drivers/pinctrl/pinctrl-imx.c

   1 /*
   2  * Core driver for the imx pin controller
   3  *
   4  * Copyright (C) 2012 Freescale Semiconductor, Inc.
   5  * Copyright (C) 2012 Linaro Ltd.
   6  *
   7  * Author: Dong Aisheng <dong.aisheng@linaro.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #include <linux/err.h>
  16 #include <linux/init.h>
  17 #include <linux/io.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/of_device.h>
  21 #include <linux/pinctrl/machine.h>
  22 #include <linux/pinctrl/pinconf.h>
  23 #include <linux/pinctrl/pinctrl.h>
  24 #include <linux/pinctrl/pinmux.h>
  25 #include <linux/slab.h>
  26
  27 #include "core.h"
  28 #include "pinctrl-imx.h"
  29
  30 /* The bits in CONFIG cell defined in binding doc*/
  31 #define IMX_NO_PAD_CTL  0x80000000      /* no pin config need */
  32 #define IMX_PAD_SION 0x40000000         /* set SION */
  33
  34 /**
  35  * @dev: a pointer back to containing device
  36  * @base: the offset to the controller in virtual memory
  37  */
  38 struct imx_pinctrl {
  39         struct device *dev;
  40         struct pinctrl_dev *pctl;
  41         void __iomem *base;
  42         const struct imx_pinctrl_soc_info *info;
  43 };
  44
  45 static const inline struct imx_pin_group *imx_pinctrl_find_group_by_name(
  46                                 const struct imx_pinctrl_soc_info *info,
  47                                 const char *name)
  48 {
  49         const struct imx_pin_group *grp = NULL;
  50         int i;
  51
  52         for (i = 0; i < info->ngroups; i++) {
  53                 if (!strcmp(info->groups[i].name, name)) {
  54                         grp = &info->groups[i];
  55                         break;
  56                 }
  57         }
  58
  59         return grp;
  60 }
  61
  62 static int imx_get_groups_count(struct pinctrl_dev *pctldev)
  63 {
  64         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
  65         const struct imx_pinctrl_soc_info *info = ipctl->info;
  66
  67         return info->ngroups;
  68 }
  69
  70 static const char *imx_get_group_name(struct pinctrl_dev *pctldev,
  71                                        unsigned selector)
  72 {
  73         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
  74         const struct imx_pinctrl_soc_info *info = ipctl->info;
  75
  76         return info->groups[selector].name;
  77 }
  78
  79 static int imx_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
  80                                const unsigned **pins,
  81                                unsigned *npins)
  82 {
  83         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
  84         const struct imx_pinctrl_soc_info *info = ipctl->info;
  85
  86         if (selector >= info->ngroups)
  87                 return -EINVAL;
  88
  89         *pins = info->groups[selector].pin_ids;
  90         *npins = info->groups[selector].npins;
  91
  92         return 0;
  93 }
  94
  95 static void imx_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
  96                    unsigned offset)
  97 {
  98         seq_printf(s, "%s", dev_name(pctldev->dev));
  99 }
 100
 101 static int imx_dt_node_to_map(struct pinctrl_dev *pctldev,
 102                         struct device_node *np,
 103                         struct pinctrl_map **map, unsigned *num_maps)
 104 {
 105         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 106         const struct imx_pinctrl_soc_info *info = ipctl->info;
 107         const struct imx_pin_group *grp;
 108         struct pinctrl_map *new_map;
 109         struct device_node *parent;
 110         int map_num = 1;
 111         int i, j;
 112
 113         /*
 114          * first find the group of this node and check if we need create
 115          * config maps for pins
 116          */
 117         grp = imx_pinctrl_find_group_by_name(info, np->name);
 118         if (!grp) {
 119                 dev_err(info->dev, "unable to find group for node %s\n",
 120                         np->name);
 121                 return -EINVAL;
 122         }
 123
 124         for (i = 0; i < grp->npins; i++) {
 125                 if (!(grp->pins[i].config & IMX_NO_PAD_CTL))
 126                         map_num++;
 127         }
 128
 129         new_map = kmalloc(sizeof(struct pinctrl_map) * map_num, GFP_KERNEL);
 130         if (!new_map)
 131                 return -ENOMEM;
 132
 133         *map = new_map;
 134         *num_maps = map_num;
 135
 136         /* create mux map */
 137         parent = of_get_parent(np);
 138         if (!parent) {
 139                 kfree(new_map);
 140                 return -EINVAL;
 141         }
 142         new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
 143         new_map[0].data.mux.function = parent->name;
 144         new_map[0].data.mux.group = np->name;
 145         of_node_put(parent);
 146
 147         /* create config map */
 148         new_map++;
 149         for (i = j = 0; i < grp->npins; i++) {
 150                 if (!(grp->pins[i].config & IMX_NO_PAD_CTL)) {
 151                         new_map[j].type = PIN_MAP_TYPE_CONFIGS_PIN;
 152                         new_map[j].data.configs.group_or_pin =
 153                                         pin_get_name(pctldev, grp->pins[i].pin);
 154                         new_map[j].data.configs.configs = &grp->pins[i].config;
 155                         new_map[j].data.configs.num_configs = 1;
 156                         j++;
 157                 }
 158         }
 159
 160         dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
 161                 (*map)->data.mux.function, (*map)->data.mux.group, map_num);
 162
 163         return 0;
 164 }
 165
 166 static void imx_dt_free_map(struct pinctrl_dev *pctldev,
 167                                 struct pinctrl_map *map, unsigned num_maps)
 168 {
 169         kfree(map);
 170 }
 171
 172 static const struct pinctrl_ops imx_pctrl_ops = {
 173         .get_groups_count = imx_get_groups_count,
 174         .get_group_name = imx_get_group_name,
 175         .get_group_pins = imx_get_group_pins,
 176         .pin_dbg_show = imx_pin_dbg_show,
 177         .dt_node_to_map = imx_dt_node_to_map,
 178         .dt_free_map = imx_dt_free_map,
 179
 180 };
 181
 182 static int imx_pmx_enable(struct pinctrl_dev *pctldev, unsigned selector,
 183                            unsigned group)
 184 {
 185         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 186         const struct imx_pinctrl_soc_info *info = ipctl->info;
 187         const struct imx_pin_reg *pin_reg;
 188         unsigned int npins, pin_id;
 189         int i;
 190         struct imx_pin_group *grp;
 191
 192         /*
 193          * Configure the mux mode for each pin in the group for a specific
 194          * function.
 195          */
 196         grp = &info->groups[group];
 197         npins = grp->npins;
 198
 199         dev_dbg(ipctl->dev, "enable function %s group %s\n",
 200                 info->functions[selector].name, grp->name);
 201
 202         for (i = 0; i < npins; i++) {
 203                 struct imx_pin *pin = &grp->pins[i];
 204                 pin_id = pin->pin;
 205                 pin_reg = &info->pin_regs[pin_id];
 206
 207                 if (!(info->flags & ZERO_OFFSET_VALID) && !pin_reg->mux_reg) {
 208                         dev_err(ipctl->dev, "Pin(%s) does not support mux function\n",
 209                                 info->pins[pin_id].name);
 210                         return -EINVAL;
 211                 }
 212
 213                 if (info->flags & SHARE_MUX_CONF_REG) {
 214                         u32 reg;
 215                         reg = readl(ipctl->base + pin_reg->mux_reg);
 216                         reg &= ~(0x7 << 20);
 217                         reg |= (pin->mux_mode << 20);
 218                         writel(reg, ipctl->base + pin_reg->mux_reg);
 219                 } else {
 220                         writel(pin->mux_mode, ipctl->base + pin_reg->mux_reg);
 221                 }
 222                 dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%x\n",
 223                         pin_reg->mux_reg, pin->mux_mode);
 224
 225                 /*
 226                  * If the select input value begins with 0xff, it's a quirky
 227                  * select input and the value should be interpreted as below.
 228                  *     31     23      15      7        0
 229                  *     | 0xff | shift | width | select |
 230                  * It's used to work around the problem that the select
 231                  * input for some pin is not implemented in the select
 232                  * input register but in some general purpose register.
 233                  * We encode the select input value, width and shift of
 234                  * the bit field into input_val cell of pin function ID
 235                  * in device tree, and then decode them here for setting
 236                  * up the select input bits in general purpose register.
 237                  */
 238                 if (pin->input_val >> 24 == 0xff) {
 239                         u32 val = pin->input_val;
 240                         u8 select = val & 0xff;
 241                         u8 width = (val >> 8) & 0xff;
 242                         u8 shift = (val >> 16) & 0xff;
 243                         u32 mask = ((1 << width) - 1) << shift;
 244                         /*
 245                          * The input_reg[i] here is actually some IOMUXC general
 246                          * purpose register, not regular select input register.
 247                          */
 248                         val = readl(ipctl->base + pin->input_val);
 249                         val &= ~mask;
 250                         val |= select << shift;
 251                         writel(val, ipctl->base + pin->input_val);
 252                 } else if (pin->input_val) {
 253                         /*
 254                          * Regular select input register can never be at offset
 255                          * 0, and we only print register value for regular case.
 256                          */
 257                         writel(pin->input_val, ipctl->base + pin->input_reg);
 258                         dev_dbg(ipctl->dev,
 259                                 "==>select_input: offset 0x%x val 0x%x\n",
 260                                 pin->input_reg, pin->input_val);
 261                 }
 262         }
 263
 264         return 0;
 265 }
 266
 267 static int imx_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
 268 {
 269         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 270         const struct imx_pinctrl_soc_info *info = ipctl->info;
 271
 272         return info->nfunctions;
 273 }
 274
 275 static const char *imx_pmx_get_func_name(struct pinctrl_dev *pctldev,
 276                                           unsigned selector)
 277 {
 278         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 279         const struct imx_pinctrl_soc_info *info = ipctl->info;
 280
 281         return info->functions[selector].name;
 282 }
 283
 284 static int imx_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
 285                                const char * const **groups,
 286                                unsigned * const num_groups)
 287 {
 288         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 289         const struct imx_pinctrl_soc_info *info = ipctl->info;
 290
 291         *groups = info->functions[selector].groups;
 292         *num_groups = info->functions[selector].num_groups;
 293
 294         return 0;
 295 }
 296
 297 static const struct pinmux_ops imx_pmx_ops = {
 298         .get_functions_count = imx_pmx_get_funcs_count,
 299         .get_function_name = imx_pmx_get_func_name,
 300         .get_function_groups = imx_pmx_get_groups,
 301         .enable = imx_pmx_enable,
 302 };
 303
 304 static int imx_pinconf_get(struct pinctrl_dev *pctldev,
 305                              unsigned pin_id, unsigned long *config)
 306 {
 307         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 308         const struct imx_pinctrl_soc_info *info = ipctl->info;
 309         const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
 310
 311         if (!(info->flags & ZERO_OFFSET_VALID) && !pin_reg->conf_reg) {
 312                 dev_err(info->dev, "Pin(%s) does not support config function\n",
 313                         info->pins[pin_id].name);
 314                 return -EINVAL;
 315         }
 316
 317         *config = readl(ipctl->base + pin_reg->conf_reg);
 318
 319         if (info->flags & SHARE_MUX_CONF_REG)
 320                 *config &= 0xffff;
 321
 322         return 0;
 323 }
 324
 325 static int imx_pinconf_set(struct pinctrl_dev *pctldev,
 326                              unsigned pin_id, unsigned long *configs,
 327                              unsigned num_configs)
 328 {
 329         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 330         const struct imx_pinctrl_soc_info *info = ipctl->info;
 331         const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
 332         int i;
 333
 334         if (!(info->flags & ZERO_OFFSET_VALID) && !pin_reg->conf_reg) {
 335                 dev_err(info->dev, "Pin(%s) does not support config function\n",
 336                         info->pins[pin_id].name);
 337                 return -EINVAL;
 338         }
 339
 340         dev_dbg(ipctl->dev, "pinconf set pin %s\n",
 341                 info->pins[pin_id].name);
 342
 343         for (i = 0; i < num_configs; i++) {
 344                 if (info->flags & SHARE_MUX_CONF_REG) {
 345                         u32 reg;
 346                         reg = readl(ipctl->base + pin_reg->conf_reg);
 347                         reg &= ~0xffff;
 348                         reg |= configs[i];
 349                         writel(reg, ipctl->base + pin_reg->conf_reg);
 350                 } else {
 351                         writel(configs[i], ipctl->base + pin_reg->conf_reg);
 352                 }
 353                 dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%lx\n",
 354                         pin_reg->conf_reg, configs[i]);
 355         } /* for each config */
 356
 357         return 0;
 358 }
 359
 360 static void imx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 361                                    struct seq_file *s, unsigned pin_id)
 362 {
 363         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 364         const struct imx_pinctrl_soc_info *info = ipctl->info;
 365         const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
 366         unsigned long config;
 367
 368         if (!pin_reg || !pin_reg->conf_reg) {
 369                 seq_printf(s, "N/A");
 370                 return;
 371         }
 372
 373         config = readl(ipctl->base + pin_reg->conf_reg);
 374         seq_printf(s, "0x%lx", config);
 375 }
 376
 377 static void imx_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 378                                          struct seq_file *s, unsigned group)
 379 {
 380         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 381         const struct imx_pinctrl_soc_info *info = ipctl->info;
 382         struct imx_pin_group *grp;
 383         unsigned long config;
 384         const char *name;
 385         int i, ret;
 386
 387         if (group > info->ngroups)
 388                 return;
 389
 390         seq_printf(s, "\n");
 391         grp = &info->groups[group];
 392         for (i = 0; i < grp->npins; i++) {
 393                 struct imx_pin *pin = &grp->pins[i];
 394                 name = pin_get_name(pctldev, pin->pin);
 395                 ret = imx_pinconf_get(pctldev, pin->pin, &config);
 396                 if (ret)
 397                         return;
 398                 seq_printf(s, "%s: 0x%lx", name, config);
 399         }
 400 }
 401
 402 static const struct pinconf_ops imx_pinconf_ops = {
 403         .pin_config_get = imx_pinconf_get,
 404         .pin_config_set = imx_pinconf_set,
 405         .pin_config_dbg_show = imx_pinconf_dbg_show,
 406         .pin_config_group_dbg_show = imx_pinconf_group_dbg_show,
 407 };
 408
 409 static struct pinctrl_desc imx_pinctrl_desc = {
 410         .pctlops = &imx_pctrl_ops,
 411         .pmxops = &imx_pmx_ops,
 412         .confops = &imx_pinconf_ops,
 413         .owner = THIS_MODULE,
 414 };
 415
 416 /*
 417  * Each pin represented in fsl,pins consists of 5 u32 PIN_FUNC_ID and
 418  * 1 u32 CONFIG, so 24 types in total for each pin.
 419  */
 420 #define FSL_PIN_SIZE 24
 421 #define SHARE_FSL_PIN_SIZE 20
 422
 423 static int imx_pinctrl_parse_groups(struct device_node *np,
 424                                     struct imx_pin_group *grp,
 425                                     struct imx_pinctrl_soc_info *info,
 426                                     u32 index)
 427 {
 428         int size, pin_size;
 429         const __be32 *list;
 430         int i;
 431         u32 config;
 432
 433         dev_dbg(info->dev, "group(%d): %s\n", index, np->name);
 434
 435         if (info->flags & SHARE_MUX_CONF_REG)
 436                 pin_size = SHARE_FSL_PIN_SIZE;
 437         else
 438                 pin_size = FSL_PIN_SIZE;
 439         /* Initialise group */
 440         grp->name = np->name;
 441
 442         /*
 443          * the binding format is fsl,pins = <PIN_FUNC_ID CONFIG ...>,
 444          * do sanity check and calculate pins number
 445          */
 446         list = of_get_property(np, "fsl,pins", &size);
 447         if (!list) {
 448                 dev_err(info->dev, "no fsl,pins property in node %s\n", np->full_name);
 449                 return -EINVAL;
 450         }
 451
 452         /* we do not check return since it's safe node passed down */
 453         if (!size || size % pin_size) {
 454                 dev_err(info->dev, "Invalid fsl,pins property in node %s\n", np->full_name);
 455                 return -EINVAL;
 456         }
 457
 458         grp->npins = size / pin_size;
 459         grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(struct imx_pin),
 460                                 GFP_KERNEL);
 461         grp->pin_ids = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
 462                                 GFP_KERNEL);
 463         if (!grp->pins || ! grp->pin_ids)
 464                 return -ENOMEM;
 465
 466         for (i = 0; i < grp->npins; i++) {
 467                 u32 mux_reg = be32_to_cpu(*list++);
 468                 u32 conf_reg;
 469                 unsigned int pin_id;
 470                 struct imx_pin_reg *pin_reg;
 471                 struct imx_pin *pin = &grp->pins[i];
 472
 473                 if (info->flags & SHARE_MUX_CONF_REG)
 474                         conf_reg = mux_reg;
 475                 else
 476                         conf_reg = be32_to_cpu(*list++);
 477
 478                 pin_id = mux_reg ? mux_reg / 4 : conf_reg / 4;
 479                 pin_reg = &info->pin_regs[pin_id];
 480                 pin->pin = pin_id;
 481                 grp->pin_ids[i] = pin_id;
 482                 pin_reg->mux_reg = mux_reg;
 483                 pin_reg->conf_reg = conf_reg;
 484                 pin->input_reg = be32_to_cpu(*list++);
 485                 pin->mux_mode = be32_to_cpu(*list++);
 486                 pin->input_val = be32_to_cpu(*list++);
 487
 488                 /* SION bit is in mux register */
 489                 config = be32_to_cpu(*list++);
 490                 if (config & IMX_PAD_SION)
 491                         pin->mux_mode |= IOMUXC_CONFIG_SION;
 492                 pin->config = config & ~IMX_PAD_SION;
 493
 494                 dev_dbg(info->dev, "%s: %d 0x%08lx", info->pins[i].name,
 495                                 pin->mux_mode, pin->config);
 496         }
 497
 498         return 0;
 499 }
 500
 501 static int imx_pinctrl_parse_functions(struct device_node *np,
 502                                        struct imx_pinctrl_soc_info *info,
 503                                        u32 index)
 504 {
 505         struct device_node *child;
 506         struct imx_pmx_func *func;
 507         struct imx_pin_group *grp;
 508         static u32 grp_index;
 509         u32 i = 0;
 510
 511         dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
 512
 513         func = &info->functions[index];
 514
 515         /* Initialise function */
 516         func->name = np->name;
 517         func->num_groups = of_get_child_count(np);
 518         if (func->num_groups <= 0) {
 519                 dev_err(info->dev, "no groups defined in %s\n", np->full_name);
 520                 return -EINVAL;
 521         }
 522         func->groups = devm_kzalloc(info->dev,
 523                         func->num_groups * sizeof(char *), GFP_KERNEL);
 524
 525         for_each_child_of_node(np, child) {
 526                 func->groups[i] = child->name;
 527                 grp = &info->groups[grp_index++];
 528                 imx_pinctrl_parse_groups(child, grp, info, i++);
 529         }
 530
 531         return 0;
 532 }
 533
 534 static int imx_pinctrl_probe_dt(struct platform_device *pdev,
 535                                 struct imx_pinctrl_soc_info *info)
 536 {
 537         struct device_node *np = pdev->dev.of_node;
 538         struct device_node *child;
 539         u32 nfuncs = 0;
 540         u32 i = 0;
 541
 542         if (!np)
 543                 return -ENODEV;
 544
 545         nfuncs = of_get_child_count(np);
 546         if (nfuncs <= 0) {
 547                 dev_err(&pdev->dev, "no functions defined\n");
 548                 return -EINVAL;
 549         }
 550
 551         info->nfunctions = nfuncs;
 552         info->functions = devm_kzalloc(&pdev->dev, nfuncs * sizeof(struct imx_pmx_func),
 553                                         GFP_KERNEL);
 554         if (!info->functions)
 555                 return -ENOMEM;
 556
 557         info->ngroups = 0;
 558         for_each_child_of_node(np, child)
 559                 info->ngroups += of_get_child_count(child);
 560         info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct imx_pin_group),
 561                                         GFP_KERNEL);
 562         if (!info->groups)
 563                 return -ENOMEM;
 564
 565         for_each_child_of_node(np, child)
 566                 imx_pinctrl_parse_functions(child, info, i++);
 567
 568         return 0;
 569 }
 570
 571 int imx_pinctrl_probe(struct platform_device *pdev,
 572                       struct imx_pinctrl_soc_info *info)
 573 {
 574         struct imx_pinctrl *ipctl;
 575         struct resource *res;
 576         int ret;
 577
 578         if (!info || !info->pins || !info->npins) {
 579                 dev_err(&pdev->dev, "wrong pinctrl info\n");
 580                 return -EINVAL;
 581         }
 582         info->dev = &pdev->dev;
 583
 584         /* Create state holders etc for this driver */
 585         ipctl = devm_kzalloc(&pdev->dev, sizeof(*ipctl), GFP_KERNEL);
 586         if (!ipctl)
 587                 return -ENOMEM;
 588
 589         info->pin_regs = devm_kzalloc(&pdev->dev, sizeof(*info->pin_regs) *
 590                                       info->npins, GFP_KERNEL);
 591         if (!info->pin_regs)
 592                 return -ENOMEM;
 593
 594         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 595         ipctl->base = devm_ioremap_resource(&pdev->dev, res);
 596         if (IS_ERR(ipctl->base))
 597                 return PTR_ERR(ipctl->base);
 598
 599         imx_pinctrl_desc.name = dev_name(&pdev->dev);
 600         imx_pinctrl_desc.pins = info->pins;
 601         imx_pinctrl_desc.npins = info->npins;
 602
 603         ret = imx_pinctrl_probe_dt(pdev, info);
 604         if (ret) {
 605                 dev_err(&pdev->dev, "fail to probe dt properties\n");
 606                 return ret;
 607         }
 608
 609         ipctl->info = info;
 610         ipctl->dev = info->dev;
 611         platform_set_drvdata(pdev, ipctl);
 612         ipctl->pctl = pinctrl_register(&imx_pinctrl_desc, &pdev->dev, ipctl);
 613         if (!ipctl->pctl) {
 614                 dev_err(&pdev->dev, "could not register IMX pinctrl driver\n");
 615                 return -EINVAL;
 616         }
 617
 618         dev_info(&pdev->dev, "initialized IMX pinctrl driver\n");
 619
 620         return 0;
 621 }
 622
 623 int imx_pinctrl_remove(struct platform_device *pdev)
 624 {
 625         struct imx_pinctrl *ipctl = platform_get_drvdata(pdev);
 626
 627         pinctrl_unregister(ipctl->pctl);
 628
 629         return 0;
 630 }