drivers/pinctrl/pinmux.c

   1 /*
   2  * Core driver for the pin muxing portions of the pin control subsystem
   3  *
   4  * Copyright (C) 2011-2012 ST-Ericsson SA
   5  * Written on behalf of Linaro for ST-Ericsson
   6  * Based on bits of regulator core, gpio core and clk core
   7  *
   8  * Author: Linus Walleij <linus.walleij@linaro.org>
   9  *
  10  * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
  11  *
  12  * License terms: GNU General Public License (GPL) version 2
  13  */
  14 #define pr_fmt(fmt) "pinmux core: " fmt
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/device.h>
  20 #include <linux/slab.h>
  21 #include <linux/radix-tree.h>
  22 #include <linux/err.h>
  23 #include <linux/list.h>
  24 #include <linux/string.h>
  25 #include <linux/sysfs.h>
  26 #include <linux/debugfs.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/pinctrl/machine.h>
  29 #include <linux/pinctrl/pinmux.h>
  30 #include "core.h"
  31 #include "pinmux.h"
  32
  33 int pinmux_check_ops(struct pinctrl_dev *pctldev)
  34 {
  35         const struct pinmux_ops *ops = pctldev->desc->pmxops;
  36         unsigned nfuncs;
  37         unsigned selector = 0;
  38
  39         /* Check that we implement required operations */
  40         if (!ops ||
  41             !ops->get_functions_count ||
  42             !ops->get_function_name ||
  43             !ops->get_function_groups ||
  44             !ops->set_mux) {
  45                 dev_err(pctldev->dev, "pinmux ops lacks necessary functions\n");
  46                 return -EINVAL;
  47         }
  48         /* Check that all functions registered have names */
  49         nfuncs = ops->get_functions_count(pctldev);
  50         while (selector < nfuncs) {
  51                 const char *fname = ops->get_function_name(pctldev,
  52                                                            selector);
  53                 if (!fname) {
  54                         dev_err(pctldev->dev, "pinmux ops has no name for function%u\n",
  55                                 selector);
  56                         return -EINVAL;
  57                 }
  58                 selector++;
  59         }
  60
  61         return 0;
  62 }
  63
  64 int pinmux_validate_map(struct pinctrl_map const *map, int i)
  65 {
  66         if (!map->data.mux.function) {
  67                 pr_err("failed to register map %s (%d): no function given\n",
  68                        map->name, i);
  69                 return -EINVAL;
  70         }
  71
  72         return 0;
  73 }
  74
  75 /**
  76  * pin_request() - request a single pin to be muxed in, typically for GPIO
  77  * @pin: the pin number in the global pin space
  78  * @owner: a representation of the owner of this pin; typically the device
  79  *      name that controls its mux function, or the requested GPIO name
  80  * @gpio_range: the range matching the GPIO pin if this is a request for a
  81  *      single GPIO pin
  82  */
  83 static int pin_request(struct pinctrl_dev *pctldev,
  84                        int pin, const char *owner,
  85                        struct pinctrl_gpio_range *gpio_range)
  86 {
  87         struct pin_desc *desc;
  88         const struct pinmux_ops *ops = pctldev->desc->pmxops;
  89         int status = -EINVAL;
  90
  91         desc = pin_desc_get(pctldev, pin);
  92         if (desc == NULL) {
  93                 dev_err(pctldev->dev,
  94                         "pin %d is not registered so it cannot be requested\n",
  95                         pin);
  96                 goto out;
  97         }
  98
  99         dev_dbg(pctldev->dev, "request pin %d (%s) for %s\n",
 100                 pin, desc->name, owner);
 101
 102         if (gpio_range) {
 103                 /* There's no need to support multiple GPIO requests */
 104                 if (desc->gpio_owner) {
 105                         dev_err(pctldev->dev,
 106                                 "pin %s already requested by %s; cannot claim for %s\n",
 107                                 desc->name, desc->gpio_owner, owner);
 108                         goto out;
 109                 }
 110                 if (ops->strict && desc->mux_usecount &&
 111                     strcmp(desc->mux_owner, owner)) {
 112                         dev_err(pctldev->dev,
 113                                 "pin %s already requested by %s; cannot claim for %s\n",
 114                                 desc->name, desc->mux_owner, owner);
 115                         goto out;
 116                 }
 117
 118                 desc->gpio_owner = owner;
 119         } else {
 120                 if (desc->mux_usecount && strcmp(desc->mux_owner, owner)) {
 121                         dev_err(pctldev->dev,
 122                                 "pin %s already requested by %s; cannot claim for %s\n",
 123                                 desc->name, desc->mux_owner, owner);
 124                         goto out;
 125                 }
 126                 if (ops->strict && desc->gpio_owner) {
 127                         dev_err(pctldev->dev,
 128                                 "pin %s already requested by %s; cannot claim for %s\n",
 129                                 desc->name, desc->gpio_owner, owner);
 130                         goto out;
 131                 }
 132
 133                 desc->mux_usecount++;
 134                 if (desc->mux_usecount > 1)
 135                         return 0;
 136
 137                 desc->mux_owner = owner;
 138         }
 139
 140         /* Let each pin increase references to this module */
 141         if (!try_module_get(pctldev->owner)) {
 142                 dev_err(pctldev->dev,
 143                         "could not increase module refcount for pin %d\n",
 144                         pin);
 145                 status = -EINVAL;
 146                 goto out_free_pin;
 147         }
 148
 149         /*
 150          * If there is no kind of request function for the pin we just assume
 151          * we got it by default and proceed.
 152          */
 153         if (gpio_range && ops->gpio_request_enable)
 154                 /* This requests and enables a single GPIO pin */
 155                 status = ops->gpio_request_enable(pctldev, gpio_range, pin);
 156         else if (ops->request)
 157                 status = ops->request(pctldev, pin);
 158         else
 159                 status = 0;
 160
 161         if (status) {
 162                 dev_err(pctldev->dev, "request() failed for pin %d\n", pin);
 163                 module_put(pctldev->owner);
 164         }
 165
 166 out_free_pin:
 167         if (status) {
 168                 if (gpio_range) {
 169                         desc->gpio_owner = NULL;
 170                 } else {
 171                         desc->mux_usecount--;
 172                         if (!desc->mux_usecount)
 173                                 desc->mux_owner = NULL;
 174                 }
 175         }
 176 out:
 177         if (status)
 178                 dev_err(pctldev->dev, "pin-%d (%s) status %d\n",
 179                         pin, owner, status);
 180
 181         return status;
 182 }
 183
 184 /**
 185  * pin_free() - release a single muxed in pin so something else can be muxed
 186  * @pctldev: pin controller device handling this pin
 187  * @pin: the pin to free
 188  * @gpio_range: the range matching the GPIO pin if this is a request for a
 189  *      single GPIO pin
 190  *
 191  * This function returns a pointer to the previous owner. This is used
 192  * for callers that dynamically allocate an owner name so it can be freed
 193  * once the pin is free. This is done for GPIO request functions.
 194  */
 195 static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
 196                             struct pinctrl_gpio_range *gpio_range)
 197 {
 198         const struct pinmux_ops *ops = pctldev->desc->pmxops;
 199         struct pin_desc *desc;
 200         const char *owner;
 201
 202         desc = pin_desc_get(pctldev, pin);
 203         if (desc == NULL) {
 204                 dev_err(pctldev->dev,
 205                         "pin is not registered so it cannot be freed\n");
 206                 return NULL;
 207         }
 208
 209         if (!gpio_range) {
 210                 /*
 211                  * A pin should not be freed more times than allocated.
 212                  */
 213                 if (WARN_ON(!desc->mux_usecount))
 214                         return NULL;
 215                 desc->mux_usecount--;
 216                 if (desc->mux_usecount)
 217                         return NULL;
 218         }
 219
 220         /*
 221          * If there is no kind of request function for the pin we just assume
 222          * we got it by default and proceed.
 223          */
 224         if (gpio_range && ops->gpio_disable_free)
 225                 ops->gpio_disable_free(pctldev, gpio_range, pin);
 226         else if (ops->free)
 227                 ops->free(pctldev, pin);
 228
 229         if (gpio_range) {
 230                 owner = desc->gpio_owner;
 231                 desc->gpio_owner = NULL;
 232         } else {
 233                 owner = desc->mux_owner;
 234                 desc->mux_owner = NULL;
 235                 desc->mux_setting = NULL;
 236         }
 237
 238         module_put(pctldev->owner);
 239
 240         return owner;
 241 }
 242
 243 /**
 244  * pinmux_request_gpio() - request pinmuxing for a GPIO pin
 245  * @pctldev: pin controller device affected
 246  * @pin: the pin to mux in for GPIO
 247  * @range: the applicable GPIO range
 248  */
 249 int pinmux_request_gpio(struct pinctrl_dev *pctldev,
 250                         struct pinctrl_gpio_range *range,
 251                         unsigned pin, unsigned gpio)
 252 {
 253         const char *owner;
 254         int ret;
 255
 256         /* Conjure some name stating what chip and pin this is taken by */
 257         owner = kasprintf(GFP_KERNEL, "%s:%d", range->name, gpio);
 258         if (!owner)
 259                 return -ENOMEM;
 260
 261         ret = pin_request(pctldev, pin, owner, range);
 262         if (ret < 0)
 263                 kfree(owner);
 264
 265         return ret;
 266 }
 267
 268 /**
 269  * pinmux_free_gpio() - release a pin from GPIO muxing
 270  * @pctldev: the pin controller device for the pin
 271  * @pin: the affected currently GPIO-muxed in pin
 272  * @range: applicable GPIO range
 273  */
 274 void pinmux_free_gpio(struct pinctrl_dev *pctldev, unsigned pin,
 275                       struct pinctrl_gpio_range *range)
 276 {
 277         const char *owner;
 278
 279         owner = pin_free(pctldev, pin, range);
 280         kfree(owner);
 281 }
 282
 283 /**
 284  * pinmux_gpio_direction() - set the direction of a single muxed-in GPIO pin
 285  * @pctldev: the pin controller handling this pin
 286  * @range: applicable GPIO range
 287  * @pin: the affected GPIO pin in this controller
 288  * @input: true if we set the pin as input, false for output
 289  */
 290 int pinmux_gpio_direction(struct pinctrl_dev *pctldev,
 291                           struct pinctrl_gpio_range *range,
 292                           unsigned pin, bool input)
 293 {
 294         const struct pinmux_ops *ops;
 295         int ret;
 296
 297         ops = pctldev->desc->pmxops;
 298
 299         if (ops->gpio_set_direction)
 300                 ret = ops->gpio_set_direction(pctldev, range, pin, input);
 301         else
 302                 ret = 0;
 303
 304         return ret;
 305 }
 306
 307 static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev,
 308                                         const char *function)
 309 {
 310         const struct pinmux_ops *ops = pctldev->desc->pmxops;
 311         unsigned nfuncs = ops->get_functions_count(pctldev);
 312         unsigned selector = 0;
 313
 314         /* See if this pctldev has this function */
 315         while (selector < nfuncs) {
 316                 const char *fname = ops->get_function_name(pctldev, selector);
 317
 318                 if (!strcmp(function, fname))
 319                         return selector;
 320
 321                 selector++;
 322         }
 323
 324         dev_err(pctldev->dev, "function '%s' not supported\n", function);
 325         return -EINVAL;
 326 }
 327
 328 int pinmux_map_to_setting(struct pinctrl_map const *map,
 329                           struct pinctrl_setting *setting)
 330 {
 331         struct pinctrl_dev *pctldev = setting->pctldev;
 332         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 333         char const * const *groups;
 334         unsigned num_groups;
 335         int ret;
 336         const char *group;
 337
 338         if (!pmxops) {
 339                 dev_err(pctldev->dev, "does not support mux function\n");
 340                 return -EINVAL;
 341         }
 342
 343         ret = pinmux_func_name_to_selector(pctldev, map->data.mux.function);
 344         if (ret < 0) {
 345                 dev_err(pctldev->dev, "invalid function %s in map table\n",
 346                         map->data.mux.function);
 347                 return ret;
 348         }
 349         setting->data.mux.func = ret;
 350
 351         ret = pmxops->get_function_groups(pctldev, setting->data.mux.func,
 352                                           &groups, &num_groups);
 353         if (ret < 0) {
 354                 dev_err(pctldev->dev, "can't query groups for function %s\n",
 355                         map->data.mux.function);
 356                 return ret;
 357         }
 358         if (!num_groups) {
 359                 dev_err(pctldev->dev,
 360                         "function %s can't be selected on any group\n",
 361                         map->data.mux.function);
 362                 return -EINVAL;
 363         }
 364         if (map->data.mux.group) {
 365                 group = map->data.mux.group;
 366                 ret = match_string(groups, num_groups, group);
 367                 if (ret < 0) {
 368                         dev_err(pctldev->dev,
 369                                 "invalid group \"%s\" for function \"%s\"\n",
 370                                 group, map->data.mux.function);
 371                         return ret;
 372                 }
 373         } else {
 374                 group = groups[0];
 375         }
 376
 377         ret = pinctrl_get_group_selector(pctldev, group);
 378         if (ret < 0) {
 379                 dev_err(pctldev->dev, "invalid group %s in map table\n",
 380                         map->data.mux.group);
 381                 return ret;
 382         }
 383         setting->data.mux.group = ret;
 384
 385         return 0;
 386 }
 387
 388 void pinmux_free_setting(struct pinctrl_setting const *setting)
 389 {
 390         /* This function is currently unused */
 391 }
 392
 393 int pinmux_enable_setting(struct pinctrl_setting const *setting)
 394 {
 395         struct pinctrl_dev *pctldev = setting->pctldev;
 396         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 397         const struct pinmux_ops *ops = pctldev->desc->pmxops;
 398         int ret = 0;
 399         const unsigned *pins = NULL;
 400         unsigned num_pins = 0;
 401         int i;
 402         struct pin_desc *desc;
 403
 404         if (pctlops->get_group_pins)
 405                 ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
 406                                               &pins, &num_pins);
 407
 408         if (ret) {
 409                 const char *gname;
 410
 411                 /* errors only affect debug data, so just warn */
 412                 gname = pctlops->get_group_name(pctldev,
 413                                                 setting->data.mux.group);
 414                 dev_warn(pctldev->dev,
 415                          "could not get pins for group %s\n",
 416                          gname);
 417                 num_pins = 0;
 418         }
 419
 420         /* Try to allocate all pins in this group, one by one */
 421         for (i = 0; i < num_pins; i++) {
 422                 ret = pin_request(pctldev, pins[i], setting->dev_name, NULL);
 423                 if (ret) {
 424                         const char *gname;
 425                         const char *pname;
 426
 427                         desc = pin_desc_get(pctldev, pins[i]);
 428                         pname = desc ? desc->name : "non-existing";
 429                         gname = pctlops->get_group_name(pctldev,
 430                                                 setting->data.mux.group);
 431                         dev_err(pctldev->dev,
 432                                 "could not request pin %d (%s) from group %s "
 433                                 " on device %s\n",
 434                                 pins[i], pname, gname,
 435                                 pinctrl_dev_get_name(pctldev));
 436                         goto err_pin_request;
 437                 }
 438         }
 439
 440         /* Now that we have acquired the pins, encode the mux setting */
 441         for (i = 0; i < num_pins; i++) {
 442                 desc = pin_desc_get(pctldev, pins[i]);
 443                 if (desc == NULL) {
 444                         dev_warn(pctldev->dev,
 445                                  "could not get pin desc for pin %d\n",
 446                                  pins[i]);
 447                         continue;
 448                 }
 449                 desc->mux_setting = &(setting->data.mux);
 450         }
 451
 452         ret = ops->set_mux(pctldev, setting->data.mux.func,
 453                            setting->data.mux.group);
 454
 455         if (ret)
 456                 goto err_set_mux;
 457
 458         return 0;
 459
 460 err_set_mux:
 461         for (i = 0; i < num_pins; i++) {
 462                 desc = pin_desc_get(pctldev, pins[i]);
 463                 if (desc)
 464                         desc->mux_setting = NULL;
 465         }
 466 err_pin_request:
 467         /* On error release all taken pins */
 468         while (--i >= 0)
 469                 pin_free(pctldev, pins[i], NULL);
 470
 471         return ret;
 472 }
 473
 474 void pinmux_disable_setting(struct pinctrl_setting const *setting)
 475 {
 476         struct pinctrl_dev *pctldev = setting->pctldev;
 477         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 478         int ret = 0;
 479         const unsigned *pins = NULL;
 480         unsigned num_pins = 0;
 481         int i;
 482         struct pin_desc *desc;
 483
 484         if (pctlops->get_group_pins)
 485                 ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
 486                                               &pins, &num_pins);
 487         if (ret) {
 488                 const char *gname;
 489
 490                 /* errors only affect debug data, so just warn */
 491                 gname = pctlops->get_group_name(pctldev,
 492                                                 setting->data.mux.group);
 493                 dev_warn(pctldev->dev,
 494                          "could not get pins for group %s\n",
 495                          gname);
 496                 num_pins = 0;
 497         }
 498
 499         /* Flag the descs that no setting is active */
 500         for (i = 0; i < num_pins; i++) {
 501                 desc = pin_desc_get(pctldev, pins[i]);
 502                 if (desc == NULL) {
 503                         dev_warn(pctldev->dev,
 504                                  "could not get pin desc for pin %d\n",
 505                                  pins[i]);
 506                         continue;
 507                 }
 508                 if (desc->mux_setting == &(setting->data.mux)) {
 509                         desc->mux_setting = NULL;
 510                         /* And release the pin */
 511                         pin_free(pctldev, pins[i], NULL);
 512                 } else {
 513                         const char *gname;
 514
 515                         gname = pctlops->get_group_name(pctldev,
 516                                                 setting->data.mux.group);
 517                         dev_warn(pctldev->dev,
 518                                  "not freeing pin %d (%s) as part of "
 519                                  "deactivating group %s - it is already "
 520                                  "used for some other setting",
 521                                  pins[i], desc->name, gname);
 522                 }
 523         }
 524 }
 525
 526 #ifdef CONFIG_DEBUG_FS
 527
 528 /* Called from pincontrol core */
 529 static int pinmux_functions_show(struct seq_file *s, void *what)
 530 {
 531         struct pinctrl_dev *pctldev = s->private;
 532         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 533         unsigned nfuncs;
 534         unsigned func_selector = 0;
 535
 536         if (!pmxops)
 537                 return 0;
 538
 539         mutex_lock(&pctldev->mutex);
 540         nfuncs = pmxops->get_functions_count(pctldev);
 541         while (func_selector < nfuncs) {
 542                 const char *func = pmxops->get_function_name(pctldev,
 543                                                           func_selector);
 544                 const char * const *groups;
 545                 unsigned num_groups;
 546                 int ret;
 547                 int i;
 548
 549                 ret = pmxops->get_function_groups(pctldev, func_selector,
 550                                                   &groups, &num_groups);
 551                 if (ret) {
 552                         seq_printf(s, "function %s: COULD NOT GET GROUPS\n",
 553                                    func);
 554                         func_selector++;
 555                         continue;
 556                 }
 557
 558                 seq_printf(s, "function: %s, groups = [ ", func);
 559                 for (i = 0; i < num_groups; i++)
 560                         seq_printf(s, "%s ", groups[i]);
 561                 seq_puts(s, "]\n");
 562
 563                 func_selector++;
 564         }
 565
 566         mutex_unlock(&pctldev->mutex);
 567
 568         return 0;
 569 }
 570
 571 static int pinmux_pins_show(struct seq_file *s, void *what)
 572 {
 573         struct pinctrl_dev *pctldev = s->private;
 574         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 575         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 576         unsigned i, pin;
 577
 578         if (!pmxops)
 579                 return 0;
 580
 581         seq_puts(s, "Pinmux settings per pin\n");
 582         if (pmxops->strict)
 583                 seq_puts(s,
 584                  "Format: pin (name): mux_owner|gpio_owner (strict) hog?\n");
 585         else
 586                 seq_puts(s,
 587                 "Format: pin (name): mux_owner gpio_owner hog?\n");
 588
 589         mutex_lock(&pctldev->mutex);
 590
 591         /* The pin number can be retrived from the pin controller descriptor */
 592         for (i = 0; i < pctldev->desc->npins; i++) {
 593                 struct pin_desc *desc;
 594                 bool is_hog = false;
 595
 596                 pin = pctldev->desc->pins[i].number;
 597                 desc = pin_desc_get(pctldev, pin);
 598                 /* Skip if we cannot search the pin */
 599                 if (desc == NULL)
 600                         continue;
 601
 602                 if (desc->mux_owner &&
 603                     !strcmp(desc->mux_owner, pinctrl_dev_get_name(pctldev)))
 604                         is_hog = true;
 605
 606                 if (pmxops->strict) {
 607                         if (desc->mux_owner)
 608                                 seq_printf(s, "pin %d (%s): device %s%s",
 609                                            pin, desc->name, desc->mux_owner,
 610                                            is_hog ? " (HOG)" : "");
 611                         else if (desc->gpio_owner)
 612                                 seq_printf(s, "pin %d (%s): GPIO %s",
 613                                            pin, desc->name, desc->gpio_owner);
 614                         else
 615                                 seq_printf(s, "pin %d (%s): UNCLAIMED",
 616                                            pin, desc->name);
 617                 } else {
 618                         /* For non-strict controllers */
 619                         seq_printf(s, "pin %d (%s): %s %s%s", pin, desc->name,
 620                                    desc->mux_owner ? desc->mux_owner
 621                                    : "(MUX UNCLAIMED)",
 622                                    desc->gpio_owner ? desc->gpio_owner
 623                                    : "(GPIO UNCLAIMED)",
 624                                    is_hog ? " (HOG)" : "");
 625                 }
 626
 627                 /* If mux: print function+group claiming the pin */
 628                 if (desc->mux_setting)
 629                         seq_printf(s, " function %s group %s\n",
 630                                    pmxops->get_function_name(pctldev,
 631                                         desc->mux_setting->func),
 632                                    pctlops->get_group_name(pctldev,
 633                                         desc->mux_setting->group));
 634                 else
 635                         seq_printf(s, "\n");
 636         }
 637
 638         mutex_unlock(&pctldev->mutex);
 639
 640         return 0;
 641 }
 642
 643 void pinmux_show_map(struct seq_file *s, struct pinctrl_map const *map)
 644 {
 645         seq_printf(s, "group %s\nfunction %s\n",
 646                 map->data.mux.group ? map->data.mux.group : "(default)",
 647                 map->data.mux.function);
 648 }
 649
 650 void pinmux_show_setting(struct seq_file *s,
 651                          struct pinctrl_setting const *setting)
 652 {
 653         struct pinctrl_dev *pctldev = setting->pctldev;
 654         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 655         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 656
 657         seq_printf(s, "group: %s (%u) function: %s (%u)\n",
 658                    pctlops->get_group_name(pctldev, setting->data.mux.group),
 659                    setting->data.mux.group,
 660                    pmxops->get_function_name(pctldev, setting->data.mux.func),
 661                    setting->data.mux.func);
 662 }
 663
 664 static int pinmux_functions_open(struct inode *inode, struct file *file)
 665 {
 666         return single_open(file, pinmux_functions_show, inode->i_private);
 667 }
 668
 669 static int pinmux_pins_open(struct inode *inode, struct file *file)
 670 {
 671         return single_open(file, pinmux_pins_show, inode->i_private);
 672 }
 673
 674 static const struct file_operations pinmux_functions_ops = {
 675         .open           = pinmux_functions_open,
 676         .read           = seq_read,
 677         .llseek         = seq_lseek,
 678         .release        = single_release,
 679 };
 680
 681 static const struct file_operations pinmux_pins_ops = {
 682         .open           = pinmux_pins_open,
 683         .read           = seq_read,
 684         .llseek         = seq_lseek,
 685         .release        = single_release,
 686 };
 687
 688 void pinmux_init_device_debugfs(struct dentry *devroot,
 689                          struct pinctrl_dev *pctldev)
 690 {
 691         debugfs_create_file("pinmux-functions", S_IFREG | S_IRUGO,
 692                             devroot, pctldev, &pinmux_functions_ops);
 693         debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO,
 694                             devroot, pctldev, &pinmux_pins_ops);
 695 }
 696
 697 #endif /* CONFIG_DEBUG_FS */