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