drivers/gpio/gpio-lpc32xx.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * GPIO driver for LPC32xx SoC
   4  *
   5  * Author: Kevin Wells <[email protected]>
   6  *
   7  * Copyright (C) 2010 NXP Semiconductors
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/io.h>
  13 #include <linux/errno.h>
  14 #include <linux/gpio/driver.h>
  15 #include <linux/of.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/module.h>
  18
  19 #include <mach/hardware.h>
  20 #include <mach/platform.h>
  21
  22 #define LPC32XX_GPIO_P3_INP_STATE               _GPREG(0x000)
  23 #define LPC32XX_GPIO_P3_OUTP_SET                _GPREG(0x004)
  24 #define LPC32XX_GPIO_P3_OUTP_CLR                _GPREG(0x008)
  25 #define LPC32XX_GPIO_P3_OUTP_STATE              _GPREG(0x00C)
  26 #define LPC32XX_GPIO_P2_DIR_SET                 _GPREG(0x010)
  27 #define LPC32XX_GPIO_P2_DIR_CLR                 _GPREG(0x014)
  28 #define LPC32XX_GPIO_P2_DIR_STATE               _GPREG(0x018)
  29 #define LPC32XX_GPIO_P2_INP_STATE               _GPREG(0x01C)
  30 #define LPC32XX_GPIO_P2_OUTP_SET                _GPREG(0x020)
  31 #define LPC32XX_GPIO_P2_OUTP_CLR                _GPREG(0x024)
  32 #define LPC32XX_GPIO_P2_MUX_SET                 _GPREG(0x028)
  33 #define LPC32XX_GPIO_P2_MUX_CLR                 _GPREG(0x02C)
  34 #define LPC32XX_GPIO_P2_MUX_STATE               _GPREG(0x030)
  35 #define LPC32XX_GPIO_P0_INP_STATE               _GPREG(0x040)
  36 #define LPC32XX_GPIO_P0_OUTP_SET                _GPREG(0x044)
  37 #define LPC32XX_GPIO_P0_OUTP_CLR                _GPREG(0x048)
  38 #define LPC32XX_GPIO_P0_OUTP_STATE              _GPREG(0x04C)
  39 #define LPC32XX_GPIO_P0_DIR_SET                 _GPREG(0x050)
  40 #define LPC32XX_GPIO_P0_DIR_CLR                 _GPREG(0x054)
  41 #define LPC32XX_GPIO_P0_DIR_STATE               _GPREG(0x058)
  42 #define LPC32XX_GPIO_P1_INP_STATE               _GPREG(0x060)
  43 #define LPC32XX_GPIO_P1_OUTP_SET                _GPREG(0x064)
  44 #define LPC32XX_GPIO_P1_OUTP_CLR                _GPREG(0x068)
  45 #define LPC32XX_GPIO_P1_OUTP_STATE              _GPREG(0x06C)
  46 #define LPC32XX_GPIO_P1_DIR_SET                 _GPREG(0x070)
  47 #define LPC32XX_GPIO_P1_DIR_CLR                 _GPREG(0x074)
  48 #define LPC32XX_GPIO_P1_DIR_STATE               _GPREG(0x078)
  49
  50 #define GPIO012_PIN_TO_BIT(x)                   (1 << (x))
  51 #define GPIO3_PIN_TO_BIT(x)                     (1 << ((x) + 25))
  52 #define GPO3_PIN_TO_BIT(x)                      (1 << (x))
  53 #define GPIO012_PIN_IN_SEL(x, y)                (((x) >> (y)) & 1)
  54 #define GPIO3_PIN_IN_SHIFT(x)                   ((x) == 5 ? 24 : 10 + (x))
  55 #define GPIO3_PIN_IN_SEL(x, y)                  (((x) >> GPIO3_PIN_IN_SHIFT(y)) & 1)
  56 #define GPIO3_PIN5_IN_SEL(x)                    (((x) >> 24) & 1)
  57 #define GPI3_PIN_IN_SEL(x, y)                   (((x) >> (y)) & 1)
  58 #define GPO3_PIN_IN_SEL(x, y)                   (((x) >> (y)) & 1)
  59
  60 #define LPC32XX_GPIO_P0_MAX     8
  61 #define LPC32XX_GPIO_P1_MAX     24
  62 #define LPC32XX_GPIO_P2_MAX     13
  63 #define LPC32XX_GPIO_P3_MAX     6
  64 #define LPC32XX_GPI_P3_MAX      29
  65 #define LPC32XX_GPO_P3_MAX      24
  66
  67 #define LPC32XX_GPIO_P0_GRP     0
  68 #define LPC32XX_GPIO_P1_GRP     (LPC32XX_GPIO_P0_GRP + LPC32XX_GPIO_P0_MAX)
  69 #define LPC32XX_GPIO_P2_GRP     (LPC32XX_GPIO_P1_GRP + LPC32XX_GPIO_P1_MAX)
  70 #define LPC32XX_GPIO_P3_GRP     (LPC32XX_GPIO_P2_GRP + LPC32XX_GPIO_P2_MAX)
  71 #define LPC32XX_GPI_P3_GRP      (LPC32XX_GPIO_P3_GRP + LPC32XX_GPIO_P3_MAX)
  72 #define LPC32XX_GPO_P3_GRP      (LPC32XX_GPI_P3_GRP + LPC32XX_GPI_P3_MAX)
  73
  74 struct gpio_regs {
  75         void __iomem *inp_state;
  76         void __iomem *outp_state;
  77         void __iomem *outp_set;
  78         void __iomem *outp_clr;
  79         void __iomem *dir_set;
  80         void __iomem *dir_clr;
  81 };
  82
  83 /*
  84  * GPIO names
  85  */
  86 static const char *gpio_p0_names[LPC32XX_GPIO_P0_MAX] = {
  87         "p0.0", "p0.1", "p0.2", "p0.3",
  88         "p0.4", "p0.5", "p0.6", "p0.7"
  89 };
  90
  91 static const char *gpio_p1_names[LPC32XX_GPIO_P1_MAX] = {
  92         "p1.0", "p1.1", "p1.2", "p1.3",
  93         "p1.4", "p1.5", "p1.6", "p1.7",
  94         "p1.8", "p1.9", "p1.10", "p1.11",
  95         "p1.12", "p1.13", "p1.14", "p1.15",
  96         "p1.16", "p1.17", "p1.18", "p1.19",
  97         "p1.20", "p1.21", "p1.22", "p1.23",
  98 };
  99
 100 static const char *gpio_p2_names[LPC32XX_GPIO_P2_MAX] = {
 101         "p2.0", "p2.1", "p2.2", "p2.3",
 102         "p2.4", "p2.5", "p2.6", "p2.7",
 103         "p2.8", "p2.9", "p2.10", "p2.11",
 104         "p2.12"
 105 };
 106
 107 static const char *gpio_p3_names[LPC32XX_GPIO_P3_MAX] = {
 108         "gpio00", "gpio01", "gpio02", "gpio03",
 109         "gpio04", "gpio05"
 110 };
 111
 112 static const char *gpi_p3_names[LPC32XX_GPI_P3_MAX] = {
 113         "gpi00", "gpi01", "gpi02", "gpi03",
 114         "gpi04", "gpi05", "gpi06", "gpi07",
 115         "gpi08", "gpi09",  NULL,    NULL,
 116          NULL,    NULL,    NULL,   "gpi15",
 117         "gpi16", "gpi17", "gpi18", "gpi19",
 118         "gpi20", "gpi21", "gpi22", "gpi23",
 119         "gpi24", "gpi25", "gpi26", "gpi27",
 120         "gpi28"
 121 };
 122
 123 static const char *gpo_p3_names[LPC32XX_GPO_P3_MAX] = {
 124         "gpo00", "gpo01", "gpo02", "gpo03",
 125         "gpo04", "gpo05", "gpo06", "gpo07",
 126         "gpo08", "gpo09", "gpo10", "gpo11",
 127         "gpo12", "gpo13", "gpo14", "gpo15",
 128         "gpo16", "gpo17", "gpo18", "gpo19",
 129         "gpo20", "gpo21", "gpo22", "gpo23"
 130 };
 131
 132 static struct gpio_regs gpio_grp_regs_p0 = {
 133         .inp_state      = LPC32XX_GPIO_P0_INP_STATE,
 134         .outp_set       = LPC32XX_GPIO_P0_OUTP_SET,
 135         .outp_clr       = LPC32XX_GPIO_P0_OUTP_CLR,
 136         .dir_set        = LPC32XX_GPIO_P0_DIR_SET,
 137         .dir_clr        = LPC32XX_GPIO_P0_DIR_CLR,
 138 };
 139
 140 static struct gpio_regs gpio_grp_regs_p1 = {
 141         .inp_state      = LPC32XX_GPIO_P1_INP_STATE,
 142         .outp_set       = LPC32XX_GPIO_P1_OUTP_SET,
 143         .outp_clr       = LPC32XX_GPIO_P1_OUTP_CLR,
 144         .dir_set        = LPC32XX_GPIO_P1_DIR_SET,
 145         .dir_clr        = LPC32XX_GPIO_P1_DIR_CLR,
 146 };
 147
 148 static struct gpio_regs gpio_grp_regs_p2 = {
 149         .inp_state      = LPC32XX_GPIO_P2_INP_STATE,
 150         .outp_set       = LPC32XX_GPIO_P2_OUTP_SET,
 151         .outp_clr       = LPC32XX_GPIO_P2_OUTP_CLR,
 152         .dir_set        = LPC32XX_GPIO_P2_DIR_SET,
 153         .dir_clr        = LPC32XX_GPIO_P2_DIR_CLR,
 154 };
 155
 156 static struct gpio_regs gpio_grp_regs_p3 = {
 157         .inp_state      = LPC32XX_GPIO_P3_INP_STATE,
 158         .outp_state     = LPC32XX_GPIO_P3_OUTP_STATE,
 159         .outp_set       = LPC32XX_GPIO_P3_OUTP_SET,
 160         .outp_clr       = LPC32XX_GPIO_P3_OUTP_CLR,
 161         .dir_set        = LPC32XX_GPIO_P2_DIR_SET,
 162         .dir_clr        = LPC32XX_GPIO_P2_DIR_CLR,
 163 };
 164
 165 struct lpc32xx_gpio_chip {
 166         struct gpio_chip        chip;
 167         struct gpio_regs        *gpio_grp;
 168 };
 169
 170 static void __set_gpio_dir_p012(struct lpc32xx_gpio_chip *group,
 171         unsigned pin, int input)
 172 {
 173         if (input)
 174                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 175                         group->gpio_grp->dir_clr);
 176         else
 177                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 178                         group->gpio_grp->dir_set);
 179 }
 180
 181 static void __set_gpio_dir_p3(struct lpc32xx_gpio_chip *group,
 182         unsigned pin, int input)
 183 {
 184         u32 u = GPIO3_PIN_TO_BIT(pin);
 185
 186         if (input)
 187                 __raw_writel(u, group->gpio_grp->dir_clr);
 188         else
 189                 __raw_writel(u, group->gpio_grp->dir_set);
 190 }
 191
 192 static void __set_gpio_level_p012(struct lpc32xx_gpio_chip *group,
 193         unsigned pin, int high)
 194 {
 195         if (high)
 196                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 197                         group->gpio_grp->outp_set);
 198         else
 199                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 200                         group->gpio_grp->outp_clr);
 201 }
 202
 203 static void __set_gpio_level_p3(struct lpc32xx_gpio_chip *group,
 204         unsigned pin, int high)
 205 {
 206         u32 u = GPIO3_PIN_TO_BIT(pin);
 207
 208         if (high)
 209                 __raw_writel(u, group->gpio_grp->outp_set);
 210         else
 211                 __raw_writel(u, group->gpio_grp->outp_clr);
 212 }
 213
 214 static void __set_gpo_level_p3(struct lpc32xx_gpio_chip *group,
 215         unsigned pin, int high)
 216 {
 217         if (high)
 218                 __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_set);
 219         else
 220                 __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_clr);
 221 }
 222
 223 static int __get_gpio_state_p012(struct lpc32xx_gpio_chip *group,
 224         unsigned pin)
 225 {
 226         return GPIO012_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state),
 227                 pin);
 228 }
 229
 230 static int __get_gpio_state_p3(struct lpc32xx_gpio_chip *group,
 231         unsigned pin)
 232 {
 233         int state = __raw_readl(group->gpio_grp->inp_state);
 234
 235         /*
 236          * P3 GPIO pin input mapping is not contiguous, GPIOP3-0..4 is mapped
 237          * to bits 10..14, while GPIOP3-5 is mapped to bit 24.
 238          */
 239         return GPIO3_PIN_IN_SEL(state, pin);
 240 }
 241
 242 static int __get_gpi_state_p3(struct lpc32xx_gpio_chip *group,
 243         unsigned pin)
 244 {
 245         return GPI3_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state), pin);
 246 }
 247
 248 static int __get_gpo_state_p3(struct lpc32xx_gpio_chip *group,
 249         unsigned pin)
 250 {
 251         return GPO3_PIN_IN_SEL(__raw_readl(group->gpio_grp->outp_state), pin);
 252 }
 253
 254 /*
 255  * GPIO primitives.
 256  */
 257 static int lpc32xx_gpio_dir_input_p012(struct gpio_chip *chip,
 258         unsigned pin)
 259 {
 260         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 261
 262         __set_gpio_dir_p012(group, pin, 1);
 263
 264         return 0;
 265 }
 266
 267 static int lpc32xx_gpio_dir_input_p3(struct gpio_chip *chip,
 268         unsigned pin)
 269 {
 270         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 271
 272         __set_gpio_dir_p3(group, pin, 1);
 273
 274         return 0;
 275 }
 276
 277 static int lpc32xx_gpio_dir_in_always(struct gpio_chip *chip,
 278         unsigned pin)
 279 {
 280         return 0;
 281 }
 282
 283 static int lpc32xx_gpio_get_value_p012(struct gpio_chip *chip, unsigned pin)
 284 {
 285         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 286
 287         return !!__get_gpio_state_p012(group, pin);
 288 }
 289
 290 static int lpc32xx_gpio_get_value_p3(struct gpio_chip *chip, unsigned pin)
 291 {
 292         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 293
 294         return !!__get_gpio_state_p3(group, pin);
 295 }
 296
 297 static int lpc32xx_gpi_get_value(struct gpio_chip *chip, unsigned pin)
 298 {
 299         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 300
 301         return !!__get_gpi_state_p3(group, pin);
 302 }
 303
 304 static int lpc32xx_gpio_dir_output_p012(struct gpio_chip *chip, unsigned pin,
 305         int value)
 306 {
 307         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 308
 309         __set_gpio_level_p012(group, pin, value);
 310         __set_gpio_dir_p012(group, pin, 0);
 311
 312         return 0;
 313 }
 314
 315 static int lpc32xx_gpio_dir_output_p3(struct gpio_chip *chip, unsigned pin,
 316         int value)
 317 {
 318         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 319
 320         __set_gpio_level_p3(group, pin, value);
 321         __set_gpio_dir_p3(group, pin, 0);
 322
 323         return 0;
 324 }
 325
 326 static int lpc32xx_gpio_dir_out_always(struct gpio_chip *chip, unsigned pin,
 327         int value)
 328 {
 329         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 330
 331         __set_gpo_level_p3(group, pin, value);
 332         return 0;
 333 }
 334
 335 static void lpc32xx_gpio_set_value_p012(struct gpio_chip *chip, unsigned pin,
 336         int value)
 337 {
 338         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 339
 340         __set_gpio_level_p012(group, pin, value);
 341 }
 342
 343 static void lpc32xx_gpio_set_value_p3(struct gpio_chip *chip, unsigned pin,
 344         int value)
 345 {
 346         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 347
 348         __set_gpio_level_p3(group, pin, value);
 349 }
 350
 351 static void lpc32xx_gpo_set_value(struct gpio_chip *chip, unsigned pin,
 352         int value)
 353 {
 354         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 355
 356         __set_gpo_level_p3(group, pin, value);
 357 }
 358
 359 static int lpc32xx_gpo_get_value(struct gpio_chip *chip, unsigned pin)
 360 {
 361         struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip);
 362
 363         return !!__get_gpo_state_p3(group, pin);
 364 }
 365
 366 static int lpc32xx_gpio_request(struct gpio_chip *chip, unsigned pin)
 367 {
 368         if (pin < chip->ngpio)
 369                 return 0;
 370
 371         return -EINVAL;
 372 }
 373
 374 static int lpc32xx_gpio_to_irq_p01(struct gpio_chip *chip, unsigned offset)
 375 {
 376         return -ENXIO;
 377 }
 378
 379 static int lpc32xx_gpio_to_irq_gpio_p3(struct gpio_chip *chip, unsigned offset)
 380 {
 381         return -ENXIO;
 382 }
 383
 384 static int lpc32xx_gpio_to_irq_gpi_p3(struct gpio_chip *chip, unsigned offset)
 385 {
 386         return -ENXIO;
 387 }
 388
 389 static struct lpc32xx_gpio_chip lpc32xx_gpiochip[] = {
 390         {
 391                 .chip = {
 392                         .label                  = "gpio_p0",
 393                         .direction_input        = lpc32xx_gpio_dir_input_p012,
 394                         .get                    = lpc32xx_gpio_get_value_p012,
 395                         .direction_output       = lpc32xx_gpio_dir_output_p012,
 396                         .set                    = lpc32xx_gpio_set_value_p012,
 397                         .request                = lpc32xx_gpio_request,
 398                         .to_irq                 = lpc32xx_gpio_to_irq_p01,
 399                         .base                   = LPC32XX_GPIO_P0_GRP,
 400                         .ngpio                  = LPC32XX_GPIO_P0_MAX,
 401                         .names                  = gpio_p0_names,
 402                         .can_sleep              = false,
 403                 },
 404                 .gpio_grp = &gpio_grp_regs_p0,
 405         },
 406         {
 407                 .chip = {
 408                         .label                  = "gpio_p1",
 409                         .direction_input        = lpc32xx_gpio_dir_input_p012,
 410                         .get                    = lpc32xx_gpio_get_value_p012,
 411                         .direction_output       = lpc32xx_gpio_dir_output_p012,
 412                         .set                    = lpc32xx_gpio_set_value_p012,
 413                         .request                = lpc32xx_gpio_request,
 414                         .to_irq                 = lpc32xx_gpio_to_irq_p01,
 415                         .base                   = LPC32XX_GPIO_P1_GRP,
 416                         .ngpio                  = LPC32XX_GPIO_P1_MAX,
 417                         .names                  = gpio_p1_names,
 418                         .can_sleep              = false,
 419                 },
 420                 .gpio_grp = &gpio_grp_regs_p1,
 421         },
 422         {
 423                 .chip = {
 424                         .label                  = "gpio_p2",
 425                         .direction_input        = lpc32xx_gpio_dir_input_p012,
 426                         .get                    = lpc32xx_gpio_get_value_p012,
 427                         .direction_output       = lpc32xx_gpio_dir_output_p012,
 428                         .set                    = lpc32xx_gpio_set_value_p012,
 429                         .request                = lpc32xx_gpio_request,
 430                         .base                   = LPC32XX_GPIO_P2_GRP,
 431                         .ngpio                  = LPC32XX_GPIO_P2_MAX,
 432                         .names                  = gpio_p2_names,
 433                         .can_sleep              = false,
 434                 },
 435                 .gpio_grp = &gpio_grp_regs_p2,
 436         },
 437         {
 438                 .chip = {
 439                         .label                  = "gpio_p3",
 440                         .direction_input        = lpc32xx_gpio_dir_input_p3,
 441                         .get                    = lpc32xx_gpio_get_value_p3,
 442                         .direction_output       = lpc32xx_gpio_dir_output_p3,
 443                         .set                    = lpc32xx_gpio_set_value_p3,
 444                         .request                = lpc32xx_gpio_request,
 445                         .to_irq                 = lpc32xx_gpio_to_irq_gpio_p3,
 446                         .base                   = LPC32XX_GPIO_P3_GRP,
 447                         .ngpio                  = LPC32XX_GPIO_P3_MAX,
 448                         .names                  = gpio_p3_names,
 449                         .can_sleep              = false,
 450                 },
 451                 .gpio_grp = &gpio_grp_regs_p3,
 452         },
 453         {
 454                 .chip = {
 455                         .label                  = "gpi_p3",
 456                         .direction_input        = lpc32xx_gpio_dir_in_always,
 457                         .get                    = lpc32xx_gpi_get_value,
 458                         .request                = lpc32xx_gpio_request,
 459                         .to_irq                 = lpc32xx_gpio_to_irq_gpi_p3,
 460                         .base                   = LPC32XX_GPI_P3_GRP,
 461                         .ngpio                  = LPC32XX_GPI_P3_MAX,
 462                         .names                  = gpi_p3_names,
 463                         .can_sleep              = false,
 464                 },
 465                 .gpio_grp = &gpio_grp_regs_p3,
 466         },
 467         {
 468                 .chip = {
 469                         .label                  = "gpo_p3",
 470                         .direction_output       = lpc32xx_gpio_dir_out_always,
 471                         .set                    = lpc32xx_gpo_set_value,
 472                         .get                    = lpc32xx_gpo_get_value,
 473                         .request                = lpc32xx_gpio_request,
 474                         .base                   = LPC32XX_GPO_P3_GRP,
 475                         .ngpio                  = LPC32XX_GPO_P3_MAX,
 476                         .names                  = gpo_p3_names,
 477                         .can_sleep              = false,
 478                 },
 479                 .gpio_grp = &gpio_grp_regs_p3,
 480         },
 481 };
 482
 483 static int lpc32xx_of_xlate(struct gpio_chip *gc,
 484                             const struct of_phandle_args *gpiospec, u32 *flags)
 485 {
 486         /* Is this the correct bank? */
 487         u32 bank = gpiospec->args[0];
 488         if ((bank >= ARRAY_SIZE(lpc32xx_gpiochip) ||
 489             (gc != &lpc32xx_gpiochip[bank].chip)))
 490                 return -EINVAL;
 491
 492         if (flags)
 493                 *flags = gpiospec->args[2];
 494         return gpiospec->args[1];
 495 }
 496
 497 static int lpc32xx_gpio_probe(struct platform_device *pdev)
 498 {
 499         int i;
 500
 501         for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++) {
 502                 if (pdev->dev.of_node) {
 503                         lpc32xx_gpiochip[i].chip.of_xlate = lpc32xx_of_xlate;
 504                         lpc32xx_gpiochip[i].chip.of_gpio_n_cells = 3;
 505                         lpc32xx_gpiochip[i].chip.of_node = pdev->dev.of_node;
 506                 }
 507                 devm_gpiochip_add_data(&pdev->dev, &lpc32xx_gpiochip[i].chip,
 508                                   &lpc32xx_gpiochip[i]);
 509         }
 510
 511         return 0;
 512 }
 513
 514 #ifdef CONFIG_OF
 515 static const struct of_device_id lpc32xx_gpio_of_match[] = {
 516         { .compatible = "nxp,lpc3220-gpio", },
 517         { },
 518 };
 519 #endif
 520
 521 static struct platform_driver lpc32xx_gpio_driver = {
 522         .driver         = {
 523                 .name   = "lpc32xx-gpio",
 524                 .of_match_table = of_match_ptr(lpc32xx_gpio_of_match),
 525         },
 526         .probe          = lpc32xx_gpio_probe,
 527 };
 528
 529 module_platform_driver(lpc32xx_gpio_driver);