drivers/pinctrl/pinctrl-single.c

   1 /*
   2  * Generic device tree based pinctrl driver for one register per pin
   3  * type pinmux controllers
   4  *
   5  * Copyright (C) 2012 Texas Instruments, Inc.
   6  *
   7  * This file is licensed under the terms of the GNU General Public
   8  * License version 2. This program is licensed "as is" without any
   9  * warranty of any kind, whether express or implied.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/io.h>
  15 #include <linux/slab.h>
  16 #include <linux/err.h>
  17 #include <linux/list.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/irqchip/chained_irq.h>
  20 #include <linux/of.h>
  21 #include <linux/of_device.h>
  22 #include <linux/of_address.h>
  23 #include <linux/of_irq.h>
  24 #include <linux/seq_file.h>
  25
  26 #include <linux/pinctrl/pinconf-generic.h>
  27 #include <linux/pinctrl/pinconf.h>
  28 #include <linux/pinctrl/pinctrl.h>
  29 #include <linux/pinctrl/pinmux.h>
  30
  31 #include <linux/platform_data/pinctrl-single.h>
  32
  33 #include "core.h"
  34 #include "devicetree.h"
  35 #include "pinconf.h"
  36 #include "pinmux.h"
  37
  38 #define DRIVER_NAME                     "pinctrl-single"
  39 #define PCS_OFF_DISABLED                ~0U
  40
  41 /**
  42  * struct pcs_func_vals - mux function register offset and value pair
  43  * @reg:        register virtual address
  44  * @val:        register value
  45  * @mask:       mask
  46  */
  47 struct pcs_func_vals {
  48         void __iomem *reg;
  49         unsigned val;
  50         unsigned mask;
  51 };
  52
  53 /**
  54  * struct pcs_conf_vals - pinconf parameter, pinconf register offset
  55  * and value, enable, disable, mask
  56  * @param:      config parameter
  57  * @val:        user input bits in the pinconf register
  58  * @enable:     enable bits in the pinconf register
  59  * @disable:    disable bits in the pinconf register
  60  * @mask:       mask bits in the register value
  61  */
  62 struct pcs_conf_vals {
  63         enum pin_config_param param;
  64         unsigned val;
  65         unsigned enable;
  66         unsigned disable;
  67         unsigned mask;
  68 };
  69
  70 /**
  71  * struct pcs_conf_type - pinconf property name, pinconf param pair
  72  * @name:       property name in DTS file
  73  * @param:      config parameter
  74  */
  75 struct pcs_conf_type {
  76         const char *name;
  77         enum pin_config_param param;
  78 };
  79
  80 /**
  81  * struct pcs_function - pinctrl function
  82  * @name:       pinctrl function name
  83  * @vals:       register and vals array
  84  * @nvals:      number of entries in vals array
  85  * @pgnames:    array of pingroup names the function uses
  86  * @npgnames:   number of pingroup names the function uses
  87  * @conf:       array of pin configurations
  88  * @nconfs:     number of pin configurations available
  89  * @node:       list node
  90  */
  91 struct pcs_function {
  92         const char *name;
  93         struct pcs_func_vals *vals;
  94         unsigned nvals;
  95         const char **pgnames;
  96         int npgnames;
  97         struct pcs_conf_vals *conf;
  98         int nconfs;
  99         struct list_head node;
 100 };
 101
 102 /**
 103  * struct pcs_gpiofunc_range - pin ranges with same mux value of gpio function
 104  * @offset:     offset base of pins
 105  * @npins:      number pins with the same mux value of gpio function
 106  * @gpiofunc:   mux value of gpio function
 107  * @node:       list node
 108  */
 109 struct pcs_gpiofunc_range {
 110         unsigned offset;
 111         unsigned npins;
 112         unsigned gpiofunc;
 113         struct list_head node;
 114 };
 115
 116 /**
 117  * struct pcs_data - wrapper for data needed by pinctrl framework
 118  * @pa:         pindesc array
 119  * @cur:        index to current element
 120  *
 121  * REVISIT: We should be able to drop this eventually by adding
 122  * support for registering pins individually in the pinctrl
 123  * framework for those drivers that don't need a static array.
 124  */
 125 struct pcs_data {
 126         struct pinctrl_pin_desc *pa;
 127         int cur;
 128 };
 129
 130 /**
 131  * struct pcs_soc_data - SoC specific settings
 132  * @flags:      initial SoC specific PCS_FEAT_xxx values
 133  * @irq:        optional interrupt for the controller
 134  * @irq_enable_mask:    optional SoC specific interrupt enable mask
 135  * @irq_status_mask:    optional SoC specific interrupt status mask
 136  * @rearm:      optional SoC specific wake-up rearm function
 137  */
 138 struct pcs_soc_data {
 139         unsigned flags;
 140         int irq;
 141         unsigned irq_enable_mask;
 142         unsigned irq_status_mask;
 143         void (*rearm)(void);
 144 };
 145
 146 /**
 147  * struct pcs_device - pinctrl device instance
 148  * @res:        resources
 149  * @base:       virtual address of the controller
 150  * @saved_vals: saved values for the controller
 151  * @size:       size of the ioremapped area
 152  * @dev:        device entry
 153  * @np:         device tree node
 154  * @pctl:       pin controller device
 155  * @flags:      mask of PCS_FEAT_xxx values
 156  * @missing_nr_pinctrl_cells: for legacy binding, may go away
 157  * @socdata:    soc specific data
 158  * @lock:       spinlock for register access
 159  * @mutex:      mutex protecting the lists
 160  * @width:      bits per mux register
 161  * @fmask:      function register mask
 162  * @fshift:     function register shift
 163  * @foff:       value to turn mux off
 164  * @fmax:       max number of functions in fmask
 165  * @bits_per_mux: number of bits per mux
 166  * @bits_per_pin: number of bits per pin
 167  * @pins:       physical pins on the SoC
 168  * @gpiofuncs:  list of gpio functions
 169  * @irqs:       list of interrupt registers
 170  * @chip:       chip container for this instance
 171  * @domain:     IRQ domain for this instance
 172  * @desc:       pin controller descriptor
 173  * @read:       register read function to use
 174  * @write:      register write function to use
 175  */
 176 struct pcs_device {
 177         struct resource *res;
 178         void __iomem *base;
 179         void *saved_vals;
 180         unsigned size;
 181         struct device *dev;
 182         struct device_node *np;
 183         struct pinctrl_dev *pctl;
 184         unsigned flags;
 185 #define PCS_CONTEXT_LOSS_OFF    (1 << 3)
 186 #define PCS_QUIRK_SHARED_IRQ    (1 << 2)
 187 #define PCS_FEAT_IRQ            (1 << 1)
 188 #define PCS_FEAT_PINCONF        (1 << 0)
 189         struct property *missing_nr_pinctrl_cells;
 190         struct pcs_soc_data socdata;
 191         raw_spinlock_t lock;
 192         struct mutex mutex;
 193         unsigned width;
 194         unsigned fmask;
 195         unsigned fshift;
 196         unsigned foff;
 197         unsigned fmax;
 198         bool bits_per_mux;
 199         unsigned bits_per_pin;
 200         struct pcs_data pins;
 201         struct list_head gpiofuncs;
 202         struct list_head irqs;
 203         struct irq_chip chip;
 204         struct irq_domain *domain;
 205         struct pinctrl_desc desc;
 206         unsigned (*read)(void __iomem *reg);
 207         void (*write)(unsigned val, void __iomem *reg);
 208 };
 209
 210 #define PCS_QUIRK_HAS_SHARED_IRQ        (pcs->flags & PCS_QUIRK_SHARED_IRQ)
 211 #define PCS_HAS_IRQ             (pcs->flags & PCS_FEAT_IRQ)
 212 #define PCS_HAS_PINCONF         (pcs->flags & PCS_FEAT_PINCONF)
 213
 214 static int pcs_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin,
 215                            unsigned long *config);
 216 static int pcs_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin,
 217                            unsigned long *configs, unsigned num_configs);
 218
 219 static enum pin_config_param pcs_bias[] = {
 220         PIN_CONFIG_BIAS_PULL_DOWN,
 221         PIN_CONFIG_BIAS_PULL_UP,
 222 };
 223
 224 /*
 225  * This lock class tells lockdep that irqchip core that this single
 226  * pinctrl can be in a different category than its parents, so it won't
 227  * report false recursion.
 228  */
 229 static struct lock_class_key pcs_lock_class;
 230
 231 /* Class for the IRQ request mutex */
 232 static struct lock_class_key pcs_request_class;
 233
 234 /*
 235  * REVISIT: Reads and writes could eventually use regmap or something
 236  * generic. But at least on omaps, some mux registers are performance
 237  * critical as they may need to be remuxed every time before and after
 238  * idle. Adding tests for register access width for every read and
 239  * write like regmap is doing is not desired, and caching the registers
 240  * does not help in this case.
 241  */
 242
 243 static unsigned __maybe_unused pcs_readb(void __iomem *reg)
 244 {
 245         return readb(reg);
 246 }
 247
 248 static unsigned __maybe_unused pcs_readw(void __iomem *reg)
 249 {
 250         return readw(reg);
 251 }
 252
 253 static unsigned __maybe_unused pcs_readl(void __iomem *reg)
 254 {
 255         return readl(reg);
 256 }
 257
 258 static void __maybe_unused pcs_writeb(unsigned val, void __iomem *reg)
 259 {
 260         writeb(val, reg);
 261 }
 262
 263 static void __maybe_unused pcs_writew(unsigned val, void __iomem *reg)
 264 {
 265         writew(val, reg);
 266 }
 267
 268 static void __maybe_unused pcs_writel(unsigned val, void __iomem *reg)
 269 {
 270         writel(val, reg);
 271 }
 272
 273 static unsigned int pcs_pin_reg_offset_get(struct pcs_device *pcs,
 274                                            unsigned int pin)
 275 {
 276         unsigned int mux_bytes = pcs->width / BITS_PER_BYTE;
 277
 278         if (pcs->bits_per_mux) {
 279                 unsigned int pin_offset_bytes;
 280
 281                 pin_offset_bytes = (pcs->bits_per_pin * pin) / BITS_PER_BYTE;
 282                 return (pin_offset_bytes / mux_bytes) * mux_bytes;
 283         }
 284
 285         return pin * mux_bytes;
 286 }
 287
 288 static unsigned int pcs_pin_shift_reg_get(struct pcs_device *pcs,
 289                                           unsigned int pin)
 290 {
 291         return (pin % (pcs->width / pcs->bits_per_pin)) * pcs->bits_per_pin;
 292 }
 293
 294 static void pcs_pin_dbg_show(struct pinctrl_dev *pctldev,
 295                                         struct seq_file *s,
 296                                         unsigned pin)
 297 {
 298         struct pcs_device *pcs;
 299         unsigned int val;
 300         unsigned long offset;
 301         size_t pa;
 302
 303         pcs = pinctrl_dev_get_drvdata(pctldev);
 304
 305         offset = pcs_pin_reg_offset_get(pcs, pin);
 306         val = pcs->read(pcs->base + offset);
 307
 308         if (pcs->bits_per_mux)
 309                 val &= pcs->fmask << pcs_pin_shift_reg_get(pcs, pin);
 310
 311         pa = pcs->res->start + offset;
 312
 313         seq_printf(s, "%zx %08x %s ", pa, val, DRIVER_NAME);
 314 }
 315
 316 static void pcs_dt_free_map(struct pinctrl_dev *pctldev,
 317                                 struct pinctrl_map *map, unsigned num_maps)
 318 {
 319         struct pcs_device *pcs;
 320
 321         pcs = pinctrl_dev_get_drvdata(pctldev);
 322         devm_kfree(pcs->dev, map);
 323 }
 324
 325 static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
 326                                 struct device_node *np_config,
 327                                 struct pinctrl_map **map, unsigned *num_maps);
 328
 329 static const struct pinctrl_ops pcs_pinctrl_ops = {
 330         .get_groups_count = pinctrl_generic_get_group_count,
 331         .get_group_name = pinctrl_generic_get_group_name,
 332         .get_group_pins = pinctrl_generic_get_group_pins,
 333         .pin_dbg_show = pcs_pin_dbg_show,
 334         .dt_node_to_map = pcs_dt_node_to_map,
 335         .dt_free_map = pcs_dt_free_map,
 336 };
 337
 338 static int pcs_get_function(struct pinctrl_dev *pctldev, unsigned pin,
 339                             struct pcs_function **func)
 340 {
 341         struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
 342         struct pin_desc *pdesc = pin_desc_get(pctldev, pin);
 343         const struct pinctrl_setting_mux *setting;
 344         struct function_desc *function;
 345         unsigned fselector;
 346
 347         /* If pin is not described in DTS & enabled, mux_setting is NULL. */
 348         setting = pdesc->mux_setting;
 349         if (!setting)
 350                 return -ENOTSUPP;
 351         fselector = setting->func;
 352         function = pinmux_generic_get_function(pctldev, fselector);
 353         *func = function->data;
 354         if (!(*func)) {
 355                 dev_err(pcs->dev, "%s could not find function%i\n",
 356                         __func__, fselector);
 357                 return -ENOTSUPP;
 358         }
 359         return 0;
 360 }
 361
 362 static int pcs_set_mux(struct pinctrl_dev *pctldev, unsigned fselector,
 363         unsigned group)
 364 {
 365         struct pcs_device *pcs;
 366         struct function_desc *function;
 367         struct pcs_function *func;
 368         int i;
 369
 370         pcs = pinctrl_dev_get_drvdata(pctldev);
 371         /* If function mask is null, needn't enable it. */
 372         if (!pcs->fmask)
 373                 return 0;
 374         function = pinmux_generic_get_function(pctldev, fselector);
 375         if (!function)
 376                 return -EINVAL;
 377         func = function->data;
 378         if (!func)
 379                 return -EINVAL;
 380
 381         dev_dbg(pcs->dev, "enabling %s function%i\n",
 382                 func->name, fselector);
 383
 384         for (i = 0; i < func->nvals; i++) {
 385                 struct pcs_func_vals *vals;
 386                 unsigned long flags;
 387                 unsigned val, mask;
 388
 389                 vals = &func->vals[i];
 390                 raw_spin_lock_irqsave(&pcs->lock, flags);
 391                 val = pcs->read(vals->reg);
 392
 393                 if (pcs->bits_per_mux)
 394                         mask = vals->mask;
 395                 else
 396                         mask = pcs->fmask;
 397
 398                 val &= ~mask;
 399                 val |= (vals->val & mask);
 400                 pcs->write(val, vals->reg);
 401                 raw_spin_unlock_irqrestore(&pcs->lock, flags);
 402         }
 403
 404         return 0;
 405 }
 406
 407 static int pcs_request_gpio(struct pinctrl_dev *pctldev,
 408                             struct pinctrl_gpio_range *range, unsigned pin)
 409 {
 410         struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
 411         struct pcs_gpiofunc_range *frange = NULL;
 412         struct list_head *pos, *tmp;
 413         unsigned data;
 414
 415         /* If function mask is null, return directly. */
 416         if (!pcs->fmask)
 417                 return -ENOTSUPP;
 418
 419         list_for_each_safe(pos, tmp, &pcs->gpiofuncs) {
 420                 u32 offset;
 421
 422                 frange = list_entry(pos, struct pcs_gpiofunc_range, node);
 423                 if (pin >= frange->offset + frange->npins
 424                         || pin < frange->offset)
 425                         continue;
 426
 427                 offset = pcs_pin_reg_offset_get(pcs, pin);
 428
 429                 if (pcs->bits_per_mux) {
 430                         int pin_shift = pcs_pin_shift_reg_get(pcs, pin);
 431
 432                         data = pcs->read(pcs->base + offset);
 433                         data &= ~(pcs->fmask << pin_shift);
 434                         data |= frange->gpiofunc << pin_shift;
 435                         pcs->write(data, pcs->base + offset);
 436                 } else {
 437                         data = pcs->read(pcs->base + offset);
 438                         data &= ~pcs->fmask;
 439                         data |= frange->gpiofunc;
 440                         pcs->write(data, pcs->base + offset);
 441                 }
 442                 break;
 443         }
 444         return 0;
 445 }
 446
 447 static const struct pinmux_ops pcs_pinmux_ops = {
 448         .get_functions_count = pinmux_generic_get_function_count,
 449         .get_function_name = pinmux_generic_get_function_name,
 450         .get_function_groups = pinmux_generic_get_function_groups,
 451         .set_mux = pcs_set_mux,
 452         .gpio_request_enable = pcs_request_gpio,
 453 };
 454
 455 /* Clear BIAS value */
 456 static void pcs_pinconf_clear_bias(struct pinctrl_dev *pctldev, unsigned pin)
 457 {
 458         unsigned long config;
 459         int i;
 460         for (i = 0; i < ARRAY_SIZE(pcs_bias); i++) {
 461                 config = pinconf_to_config_packed(pcs_bias[i], 0);
 462                 pcs_pinconf_set(pctldev, pin, &config, 1);
 463         }
 464 }
 465
 466 /*
 467  * Check whether PIN_CONFIG_BIAS_DISABLE is valid.
 468  * It's depend on that PULL_DOWN & PULL_UP configs are all invalid.
 469  */
 470 static bool pcs_pinconf_bias_disable(struct pinctrl_dev *pctldev, unsigned pin)
 471 {
 472         unsigned long config;
 473         int i;
 474
 475         for (i = 0; i < ARRAY_SIZE(pcs_bias); i++) {
 476                 config = pinconf_to_config_packed(pcs_bias[i], 0);
 477                 if (!pcs_pinconf_get(pctldev, pin, &config))
 478                         goto out;
 479         }
 480         return true;
 481 out:
 482         return false;
 483 }
 484
 485 static int pcs_pinconf_get(struct pinctrl_dev *pctldev,
 486                                 unsigned pin, unsigned long *config)
 487 {
 488         struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
 489         struct pcs_function *func;
 490         enum pin_config_param param;
 491         unsigned offset = 0, data = 0, i, j, ret;
 492
 493         ret = pcs_get_function(pctldev, pin, &func);
 494         if (ret)
 495                 return ret;
 496
 497         for (i = 0; i < func->nconfs; i++) {
 498                 param = pinconf_to_config_param(*config);
 499                 if (param == PIN_CONFIG_BIAS_DISABLE) {
 500                         if (pcs_pinconf_bias_disable(pctldev, pin)) {
 501                                 *config = 0;
 502                                 return 0;
 503                         } else {
 504                                 return -ENOTSUPP;
 505                         }
 506                 } else if (param != func->conf[i].param) {
 507                         continue;
 508                 }
 509
 510                 offset = pin * (pcs->width / BITS_PER_BYTE);
 511                 data = pcs->read(pcs->base + offset) & func->conf[i].mask;
 512                 switch (func->conf[i].param) {
 513                 /* 4 parameters */
 514                 case PIN_CONFIG_BIAS_PULL_DOWN:
 515                 case PIN_CONFIG_BIAS_PULL_UP:
 516                 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 517                         if ((data != func->conf[i].enable) ||
 518                             (data == func->conf[i].disable))
 519                                 return -ENOTSUPP;
 520                         *config = 0;
 521                         break;
 522                 /* 2 parameters */
 523                 case PIN_CONFIG_INPUT_SCHMITT:
 524                         for (j = 0; j < func->nconfs; j++) {
 525                                 switch (func->conf[j].param) {
 526                                 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 527                                         if (data != func->conf[j].enable)
 528                                                 return -ENOTSUPP;
 529                                         break;
 530                                 default:
 531                                         break;
 532                                 }
 533                         }
 534                         *config = data;
 535                         break;
 536                 case PIN_CONFIG_DRIVE_STRENGTH:
 537                 case PIN_CONFIG_SLEW_RATE:
 538                 case PIN_CONFIG_MODE_LOW_POWER:
 539                 case PIN_CONFIG_INPUT_ENABLE:
 540                 default:
 541                         *config = data;
 542                         break;
 543                 }
 544                 return 0;
 545         }
 546         return -ENOTSUPP;
 547 }
 548
 549 static int pcs_pinconf_set(struct pinctrl_dev *pctldev,
 550                                 unsigned pin, unsigned long *configs,
 551                                 unsigned num_configs)
 552 {
 553         struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
 554         struct pcs_function *func;
 555         unsigned offset = 0, shift = 0, i, data, ret;
 556         u32 arg;
 557         int j;
 558
 559         ret = pcs_get_function(pctldev, pin, &func);
 560         if (ret)
 561                 return ret;
 562
 563         for (j = 0; j < num_configs; j++) {
 564                 for (i = 0; i < func->nconfs; i++) {
 565                         if (pinconf_to_config_param(configs[j])
 566                                 != func->conf[i].param)
 567                                 continue;
 568
 569                         offset = pin * (pcs->width / BITS_PER_BYTE);
 570                         data = pcs->read(pcs->base + offset);
 571                         arg = pinconf_to_config_argument(configs[j]);
 572                         switch (func->conf[i].param) {
 573                         /* 2 parameters */
 574                         case PIN_CONFIG_INPUT_SCHMITT:
 575                         case PIN_CONFIG_DRIVE_STRENGTH:
 576                         case PIN_CONFIG_SLEW_RATE:
 577                         case PIN_CONFIG_MODE_LOW_POWER:
 578                         case PIN_CONFIG_INPUT_ENABLE:
 579                                 shift = ffs(func->conf[i].mask) - 1;
 580                                 data &= ~func->conf[i].mask;
 581                                 data |= (arg << shift) & func->conf[i].mask;
 582                                 break;
 583                         /* 4 parameters */
 584                         case PIN_CONFIG_BIAS_DISABLE:
 585                                 pcs_pinconf_clear_bias(pctldev, pin);
 586                                 break;
 587                         case PIN_CONFIG_BIAS_PULL_DOWN:
 588                         case PIN_CONFIG_BIAS_PULL_UP:
 589                                 if (arg)
 590                                         pcs_pinconf_clear_bias(pctldev, pin);
 591                                 fallthrough;
 592                         case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 593                                 data &= ~func->conf[i].mask;
 594                                 if (arg)
 595                                         data |= func->conf[i].enable;
 596                                 else
 597                                         data |= func->conf[i].disable;
 598                                 break;
 599                         default:
 600                                 return -ENOTSUPP;
 601                         }
 602                         pcs->write(data, pcs->base + offset);
 603
 604                         break;
 605                 }
 606                 if (i >= func->nconfs)
 607                         return -ENOTSUPP;
 608         } /* for each config */
 609
 610         return 0;
 611 }
 612
 613 static int pcs_pinconf_group_get(struct pinctrl_dev *pctldev,
 614                                 unsigned group, unsigned long *config)
 615 {
 616         const unsigned *pins;
 617         unsigned npins, old = 0;
 618         int i, ret;
 619
 620         ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins);
 621         if (ret)
 622                 return ret;
 623         for (i = 0; i < npins; i++) {
 624                 if (pcs_pinconf_get(pctldev, pins[i], config))
 625                         return -ENOTSUPP;
 626                 /* configs do not match between two pins */
 627                 if (i && (old != *config))
 628                         return -ENOTSUPP;
 629                 old = *config;
 630         }
 631         return 0;
 632 }
 633
 634 static int pcs_pinconf_group_set(struct pinctrl_dev *pctldev,
 635                                 unsigned group, unsigned long *configs,
 636                                 unsigned num_configs)
 637 {
 638         const unsigned *pins;
 639         unsigned npins;
 640         int i, ret;
 641
 642         ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins);
 643         if (ret)
 644                 return ret;
 645         for (i = 0; i < npins; i++) {
 646                 if (pcs_pinconf_set(pctldev, pins[i], configs, num_configs))
 647                         return -ENOTSUPP;
 648         }
 649         return 0;
 650 }
 651
 652 static void pcs_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 653                                 struct seq_file *s, unsigned pin)
 654 {
 655 }
 656
 657 static void pcs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 658                                 struct seq_file *s, unsigned selector)
 659 {
 660 }
 661
 662 static void pcs_pinconf_config_dbg_show(struct pinctrl_dev *pctldev,
 663                                         struct seq_file *s,
 664                                         unsigned long config)
 665 {
 666         pinconf_generic_dump_config(pctldev, s, config);
 667 }
 668
 669 static const struct pinconf_ops pcs_pinconf_ops = {
 670         .pin_config_get = pcs_pinconf_get,
 671         .pin_config_set = pcs_pinconf_set,
 672         .pin_config_group_get = pcs_pinconf_group_get,
 673         .pin_config_group_set = pcs_pinconf_group_set,
 674         .pin_config_dbg_show = pcs_pinconf_dbg_show,
 675         .pin_config_group_dbg_show = pcs_pinconf_group_dbg_show,
 676         .pin_config_config_dbg_show = pcs_pinconf_config_dbg_show,
 677         .is_generic = true,
 678 };
 679
 680 /**
 681  * pcs_add_pin() - add a pin to the static per controller pin array
 682  * @pcs: pcs driver instance
 683  * @offset: register offset from base
 684  */
 685 static int pcs_add_pin(struct pcs_device *pcs, unsigned int offset)
 686 {
 687         struct pcs_soc_data *pcs_soc = &pcs->socdata;
 688         struct pinctrl_pin_desc *pin;
 689         int i;
 690
 691         i = pcs->pins.cur;
 692         if (i >= pcs->desc.npins) {
 693                 dev_err(pcs->dev, "too many pins, max %i\n",
 694                         pcs->desc.npins);
 695                 return -ENOMEM;
 696         }
 697
 698         if (pcs_soc->irq_enable_mask) {
 699                 unsigned val;
 700
 701                 val = pcs->read(pcs->base + offset);
 702                 if (val & pcs_soc->irq_enable_mask) {
 703                         dev_dbg(pcs->dev, "irq enabled at boot for pin at %lx (%x), clearing\n",
 704                                 (unsigned long)pcs->res->start + offset, val);
 705                         val &= ~pcs_soc->irq_enable_mask;
 706                         pcs->write(val, pcs->base + offset);
 707                 }
 708         }
 709
 710         pin = &pcs->pins.pa[i];
 711         pin->number = i;
 712         pcs->pins.cur++;
 713
 714         return i;
 715 }
 716
 717 /**
 718  * pcs_allocate_pin_table() - adds all the pins for the pinctrl driver
 719  * @pcs: pcs driver instance
 720  *
 721  * In case of errors, resources are freed in pcs_free_resources.
 722  *
 723  * If your hardware needs holes in the address space, then just set
 724  * up multiple driver instances.
 725  */
 726 static int pcs_allocate_pin_table(struct pcs_device *pcs)
 727 {
 728         int mux_bytes, nr_pins, i;
 729
 730         mux_bytes = pcs->width / BITS_PER_BYTE;
 731
 732         if (pcs->bits_per_mux && pcs->fmask) {
 733                 pcs->bits_per_pin = fls(pcs->fmask);
 734                 nr_pins = (pcs->size * BITS_PER_BYTE) / pcs->bits_per_pin;
 735         } else {
 736                 nr_pins = pcs->size / mux_bytes;
 737         }
 738
 739         dev_dbg(pcs->dev, "allocating %i pins\n", nr_pins);
 740         pcs->pins.pa = devm_kcalloc(pcs->dev,
 741                                 nr_pins, sizeof(*pcs->pins.pa),
 742                                 GFP_KERNEL);
 743         if (!pcs->pins.pa)
 744                 return -ENOMEM;
 745
 746         pcs->desc.pins = pcs->pins.pa;
 747         pcs->desc.npins = nr_pins;
 748
 749         for (i = 0; i < pcs->desc.npins; i++) {
 750                 unsigned offset;
 751                 int res;
 752
 753                 offset = pcs_pin_reg_offset_get(pcs, i);
 754                 res = pcs_add_pin(pcs, offset);
 755                 if (res < 0) {
 756                         dev_err(pcs->dev, "error adding pins: %i\n", res);
 757                         return res;
 758                 }
 759         }
 760
 761         return 0;
 762 }
 763
 764 /**
 765  * pcs_add_function() - adds a new function to the function list
 766  * @pcs: pcs driver instance
 767  * @fcn: new function allocated
 768  * @name: name of the function
 769  * @vals: array of mux register value pairs used by the function
 770  * @nvals: number of mux register value pairs
 771  * @pgnames: array of pingroup names for the function
 772  * @npgnames: number of pingroup names
 773  *
 774  * Caller must take care of locking.
 775  */
 776 static int pcs_add_function(struct pcs_device *pcs,
 777                             struct pcs_function **fcn,
 778                             const char *name,
 779                             struct pcs_func_vals *vals,
 780                             unsigned int nvals,
 781                             const char **pgnames,
 782                             unsigned int npgnames)
 783 {
 784         struct pcs_function *function;
 785         int selector;
 786
 787         function = devm_kzalloc(pcs->dev, sizeof(*function), GFP_KERNEL);
 788         if (!function)
 789                 return -ENOMEM;
 790
 791         function->vals = vals;
 792         function->nvals = nvals;
 793         function->name = name;
 794
 795         selector = pinmux_generic_add_function(pcs->pctl, name,
 796                                                pgnames, npgnames,
 797                                                function);
 798         if (selector < 0) {
 799                 devm_kfree(pcs->dev, function);
 800                 *fcn = NULL;
 801         } else {
 802                 *fcn = function;
 803         }
 804
 805         return selector;
 806 }
 807
 808 /**
 809  * pcs_get_pin_by_offset() - get a pin index based on the register offset
 810  * @pcs: pcs driver instance
 811  * @offset: register offset from the base
 812  *
 813  * Note that this is OK as long as the pins are in a static array.
 814  */
 815 static int pcs_get_pin_by_offset(struct pcs_device *pcs, unsigned offset)
 816 {
 817         unsigned index;
 818
 819         if (offset >= pcs->size) {
 820                 dev_err(pcs->dev, "mux offset out of range: 0x%x (0x%x)\n",
 821                         offset, pcs->size);
 822                 return -EINVAL;
 823         }
 824
 825         if (pcs->bits_per_mux)
 826                 index = (offset * BITS_PER_BYTE) / pcs->bits_per_pin;
 827         else
 828                 index = offset / (pcs->width / BITS_PER_BYTE);
 829
 830         return index;
 831 }
 832
 833 /*
 834  * check whether data matches enable bits or disable bits
 835  * Return value: 1 for matching enable bits, 0 for matching disable bits,
 836  *               and negative value for matching failure.
 837  */
 838 static int pcs_config_match(unsigned data, unsigned enable, unsigned disable)
 839 {
 840         int ret = -EINVAL;
 841
 842         if (data == enable)
 843                 ret = 1;
 844         else if (data == disable)
 845                 ret = 0;
 846         return ret;
 847 }
 848
 849 static void add_config(struct pcs_conf_vals **conf, enum pin_config_param param,
 850                        unsigned value, unsigned enable, unsigned disable,
 851                        unsigned mask)
 852 {
 853         (*conf)->param = param;
 854         (*conf)->val = value;
 855         (*conf)->enable = enable;
 856         (*conf)->disable = disable;
 857         (*conf)->mask = mask;
 858         (*conf)++;
 859 }
 860
 861 static void add_setting(unsigned long **setting, enum pin_config_param param,
 862                         unsigned arg)
 863 {
 864         **setting = pinconf_to_config_packed(param, arg);
 865         (*setting)++;
 866 }
 867
 868 /* add pinconf setting with 2 parameters */
 869 static void pcs_add_conf2(struct pcs_device *pcs, struct device_node *np,
 870                           const char *name, enum pin_config_param param,
 871                           struct pcs_conf_vals **conf, unsigned long **settings)
 872 {
 873         unsigned value[2], shift;
 874         int ret;
 875
 876         ret = of_property_read_u32_array(np, name, value, 2);
 877         if (ret)
 878                 return;
 879         /* set value & mask */
 880         value[0] &= value[1];
 881         shift = ffs(value[1]) - 1;
 882         /* skip enable & disable */
 883         add_config(conf, param, value[0], 0, 0, value[1]);
 884         add_setting(settings, param, value[0] >> shift);
 885 }
 886
 887 /* add pinconf setting with 4 parameters */
 888 static void pcs_add_conf4(struct pcs_device *pcs, struct device_node *np,
 889                           const char *name, enum pin_config_param param,
 890                           struct pcs_conf_vals **conf, unsigned long **settings)
 891 {
 892         unsigned value[4];
 893         int ret;
 894
 895         /* value to set, enable, disable, mask */
 896         ret = of_property_read_u32_array(np, name, value, 4);
 897         if (ret)
 898                 return;
 899         if (!value[3]) {
 900                 dev_err(pcs->dev, "mask field of the property can't be 0\n");
 901                 return;
 902         }
 903         value[0] &= value[3];
 904         value[1] &= value[3];
 905         value[2] &= value[3];
 906         ret = pcs_config_match(value[0], value[1], value[2]);
 907         if (ret < 0)
 908                 dev_dbg(pcs->dev, "failed to match enable or disable bits\n");
 909         add_config(conf, param, value[0], value[1], value[2], value[3]);
 910         add_setting(settings, param, ret);
 911 }
 912
 913 static int pcs_parse_pinconf(struct pcs_device *pcs, struct device_node *np,
 914                              struct pcs_function *func,
 915                              struct pinctrl_map **map)
 916
 917 {
 918         struct pinctrl_map *m = *map;
 919         int i = 0, nconfs = 0;
 920         unsigned long *settings = NULL, *s = NULL;
 921         struct pcs_conf_vals *conf = NULL;
 922         static const struct pcs_conf_type prop2[] = {
 923                 { "pinctrl-single,drive-strength", PIN_CONFIG_DRIVE_STRENGTH, },
 924                 { "pinctrl-single,slew-rate", PIN_CONFIG_SLEW_RATE, },
 925                 { "pinctrl-single,input-enable", PIN_CONFIG_INPUT_ENABLE, },
 926                 { "pinctrl-single,input-schmitt", PIN_CONFIG_INPUT_SCHMITT, },
 927                 { "pinctrl-single,low-power-mode", PIN_CONFIG_MODE_LOW_POWER, },
 928         };
 929         static const struct pcs_conf_type prop4[] = {
 930                 { "pinctrl-single,bias-pullup", PIN_CONFIG_BIAS_PULL_UP, },
 931                 { "pinctrl-single,bias-pulldown", PIN_CONFIG_BIAS_PULL_DOWN, },
 932                 { "pinctrl-single,input-schmitt-enable",
 933                         PIN_CONFIG_INPUT_SCHMITT_ENABLE, },
 934         };
 935
 936         /* If pinconf isn't supported, don't parse properties in below. */
 937         if (!PCS_HAS_PINCONF)
 938                 return -ENOTSUPP;
 939
 940         /* cacluate how much properties are supported in current node */
 941         for (i = 0; i < ARRAY_SIZE(prop2); i++) {
 942                 if (of_property_present(np, prop2[i].name))
 943                         nconfs++;
 944         }
 945         for (i = 0; i < ARRAY_SIZE(prop4); i++) {
 946                 if (of_property_present(np, prop4[i].name))
 947                         nconfs++;
 948         }
 949         if (!nconfs)
 950                 return -ENOTSUPP;
 951
 952         func->conf = devm_kcalloc(pcs->dev,
 953                                   nconfs, sizeof(struct pcs_conf_vals),
 954                                   GFP_KERNEL);
 955         if (!func->conf)
 956                 return -ENOMEM;
 957         func->nconfs = nconfs;
 958         conf = &(func->conf[0]);
 959         m++;
 960         settings = devm_kcalloc(pcs->dev, nconfs, sizeof(unsigned long),
 961                                 GFP_KERNEL);
 962         if (!settings)
 963                 return -ENOMEM;
 964         s = &settings[0];
 965
 966         for (i = 0; i < ARRAY_SIZE(prop2); i++)
 967                 pcs_add_conf2(pcs, np, prop2[i].name, prop2[i].param,
 968                               &conf, &s);
 969         for (i = 0; i < ARRAY_SIZE(prop4); i++)
 970                 pcs_add_conf4(pcs, np, prop4[i].name, prop4[i].param,
 971                               &conf, &s);
 972         m->type = PIN_MAP_TYPE_CONFIGS_GROUP;
 973         m->data.configs.group_or_pin = np->name;
 974         m->data.configs.configs = settings;
 975         m->data.configs.num_configs = nconfs;
 976         return 0;
 977 }
 978
 979 /**
 980  * pcs_parse_one_pinctrl_entry() - parses a device tree mux entry
 981  * @pcs: pinctrl driver instance
 982  * @np: device node of the mux entry
 983  * @map: map entry
 984  * @num_maps: number of map
 985  * @pgnames: pingroup names
 986  *
 987  * Note that this binding currently supports only sets of one register + value.
 988  *
 989  * Also note that this driver tries to avoid understanding pin and function
 990  * names because of the extra bloat they would cause especially in the case of
 991  * a large number of pins. This driver just sets what is specified for the board
 992  * in the .dts file. Further user space debugging tools can be developed to
 993  * decipher the pin and function names using debugfs.
 994  *
 995  * If you are concerned about the boot time, set up the static pins in
 996  * the bootloader, and only set up selected pins as device tree entries.
 997  */
 998 static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
 999                                                 struct device_node *np,
1000                                                 struct pinctrl_map **map,
1001                                                 unsigned *num_maps,
1002                                                 const char **pgnames)
1003 {
1004         const char *name = "pinctrl-single,pins";
1005         struct pcs_func_vals *vals;
1006         int rows, *pins, found = 0, res = -ENOMEM, i, fsel, gsel;
1007         struct pcs_function *function = NULL;
1008
1009         rows = pinctrl_count_index_with_args(np, name);
1010         if (rows <= 0) {
1011                 dev_err(pcs->dev, "Invalid number of rows: %d\n", rows);
1012                 return -EINVAL;
1013         }
1014
1015         vals = devm_kcalloc(pcs->dev, rows, sizeof(*vals), GFP_KERNEL);
1016         if (!vals)
1017                 return -ENOMEM;
1018
1019         pins = devm_kcalloc(pcs->dev, rows, sizeof(*pins), GFP_KERNEL);
1020         if (!pins)
1021                 goto free_vals;
1022
1023         for (i = 0; i < rows; i++) {
1024                 struct of_phandle_args pinctrl_spec;
1025                 unsigned int offset;
1026                 int pin;
1027
1028                 res = pinctrl_parse_index_with_args(np, name, i, &pinctrl_spec);
1029                 if (res)
1030                         return res;
1031
1032                 if (pinctrl_spec.args_count < 2 || pinctrl_spec.args_count > 3) {
1033                         dev_err(pcs->dev, "invalid args_count for spec: %i\n",
1034                                 pinctrl_spec.args_count);
1035                         break;
1036                 }
1037
1038                 offset = pinctrl_spec.args[0];
1039                 vals[found].reg = pcs->base + offset;
1040
1041                 switch (pinctrl_spec.args_count) {
1042                 case 2:
1043                         vals[found].val = pinctrl_spec.args[1];
1044                         break;
1045                 case 3:
1046                         vals[found].val = (pinctrl_spec.args[1] | pinctrl_spec.args[2]);
1047                         break;
1048                 }
1049
1050                 dev_dbg(pcs->dev, "%pOFn index: 0x%x value: 0x%x\n",
1051                         pinctrl_spec.np, offset, vals[found].val);
1052
1053                 pin = pcs_get_pin_by_offset(pcs, offset);
1054                 if (pin < 0) {
1055                         dev_err(pcs->dev,
1056                                 "could not add functions for %pOFn %ux\n",
1057                                 np, offset);
1058                         break;
1059                 }
1060                 pins[found++] = pin;
1061         }
1062
1063         pgnames[0] = np->name;
1064         mutex_lock(&pcs->mutex);
1065         fsel = pcs_add_function(pcs, &function, np->name, vals, found,
1066                                 pgnames, 1);
1067         if (fsel < 0) {
1068                 res = fsel;
1069                 goto free_pins;
1070         }
1071
1072         gsel = pinctrl_generic_add_group(pcs->pctl, np->name, pins, found, pcs);
1073         if (gsel < 0) {
1074                 res = gsel;
1075                 goto free_function;
1076         }
1077
1078         (*map)->type = PIN_MAP_TYPE_MUX_GROUP;
1079         (*map)->data.mux.group = np->name;
1080         (*map)->data.mux.function = np->name;
1081
1082         if (PCS_HAS_PINCONF && function) {
1083                 res = pcs_parse_pinconf(pcs, np, function, map);
1084                 if (res == 0)
1085                         *num_maps = 2;
1086                 else if (res == -ENOTSUPP)
1087                         *num_maps = 1;
1088                 else
1089                         goto free_pingroups;
1090         } else {
1091                 *num_maps = 1;
1092         }
1093         mutex_unlock(&pcs->mutex);
1094
1095         return 0;
1096
1097 free_pingroups:
1098         pinctrl_generic_remove_group(pcs->pctl, gsel);
1099         *num_maps = 1;
1100 free_function:
1101         pinmux_generic_remove_function(pcs->pctl, fsel);
1102 free_pins:
1103         mutex_unlock(&pcs->mutex);
1104         devm_kfree(pcs->dev, pins);
1105
1106 free_vals:
1107         devm_kfree(pcs->dev, vals);
1108
1109         return res;
1110 }
1111
1112 static int pcs_parse_bits_in_pinctrl_entry(struct pcs_device *pcs,
1113                                                 struct device_node *np,
1114                                                 struct pinctrl_map **map,
1115                                                 unsigned *num_maps,
1116                                                 const char **pgnames)
1117 {
1118         const char *name = "pinctrl-single,bits";
1119         struct pcs_func_vals *vals;
1120         int rows, *pins, found = 0, res = -ENOMEM, i, fsel;
1121         int npins_in_row;
1122         struct pcs_function *function = NULL;
1123
1124         rows = pinctrl_count_index_with_args(np, name);
1125         if (rows <= 0) {
1126                 dev_err(pcs->dev, "Invalid number of rows: %d\n", rows);
1127                 return -EINVAL;
1128         }
1129
1130         if (PCS_HAS_PINCONF) {
1131                 dev_err(pcs->dev, "pinconf not supported\n");
1132                 return -ENOTSUPP;
1133         }
1134
1135         npins_in_row = pcs->width / pcs->bits_per_pin;
1136
1137         vals = devm_kzalloc(pcs->dev,
1138                             array3_size(rows, npins_in_row, sizeof(*vals)),
1139                             GFP_KERNEL);
1140         if (!vals)
1141                 return -ENOMEM;
1142
1143         pins = devm_kzalloc(pcs->dev,
1144                             array3_size(rows, npins_in_row, sizeof(*pins)),
1145                             GFP_KERNEL);
1146         if (!pins)
1147                 goto free_vals;
1148
1149         for (i = 0; i < rows; i++) {
1150                 struct of_phandle_args pinctrl_spec;
1151                 unsigned offset, val;
1152                 unsigned mask, bit_pos, val_pos, mask_pos, submask;
1153                 unsigned pin_num_from_lsb;
1154                 int pin;
1155
1156                 res = pinctrl_parse_index_with_args(np, name, i, &pinctrl_spec);
1157                 if (res)
1158                         return res;
1159
1160                 if (pinctrl_spec.args_count < 3) {
1161                         dev_err(pcs->dev, "invalid args_count for spec: %i\n",
1162                                 pinctrl_spec.args_count);
1163                         break;
1164                 }
1165
1166                 /* Index plus two value cells */
1167                 offset = pinctrl_spec.args[0];
1168                 val = pinctrl_spec.args[1];
1169                 mask = pinctrl_spec.args[2];
1170
1171                 dev_dbg(pcs->dev, "%pOFn index: 0x%x value: 0x%x mask: 0x%x\n",
1172                         pinctrl_spec.np, offset, val, mask);
1173
1174                 /* Parse pins in each row from LSB */
1175                 while (mask) {
1176                         bit_pos = __ffs(mask);
1177                         pin_num_from_lsb = bit_pos / pcs->bits_per_pin;
1178                         mask_pos = ((pcs->fmask) << bit_pos);
1179                         val_pos = val & mask_pos;
1180                         submask = mask & mask_pos;
1181
1182                         if ((mask & mask_pos) == 0) {
1183                                 dev_err(pcs->dev,
1184                                         "Invalid mask for %pOFn at 0x%x\n",
1185                                         np, offset);
1186                                 break;
1187                         }
1188
1189                         mask &= ~mask_pos;
1190
1191                         if (submask != mask_pos) {
1192                                 dev_warn(pcs->dev,
1193                                                 "Invalid submask 0x%x for %pOFn at 0x%x\n",
1194                                                 submask, np, offset);
1195                                 continue;
1196                         }
1197
1198                         vals[found].mask = submask;
1199                         vals[found].reg = pcs->base + offset;
1200                         vals[found].val = val_pos;
1201
1202                         pin = pcs_get_pin_by_offset(pcs, offset);
1203                         if (pin < 0) {
1204                                 dev_err(pcs->dev,
1205                                         "could not add functions for %pOFn %ux\n",
1206                                         np, offset);
1207                                 break;
1208                         }
1209                         pins[found++] = pin + pin_num_from_lsb;
1210                 }
1211         }
1212
1213         pgnames[0] = np->name;
1214         mutex_lock(&pcs->mutex);
1215         fsel = pcs_add_function(pcs, &function, np->name, vals, found,
1216                                 pgnames, 1);
1217         if (fsel < 0) {
1218                 res = fsel;
1219                 goto free_pins;
1220         }
1221
1222         res = pinctrl_generic_add_group(pcs->pctl, np->name, pins, found, pcs);
1223         if (res < 0)
1224                 goto free_function;
1225
1226         (*map)->type = PIN_MAP_TYPE_MUX_GROUP;
1227         (*map)->data.mux.group = np->name;
1228         (*map)->data.mux.function = np->name;
1229
1230         *num_maps = 1;
1231         mutex_unlock(&pcs->mutex);
1232
1233         return 0;
1234
1235 free_function:
1236         pinmux_generic_remove_function(pcs->pctl, fsel);
1237 free_pins:
1238         mutex_unlock(&pcs->mutex);
1239         devm_kfree(pcs->dev, pins);
1240
1241 free_vals:
1242         devm_kfree(pcs->dev, vals);
1243
1244         return res;
1245 }
1246 /**
1247  * pcs_dt_node_to_map() - allocates and parses pinctrl maps
1248  * @pctldev: pinctrl instance
1249  * @np_config: device tree pinmux entry
1250  * @map: array of map entries
1251  * @num_maps: number of maps
1252  */
1253 static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
1254                                 struct device_node *np_config,
1255                                 struct pinctrl_map **map, unsigned *num_maps)
1256 {
1257         struct pcs_device *pcs;
1258         const char **pgnames;
1259         int ret;
1260
1261         pcs = pinctrl_dev_get_drvdata(pctldev);
1262
1263         /* create 2 maps. One is for pinmux, and the other is for pinconf. */
1264         *map = devm_kcalloc(pcs->dev, 2, sizeof(**map), GFP_KERNEL);
1265         if (!*map)
1266                 return -ENOMEM;
1267
1268         *num_maps = 0;
1269
1270         pgnames = devm_kzalloc(pcs->dev, sizeof(*pgnames), GFP_KERNEL);
1271         if (!pgnames) {
1272                 ret = -ENOMEM;
1273                 goto free_map;
1274         }
1275
1276         if (pcs->bits_per_mux) {
1277                 ret = pcs_parse_bits_in_pinctrl_entry(pcs, np_config, map,
1278                                 num_maps, pgnames);
1279                 if (ret < 0) {
1280                         dev_err(pcs->dev, "no pins entries for %pOFn\n",
1281                                 np_config);
1282                         goto free_pgnames;
1283                 }
1284         } else {
1285                 ret = pcs_parse_one_pinctrl_entry(pcs, np_config, map,
1286                                 num_maps, pgnames);
1287                 if (ret < 0) {
1288                         dev_err(pcs->dev, "no pins entries for %pOFn\n",
1289                                 np_config);
1290                         goto free_pgnames;
1291                 }
1292         }
1293
1294         return 0;
1295
1296 free_pgnames:
1297         devm_kfree(pcs->dev, pgnames);
1298 free_map:
1299         devm_kfree(pcs->dev, *map);
1300
1301         return ret;
1302 }
1303
1304 /**
1305  * pcs_irq_free() - free interrupt
1306  * @pcs: pcs driver instance
1307  */
1308 static void pcs_irq_free(struct pcs_device *pcs)
1309 {
1310         struct pcs_soc_data *pcs_soc = &pcs->socdata;
1311
1312         if (pcs_soc->irq < 0)
1313                 return;
1314
1315         if (pcs->domain)
1316                 irq_domain_remove(pcs->domain);
1317
1318         if (PCS_QUIRK_HAS_SHARED_IRQ)
1319                 free_irq(pcs_soc->irq, pcs_soc);
1320         else
1321                 irq_set_chained_handler(pcs_soc->irq, NULL);
1322 }
1323
1324 /**
1325  * pcs_free_resources() - free memory used by this driver
1326  * @pcs: pcs driver instance
1327  */
1328 static void pcs_free_resources(struct pcs_device *pcs)
1329 {
1330         pcs_irq_free(pcs);
1331         pinctrl_unregister(pcs->pctl);
1332
1333 #if IS_BUILTIN(CONFIG_PINCTRL_SINGLE)
1334         if (pcs->missing_nr_pinctrl_cells)
1335                 of_remove_property(pcs->np, pcs->missing_nr_pinctrl_cells);
1336 #endif
1337 }
1338
1339 static int pcs_add_gpio_func(struct device_node *node, struct pcs_device *pcs)
1340 {
1341         const char *propname = "pinctrl-single,gpio-range";
1342         const char *cellname = "#pinctrl-single,gpio-range-cells";
1343         struct of_phandle_args gpiospec;
1344         struct pcs_gpiofunc_range *range;
1345         int ret, i;
1346
1347         for (i = 0; ; i++) {
1348                 ret = of_parse_phandle_with_args(node, propname, cellname,
1349                                                  i, &gpiospec);
1350                 /* Do not treat it as error. Only treat it as end condition. */
1351                 if (ret) {
1352                         ret = 0;
1353                         break;
1354                 }
1355                 range = devm_kzalloc(pcs->dev, sizeof(*range), GFP_KERNEL);
1356                 if (!range) {
1357                         ret = -ENOMEM;
1358                         break;
1359                 }
1360                 range->offset = gpiospec.args[0];
1361                 range->npins = gpiospec.args[1];
1362                 range->gpiofunc = gpiospec.args[2];
1363                 mutex_lock(&pcs->mutex);
1364                 list_add_tail(&range->node, &pcs->gpiofuncs);
1365                 mutex_unlock(&pcs->mutex);
1366         }
1367         return ret;
1368 }
1369
1370 /**
1371  * struct pcs_interrupt
1372  * @reg:        virtual address of interrupt register
1373  * @hwirq:      hardware irq number
1374  * @irq:        virtual irq number
1375  * @node:       list node
1376  */
1377 struct pcs_interrupt {
1378         void __iomem *reg;
1379         irq_hw_number_t hwirq;
1380         unsigned int irq;
1381         struct list_head node;
1382 };
1383
1384 /**
1385  * pcs_irq_set() - enables or disables an interrupt
1386  * @pcs_soc: SoC specific settings
1387  * @irq: interrupt
1388  * @enable: enable or disable the interrupt
1389  *
1390  * Note that this currently assumes one interrupt per pinctrl
1391  * register that is typically used for wake-up events.
1392  */
1393 static inline void pcs_irq_set(struct pcs_soc_data *pcs_soc,
1394                                int irq, const bool enable)
1395 {
1396         struct pcs_device *pcs;
1397         struct list_head *pos;
1398         unsigned mask;
1399
1400         pcs = container_of(pcs_soc, struct pcs_device, socdata);
1401         list_for_each(pos, &pcs->irqs) {
1402                 struct pcs_interrupt *pcswi;
1403                 unsigned soc_mask;
1404
1405                 pcswi = list_entry(pos, struct pcs_interrupt, node);
1406                 if (irq != pcswi->irq)
1407                         continue;
1408
1409                 soc_mask = pcs_soc->irq_enable_mask;
1410                 raw_spin_lock(&pcs->lock);
1411                 mask = pcs->read(pcswi->reg);
1412                 if (enable)
1413                         mask |= soc_mask;
1414                 else
1415                         mask &= ~soc_mask;
1416                 pcs->write(mask, pcswi->reg);
1417
1418                 /* flush posted write */
1419                 mask = pcs->read(pcswi->reg);
1420                 raw_spin_unlock(&pcs->lock);
1421         }
1422
1423         if (pcs_soc->rearm)
1424                 pcs_soc->rearm();
1425 }
1426
1427 /**
1428  * pcs_irq_mask() - mask pinctrl interrupt
1429  * @d: interrupt data
1430  */
1431 static void pcs_irq_mask(struct irq_data *d)
1432 {
1433         struct pcs_soc_data *pcs_soc = irq_data_get_irq_chip_data(d);
1434
1435         pcs_irq_set(pcs_soc, d->irq, false);
1436 }
1437
1438 /**
1439  * pcs_irq_unmask() - unmask pinctrl interrupt
1440  * @d: interrupt data
1441  */
1442 static void pcs_irq_unmask(struct irq_data *d)
1443 {
1444         struct pcs_soc_data *pcs_soc = irq_data_get_irq_chip_data(d);
1445
1446         pcs_irq_set(pcs_soc, d->irq, true);
1447 }
1448
1449 /**
1450  * pcs_irq_set_wake() - toggle the suspend and resume wake up
1451  * @d: interrupt data
1452  * @state: wake-up state
1453  *
1454  * Note that this should be called only for suspend and resume.
1455  * For runtime PM, the wake-up events should be enabled by default.
1456  */
1457 static int pcs_irq_set_wake(struct irq_data *d, unsigned int state)
1458 {
1459         if (state)
1460                 pcs_irq_unmask(d);
1461         else
1462                 pcs_irq_mask(d);
1463
1464         return 0;
1465 }
1466
1467 /**
1468  * pcs_irq_handle() - common interrupt handler
1469  * @pcs_soc: SoC specific settings
1470  *
1471  * Note that this currently assumes we have one interrupt bit per
1472  * mux register. This interrupt is typically used for wake-up events.
1473  * For more complex interrupts different handlers can be specified.
1474  */
1475 static int pcs_irq_handle(struct pcs_soc_data *pcs_soc)
1476 {
1477         struct pcs_device *pcs;
1478         struct list_head *pos;
1479         int count = 0;
1480
1481         pcs = container_of(pcs_soc, struct pcs_device, socdata);
1482         list_for_each(pos, &pcs->irqs) {
1483                 struct pcs_interrupt *pcswi;
1484                 unsigned mask;
1485
1486                 pcswi = list_entry(pos, struct pcs_interrupt, node);
1487                 raw_spin_lock(&pcs->lock);
1488                 mask = pcs->read(pcswi->reg);
1489                 raw_spin_unlock(&pcs->lock);
1490                 if (mask & pcs_soc->irq_status_mask) {
1491                         generic_handle_domain_irq(pcs->domain,
1492                                                   pcswi->hwirq);
1493                         count++;
1494                 }
1495         }
1496
1497         return count;
1498 }
1499
1500 /**
1501  * pcs_irq_handler() - handler for the shared interrupt case
1502  * @irq: interrupt
1503  * @d: data
1504  *
1505  * Use this for cases where multiple instances of
1506  * pinctrl-single share a single interrupt like on omaps.
1507  */
1508 static irqreturn_t pcs_irq_handler(int irq, void *d)
1509 {
1510         struct pcs_soc_data *pcs_soc = d;
1511
1512         return pcs_irq_handle(pcs_soc) ? IRQ_HANDLED : IRQ_NONE;
1513 }
1514
1515 /**
1516  * pcs_irq_chain_handler() - handler for the dedicated chained interrupt case
1517  * @desc: interrupt descriptor
1518  *
1519  * Use this if you have a separate interrupt for each
1520  * pinctrl-single instance.
1521  */
1522 static void pcs_irq_chain_handler(struct irq_desc *desc)
1523 {
1524         struct pcs_soc_data *pcs_soc = irq_desc_get_handler_data(desc);
1525         struct irq_chip *chip;
1526
1527         chip = irq_desc_get_chip(desc);
1528         chained_irq_enter(chip, desc);
1529         pcs_irq_handle(pcs_soc);
1530         /* REVISIT: export and add handle_bad_irq(irq, desc)? */
1531         chained_irq_exit(chip, desc);
1532 }
1533
1534 static int pcs_irqdomain_map(struct irq_domain *d, unsigned int irq,
1535                              irq_hw_number_t hwirq)
1536 {
1537         struct pcs_soc_data *pcs_soc = d->host_data;
1538         struct pcs_device *pcs;
1539         struct pcs_interrupt *pcswi;
1540
1541         pcs = container_of(pcs_soc, struct pcs_device, socdata);
1542         pcswi = devm_kzalloc(pcs->dev, sizeof(*pcswi), GFP_KERNEL);
1543         if (!pcswi)
1544                 return -ENOMEM;
1545
1546         pcswi->reg = pcs->base + hwirq;
1547         pcswi->hwirq = hwirq;
1548         pcswi->irq = irq;
1549
1550         mutex_lock(&pcs->mutex);
1551         list_add_tail(&pcswi->node, &pcs->irqs);
1552         mutex_unlock(&pcs->mutex);
1553
1554         irq_set_chip_data(irq, pcs_soc);
1555         irq_set_chip_and_handler(irq, &pcs->chip,
1556                                  handle_level_irq);
1557         irq_set_lockdep_class(irq, &pcs_lock_class, &pcs_request_class);
1558         irq_set_noprobe(irq);
1559
1560         return 0;
1561 }
1562
1563 static const struct irq_domain_ops pcs_irqdomain_ops = {
1564         .map = pcs_irqdomain_map,
1565         .xlate = irq_domain_xlate_onecell,
1566 };
1567
1568 /**
1569  * pcs_irq_init_chained_handler() - set up a chained interrupt handler
1570  * @pcs: pcs driver instance
1571  * @np: device node pointer
1572  */
1573 static int pcs_irq_init_chained_handler(struct pcs_device *pcs,
1574                                         struct device_node *np)
1575 {
1576         struct pcs_soc_data *pcs_soc = &pcs->socdata;
1577         const char *name = "pinctrl";
1578         int num_irqs;
1579
1580         if (!pcs_soc->irq_enable_mask ||
1581             !pcs_soc->irq_status_mask) {
1582                 pcs_soc->irq = -1;
1583                 return -EINVAL;
1584         }
1585
1586         INIT_LIST_HEAD(&pcs->irqs);
1587         pcs->chip.name = name;
1588         pcs->chip.irq_ack = pcs_irq_mask;
1589         pcs->chip.irq_mask = pcs_irq_mask;
1590         pcs->chip.irq_unmask = pcs_irq_unmask;
1591         pcs->chip.irq_set_wake = pcs_irq_set_wake;
1592
1593         if (PCS_QUIRK_HAS_SHARED_IRQ) {
1594                 int res;
1595
1596                 res = request_irq(pcs_soc->irq, pcs_irq_handler,
1597                                   IRQF_SHARED | IRQF_NO_SUSPEND |
1598                                   IRQF_NO_THREAD,
1599                                   name, pcs_soc);
1600                 if (res) {
1601                         pcs_soc->irq = -1;
1602                         return res;
1603                 }
1604         } else {
1605                 irq_set_chained_handler_and_data(pcs_soc->irq,
1606                                                  pcs_irq_chain_handler,
1607                                                  pcs_soc);
1608         }
1609
1610         /*
1611          * We can use the register offset as the hardirq
1612          * number as irq_domain_add_simple maps them lazily.
1613          * This way we can easily support more than one
1614          * interrupt per function if needed.
1615          */
1616         num_irqs = pcs->size;
1617
1618         pcs->domain = irq_domain_add_simple(np, num_irqs, 0,
1619                                             &pcs_irqdomain_ops,
1620                                             pcs_soc);
1621         if (!pcs->domain) {
1622                 irq_set_chained_handler(pcs_soc->irq, NULL);
1623                 return -EINVAL;
1624         }
1625
1626         return 0;
1627 }
1628
1629 #ifdef CONFIG_PM
1630 static int pcs_save_context(struct pcs_device *pcs)
1631 {
1632         int i, mux_bytes;
1633         u64 *regsl;
1634         u32 *regsw;
1635         u16 *regshw;
1636
1637         mux_bytes = pcs->width / BITS_PER_BYTE;
1638
1639         if (!pcs->saved_vals) {
1640                 pcs->saved_vals = devm_kzalloc(pcs->dev, pcs->size, GFP_ATOMIC);
1641                 if (!pcs->saved_vals)
1642                         return -ENOMEM;
1643         }
1644
1645         switch (pcs->width) {
1646         case 64:
1647                 regsl = pcs->saved_vals;
1648                 for (i = 0; i < pcs->size; i += mux_bytes)
1649                         *regsl++ = pcs->read(pcs->base + i);
1650                 break;
1651         case 32:
1652                 regsw = pcs->saved_vals;
1653                 for (i = 0; i < pcs->size; i += mux_bytes)
1654                         *regsw++ = pcs->read(pcs->base + i);
1655                 break;
1656         case 16:
1657                 regshw = pcs->saved_vals;
1658                 for (i = 0; i < pcs->size; i += mux_bytes)
1659                         *regshw++ = pcs->read(pcs->base + i);
1660                 break;
1661         }
1662
1663         return 0;
1664 }
1665
1666 static void pcs_restore_context(struct pcs_device *pcs)
1667 {
1668         int i, mux_bytes;
1669         u64 *regsl;
1670         u32 *regsw;
1671         u16 *regshw;
1672
1673         mux_bytes = pcs->width / BITS_PER_BYTE;
1674
1675         switch (pcs->width) {
1676         case 64:
1677                 regsl = pcs->saved_vals;
1678                 for (i = 0; i < pcs->size; i += mux_bytes)
1679                         pcs->write(*regsl++, pcs->base + i);
1680                 break;
1681         case 32:
1682                 regsw = pcs->saved_vals;
1683                 for (i = 0; i < pcs->size; i += mux_bytes)
1684                         pcs->write(*regsw++, pcs->base + i);
1685                 break;
1686         case 16:
1687                 regshw = pcs->saved_vals;
1688                 for (i = 0; i < pcs->size; i += mux_bytes)
1689                         pcs->write(*regshw++, pcs->base + i);
1690                 break;
1691         }
1692 }
1693
1694 static int pinctrl_single_suspend(struct platform_device *pdev,
1695                                         pm_message_t state)
1696 {
1697         struct pcs_device *pcs;
1698
1699         pcs = platform_get_drvdata(pdev);
1700         if (!pcs)
1701                 return -EINVAL;
1702
1703         if (pcs->flags & PCS_CONTEXT_LOSS_OFF) {
1704                 int ret;
1705
1706                 ret = pcs_save_context(pcs);
1707                 if (ret < 0)
1708                         return ret;
1709         }
1710
1711         return pinctrl_force_sleep(pcs->pctl);
1712 }
1713
1714 static int pinctrl_single_resume(struct platform_device *pdev)
1715 {
1716         struct pcs_device *pcs;
1717
1718         pcs = platform_get_drvdata(pdev);
1719         if (!pcs)
1720                 return -EINVAL;
1721
1722         if (pcs->flags & PCS_CONTEXT_LOSS_OFF)
1723                 pcs_restore_context(pcs);
1724
1725         return pinctrl_force_default(pcs->pctl);
1726 }
1727 #endif
1728
1729 /**
1730  * pcs_quirk_missing_pinctrl_cells - handle legacy binding
1731  * @pcs: pinctrl driver instance
1732  * @np: device tree node
1733  * @cells: number of cells
1734  *
1735  * Handle legacy binding with no #pinctrl-cells. This should be
1736  * always two pinctrl-single,bit-per-mux and one for others.
1737  * At some point we may want to consider removing this.
1738  */
1739 static int pcs_quirk_missing_pinctrl_cells(struct pcs_device *pcs,
1740                                            struct device_node *np,
1741                                            int cells)
1742 {
1743         struct property *p;
1744         const char *name = "#pinctrl-cells";
1745         int error;
1746         u32 val;
1747
1748         error = of_property_read_u32(np, name, &val);
1749         if (!error)
1750                 return 0;
1751
1752         dev_warn(pcs->dev, "please update dts to use %s = <%i>\n",
1753                  name, cells);
1754
1755         p = devm_kzalloc(pcs->dev, sizeof(*p), GFP_KERNEL);
1756         if (!p)
1757                 return -ENOMEM;
1758
1759         p->length = sizeof(__be32);
1760         p->value = devm_kzalloc(pcs->dev, sizeof(__be32), GFP_KERNEL);
1761         if (!p->value)
1762                 return -ENOMEM;
1763         *(__be32 *)p->value = cpu_to_be32(cells);
1764
1765         p->name = devm_kstrdup(pcs->dev, name, GFP_KERNEL);
1766         if (!p->name)
1767                 return -ENOMEM;
1768
1769         pcs->missing_nr_pinctrl_cells = p;
1770
1771 #if IS_BUILTIN(CONFIG_PINCTRL_SINGLE)
1772         error = of_add_property(np, pcs->missing_nr_pinctrl_cells);
1773 #endif
1774
1775         return error;
1776 }
1777
1778 static int pcs_probe(struct platform_device *pdev)
1779 {
1780         struct device_node *np = pdev->dev.of_node;
1781         struct pcs_pdata *pdata;
1782         struct resource *res;
1783         struct pcs_device *pcs;
1784         const struct pcs_soc_data *soc;
1785         int ret;
1786
1787         soc = of_device_get_match_data(&pdev->dev);
1788         if (WARN_ON(!soc))
1789                 return -EINVAL;
1790
1791         pcs = devm_kzalloc(&pdev->dev, sizeof(*pcs), GFP_KERNEL);
1792         if (!pcs)
1793                 return -ENOMEM;
1794
1795         pcs->dev = &pdev->dev;
1796         pcs->np = np;
1797         raw_spin_lock_init(&pcs->lock);
1798         mutex_init(&pcs->mutex);
1799         INIT_LIST_HEAD(&pcs->gpiofuncs);
1800         pcs->flags = soc->flags;
1801         memcpy(&pcs->socdata, soc, sizeof(*soc));
1802
1803         ret = of_property_read_u32(np, "pinctrl-single,register-width",
1804                                    &pcs->width);
1805         if (ret) {
1806                 dev_err(pcs->dev, "register width not specified\n");
1807
1808                 return ret;
1809         }
1810
1811         ret = of_property_read_u32(np, "pinctrl-single,function-mask",
1812                                    &pcs->fmask);
1813         if (!ret) {
1814                 pcs->fshift = __ffs(pcs->fmask);
1815                 pcs->fmax = pcs->fmask >> pcs->fshift;
1816         } else {
1817                 /* If mask property doesn't exist, function mux is invalid. */
1818                 pcs->fmask = 0;
1819                 pcs->fshift = 0;
1820                 pcs->fmax = 0;
1821         }
1822
1823         ret = of_property_read_u32(np, "pinctrl-single,function-off",
1824                                         &pcs->foff);
1825         if (ret)
1826                 pcs->foff = PCS_OFF_DISABLED;
1827
1828         pcs->bits_per_mux = of_property_read_bool(np,
1829                                                   "pinctrl-single,bit-per-mux");
1830         ret = pcs_quirk_missing_pinctrl_cells(pcs, np,
1831                                               pcs->bits_per_mux ? 2 : 1);
1832         if (ret) {
1833                 dev_err(&pdev->dev, "unable to patch #pinctrl-cells\n");
1834
1835                 return ret;
1836         }
1837
1838         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1839         if (!res) {
1840                 dev_err(pcs->dev, "could not get resource\n");
1841                 return -ENODEV;
1842         }
1843
1844         pcs->res = devm_request_mem_region(pcs->dev, res->start,
1845                         resource_size(res), DRIVER_NAME);
1846         if (!pcs->res) {
1847                 dev_err(pcs->dev, "could not get mem_region\n");
1848                 return -EBUSY;
1849         }
1850
1851         pcs->size = resource_size(pcs->res);
1852         pcs->base = devm_ioremap(pcs->dev, pcs->res->start, pcs->size);
1853         if (!pcs->base) {
1854                 dev_err(pcs->dev, "could not ioremap\n");
1855                 return -ENODEV;
1856         }
1857
1858         platform_set_drvdata(pdev, pcs);
1859
1860         switch (pcs->width) {
1861         case 8:
1862                 pcs->read = pcs_readb;
1863                 pcs->write = pcs_writeb;
1864                 break;
1865         case 16:
1866                 pcs->read = pcs_readw;
1867                 pcs->write = pcs_writew;
1868                 break;
1869         case 32:
1870                 pcs->read = pcs_readl;
1871                 pcs->write = pcs_writel;
1872                 break;
1873         default:
1874                 break;
1875         }
1876
1877         pcs->desc.name = DRIVER_NAME;
1878         pcs->desc.pctlops = &pcs_pinctrl_ops;
1879         pcs->desc.pmxops = &pcs_pinmux_ops;
1880         if (PCS_HAS_PINCONF)
1881                 pcs->desc.confops = &pcs_pinconf_ops;
1882         pcs->desc.owner = THIS_MODULE;
1883
1884         ret = pcs_allocate_pin_table(pcs);
1885         if (ret < 0)
1886                 goto free;
1887
1888         ret = pinctrl_register_and_init(&pcs->desc, pcs->dev, pcs, &pcs->pctl);
1889         if (ret) {
1890                 dev_err(pcs->dev, "could not register single pinctrl driver\n");
1891                 goto free;
1892         }
1893
1894         ret = pcs_add_gpio_func(np, pcs);
1895         if (ret < 0)
1896                 goto free;
1897
1898         pcs->socdata.irq = irq_of_parse_and_map(np, 0);
1899         if (pcs->socdata.irq)
1900                 pcs->flags |= PCS_FEAT_IRQ;
1901
1902         /* We still need auxdata for some omaps for PRM interrupts */
1903         pdata = dev_get_platdata(&pdev->dev);
1904         if (pdata) {
1905                 if (pdata->rearm)
1906                         pcs->socdata.rearm = pdata->rearm;
1907                 if (pdata->irq) {
1908                         pcs->socdata.irq = pdata->irq;
1909                         pcs->flags |= PCS_FEAT_IRQ;
1910                 }
1911         }
1912
1913         if (PCS_HAS_IRQ) {
1914                 ret = pcs_irq_init_chained_handler(pcs, np);
1915                 if (ret < 0)
1916                         dev_warn(pcs->dev, "initialized with no interrupts\n");
1917         }
1918
1919         dev_info(pcs->dev, "%i pins, size %u\n", pcs->desc.npins, pcs->size);
1920
1921         return pinctrl_enable(pcs->pctl);
1922
1923 free:
1924         pcs_free_resources(pcs);
1925
1926         return ret;
1927 }
1928
1929 static int pcs_remove(struct platform_device *pdev)
1930 {
1931         struct pcs_device *pcs = platform_get_drvdata(pdev);
1932
1933         if (!pcs)
1934                 return 0;
1935
1936         pcs_free_resources(pcs);
1937
1938         return 0;
1939 }
1940
1941 static const struct pcs_soc_data pinctrl_single_omap_wkup = {
1942         .flags = PCS_QUIRK_SHARED_IRQ,
1943         .irq_enable_mask = (1 << 14),   /* OMAP_WAKEUP_EN */
1944         .irq_status_mask = (1 << 15),   /* OMAP_WAKEUP_EVENT */
1945 };
1946
1947 static const struct pcs_soc_data pinctrl_single_dra7 = {
1948         .irq_enable_mask = (1 << 24),   /* WAKEUPENABLE */
1949         .irq_status_mask = (1 << 25),   /* WAKEUPEVENT */
1950 };
1951
1952 static const struct pcs_soc_data pinctrl_single_am437x = {
1953         .flags = PCS_QUIRK_SHARED_IRQ | PCS_CONTEXT_LOSS_OFF,
1954         .irq_enable_mask = (1 << 29),   /* OMAP_WAKEUP_EN */
1955         .irq_status_mask = (1 << 30),   /* OMAP_WAKEUP_EVENT */
1956 };
1957
1958 static const struct pcs_soc_data pinctrl_single = {
1959 };
1960
1961 static const struct pcs_soc_data pinconf_single = {
1962         .flags = PCS_FEAT_PINCONF,
1963 };
1964
1965 static const struct of_device_id pcs_of_match[] = {
1966         { .compatible = "ti,omap3-padconf", .data = &pinctrl_single_omap_wkup },
1967         { .compatible = "ti,omap4-padconf", .data = &pinctrl_single_omap_wkup },
1968         { .compatible = "ti,omap5-padconf", .data = &pinctrl_single_omap_wkup },
1969         { .compatible = "ti,dra7-padconf", .data = &pinctrl_single_dra7 },
1970         { .compatible = "ti,am437-padconf", .data = &pinctrl_single_am437x },
1971         { .compatible = "pinctrl-single", .data = &pinctrl_single },
1972         { .compatible = "pinconf-single", .data = &pinconf_single },
1973         { },
1974 };
1975 MODULE_DEVICE_TABLE(of, pcs_of_match);
1976
1977 static struct platform_driver pcs_driver = {
1978         .probe          = pcs_probe,
1979         .remove         = pcs_remove,
1980         .driver = {
1981                 .name           = DRIVER_NAME,
1982                 .of_match_table = pcs_of_match,
1983         },
1984 #ifdef CONFIG_PM
1985         .suspend = pinctrl_single_suspend,
1986         .resume = pinctrl_single_resume,
1987 #endif
1988 };
1989
1990 module_platform_driver(pcs_driver);
1991
1992 MODULE_AUTHOR("Tony Lindgren <[email protected]>");
1993 MODULE_DESCRIPTION("One-register-per-pin type device tree based pinctrl driver");
1994 MODULE_LICENSE("GPL v2");