drivers/pinctrl/pinctrl-at91-pio4.c

   1 /*
   2  * Driver for the Atmel PIO4 controller
   3  *
   4  * Copyright (C) 2015 Atmel,
   5  *               2015 Ludovic Desroches <ludovic.desroches@atmel.com>
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/gpio/driver.h>
  19 /* FIXME: needed for gpio_to_irq(), get rid of this */
  20 #include <linux/gpio.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/io.h>
  23 #include <linux/init.h>
  24 #include <linux/of.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/pinctrl/pinconf.h>
  27 #include <linux/pinctrl/pinconf-generic.h>
  28 #include <linux/pinctrl/pinctrl.h>
  29 #include <linux/pinctrl/pinmux.h>
  30 #include <linux/slab.h>
  31 #include "core.h"
  32 #include "pinconf.h"
  33 #include "pinctrl-utils.h"
  34
  35 /*
  36  * Warning:
  37  * In order to not introduce confusion between Atmel PIO groups and pinctrl
  38  * framework groups, Atmel PIO groups will be called banks, line is kept to
  39  * designed the pin id into this bank.
  40  */
  41
  42 #define ATMEL_PIO_MSKR          0x0000
  43 #define ATMEL_PIO_CFGR          0x0004
  44 #define         ATMEL_PIO_CFGR_FUNC_MASK        GENMASK(2, 0)
  45 #define         ATMEL_PIO_DIR_MASK              BIT(8)
  46 #define         ATMEL_PIO_PUEN_MASK             BIT(9)
  47 #define         ATMEL_PIO_PDEN_MASK             BIT(10)
  48 #define         ATMEL_PIO_IFEN_MASK             BIT(12)
  49 #define         ATMEL_PIO_IFSCEN_MASK           BIT(13)
  50 #define         ATMEL_PIO_OPD_MASK              BIT(14)
  51 #define         ATMEL_PIO_SCHMITT_MASK          BIT(15)
  52 #define         ATMEL_PIO_CFGR_EVTSEL_MASK      GENMASK(26, 24)
  53 #define         ATMEL_PIO_CFGR_EVTSEL_FALLING   (0 << 24)
  54 #define         ATMEL_PIO_CFGR_EVTSEL_RISING    (1 << 24)
  55 #define         ATMEL_PIO_CFGR_EVTSEL_BOTH      (2 << 24)
  56 #define         ATMEL_PIO_CFGR_EVTSEL_LOW       (3 << 24)
  57 #define         ATMEL_PIO_CFGR_EVTSEL_HIGH      (4 << 24)
  58 #define ATMEL_PIO_PDSR          0x0008
  59 #define ATMEL_PIO_LOCKSR        0x000C
  60 #define ATMEL_PIO_SODR          0x0010
  61 #define ATMEL_PIO_CODR          0x0014
  62 #define ATMEL_PIO_ODSR          0x0018
  63 #define ATMEL_PIO_IER           0x0020
  64 #define ATMEL_PIO_IDR           0x0024
  65 #define ATMEL_PIO_IMR           0x0028
  66 #define ATMEL_PIO_ISR           0x002C
  67 #define ATMEL_PIO_IOFR          0x003C
  68
  69 #define ATMEL_PIO_NPINS_PER_BANK        32
  70 #define ATMEL_PIO_BANK(pin_id)          (pin_id / ATMEL_PIO_NPINS_PER_BANK)
  71 #define ATMEL_PIO_LINE(pin_id)          (pin_id % ATMEL_PIO_NPINS_PER_BANK)
  72 #define ATMEL_PIO_BANK_OFFSET           0x40
  73
  74 #define ATMEL_GET_PIN_NO(pinfunc)       ((pinfunc) & 0xff)
  75 #define ATMEL_GET_PIN_FUNC(pinfunc)     ((pinfunc >> 16) & 0xf)
  76 #define ATMEL_GET_PIN_IOSET(pinfunc)    ((pinfunc >> 20) & 0xf)
  77
  78 struct atmel_pioctrl_data {
  79         unsigned nbanks;
  80 };
  81
  82 struct atmel_group {
  83         const char *name;
  84         u32 pin;
  85 };
  86
  87 struct atmel_pin {
  88         unsigned pin_id;
  89         unsigned mux;
  90         unsigned ioset;
  91         unsigned bank;
  92         unsigned line;
  93         const char *device;
  94 };
  95
  96 /**
  97  * struct atmel_pioctrl - Atmel PIO controller (pinmux + gpio)
  98  * @reg_base: base address of the controller.
  99  * @clk: clock of the controller.
 100  * @nbanks: number of PIO groups, it can vary depending on the SoC.
 101  * @pinctrl_dev: pinctrl device registered.
 102  * @groups: groups table to provide group name and pin in the group to pinctrl.
 103  * @group_names: group names table to provide all the group/pin names to
 104  *     pinctrl or gpio.
 105  * @pins: pins table used for both pinctrl and gpio. pin_id, bank and line
 106  *     fields are set at probe time. Other ones are set when parsing dt
 107  *     pinctrl.
 108  * @npins: number of pins.
 109  * @gpio_chip: gpio chip registered.
 110  * @irq_domain: irq domain for the gpio controller.
 111  * @irqs: table containing the hw irq number of the bank. The index of the
 112  *     table is the bank id.
 113  * @dev: device entry for the Atmel PIO controller.
 114  * @node: node of the Atmel PIO controller.
 115  */
 116 struct atmel_pioctrl {
 117         void __iomem            *reg_base;
 118         struct clk              *clk;
 119         unsigned                nbanks;
 120         struct pinctrl_dev      *pinctrl_dev;
 121         struct atmel_group      *groups;
 122         const char * const      *group_names;
 123         struct atmel_pin        **pins;
 124         unsigned                npins;
 125         struct gpio_chip        *gpio_chip;
 126         struct irq_domain       *irq_domain;
 127         int                     *irqs;
 128         unsigned                *pm_wakeup_sources;
 129         struct {
 130                 u32             imr;
 131                 u32             odsr;
 132                 u32             cfgr[ATMEL_PIO_NPINS_PER_BANK];
 133         } *pm_suspend_backup;
 134         struct device           *dev;
 135         struct device_node      *node;
 136 };
 137
 138 static const char * const atmel_functions[] = {
 139         "GPIO", "A", "B", "C", "D", "E", "F", "G"
 140 };
 141
 142 /* --- GPIO --- */
 143 static unsigned int atmel_gpio_read(struct atmel_pioctrl *atmel_pioctrl,
 144                                     unsigned int bank, unsigned int reg)
 145 {
 146         return readl_relaxed(atmel_pioctrl->reg_base
 147                              + ATMEL_PIO_BANK_OFFSET * bank + reg);
 148 }
 149
 150 static void atmel_gpio_write(struct atmel_pioctrl *atmel_pioctrl,
 151                              unsigned int bank, unsigned int reg,
 152                              unsigned int val)
 153 {
 154         writel_relaxed(val, atmel_pioctrl->reg_base
 155                        + ATMEL_PIO_BANK_OFFSET * bank + reg);
 156 }
 157
 158 static void atmel_gpio_irq_ack(struct irq_data *d)
 159 {
 160         /*
 161          * Nothing to do, interrupt is cleared when reading the status
 162          * register.
 163          */
 164 }
 165
 166 static int atmel_gpio_irq_set_type(struct irq_data *d, unsigned type)
 167 {
 168         struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
 169         struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
 170         unsigned reg;
 171
 172         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
 173                          BIT(pin->line));
 174         reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
 175         reg &= (~ATMEL_PIO_CFGR_EVTSEL_MASK);
 176
 177         switch (type) {
 178         case IRQ_TYPE_EDGE_RISING:
 179                 irq_set_handler_locked(d, handle_edge_irq);
 180                 reg |= ATMEL_PIO_CFGR_EVTSEL_RISING;
 181                 break;
 182         case IRQ_TYPE_EDGE_FALLING:
 183                 irq_set_handler_locked(d, handle_edge_irq);
 184                 reg |= ATMEL_PIO_CFGR_EVTSEL_FALLING;
 185                 break;
 186         case IRQ_TYPE_EDGE_BOTH:
 187                 irq_set_handler_locked(d, handle_edge_irq);
 188                 reg |= ATMEL_PIO_CFGR_EVTSEL_BOTH;
 189                 break;
 190         case IRQ_TYPE_LEVEL_LOW:
 191                 irq_set_handler_locked(d, handle_level_irq);
 192                 reg |= ATMEL_PIO_CFGR_EVTSEL_LOW;
 193                 break;
 194         case IRQ_TYPE_LEVEL_HIGH:
 195                 irq_set_handler_locked(d, handle_level_irq);
 196                 reg |= ATMEL_PIO_CFGR_EVTSEL_HIGH;
 197                 break;
 198         case IRQ_TYPE_NONE:
 199         default:
 200                 return -EINVAL;
 201         }
 202
 203         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
 204
 205         return 0;
 206 }
 207
 208 static void atmel_gpio_irq_mask(struct irq_data *d)
 209 {
 210         struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
 211         struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
 212
 213         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IDR,
 214                          BIT(pin->line));
 215 }
 216
 217 static void atmel_gpio_irq_unmask(struct irq_data *d)
 218 {
 219         struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
 220         struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
 221
 222         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IER,
 223                          BIT(pin->line));
 224 }
 225
 226 #ifdef CONFIG_PM_SLEEP
 227
 228 static int atmel_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
 229 {
 230         struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
 231         int bank = ATMEL_PIO_BANK(d->hwirq);
 232         int line = ATMEL_PIO_LINE(d->hwirq);
 233
 234         /* The gpio controller has one interrupt line per bank. */
 235         irq_set_irq_wake(atmel_pioctrl->irqs[bank], on);
 236
 237         if (on)
 238                 atmel_pioctrl->pm_wakeup_sources[bank] |= BIT(line);
 239         else
 240                 atmel_pioctrl->pm_wakeup_sources[bank] &= ~(BIT(line));
 241
 242         return 0;
 243 }
 244 #else
 245 #define atmel_gpio_irq_set_wake NULL
 246 #endif /* CONFIG_PM_SLEEP */
 247
 248 static struct irq_chip atmel_gpio_irq_chip = {
 249         .name           = "GPIO",
 250         .irq_ack        = atmel_gpio_irq_ack,
 251         .irq_mask       = atmel_gpio_irq_mask,
 252         .irq_unmask     = atmel_gpio_irq_unmask,
 253         .irq_set_type   = atmel_gpio_irq_set_type,
 254         .irq_set_wake   = atmel_gpio_irq_set_wake,
 255 };
 256
 257 static void atmel_gpio_irq_handler(struct irq_desc *desc)
 258 {
 259         unsigned int irq = irq_desc_get_irq(desc);
 260         struct atmel_pioctrl *atmel_pioctrl = irq_desc_get_handler_data(desc);
 261         struct irq_chip *chip = irq_desc_get_chip(desc);
 262         unsigned long isr;
 263         int n, bank = -1;
 264
 265         /* Find from which bank is the irq received. */
 266         for (n = 0; n < atmel_pioctrl->nbanks; n++) {
 267                 if (atmel_pioctrl->irqs[n] == irq) {
 268                         bank = n;
 269                         break;
 270                 }
 271         }
 272
 273         if (bank < 0) {
 274                 dev_err(atmel_pioctrl->dev,
 275                         "no bank associated to irq %u\n", irq);
 276                 return;
 277         }
 278
 279         chained_irq_enter(chip, desc);
 280
 281         for (;;) {
 282                 isr = (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
 283                                                      ATMEL_PIO_ISR);
 284                 isr &= (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
 285                                                       ATMEL_PIO_IMR);
 286                 if (!isr)
 287                         break;
 288
 289                 for_each_set_bit(n, &isr, BITS_PER_LONG)
 290                         generic_handle_irq(gpio_to_irq(bank *
 291                                         ATMEL_PIO_NPINS_PER_BANK + n));
 292         }
 293
 294         chained_irq_exit(chip, desc);
 295 }
 296
 297 static int atmel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 298 {
 299         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 300         struct atmel_pin *pin = atmel_pioctrl->pins[offset];
 301         unsigned reg;
 302
 303         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
 304                          BIT(pin->line));
 305         reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
 306         reg &= ~ATMEL_PIO_DIR_MASK;
 307         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
 308
 309         return 0;
 310 }
 311
 312 static int atmel_gpio_get(struct gpio_chip *chip, unsigned offset)
 313 {
 314         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 315         struct atmel_pin *pin = atmel_pioctrl->pins[offset];
 316         unsigned reg;
 317
 318         reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR);
 319
 320         return !!(reg & BIT(pin->line));
 321 }
 322
 323 static int atmel_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
 324                                        int value)
 325 {
 326         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 327         struct atmel_pin *pin = atmel_pioctrl->pins[offset];
 328         unsigned reg;
 329
 330         atmel_gpio_write(atmel_pioctrl, pin->bank,
 331                          value ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
 332                          BIT(pin->line));
 333
 334         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
 335                          BIT(pin->line));
 336         reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
 337         reg |= ATMEL_PIO_DIR_MASK;
 338         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
 339
 340         return 0;
 341 }
 342
 343 static void atmel_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
 344 {
 345         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 346         struct atmel_pin *pin = atmel_pioctrl->pins[offset];
 347
 348         atmel_gpio_write(atmel_pioctrl, pin->bank,
 349                          val ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
 350                          BIT(pin->line));
 351 }
 352
 353 static int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 354 {
 355         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 356
 357         return irq_find_mapping(atmel_pioctrl->irq_domain, offset);
 358 }
 359
 360 static struct gpio_chip atmel_gpio_chip = {
 361         .direction_input        = atmel_gpio_direction_input,
 362         .get                    = atmel_gpio_get,
 363         .direction_output       = atmel_gpio_direction_output,
 364         .set                    = atmel_gpio_set,
 365         .to_irq                 = atmel_gpio_to_irq,
 366         .base                   = 0,
 367 };
 368
 369 /* --- PINCTRL --- */
 370 static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev,
 371                                           unsigned pin_id)
 372 {
 373         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 374         unsigned bank = atmel_pioctrl->pins[pin_id]->bank;
 375         unsigned line = atmel_pioctrl->pins[pin_id]->line;
 376         void __iomem *addr = atmel_pioctrl->reg_base
 377                              + bank * ATMEL_PIO_BANK_OFFSET;
 378
 379         writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
 380         /* Have to set MSKR first, to access the right pin CFGR. */
 381         wmb();
 382
 383         return readl_relaxed(addr + ATMEL_PIO_CFGR);
 384 }
 385
 386 static void atmel_pin_config_write(struct pinctrl_dev *pctldev,
 387                                    unsigned pin_id, u32 conf)
 388 {
 389         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 390         unsigned bank = atmel_pioctrl->pins[pin_id]->bank;
 391         unsigned line = atmel_pioctrl->pins[pin_id]->line;
 392         void __iomem *addr = atmel_pioctrl->reg_base
 393                              + bank * ATMEL_PIO_BANK_OFFSET;
 394
 395         writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
 396         /* Have to set MSKR first, to access the right pin CFGR. */
 397         wmb();
 398         writel_relaxed(conf, addr + ATMEL_PIO_CFGR);
 399 }
 400
 401 static int atmel_pctl_get_groups_count(struct pinctrl_dev *pctldev)
 402 {
 403         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 404
 405         return atmel_pioctrl->npins;
 406 }
 407
 408 static const char *atmel_pctl_get_group_name(struct pinctrl_dev *pctldev,
 409                                              unsigned selector)
 410 {
 411         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 412
 413         return atmel_pioctrl->groups[selector].name;
 414 }
 415
 416 static int atmel_pctl_get_group_pins(struct pinctrl_dev *pctldev,
 417                                      unsigned selector, const unsigned **pins,
 418                                      unsigned *num_pins)
 419 {
 420         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 421
 422         *pins = (unsigned *)&atmel_pioctrl->groups[selector].pin;
 423         *num_pins = 1;
 424
 425         return 0;
 426 }
 427
 428 static struct atmel_group *
 429 atmel_pctl_find_group_by_pin(struct pinctrl_dev *pctldev, unsigned pin)
 430 {
 431         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 432         int i;
 433
 434         for (i = 0; i < atmel_pioctrl->npins; i++) {
 435                 struct atmel_group *grp = atmel_pioctrl->groups + i;
 436
 437                 if (grp->pin == pin)
 438                         return grp;
 439         }
 440
 441         return NULL;
 442 }
 443
 444 static int atmel_pctl_xlate_pinfunc(struct pinctrl_dev *pctldev,
 445                                     struct device_node *np,
 446                                     u32 pinfunc, const char **grp_name,
 447                                     const char **func_name)
 448 {
 449         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 450         unsigned pin_id, func_id;
 451         struct atmel_group *grp;
 452
 453         pin_id = ATMEL_GET_PIN_NO(pinfunc);
 454         func_id = ATMEL_GET_PIN_FUNC(pinfunc);
 455
 456         if (func_id >= ARRAY_SIZE(atmel_functions))
 457                 return -EINVAL;
 458
 459         *func_name = atmel_functions[func_id];
 460
 461         grp = atmel_pctl_find_group_by_pin(pctldev, pin_id);
 462         if (!grp)
 463                 return -EINVAL;
 464         *grp_name = grp->name;
 465
 466         atmel_pioctrl->pins[pin_id]->mux = func_id;
 467         atmel_pioctrl->pins[pin_id]->ioset = ATMEL_GET_PIN_IOSET(pinfunc);
 468         /* Want the device name not the group one. */
 469         if (np->parent == atmel_pioctrl->node)
 470                 atmel_pioctrl->pins[pin_id]->device = np->name;
 471         else
 472                 atmel_pioctrl->pins[pin_id]->device = np->parent->name;
 473
 474         return 0;
 475 }
 476
 477 static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 478                                         struct device_node *np,
 479                                         struct pinctrl_map **map,
 480                                         unsigned *reserved_maps,
 481                                         unsigned *num_maps)
 482 {
 483         unsigned num_pins, num_configs, reserve;
 484         unsigned long *configs;
 485         struct property *pins;
 486         u32 pinfunc;
 487         int ret, i;
 488
 489         pins = of_find_property(np, "pinmux", NULL);
 490         if (!pins)
 491                 return -EINVAL;
 492
 493         ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
 494                                               &num_configs);
 495         if (ret < 0) {
 496                 dev_err(pctldev->dev, "%pOF: could not parse node property\n",
 497                         np);
 498                 return ret;
 499         }
 500
 501         num_pins = pins->length / sizeof(u32);
 502         if (!num_pins) {
 503                 dev_err(pctldev->dev, "no pins found in node %pOF\n", np);
 504                 ret = -EINVAL;
 505                 goto exit;
 506         }
 507
 508         /*
 509          * Reserve maps, at least there is a mux map and an optional conf
 510          * map for each pin.
 511          */
 512         reserve = 1;
 513         if (num_configs)
 514                 reserve++;
 515         reserve *= num_pins;
 516         ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
 517                                         reserve);
 518         if (ret < 0)
 519                 goto exit;
 520
 521         for (i = 0; i < num_pins; i++) {
 522                 const char *group, *func;
 523
 524                 ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc);
 525                 if (ret)
 526                         goto exit;
 527
 528                 ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group,
 529                                                &func);
 530                 if (ret)
 531                         goto exit;
 532
 533                 pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
 534                                           group, func);
 535
 536                 if (num_configs) {
 537                         ret = pinctrl_utils_add_map_configs(pctldev, map,
 538                                         reserved_maps, num_maps, group,
 539                                         configs, num_configs,
 540                                         PIN_MAP_TYPE_CONFIGS_GROUP);
 541                         if (ret < 0)
 542                                 goto exit;
 543                 }
 544         }
 545
 546 exit:
 547         kfree(configs);
 548         return ret;
 549 }
 550
 551 static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
 552                                      struct device_node *np_config,
 553                                      struct pinctrl_map **map,
 554                                      unsigned *num_maps)
 555 {
 556         struct device_node *np;
 557         unsigned reserved_maps;
 558         int ret;
 559
 560         *map = NULL;
 561         *num_maps = 0;
 562         reserved_maps = 0;
 563
 564         /*
 565          * If all the pins of a device have the same configuration (or no one),
 566          * it is useless to add a subnode, so directly parse node referenced by
 567          * phandle.
 568          */
 569         ret = atmel_pctl_dt_subnode_to_map(pctldev, np_config, map,
 570                                            &reserved_maps, num_maps);
 571         if (ret) {
 572                 for_each_child_of_node(np_config, np) {
 573                         ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map,
 574                                                     &reserved_maps, num_maps);
 575                         if (ret < 0) {
 576                                 of_node_put(np);
 577                                 break;
 578                         }
 579                 }
 580         }
 581
 582         if (ret < 0) {
 583                 pinctrl_utils_free_map(pctldev, *map, *num_maps);
 584                 dev_err(pctldev->dev, "can't create maps for node %pOF\n",
 585                         np_config);
 586         }
 587
 588         return ret;
 589 }
 590
 591 static const struct pinctrl_ops atmel_pctlops = {
 592         .get_groups_count       = atmel_pctl_get_groups_count,
 593         .get_group_name         = atmel_pctl_get_group_name,
 594         .get_group_pins         = atmel_pctl_get_group_pins,
 595         .dt_node_to_map         = atmel_pctl_dt_node_to_map,
 596         .dt_free_map            = pinctrl_utils_free_map,
 597 };
 598
 599 static int atmel_pmx_get_functions_count(struct pinctrl_dev *pctldev)
 600 {
 601         return ARRAY_SIZE(atmel_functions);
 602 }
 603
 604 static const char *atmel_pmx_get_function_name(struct pinctrl_dev *pctldev,
 605                                                unsigned selector)
 606 {
 607         return atmel_functions[selector];
 608 }
 609
 610 static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev,
 611                                          unsigned selector,
 612                                          const char * const **groups,
 613                                          unsigned * const num_groups)
 614 {
 615         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 616
 617         *groups = atmel_pioctrl->group_names;
 618         *num_groups = atmel_pioctrl->npins;
 619
 620         return 0;
 621 }
 622
 623 static int atmel_pmx_set_mux(struct pinctrl_dev *pctldev,
 624                              unsigned function,
 625                              unsigned group)
 626 {
 627         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 628         unsigned pin;
 629         u32 conf;
 630
 631         dev_dbg(pctldev->dev, "enable function %s group %s\n",
 632                 atmel_functions[function], atmel_pioctrl->groups[group].name);
 633
 634         pin = atmel_pioctrl->groups[group].pin;
 635         conf = atmel_pin_config_read(pctldev, pin);
 636         conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
 637         conf |= (function & ATMEL_PIO_CFGR_FUNC_MASK);
 638         dev_dbg(pctldev->dev, "pin: %u, conf: 0x%08x\n", pin, conf);
 639         atmel_pin_config_write(pctldev, pin, conf);
 640
 641         return 0;
 642 }
 643
 644 static const struct pinmux_ops atmel_pmxops = {
 645         .get_functions_count    = atmel_pmx_get_functions_count,
 646         .get_function_name      = atmel_pmx_get_function_name,
 647         .get_function_groups    = atmel_pmx_get_function_groups,
 648         .set_mux                = atmel_pmx_set_mux,
 649 };
 650
 651 static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev,
 652                                            unsigned group,
 653                                            unsigned long *config)
 654 {
 655         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 656         unsigned param = pinconf_to_config_param(*config), arg = 0;
 657         struct atmel_group *grp = atmel_pioctrl->groups + group;
 658         unsigned pin_id = grp->pin;
 659         u32 res;
 660
 661         res = atmel_pin_config_read(pctldev, pin_id);
 662
 663         switch (param) {
 664         case PIN_CONFIG_BIAS_PULL_UP:
 665                 if (!(res & ATMEL_PIO_PUEN_MASK))
 666                         return -EINVAL;
 667                 arg = 1;
 668                 break;
 669         case PIN_CONFIG_BIAS_PULL_DOWN:
 670                 if ((res & ATMEL_PIO_PUEN_MASK) ||
 671                     (!(res & ATMEL_PIO_PDEN_MASK)))
 672                         return -EINVAL;
 673                 arg = 1;
 674                 break;
 675         case PIN_CONFIG_BIAS_DISABLE:
 676                 if ((res & ATMEL_PIO_PUEN_MASK) ||
 677                     ((res & ATMEL_PIO_PDEN_MASK)))
 678                         return -EINVAL;
 679                 arg = 1;
 680                 break;
 681         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 682                 if (!(res & ATMEL_PIO_OPD_MASK))
 683                         return -EINVAL;
 684                 arg = 1;
 685                 break;
 686         case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 687                 if (!(res & ATMEL_PIO_SCHMITT_MASK))
 688                         return -EINVAL;
 689                 arg = 1;
 690                 break;
 691         default:
 692                 return -ENOTSUPP;
 693         }
 694
 695         *config = pinconf_to_config_packed(param, arg);
 696         return 0;
 697 }
 698
 699 static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
 700                                            unsigned group,
 701                                            unsigned long *configs,
 702                                            unsigned num_configs)
 703 {
 704         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 705         struct atmel_group *grp = atmel_pioctrl->groups + group;
 706         unsigned bank, pin, pin_id = grp->pin;
 707         u32 mask, conf = 0;
 708         int i;
 709
 710         conf = atmel_pin_config_read(pctldev, pin_id);
 711
 712         for (i = 0; i < num_configs; i++) {
 713                 unsigned param = pinconf_to_config_param(configs[i]);
 714                 unsigned arg = pinconf_to_config_argument(configs[i]);
 715
 716                 dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
 717                         __func__, pin_id, configs[i]);
 718
 719                 switch (param) {
 720                 case PIN_CONFIG_BIAS_DISABLE:
 721                         conf &= (~ATMEL_PIO_PUEN_MASK);
 722                         conf &= (~ATMEL_PIO_PDEN_MASK);
 723                         break;
 724                 case PIN_CONFIG_BIAS_PULL_UP:
 725                         conf |= ATMEL_PIO_PUEN_MASK;
 726                         conf &= (~ATMEL_PIO_PDEN_MASK);
 727                         break;
 728                 case PIN_CONFIG_BIAS_PULL_DOWN:
 729                         conf |= ATMEL_PIO_PDEN_MASK;
 730                         conf &= (~ATMEL_PIO_PUEN_MASK);
 731                         break;
 732                 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 733                         if (arg == 0)
 734                                 conf &= (~ATMEL_PIO_OPD_MASK);
 735                         else
 736                                 conf |= ATMEL_PIO_OPD_MASK;
 737                         break;
 738                 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 739                         if (arg == 0)
 740                                 conf |= ATMEL_PIO_SCHMITT_MASK;
 741                         else
 742                                 conf &= (~ATMEL_PIO_SCHMITT_MASK);
 743                         break;
 744                 case PIN_CONFIG_INPUT_DEBOUNCE:
 745                         if (arg == 0) {
 746                                 conf &= (~ATMEL_PIO_IFEN_MASK);
 747                                 conf &= (~ATMEL_PIO_IFSCEN_MASK);
 748                         } else {
 749                                 /*
 750                                  * We don't care about the debounce value for several reasons:
 751                                  * - can't have different debounce periods inside a same group,
 752                                  * - the register to configure this period is a secure register.
 753                                  * The debouncing filter can filter a pulse with a duration of less
 754                                  * than 1/2 slow clock period.
 755                                  */
 756                                 conf |= ATMEL_PIO_IFEN_MASK;
 757                                 conf |= ATMEL_PIO_IFSCEN_MASK;
 758                         }
 759                         break;
 760                 case PIN_CONFIG_OUTPUT:
 761                         conf |= ATMEL_PIO_DIR_MASK;
 762                         bank = ATMEL_PIO_BANK(pin_id);
 763                         pin = ATMEL_PIO_LINE(pin_id);
 764                         mask = 1 << pin;
 765
 766                         if (arg == 0) {
 767                                 writel_relaxed(mask, atmel_pioctrl->reg_base +
 768                                         bank * ATMEL_PIO_BANK_OFFSET +
 769                                         ATMEL_PIO_CODR);
 770                         } else {
 771                                 writel_relaxed(mask, atmel_pioctrl->reg_base +
 772                                         bank * ATMEL_PIO_BANK_OFFSET +
 773                                         ATMEL_PIO_SODR);
 774                         }
 775                         break;
 776                 default:
 777                         dev_warn(pctldev->dev,
 778                                  "unsupported configuration parameter: %u\n",
 779                                  param);
 780                         continue;
 781                 }
 782         }
 783
 784         dev_dbg(pctldev->dev, "%s: reg=0x%08x\n", __func__, conf);
 785         atmel_pin_config_write(pctldev, pin_id, conf);
 786
 787         return 0;
 788 }
 789
 790 static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
 791                                            struct seq_file *s, unsigned pin_id)
 792 {
 793         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 794         u32 conf;
 795
 796         if (!atmel_pioctrl->pins[pin_id]->device)
 797                 return;
 798
 799         if (atmel_pioctrl->pins[pin_id])
 800                 seq_printf(s, " (%s, ioset %u) ",
 801                            atmel_pioctrl->pins[pin_id]->device,
 802                            atmel_pioctrl->pins[pin_id]->ioset);
 803
 804         conf = atmel_pin_config_read(pctldev, pin_id);
 805         if (conf & ATMEL_PIO_PUEN_MASK)
 806                 seq_printf(s, "%s ", "pull-up");
 807         if (conf & ATMEL_PIO_PDEN_MASK)
 808                 seq_printf(s, "%s ", "pull-down");
 809         if (conf & ATMEL_PIO_IFEN_MASK)
 810                 seq_printf(s, "%s ", "debounce");
 811         if (conf & ATMEL_PIO_OPD_MASK)
 812                 seq_printf(s, "%s ", "open-drain");
 813         if (conf & ATMEL_PIO_SCHMITT_MASK)
 814                 seq_printf(s, "%s ", "schmitt");
 815 }
 816
 817 static const struct pinconf_ops atmel_confops = {
 818         .pin_config_group_get   = atmel_conf_pin_config_group_get,
 819         .pin_config_group_set   = atmel_conf_pin_config_group_set,
 820         .pin_config_dbg_show    = atmel_conf_pin_config_dbg_show,
 821 };
 822
 823 static struct pinctrl_desc atmel_pinctrl_desc = {
 824         .name           = "atmel_pinctrl",
 825         .confops        = &atmel_confops,
 826         .pctlops        = &atmel_pctlops,
 827         .pmxops         = &atmel_pmxops,
 828 };
 829
 830 static int __maybe_unused atmel_pctrl_suspend(struct device *dev)
 831 {
 832         struct platform_device *pdev = to_platform_device(dev);
 833         struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
 834         int i, j;
 835
 836         /*
 837          * For each bank, save IMR to restore it later and disable all GPIO
 838          * interrupts excepting the ones marked as wakeup sources.
 839          */
 840         for (i = 0; i < atmel_pioctrl->nbanks; i++) {
 841                 atmel_pioctrl->pm_suspend_backup[i].imr =
 842                         atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR);
 843                 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR,
 844                                  ~atmel_pioctrl->pm_wakeup_sources[i]);
 845                 atmel_pioctrl->pm_suspend_backup[i].odsr =
 846                         atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_ODSR);
 847                 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
 848                         atmel_gpio_write(atmel_pioctrl, i,
 849                                          ATMEL_PIO_MSKR, BIT(j));
 850                         atmel_pioctrl->pm_suspend_backup[i].cfgr[j] =
 851                                 atmel_gpio_read(atmel_pioctrl, i,
 852                                                 ATMEL_PIO_CFGR);
 853                 }
 854         }
 855
 856         return 0;
 857 }
 858
 859 static int __maybe_unused atmel_pctrl_resume(struct device *dev)
 860 {
 861         struct platform_device *pdev = to_platform_device(dev);
 862         struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
 863         int i, j;
 864
 865         for (i = 0; i < atmel_pioctrl->nbanks; i++) {
 866                 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER,
 867                                  atmel_pioctrl->pm_suspend_backup[i].imr);
 868                 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_SODR,
 869                                  atmel_pioctrl->pm_suspend_backup[i].odsr);
 870                 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
 871                         atmel_gpio_write(atmel_pioctrl, i,
 872                                          ATMEL_PIO_MSKR, BIT(j));
 873                         atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_CFGR,
 874                                          atmel_pioctrl->pm_suspend_backup[i].cfgr[j]);
 875                 }
 876         }
 877
 878         return 0;
 879 }
 880
 881 static const struct dev_pm_ops atmel_pctrl_pm_ops = {
 882         SET_SYSTEM_SLEEP_PM_OPS(atmel_pctrl_suspend, atmel_pctrl_resume)
 883 };
 884
 885 /*
 886  * The number of banks can be different from a SoC to another one.
 887  * We can have up to 16 banks.
 888  */
 889 static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = {
 890         .nbanks         = 4,
 891 };
 892
 893 static const struct of_device_id atmel_pctrl_of_match[] = {
 894         {
 895                 .compatible = "atmel,sama5d2-pinctrl",
 896                 .data = &atmel_sama5d2_pioctrl_data,
 897         }, {
 898                 /* sentinel */
 899         }
 900 };
 901
 902 static int atmel_pinctrl_probe(struct platform_device *pdev)
 903 {
 904         struct device *dev = &pdev->dev;
 905         struct pinctrl_pin_desc *pin_desc;
 906         const char **group_names;
 907         const struct of_device_id *match;
 908         int i, ret;
 909         struct resource *res;
 910         struct atmel_pioctrl *atmel_pioctrl;
 911         struct atmel_pioctrl_data *atmel_pioctrl_data;
 912
 913         atmel_pioctrl = devm_kzalloc(dev, sizeof(*atmel_pioctrl), GFP_KERNEL);
 914         if (!atmel_pioctrl)
 915                 return -ENOMEM;
 916         atmel_pioctrl->dev = dev;
 917         atmel_pioctrl->node = dev->of_node;
 918         platform_set_drvdata(pdev, atmel_pioctrl);
 919
 920         match = of_match_node(atmel_pctrl_of_match, dev->of_node);
 921         if (!match) {
 922                 dev_err(dev, "unknown compatible string\n");
 923                 return -ENODEV;
 924         }
 925         atmel_pioctrl_data = (struct atmel_pioctrl_data *)match->data;
 926         atmel_pioctrl->nbanks = atmel_pioctrl_data->nbanks;
 927         atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK;
 928
 929         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 930         if (!res) {
 931                 dev_err(dev, "unable to get atmel pinctrl resource\n");
 932                 return -EINVAL;
 933         }
 934         atmel_pioctrl->reg_base = devm_ioremap_resource(dev, res);
 935         if (IS_ERR(atmel_pioctrl->reg_base))
 936                 return -EINVAL;
 937
 938         atmel_pioctrl->clk = devm_clk_get(dev, NULL);
 939         if (IS_ERR(atmel_pioctrl->clk)) {
 940                 dev_err(dev, "failed to get clock\n");
 941                 return PTR_ERR(atmel_pioctrl->clk);
 942         }
 943
 944         atmel_pioctrl->pins = devm_kzalloc(dev, sizeof(*atmel_pioctrl->pins)
 945                         * atmel_pioctrl->npins, GFP_KERNEL);
 946         if (!atmel_pioctrl->pins)
 947                 return -ENOMEM;
 948
 949         pin_desc = devm_kzalloc(dev, sizeof(*pin_desc)
 950                         * atmel_pioctrl->npins, GFP_KERNEL);
 951         if (!pin_desc)
 952                 return -ENOMEM;
 953         atmel_pinctrl_desc.pins = pin_desc;
 954         atmel_pinctrl_desc.npins = atmel_pioctrl->npins;
 955
 956         /* One pin is one group since a pin can achieve all functions. */
 957         group_names = devm_kzalloc(dev, sizeof(*group_names)
 958                         * atmel_pioctrl->npins, GFP_KERNEL);
 959         if (!group_names)
 960                 return -ENOMEM;
 961         atmel_pioctrl->group_names = group_names;
 962
 963         atmel_pioctrl->groups = devm_kzalloc(&pdev->dev,
 964                         sizeof(*atmel_pioctrl->groups) * atmel_pioctrl->npins,
 965                         GFP_KERNEL);
 966         if (!atmel_pioctrl->groups)
 967                 return -ENOMEM;
 968         for (i = 0 ; i < atmel_pioctrl->npins; i++) {
 969                 struct atmel_group *group = atmel_pioctrl->groups + i;
 970                 unsigned bank = ATMEL_PIO_BANK(i);
 971                 unsigned line = ATMEL_PIO_LINE(i);
 972
 973                 atmel_pioctrl->pins[i] = devm_kzalloc(dev,
 974                                 sizeof(**atmel_pioctrl->pins), GFP_KERNEL);
 975                 if (!atmel_pioctrl->pins[i])
 976                         return -ENOMEM;
 977
 978                 atmel_pioctrl->pins[i]->pin_id = i;
 979                 atmel_pioctrl->pins[i]->bank = bank;
 980                 atmel_pioctrl->pins[i]->line = line;
 981
 982                 pin_desc[i].number = i;
 983                 /* Pin naming convention: P(bank_name)(bank_pin_number). */
 984                 pin_desc[i].name = kasprintf(GFP_KERNEL, "P%c%d",
 985                                              bank + 'A', line);
 986
 987                 group->name = group_names[i] = pin_desc[i].name;
 988                 group->pin = pin_desc[i].number;
 989
 990                 dev_dbg(dev, "pin_id=%u, bank=%u, line=%u", i, bank, line);
 991         }
 992
 993         atmel_pioctrl->gpio_chip = &atmel_gpio_chip;
 994         atmel_pioctrl->gpio_chip->of_node = dev->of_node;
 995         atmel_pioctrl->gpio_chip->ngpio = atmel_pioctrl->npins;
 996         atmel_pioctrl->gpio_chip->label = dev_name(dev);
 997         atmel_pioctrl->gpio_chip->parent = dev;
 998         atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names;
 999
1000         atmel_pioctrl->pm_wakeup_sources = devm_kzalloc(dev,
1001                         sizeof(*atmel_pioctrl->pm_wakeup_sources)
1002                         * atmel_pioctrl->nbanks, GFP_KERNEL);
1003         if (!atmel_pioctrl->pm_wakeup_sources)
1004                 return -ENOMEM;
1005
1006         atmel_pioctrl->pm_suspend_backup = devm_kzalloc(dev,
1007                         sizeof(*atmel_pioctrl->pm_suspend_backup)
1008                         * atmel_pioctrl->nbanks, GFP_KERNEL);
1009         if (!atmel_pioctrl->pm_suspend_backup)
1010                 return -ENOMEM;
1011
1012         atmel_pioctrl->irqs = devm_kzalloc(dev, sizeof(*atmel_pioctrl->irqs)
1013                         * atmel_pioctrl->nbanks, GFP_KERNEL);
1014         if (!atmel_pioctrl->irqs)
1015                 return -ENOMEM;
1016
1017         /* There is one controller but each bank has its own irq line. */
1018         for (i = 0; i < atmel_pioctrl->nbanks; i++) {
1019                 res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
1020                 if (!res) {
1021                         dev_err(dev, "missing irq resource for group %c\n",
1022                                 'A' + i);
1023                         return -EINVAL;
1024                 }
1025                 atmel_pioctrl->irqs[i] = res->start;
1026                 irq_set_chained_handler(res->start, atmel_gpio_irq_handler);
1027                 irq_set_handler_data(res->start, atmel_pioctrl);
1028                 dev_dbg(dev, "bank %i: irq=%pr\n", i, res);
1029         }
1030
1031         atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
1032                         atmel_pioctrl->gpio_chip->ngpio,
1033                         &irq_domain_simple_ops, NULL);
1034         if (!atmel_pioctrl->irq_domain) {
1035                 dev_err(dev, "can't add the irq domain\n");
1036                 return -ENODEV;
1037         }
1038         atmel_pioctrl->irq_domain->name = "atmel gpio";
1039
1040         for (i = 0; i < atmel_pioctrl->npins; i++) {
1041                 int irq = irq_create_mapping(atmel_pioctrl->irq_domain, i);
1042
1043                 irq_set_chip_and_handler(irq, &atmel_gpio_irq_chip,
1044                                          handle_simple_irq);
1045                 irq_set_chip_data(irq, atmel_pioctrl);
1046                 dev_dbg(dev,
1047                         "atmel gpio irq domain: hwirq: %d, linux irq: %d\n",
1048                         i, irq);
1049         }
1050
1051         ret = clk_prepare_enable(atmel_pioctrl->clk);
1052         if (ret) {
1053                 dev_err(dev, "failed to prepare and enable clock\n");
1054                 goto clk_prepare_enable_error;
1055         }
1056
1057         atmel_pioctrl->pinctrl_dev = devm_pinctrl_register(&pdev->dev,
1058                                                            &atmel_pinctrl_desc,
1059                                                            atmel_pioctrl);
1060         if (IS_ERR(atmel_pioctrl->pinctrl_dev)) {
1061                 ret = PTR_ERR(atmel_pioctrl->pinctrl_dev);
1062                 dev_err(dev, "pinctrl registration failed\n");
1063                 goto clk_unprep;
1064         }
1065
1066         ret = gpiochip_add_data(atmel_pioctrl->gpio_chip, atmel_pioctrl);
1067         if (ret) {
1068                 dev_err(dev, "failed to add gpiochip\n");
1069                 goto clk_unprep;
1070         }
1071
1072         ret = gpiochip_add_pin_range(atmel_pioctrl->gpio_chip, dev_name(dev),
1073                                      0, 0, atmel_pioctrl->gpio_chip->ngpio);
1074         if (ret) {
1075                 dev_err(dev, "failed to add gpio pin range\n");
1076                 goto gpiochip_add_pin_range_error;
1077         }
1078
1079         dev_info(&pdev->dev, "atmel pinctrl initialized\n");
1080
1081         return 0;
1082
1083 gpiochip_add_pin_range_error:
1084         gpiochip_remove(atmel_pioctrl->gpio_chip);
1085
1086 clk_unprep:
1087         clk_disable_unprepare(atmel_pioctrl->clk);
1088
1089 clk_prepare_enable_error:
1090         irq_domain_remove(atmel_pioctrl->irq_domain);
1091
1092         return ret;
1093 }
1094
1095 static struct platform_driver atmel_pinctrl_driver = {
1096         .driver = {
1097                 .name = "pinctrl-at91-pio4",
1098                 .of_match_table = atmel_pctrl_of_match,
1099                 .pm = &atmel_pctrl_pm_ops,
1100                 .suppress_bind_attrs = true,
1101         },
1102         .probe = atmel_pinctrl_probe,
1103 };
1104 builtin_platform_driver(atmel_pinctrl_driver);