drivers/pinctrl/freescale/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_set(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 (pin_reg->mux_reg == -1) {
 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_reg);
 249                         val &= ~mask;
 250                         val |= select << shift;
 251                         writel(val, ipctl->base + pin->input_reg);
 252                 } else if (pin->input_reg) {
 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 int imx_pmx_gpio_request_enable(struct pinctrl_dev *pctldev,
 298                         struct pinctrl_gpio_range *range, unsigned offset)
 299 {
 300         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 301         const struct imx_pinctrl_soc_info *info = ipctl->info;
 302         const struct imx_pin_reg *pin_reg;
 303         struct imx_pin_group *grp;
 304         struct imx_pin *imx_pin;
 305         unsigned int pin, group;
 306         u32 reg;
 307
 308         /* Currently implementation only for shared mux/conf register */
 309         if (!(info->flags & SHARE_MUX_CONF_REG))
 310                 return -EINVAL;
 311
 312         pin_reg = &info->pin_regs[offset];
 313         if (pin_reg->mux_reg == -1)
 314                 return -EINVAL;
 315
 316         /* Find the pinctrl config with GPIO mux mode for the requested pin */
 317         for (group = 0; group < info->ngroups; group++) {
 318                 grp = &info->groups[group];
 319                 for (pin = 0; pin < grp->npins; pin++) {
 320                         imx_pin = &grp->pins[pin];
 321                         if (imx_pin->pin == offset && !imx_pin->mux_mode)
 322                                 goto mux_pin;
 323                 }
 324         }
 325
 326         return -EINVAL;
 327
 328 mux_pin:
 329         reg = readl(ipctl->base + pin_reg->mux_reg);
 330         reg &= ~(0x7 << 20);
 331         reg |= imx_pin->config;
 332         writel(reg, ipctl->base + pin_reg->mux_reg);
 333
 334         return 0;
 335 }
 336
 337 static int imx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
 338            struct pinctrl_gpio_range *range, unsigned offset, bool input)
 339 {
 340         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 341         const struct imx_pinctrl_soc_info *info = ipctl->info;
 342         const struct imx_pin_reg *pin_reg;
 343         u32 reg;
 344
 345         /*
 346          * Only Vybrid has the input/output buffer enable flags (IBE/OBE)
 347          * They are part of the shared mux/conf register.
 348          */
 349         if (!(info->flags & SHARE_MUX_CONF_REG))
 350                 return -EINVAL;
 351
 352         pin_reg = &info->pin_regs[offset];
 353         if (pin_reg->mux_reg == -1)
 354                 return -EINVAL;
 355
 356         /* IBE always enabled allows us to read the value "on the wire" */
 357         reg = readl(ipctl->base + pin_reg->mux_reg);
 358         if (input)
 359                 reg &= ~0x2;
 360         else
 361                 reg |= 0x2;
 362         writel(reg, ipctl->base + pin_reg->mux_reg);
 363
 364         return 0;
 365 }
 366
 367 static const struct pinmux_ops imx_pmx_ops = {
 368         .get_functions_count = imx_pmx_get_funcs_count,
 369         .get_function_name = imx_pmx_get_func_name,
 370         .get_function_groups = imx_pmx_get_groups,
 371         .set_mux = imx_pmx_set,
 372         .gpio_request_enable = imx_pmx_gpio_request_enable,
 373         .gpio_set_direction = imx_pmx_gpio_set_direction,
 374 };
 375
 376 static int imx_pinconf_get(struct pinctrl_dev *pctldev,
 377                              unsigned pin_id, unsigned long *config)
 378 {
 379         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 380         const struct imx_pinctrl_soc_info *info = ipctl->info;
 381         const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
 382
 383         if (pin_reg->conf_reg == -1) {
 384                 dev_err(info->dev, "Pin(%s) does not support config function\n",
 385                         info->pins[pin_id].name);
 386                 return -EINVAL;
 387         }
 388
 389         *config = readl(ipctl->base + pin_reg->conf_reg);
 390
 391         if (info->flags & SHARE_MUX_CONF_REG)
 392                 *config &= 0xffff;
 393
 394         return 0;
 395 }
 396
 397 static int imx_pinconf_set(struct pinctrl_dev *pctldev,
 398                              unsigned pin_id, unsigned long *configs,
 399                              unsigned num_configs)
 400 {
 401         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 402         const struct imx_pinctrl_soc_info *info = ipctl->info;
 403         const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
 404         int i;
 405
 406         if (pin_reg->conf_reg == -1) {
 407                 dev_err(info->dev, "Pin(%s) does not support config function\n",
 408                         info->pins[pin_id].name);
 409                 return -EINVAL;
 410         }
 411
 412         dev_dbg(ipctl->dev, "pinconf set pin %s\n",
 413                 info->pins[pin_id].name);
 414
 415         for (i = 0; i < num_configs; i++) {
 416                 if (info->flags & SHARE_MUX_CONF_REG) {
 417                         u32 reg;
 418                         reg = readl(ipctl->base + pin_reg->conf_reg);
 419                         reg &= ~0xffff;
 420                         reg |= configs[i];
 421                         writel(reg, ipctl->base + pin_reg->conf_reg);
 422                 } else {
 423                         writel(configs[i], ipctl->base + pin_reg->conf_reg);
 424                 }
 425                 dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%lx\n",
 426                         pin_reg->conf_reg, configs[i]);
 427         } /* for each config */
 428
 429         return 0;
 430 }
 431
 432 static void imx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 433                                    struct seq_file *s, unsigned pin_id)
 434 {
 435         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 436         const struct imx_pinctrl_soc_info *info = ipctl->info;
 437         const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
 438         unsigned long config;
 439
 440         if (!pin_reg || pin_reg->conf_reg == -1) {
 441                 seq_printf(s, "N/A");
 442                 return;
 443         }
 444
 445         config = readl(ipctl->base + pin_reg->conf_reg);
 446         seq_printf(s, "0x%lx", config);
 447 }
 448
 449 static void imx_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 450                                          struct seq_file *s, unsigned group)
 451 {
 452         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 453         const struct imx_pinctrl_soc_info *info = ipctl->info;
 454         struct imx_pin_group *grp;
 455         unsigned long config;
 456         const char *name;
 457         int i, ret;
 458
 459         if (group > info->ngroups)
 460                 return;
 461
 462         seq_printf(s, "\n");
 463         grp = &info->groups[group];
 464         for (i = 0; i < grp->npins; i++) {
 465                 struct imx_pin *pin = &grp->pins[i];
 466                 name = pin_get_name(pctldev, pin->pin);
 467                 ret = imx_pinconf_get(pctldev, pin->pin, &config);
 468                 if (ret)
 469                         return;
 470                 seq_printf(s, "%s: 0x%lx", name, config);
 471         }
 472 }
 473
 474 static const struct pinconf_ops imx_pinconf_ops = {
 475         .pin_config_get = imx_pinconf_get,
 476         .pin_config_set = imx_pinconf_set,
 477         .pin_config_dbg_show = imx_pinconf_dbg_show,
 478         .pin_config_group_dbg_show = imx_pinconf_group_dbg_show,
 479 };
 480
 481 static struct pinctrl_desc imx_pinctrl_desc = {
 482         .pctlops = &imx_pctrl_ops,
 483         .pmxops = &imx_pmx_ops,
 484         .confops = &imx_pinconf_ops,
 485         .owner = THIS_MODULE,
 486 };
 487
 488 /*
 489  * Each pin represented in fsl,pins consists of 5 u32 PIN_FUNC_ID and
 490  * 1 u32 CONFIG, so 24 types in total for each pin.
 491  */
 492 #define FSL_PIN_SIZE 24
 493 #define SHARE_FSL_PIN_SIZE 20
 494
 495 static int imx_pinctrl_parse_groups(struct device_node *np,
 496                                     struct imx_pin_group *grp,
 497                                     struct imx_pinctrl_soc_info *info,
 498                                     u32 index)
 499 {
 500         int size, pin_size;
 501         const __be32 *list;
 502         int i;
 503         u32 config;
 504
 505         dev_dbg(info->dev, "group(%d): %s\n", index, np->name);
 506
 507         if (info->flags & SHARE_MUX_CONF_REG)
 508                 pin_size = SHARE_FSL_PIN_SIZE;
 509         else
 510                 pin_size = FSL_PIN_SIZE;
 511         /* Initialise group */
 512         grp->name = np->name;
 513
 514         /*
 515          * the binding format is fsl,pins = <PIN_FUNC_ID CONFIG ...>,
 516          * do sanity check and calculate pins number
 517          */
 518         list = of_get_property(np, "fsl,pins", &size);
 519         if (!list) {
 520                 dev_err(info->dev, "no fsl,pins property in node %s\n", np->full_name);
 521                 return -EINVAL;
 522         }
 523
 524         /* we do not check return since it's safe node passed down */
 525         if (!size || size % pin_size) {
 526                 dev_err(info->dev, "Invalid fsl,pins property in node %s\n", np->full_name);
 527                 return -EINVAL;
 528         }
 529
 530         grp->npins = size / pin_size;
 531         grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(struct imx_pin),
 532                                 GFP_KERNEL);
 533         grp->pin_ids = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
 534                                 GFP_KERNEL);
 535         if (!grp->pins || ! grp->pin_ids)
 536                 return -ENOMEM;
 537
 538         for (i = 0; i < grp->npins; i++) {
 539                 u32 mux_reg = be32_to_cpu(*list++);
 540                 u32 conf_reg;
 541                 unsigned int pin_id;
 542                 struct imx_pin_reg *pin_reg;
 543                 struct imx_pin *pin = &grp->pins[i];
 544
 545                 if (info->flags & SHARE_MUX_CONF_REG) {
 546                         conf_reg = mux_reg;
 547                 } else {
 548                         conf_reg = be32_to_cpu(*list++);
 549                         if (!conf_reg)
 550                                 conf_reg = -1;
 551                 }
 552
 553                 pin_id = mux_reg ? mux_reg / 4 : conf_reg / 4;
 554                 pin_reg = &info->pin_regs[pin_id];
 555                 pin->pin = pin_id;
 556                 grp->pin_ids[i] = pin_id;
 557                 pin_reg->mux_reg = mux_reg;
 558                 pin_reg->conf_reg = conf_reg;
 559                 pin->input_reg = be32_to_cpu(*list++);
 560                 pin->mux_mode = be32_to_cpu(*list++);
 561                 pin->input_val = be32_to_cpu(*list++);
 562
 563                 /* SION bit is in mux register */
 564                 config = be32_to_cpu(*list++);
 565                 if (config & IMX_PAD_SION)
 566                         pin->mux_mode |= IOMUXC_CONFIG_SION;
 567                 pin->config = config & ~IMX_PAD_SION;
 568
 569                 dev_dbg(info->dev, "%s: 0x%x 0x%08lx", info->pins[pin_id].name,
 570                                 pin->mux_mode, pin->config);
 571         }
 572
 573         return 0;
 574 }
 575
 576 static int imx_pinctrl_parse_functions(struct device_node *np,
 577                                        struct imx_pinctrl_soc_info *info,
 578                                        u32 index)
 579 {
 580         struct device_node *child;
 581         struct imx_pmx_func *func;
 582         struct imx_pin_group *grp;
 583         static u32 grp_index;
 584         u32 i = 0;
 585
 586         dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
 587
 588         func = &info->functions[index];
 589
 590         /* Initialise function */
 591         func->name = np->name;
 592         func->num_groups = of_get_child_count(np);
 593         if (func->num_groups == 0) {
 594                 dev_err(info->dev, "no groups defined in %s\n", np->full_name);
 595                 return -EINVAL;
 596         }
 597         func->groups = devm_kzalloc(info->dev,
 598                         func->num_groups * sizeof(char *), GFP_KERNEL);
 599
 600         for_each_child_of_node(np, child) {
 601                 func->groups[i] = child->name;
 602                 grp = &info->groups[grp_index++];
 603                 imx_pinctrl_parse_groups(child, grp, info, i++);
 604         }
 605
 606         return 0;
 607 }
 608
 609 /*
 610  * Check if the DT contains pins in the direct child nodes. This indicates the
 611  * newer DT format to store pins. This function returns true if the first found
 612  * fsl,pins property is in a child of np. Otherwise false is returned.
 613  */
 614 static bool imx_pinctrl_dt_is_flat_functions(struct device_node *np)
 615 {
 616         struct device_node *function_np;
 617         struct device_node *pinctrl_np;
 618
 619         for_each_child_of_node(np, function_np) {
 620                 if (of_property_read_bool(function_np, "fsl,pins"))
 621                         return true;
 622
 623                 for_each_child_of_node(function_np, pinctrl_np) {
 624                         if (of_property_read_bool(pinctrl_np, "fsl,pins"))
 625                                 return false;
 626                 }
 627         }
 628
 629         return true;
 630 }
 631
 632 static int imx_pinctrl_probe_dt(struct platform_device *pdev,
 633                                 struct imx_pinctrl_soc_info *info)
 634 {
 635         struct device_node *np = pdev->dev.of_node;
 636         struct device_node *child;
 637         u32 nfuncs = 0;
 638         u32 i = 0;
 639         bool flat_funcs;
 640
 641         if (!np)
 642                 return -ENODEV;
 643
 644         flat_funcs = imx_pinctrl_dt_is_flat_functions(np);
 645         if (flat_funcs) {
 646                 nfuncs = 1;
 647         } else {
 648                 nfuncs = of_get_child_count(np);
 649                 if (nfuncs <= 0) {
 650                         dev_err(&pdev->dev, "no functions defined\n");
 651                         return -EINVAL;
 652                 }
 653         }
 654
 655         info->nfunctions = nfuncs;
 656         info->functions = devm_kzalloc(&pdev->dev, nfuncs * sizeof(struct imx_pmx_func),
 657                                         GFP_KERNEL);
 658         if (!info->functions)
 659                 return -ENOMEM;
 660
 661         if (flat_funcs) {
 662                 info->ngroups = of_get_child_count(np);
 663         } else {
 664                 info->ngroups = 0;
 665                 for_each_child_of_node(np, child)
 666                         info->ngroups += of_get_child_count(child);
 667         }
 668         info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct imx_pin_group),
 669                                         GFP_KERNEL);
 670         if (!info->groups)
 671                 return -ENOMEM;
 672
 673         if (flat_funcs) {
 674                 imx_pinctrl_parse_functions(np, info, 0);
 675         } else {
 676                 for_each_child_of_node(np, child)
 677                         imx_pinctrl_parse_functions(child, info, i++);
 678         }
 679
 680         return 0;
 681 }
 682
 683 int imx_pinctrl_probe(struct platform_device *pdev,
 684                       struct imx_pinctrl_soc_info *info)
 685 {
 686         struct imx_pinctrl *ipctl;
 687         struct resource *res;
 688         int ret, i;
 689
 690         if (!info || !info->pins || !info->npins) {
 691                 dev_err(&pdev->dev, "wrong pinctrl info\n");
 692                 return -EINVAL;
 693         }
 694         info->dev = &pdev->dev;
 695
 696         /* Create state holders etc for this driver */
 697         ipctl = devm_kzalloc(&pdev->dev, sizeof(*ipctl), GFP_KERNEL);
 698         if (!ipctl)
 699                 return -ENOMEM;
 700
 701         info->pin_regs = devm_kmalloc(&pdev->dev, sizeof(*info->pin_regs) *
 702                                       info->npins, GFP_KERNEL);
 703         if (!info->pin_regs)
 704                 return -ENOMEM;
 705
 706         for (i = 0; i < info->npins; i++) {
 707                 info->pin_regs[i].mux_reg = -1;
 708                 info->pin_regs[i].conf_reg = -1;
 709         }
 710
 711         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 712         ipctl->base = devm_ioremap_resource(&pdev->dev, res);
 713         if (IS_ERR(ipctl->base))
 714                 return PTR_ERR(ipctl->base);
 715
 716         imx_pinctrl_desc.name = dev_name(&pdev->dev);
 717         imx_pinctrl_desc.pins = info->pins;
 718         imx_pinctrl_desc.npins = info->npins;
 719
 720         ret = imx_pinctrl_probe_dt(pdev, info);
 721         if (ret) {
 722                 dev_err(&pdev->dev, "fail to probe dt properties\n");
 723                 return ret;
 724         }
 725
 726         ipctl->info = info;
 727         ipctl->dev = info->dev;
 728         platform_set_drvdata(pdev, ipctl);
 729         ipctl->pctl = pinctrl_register(&imx_pinctrl_desc, &pdev->dev, ipctl);
 730         if (IS_ERR(ipctl->pctl)) {
 731                 dev_err(&pdev->dev, "could not register IMX pinctrl driver\n");
 732                 return PTR_ERR(ipctl->pctl);
 733         }
 734
 735         dev_info(&pdev->dev, "initialized IMX pinctrl driver\n");
 736
 737         return 0;
 738 }
 739
 740 int imx_pinctrl_remove(struct platform_device *pdev)
 741 {
 742         struct imx_pinctrl *ipctl = platform_get_drvdata(pdev);
 743
 744         pinctrl_unregister(ipctl->pctl);
 745
 746         return 0;
 747 }