;
 843
 844         /*
 845          * allocate space for storing the dynamically generated names for all
 846          * the pins which belong to this pin-controller.
 847          */
 848         pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
 849                                         drvdata->nr_pins, GFP_KERNEL);
 850         if (!pin_names) {
 851                 dev_err(&pdev->dev, "mem alloc for pin names failed\n");
 852                 return -ENOMEM;
 853         }
 854
 855         /* for each pin, the name of the pin is pin-bank name + pin number */
 856         for (bank = 0; bank < drvdata->nr_banks; bank++) {
 857                 pin_bank = &drvdata->pin_banks[bank];
 858                 for (pin = 0; pin < pin_bank->nr_pins; pin++) {
 859                         sprintf(pin_names, "%s-%d", pin_bank->name, pin);
 860                         pdesc = pindesc + pin_bank->pin_base + pin;
 861                         pdesc->name = pin_names;
 862                         pin_names += PIN_NAME_LENGTH;
 863                 }
 864         }
 865
 866         ret = samsung_pinctrl_parse_dt(pdev, drvdata);
 867         if (ret)
 868                 return ret;
 869
 870         drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata);
 871         if (IS_ERR(drvdata->pctl_dev)) {
 872                 dev_err(&pdev->dev, "could not register pinctrl driver\n");
 873                 return PTR_ERR(drvdata->pctl_dev);
 874         }
 875
 876         for (bank = 0; bank < drvdata->nr_banks; ++bank) {
 877                 pin_bank = &drvdata->pin_banks[bank];
 878                 pin_bank->grange.name = pin_bank->name;
 879                 pin_bank->grange.id = bank;
 880                 pin_bank->grange.pin_base = drvdata->pin_base
 881                                                 + pin_bank->pin_base;
 882                 pin_bank->grange.base = pin_bank->gpio_chip.base;
 883                 pin_bank->grange.npins = pin_bank->gpio_chip.ngpio;
 884                 pin_bank->grange.gc = &pin_bank->gpio_chip;
 885                 pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
 886         }
 887
 888         return 0;
 889 }
 890
 891 static const struct gpio_chip samsung_gpiolib_chip = {
 892         .request = gpiochip_generic_request,
 893         .free = gpiochip_generic_free,
 894         .set = samsung_gpio_set,
 895         .get = samsung_gpio_get,
 896         .direction_input = samsung_gpio_direction_input,
 897         .direction_output = samsung_gpio_direction_output,
 898         .to_irq = samsung_gpio_to_irq,
 899         .owner = THIS_MODULE,
 900 };
 901
 902 /* register the gpiolib interface with the gpiolib subsystem */
 903 static int samsung_gpiolib_register(struct platform_device *pdev,
 904                                     struct samsung_pinctrl_drv_data *drvdata)
 905 {
 906         struct samsung_pin_bank *bank = drvdata->pin_banks;
 907         struct gpio_chip *gc;
 908         int ret;
 909         int i;
 910
 911         for (i = 0; i < drvdata->nr_banks; ++i, ++bank) {
 912                 bank->gpio_chip = samsung_gpiolib_chip;
 913
 914                 gc = &bank->gpio_chip;
 915                 gc->base = drvdata->pin_base + bank->pin_base;
 916                 gc->ngpio = bank->nr_pins;
 917                 gc->dev = &pdev->dev;
 918                 gc->of_node = bank->of_node;
 919                 gc->label = bank->name;
 920
 921                 ret = gpiochip_add(gc);
 922                 if (ret) {
 923                         dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
 924                                                         gc->label, ret);
 925                         goto fail;
 926                 }
 927         }
 928
 929         return 0;
 930
 931 fail:
 932         for (--i, --bank; i >= 0; --i, --bank)
 933                 gpiochip_remove(&bank->gpio_chip);
 934         return ret;
 935 }
 936
 937 /* unregister the gpiolib interface with the gpiolib subsystem */
 938 static int samsung_gpiolib_unregister(struct platform_device *pdev,
 939                                       struct samsung_pinctrl_drv_data *drvdata)
 940 {
 941         struct samsung_pin_bank *bank = drvdata->pin_banks;
 942         int i;
 943
 944         for (i = 0; i < drvdata->nr_banks; ++i, ++bank)
 945                 gpiochip_remove(&bank->gpio_chip);
 946
 947         return 0;
 948 }
 949
 950 static const struct of_device_id samsung_pinctrl_dt_match[];
 951
 952 /* retrieve the soc specific data */
 953 static const struct samsung_pin_ctrl *
 954 samsung_pinctrl_get_soc_data(struct samsung_pinctrl_drv_data *d,
 955                              struct platform_device *pdev)
 956 {
 957         int id;
 958         const struct of_device_id *match;
 959         struct device_node *node = pdev->dev.of_node;
 960         struct device_node *np;
 961         const struct samsung_pin_bank_data *bdata;
 962         const struct samsung_pin_ctrl *ctrl;
 963         struct samsung_pin_bank *bank;
 964         int i;
 965
 966         id = of_alias_get_id(node, "pinctrl");
 967         if (id < 0) {
 968                 dev_err(&pdev->dev, "failed to get alias id\n");
 969                 return ERR_PTR(-ENOENT);
 970         }
 971         match = of_match_node(samsung_pinctrl_dt_match, node);
 972         ctrl = (struct samsung_pin_ctrl *)match->data + id;
 973
 974         d->suspend = ctrl->suspend;
 975         d->resume = ctrl->resume;
 976         d->nr_banks = ctrl->nr_banks;
 977         d->pin_banks = devm_kcalloc(&pdev->dev, d->nr_banks,
 978                                         sizeof(*d->pin_banks), GFP_KERNEL);
 979         if (!d->pin_banks)
 980                 return ERR_PTR(-ENOMEM);
 981
 982         bank = d->pin_banks;
 983         bdata = ctrl->pin_banks;
 984         for (i = 0; i < ctrl->nr_banks; ++i, ++bdata, ++bank) {
 985                 bank->type = bdata->type;
 986                 bank->pctl_offset = bdata->pctl_offset;
 987                 bank->nr_pins = bdata->nr_pins;
 988                 bank->eint_func = bdata->eint_func;
 989                 bank->eint_type = bdata->eint_type;
 990                 bank->eint_mask = bdata->eint_mask;
 991                 bank->eint_offset = bdata->eint_offset;
 992                 bank->name = bdata->name;
 993
 994                 spin_lock_init(&bank->slock);
 995                 bank->drvdata = d;
 996                 bank->pin_base = d->nr_pins;
 997                 d->nr_pins += bank->nr_pins;
 998         }
 999
1000         for_each_child_of_node(node, np) {
1001                 if (!of_find_property(np, "gpio-controller", NULL))
1002                         continue;
1003                 bank = d->pin_banks;
1004                 for (i = 0; i < d->nr_banks; ++i, ++bank) {
1005                         if (!strcmp(bank->name, np->name)) {
1006                                 bank->of_node = np;
1007                                 break;
1008                         }
1009                 }
1010         }
1011
1012         d->pin_base = pin_base;
1013         pin_base += d->nr_pins;
1014
1015         return ctrl;
1016 }
1017
1018 static int samsung_pinctrl_probe(struct platform_device *pdev)
1019 {
1020         struct samsung_pinctrl_drv_data *drvdata;
1021         const struct samsung_pin_ctrl *ctrl;
1022         struct device *dev = &pdev->dev;
1023         struct resource *res;
1024         int ret;
1025
1026         if (!dev->of_node) {
1027                 dev_err(dev, "device tree node not found\n");
1028                 return -ENODEV;
1029         }
1030
1031         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
1032         if (!drvdata) {
1033                 dev_err(dev, "failed to allocate memory for driver's "
1034                                 "private data\n");
1035                 return -ENOMEM;
1036         }
1037
1038         ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev);
1039         if (IS_ERR(ctrl)) {
1040                 dev_err(&pdev->dev, "driver data not available\n");
1041                 return PTR_ERR(ctrl);
1042         }
1043         drvdata->dev = dev;
1044
1045         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1046         drvdata->virt_base = devm_ioremap_resource(&pdev->dev, res);
1047         if (IS_ERR(drvdata->virt_base))
1048                 return PTR_ERR(drvdata->virt_base);
1049
1050         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1051         if (res)
1052                 drvdata->irq = res->start;
1053
1054         ret = samsung_gpiolib_register(pdev, drvdata);
1055         if (ret)
1056                 return ret;
1057
1058         ret = samsung_pinctrl_register(pdev, drvdata);
1059         if (ret) {
1060                 samsung_gpiolib_unregister(pdev, drvdata);
1061                 return ret;
1062         }
1063
1064         if (ctrl->eint_gpio_init)
1065                 ctrl->eint_gpio_init(drvdata);
1066         if (ctrl->eint_wkup_init)
1067                 ctrl->eint_wkup_init(drvdata);
1068
1069         platform_set_drvdata(pdev, drvdata);
1070
1071         /* Add to the global list */
1072         list_add_tail(&drvdata->node, &drvdata_list);
1073
1074         return 0;
1075 }
1076
1077 #ifdef CONFIG_PM
1078
1079 /**
1080  * samsung_pinctrl_suspend_dev - save pinctrl state for suspend for a device
1081  *
1082  * Save data for all banks handled by this device.
1083  */
1084 static void samsung_pinctrl_suspend_dev(
1085         struct samsung_pinctrl_drv_data *drvdata)
1086 {
1087         void __iomem *virt_base = drvdata->virt_base;
1088         int i;
1089
1090         for (i = 0; i < drvdata->nr_banks; i++) {
1091                 struct samsung_pin_bank *bank = &drvdata->pin_banks[i];
1092                 void __iomem *reg = virt_base + bank->pctl_offset;
1093                 const u8 *offs = bank->type->reg_offset;
1094                 const u8 *widths = bank->type->fld_width;
1095                 enum pincfg_type type;
1096
1097                 /* Registers without a powerdown config aren't lost */
1098                 if (!widths[PINCFG_TYPE_CON_PDN])
1099                         continue;
1100
1101                 for (type = 0; type < PINCFG_TYPE_NUM; type++)
1102                         if (widths[type])
1103                                 bank->pm_save[type] = readl(reg + offs[type]);
1104
1105                 if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) {
1106                         /* Some banks have two config registers */
1107                         bank->pm_save[PINCFG_TYPE_NUM] =
1108                                 readl(reg + offs[PINCFG_TYPE_FUNC] + 4);
1109                         pr_debug("Save %s @ %p (con %#010x %08x)\n",
1110                                  bank->name, reg,
1111                                  bank->pm_save[PINCFG_TYPE_FUNC],
1112                                  bank->pm_save[PINCFG_TYPE_NUM]);
1113                 } else {
1114                         pr_debug("Save %s @ %p (con %#010x)\n", bank->name,
1115                                  reg, bank->pm_save[PINCFG_TYPE_FUNC]);
1116                 }
1117         }
1118
1119         if (drvdata->suspend)
1120                 drvdata->suspend(drvdata);
1121 }
1122
1123 /**
1124  * samsung_pinctrl_resume_dev - restore pinctrl state from suspend for a device
1125  *
1126  * Restore one of the banks that was saved during suspend.
1127  *
1128  * We don't bother doing anything complicated to avoid glitching lines since
1129  * we're called before pad retention is turned off.
1130  */
1131 static void samsung_pinctrl_resume_dev(struct samsung_pinctrl_drv_data *drvdata)
1132 {
1133         void __iomem *virt_base = drvdata->virt_base;
1134         int i;
1135
1136         if (drvdata->resume)
1137                 drvdata->resume(drvdata);
1138
1139         for (i = 0; i < drvdata->nr_banks; i++) {
1140                 struct samsung_pin_bank *bank = &drvdata->pin_banks[i];
1141                 void __iomem *reg = virt_base + bank->pctl_offset;
1142                 const u8 *offs = bank->type->reg_offset;
1143                 const u8 *widths = bank->type->fld_width;
1144                 enum pincfg_type type;
1145
1146                 /* Registers without a powerdown config aren't lost */
1147                 if (!widths[PINCFG_TYPE_CON_PDN])
1148                         continue;
1149
1150                 if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) {
1151                         /* Some banks have two config registers */
1152                         pr_debug("%s @ %p (con %#010x %08x => %#010x %08x)\n",
1153                                  bank->name, reg,
1154                                  readl(reg + offs[PINCFG_TYPE_FUNC]),
1155                                  readl(reg + offs[PINCFG_TYPE_FUNC] + 4),
1156                                  bank->pm_save[PINCFG_TYPE_FUNC],
1157                                  bank->pm_save[PINCFG_TYPE_NUM]);
1158                         writel(bank->pm_save[PINCFG_TYPE_NUM],
1159                                reg + offs[PINCFG_TYPE_FUNC] + 4);
1160                 } else {
1161                         pr_debug("%s @ %p (con %#010x => %#010x)\n", bank->name,
1162                                  reg, readl(reg + offs[PINCFG_TYPE_FUNC]),
1163                                  bank->pm_save[PINCFG_TYPE_FUNC]);
1164                 }
1165                 for (type = 0; type < PINCFG_TYPE_NUM; type++)
1166                         if (widths[type])
1167                                 writel(bank->pm_save[type], reg + offs[type]);
1168         }
1169 }
1170
1171 /**
1172  * samsung_pinctrl_suspend - save pinctrl state for suspend
1173  *
1174  * Save data for all banks across all devices.
1175  */
1176 static int samsung_pinctrl_suspend(void)
1177 {
1178         struct samsung_pinctrl_drv_data *drvdata;
1179
1180         list_for_each_entry(drvdata, &drvdata_list, node) {
1181                 samsung_pinctrl_suspend_dev(drvdata);
1182         }
1183
1184         return 0;
1185 }
1186
1187 /**
1188  * samsung_pinctrl_resume - restore pinctrl state for suspend
1189  *
1190  * Restore data for all banks across all devices.
1191  */
1192 static void samsung_pinctrl_resume(void)
1193 {
1194         struct samsung_pinctrl_drv_data *drvdata;
1195
1196         list_for_each_entry_reverse(drvdata, &drvdata_list, node) {
1197                 samsung_pinctrl_resume_dev(drvdata);
1198         }
1199 }
1200
1201 #else
1202 #define samsung_pinctrl_suspend         NULL
1203 #define samsung_pinctrl_resume          NULL
1204 #endif
1205
1206 static struct syscore_ops samsung_pinctrl_syscore_ops = {
1207         .suspend        = samsung_pinctrl_suspend,
1208         .resume         = samsung_pinctrl_resume,
1209 };
1210
1211 static const struct of_device_id samsung_pinctrl_dt_match[] = {
1212 #ifdef CONFIG_PINCTRL_EXYNOS
1213         { .compatible = "samsung,exynos3250-pinctrl",
1214                 .data = (void *)exynos3250_pin_ctrl },
1215         { .compatible = "samsung,exynos4210-pinctrl",
1216                 .data = (void *)exynos4210_pin_ctrl },
1217         { .compatible = "samsung,exynos4x12-pinctrl",
1218                 .data = (void *)exynos4x12_pin_ctrl },
1219         { .compatible = "samsung,exynos4415-pinctrl",
1220                 .data = (void *)exynos4415_pin_ctrl },
1221         { .compatible = "samsung,exynos5250-pinctrl",
1222                 .data = (void *)exynos5250_pin_ctrl },
1223         { .compatible = "samsung,exynos5260-pinctrl",
1224                 .data = (void *)exynos5260_pin_ctrl },
1225         { .compatible = "samsung,exynos5410-pinctrl",
1226                 .data = (void *)exynos5410_pin_ctrl },
1227         { .compatible = "samsung,exynos5420-pinctrl",
1228                 .data = (void *)exynos5420_pin_ctrl },
1229         { .compatible = "samsung,exynos5433-pinctrl",
1230                 .data = (void *)exynos5433_pin_ctrl },
1231         { .compatible = "samsung,s5pv210-pinctrl",
1232                 .data = (void *)s5pv210_pin_ctrl },
1233         { .compatible = "samsung,exynos7-pinctrl",
1234                 .data = (void *)exynos7_pin_ctrl },
1235 #endif
1236 #ifdef CONFIG_PINCTRL_S3C64XX
1237         { .compatible = "samsung,s3c64xx-pinctrl",
1238                 .data = s3c64xx_pin_ctrl },
1239 #endif
1240 #ifdef CONFIG_PINCTRL_S3C24XX
1241         { .compatible = "samsung,s3c2412-pinctrl",
1242                 .data = s3c2412_pin_ctrl },
1243         { .compatible = "samsung,s3c2416-pinctrl",
1244                 .data = s3c2416_pin_ctrl },
1245         { .compatible = "samsung,s3c2440-pinctrl",
1246                 .data = s3c2440_pin_ctrl },
1247         { .compatible = "samsung,s3c2450-pinctrl",
1248                 .data = s3c2450_pin_ctrl },
1249 #endif
1250         {},
1251 };
1252 MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);
1253
1254 static struct platform_driver samsung_pinctrl_driver = {
1255         .probe          = samsung_pinctrl_probe,
1256         .driver = {
1257                 .name   = "samsung-pinctrl",
1258                 .of_match_table = samsung_pinctrl_dt_match,
1259         },
1260 };
1261
1262 static int __init samsung_pinctrl_drv_register(void)
1263 {
1264         /*
1265          * Register syscore ops for save/restore of registers across suspend.
1266          * It's important to ensure that this driver is running at an earlier
1267          * initcall level than any arch-specific init calls that install syscore
1268          * ops that turn off pad retention (like exynos_pm_resume).
1269          */
1270         register_syscore_ops(&samsung_pinctrl_syscore_ops);
1271
1272         return platform_driver_register(&samsung_pinctrl_driver);
1273 }
1274 postcore_initcall(samsung_pinctrl_drv_register);
1275
1276 static void __exit samsung_pinctrl_drv_unregister(void)
1277 {
1278         platform_driver_unregister(&samsung_pinctrl_driver);
1279 }
1280 module_exit(samsung_pinctrl_drv_unregister);
1281
1282 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
1283 MODULE_DESCRIPTION("Samsung pinctrl driver");
1284 MODULE_LICENSE("GPL v2");