drivers/gpio/gpio-lpc32xx.c

   1 /*
   2  * GPIO driver for LPC32xx SoC
   3  *
   4  * Author: Kevin Wells <kevin.wells@nxp.com>
   5  *
   6  * Copyright (C) 2010 NXP Semiconductors
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/io.h>
  22 #include <linux/errno.h>
  23 #include <linux/gpio.h>
  24 #include <linux/of_gpio.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/module.h>
  27
  28 #include <mach/hardware.h>
  29 #include <mach/platform.h>
  30 #include <mach/gpio-lpc32xx.h>
  31 #include <mach/irqs.h>
  32
  33 #define LPC32XX_GPIO_P3_INP_STATE               _GPREG(0x000)
  34 #define LPC32XX_GPIO_P3_OUTP_SET                _GPREG(0x004)
  35 #define LPC32XX_GPIO_P3_OUTP_CLR                _GPREG(0x008)
  36 #define LPC32XX_GPIO_P3_OUTP_STATE              _GPREG(0x00C)
  37 #define LPC32XX_GPIO_P2_DIR_SET                 _GPREG(0x010)
  38 #define LPC32XX_GPIO_P2_DIR_CLR                 _GPREG(0x014)
  39 #define LPC32XX_GPIO_P2_DIR_STATE               _GPREG(0x018)
  40 #define LPC32XX_GPIO_P2_INP_STATE               _GPREG(0x01C)
  41 #define LPC32XX_GPIO_P2_OUTP_SET                _GPREG(0x020)
  42 #define LPC32XX_GPIO_P2_OUTP_CLR                _GPREG(0x024)
  43 #define LPC32XX_GPIO_P2_MUX_SET                 _GPREG(0x028)
  44 #define LPC32XX_GPIO_P2_MUX_CLR                 _GPREG(0x02C)
  45 #define LPC32XX_GPIO_P2_MUX_STATE               _GPREG(0x030)
  46 #define LPC32XX_GPIO_P0_INP_STATE               _GPREG(0x040)
  47 #define LPC32XX_GPIO_P0_OUTP_SET                _GPREG(0x044)
  48 #define LPC32XX_GPIO_P0_OUTP_CLR                _GPREG(0x048)
  49 #define LPC32XX_GPIO_P0_OUTP_STATE              _GPREG(0x04C)
  50 #define LPC32XX_GPIO_P0_DIR_SET                 _GPREG(0x050)
  51 #define LPC32XX_GPIO_P0_DIR_CLR                 _GPREG(0x054)
  52 #define LPC32XX_GPIO_P0_DIR_STATE               _GPREG(0x058)
  53 #define LPC32XX_GPIO_P1_INP_STATE               _GPREG(0x060)
  54 #define LPC32XX_GPIO_P1_OUTP_SET                _GPREG(0x064)
  55 #define LPC32XX_GPIO_P1_OUTP_CLR                _GPREG(0x068)
  56 #define LPC32XX_GPIO_P1_OUTP_STATE              _GPREG(0x06C)
  57 #define LPC32XX_GPIO_P1_DIR_SET                 _GPREG(0x070)
  58 #define LPC32XX_GPIO_P1_DIR_CLR                 _GPREG(0x074)
  59 #define LPC32XX_GPIO_P1_DIR_STATE               _GPREG(0x078)
  60
  61 #define GPIO012_PIN_TO_BIT(x)                   (1 << (x))
  62 #define GPIO3_PIN_TO_BIT(x)                     (1 << ((x) + 25))
  63 #define GPO3_PIN_TO_BIT(x)                      (1 << (x))
  64 #define GPIO012_PIN_IN_SEL(x, y)                (((x) >> (y)) & 1)
  65 #define GPIO3_PIN_IN_SHIFT(x)                   ((x) == 5 ? 24 : 10 + (x))
  66 #define GPIO3_PIN_IN_SEL(x, y)                  (((x) >> GPIO3_PIN_IN_SHIFT(y)) & 1)
  67 #define GPIO3_PIN5_IN_SEL(x)                    (((x) >> 24) & 1)
  68 #define GPI3_PIN_IN_SEL(x, y)                   (((x) >> (y)) & 1)
  69 #define GPO3_PIN_IN_SEL(x, y)                   (((x) >> (y)) & 1)
  70
  71 struct gpio_regs {
  72         void __iomem *inp_state;
  73         void __iomem *outp_state;
  74         void __iomem *outp_set;
  75         void __iomem *outp_clr;
  76         void __iomem *dir_set;
  77         void __iomem *dir_clr;
  78 };
  79
  80 /*
  81  * GPIO names
  82  */
  83 static const char *gpio_p0_names[LPC32XX_GPIO_P0_MAX] = {
  84         "p0.0", "p0.1", "p0.2", "p0.3",
  85         "p0.4", "p0.5", "p0.6", "p0.7"
  86 };
  87
  88 static const char *gpio_p1_names[LPC32XX_GPIO_P1_MAX] = {
  89         "p1.0", "p1.1", "p1.2", "p1.3",
  90         "p1.4", "p1.5", "p1.6", "p1.7",
  91         "p1.8", "p1.9", "p1.10", "p1.11",
  92         "p1.12", "p1.13", "p1.14", "p1.15",
  93         "p1.16", "p1.17", "p1.18", "p1.19",
  94         "p1.20", "p1.21", "p1.22", "p1.23",
  95 };
  96
  97 static const char *gpio_p2_names[LPC32XX_GPIO_P2_MAX] = {
  98         "p2.0", "p2.1", "p2.2", "p2.3",
  99         "p2.4", "p2.5", "p2.6", "p2.7",
 100         "p2.8", "p2.9", "p2.10", "p2.11",
 101         "p2.12"
 102 };
 103
 104 static const char *gpio_p3_names[LPC32XX_GPIO_P3_MAX] = {
 105         "gpio00", "gpio01", "gpio02", "gpio03",
 106         "gpio04", "gpio05"
 107 };
 108
 109 static const char *gpi_p3_names[LPC32XX_GPI_P3_MAX] = {
 110         "gpi00", "gpi01", "gpi02", "gpi03",
 111         "gpi04", "gpi05", "gpi06", "gpi07",
 112         "gpi08", "gpi09",  NULL,    NULL,
 113          NULL,    NULL,    NULL,   "gpi15",
 114         "gpi16", "gpi17", "gpi18", "gpi19",
 115         "gpi20", "gpi21", "gpi22", "gpi23",
 116         "gpi24", "gpi25", "gpi26", "gpi27",
 117         "gpi28"
 118 };
 119
 120 static const char *gpo_p3_names[LPC32XX_GPO_P3_MAX] = {
 121         "gpo00", "gpo01", "gpo02", "gpo03",
 122         "gpo04", "gpo05", "gpo06", "gpo07",
 123         "gpo08", "gpo09", "gpo10", "gpo11",
 124         "gpo12", "gpo13", "gpo14", "gpo15",
 125         "gpo16", "gpo17", "gpo18", "gpo19",
 126         "gpo20", "gpo21", "gpo22", "gpo23"
 127 };
 128
 129 static struct gpio_regs gpio_grp_regs_p0 = {
 130         .inp_state      = LPC32XX_GPIO_P0_INP_STATE,
 131         .outp_set       = LPC32XX_GPIO_P0_OUTP_SET,
 132         .outp_clr       = LPC32XX_GPIO_P0_OUTP_CLR,
 133         .dir_set        = LPC32XX_GPIO_P0_DIR_SET,
 134         .dir_clr        = LPC32XX_GPIO_P0_DIR_CLR,
 135 };
 136
 137 static struct gpio_regs gpio_grp_regs_p1 = {
 138         .inp_state      = LPC32XX_GPIO_P1_INP_STATE,
 139         .outp_set       = LPC32XX_GPIO_P1_OUTP_SET,
 140         .outp_clr       = LPC32XX_GPIO_P1_OUTP_CLR,
 141         .dir_set        = LPC32XX_GPIO_P1_DIR_SET,
 142         .dir_clr        = LPC32XX_GPIO_P1_DIR_CLR,
 143 };
 144
 145 static struct gpio_regs gpio_grp_regs_p2 = {
 146         .inp_state      = LPC32XX_GPIO_P2_INP_STATE,
 147         .outp_set       = LPC32XX_GPIO_P2_OUTP_SET,
 148         .outp_clr       = LPC32XX_GPIO_P2_OUTP_CLR,
 149         .dir_set        = LPC32XX_GPIO_P2_DIR_SET,
 150         .dir_clr        = LPC32XX_GPIO_P2_DIR_CLR,
 151 };
 152
 153 static struct gpio_regs gpio_grp_regs_p3 = {
 154         .inp_state      = LPC32XX_GPIO_P3_INP_STATE,
 155         .outp_state     = LPC32XX_GPIO_P3_OUTP_STATE,
 156         .outp_set       = LPC32XX_GPIO_P3_OUTP_SET,
 157         .outp_clr       = LPC32XX_GPIO_P3_OUTP_CLR,
 158         .dir_set        = LPC32XX_GPIO_P2_DIR_SET,
 159         .dir_clr        = LPC32XX_GPIO_P2_DIR_CLR,
 160 };
 161
 162 struct lpc32xx_gpio_chip {
 163         struct gpio_chip        chip;
 164         struct gpio_regs        *gpio_grp;
 165 };
 166
 167 static inline struct lpc32xx_gpio_chip *to_lpc32xx_gpio(
 168         struct gpio_chip *gpc)
 169 {
 170         return container_of(gpc, struct lpc32xx_gpio_chip, chip);
 171 }
 172
 173 static void __set_gpio_dir_p012(struct lpc32xx_gpio_chip *group,
 174         unsigned pin, int input)
 175 {
 176         if (input)
 177                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 178                         group->gpio_grp->dir_clr);
 179         else
 180                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 181                         group->gpio_grp->dir_set);
 182 }
 183
 184 static void __set_gpio_dir_p3(struct lpc32xx_gpio_chip *group,
 185         unsigned pin, int input)
 186 {
 187         u32 u = GPIO3_PIN_TO_BIT(pin);
 188
 189         if (input)
 190                 __raw_writel(u, group->gpio_grp->dir_clr);
 191         else
 192                 __raw_writel(u, group->gpio_grp->dir_set);
 193 }
 194
 195 static void __set_gpio_level_p012(struct lpc32xx_gpio_chip *group,
 196         unsigned pin, int high)
 197 {
 198         if (high)
 199                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 200                         group->gpio_grp->outp_set);
 201         else
 202                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 203                         group->gpio_grp->outp_clr);
 204 }
 205
 206 static void __set_gpio_level_p3(struct lpc32xx_gpio_chip *group,
 207         unsigned pin, int high)
 208 {
 209         u32 u = GPIO3_PIN_TO_BIT(pin);
 210
 211         if (high)
 212                 __raw_writel(u, group->gpio_grp->outp_set);
 213         else
 214                 __raw_writel(u, group->gpio_grp->outp_clr);
 215 }
 216
 217 static void __set_gpo_level_p3(struct lpc32xx_gpio_chip *group,
 218         unsigned pin, int high)
 219 {
 220         if (high)
 221                 __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_set);
 222         else
 223                 __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_clr);
 224 }
 225
 226 static int __get_gpio_state_p012(struct lpc32xx_gpio_chip *group,
 227         unsigned pin)
 228 {
 229         return GPIO012_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state),
 230                 pin);
 231 }
 232
 233 static int __get_gpio_state_p3(struct lpc32xx_gpio_chip *group,
 234         unsigned pin)
 235 {
 236         int state = __raw_readl(group->gpio_grp->inp_state);
 237
 238         /*
 239          * P3 GPIO pin input mapping is not contiguous, GPIOP3-0..4 is mapped
 240          * to bits 10..14, while GPIOP3-5 is mapped to bit 24.
 241          */
 242         return GPIO3_PIN_IN_SEL(state, pin);
 243 }
 244
 245 static int __get_gpi_state_p3(struct lpc32xx_gpio_chip *group,
 246         unsigned pin)
 247 {
 248         return GPI3_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state), pin);
 249 }
 250
 251 static int __get_gpo_state_p3(struct lpc32xx_gpio_chip *group,
 252         unsigned pin)
 253 {
 254         return GPO3_PIN_IN_SEL(__raw_readl(group->gpio_grp->outp_state), pin);
 255 }
 256
 257 /*
 258  * GENERIC_GPIO primitives.
 259  */
 260 static int lpc32xx_gpio_dir_input_p012(struct gpio_chip *chip,
 261         unsigned pin)
 262 {
 263         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 264
 265         __set_gpio_dir_p012(group, pin, 1);
 266
 267         return 0;
 268 }
 269
 270 static int lpc32xx_gpio_dir_input_p3(struct gpio_chip *chip,
 271         unsigned pin)
 272 {
 273         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 274
 275         __set_gpio_dir_p3(group, pin, 1);
 276
 277         return 0;
 278 }
 279
 280 static int lpc32xx_gpio_dir_in_always(struct gpio_chip *chip,
 281         unsigned pin)
 282 {
 283         return 0;
 284 }
 285
 286 static int lpc32xx_gpio_get_value_p012(struct gpio_chip *chip, unsigned pin)
 287 {
 288         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 289
 290         return __get_gpio_state_p012(group, pin);
 291 }
 292
 293 static int lpc32xx_gpio_get_value_p3(struct gpio_chip *chip, unsigned pin)
 294 {
 295         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 296
 297         return __get_gpio_state_p3(group, pin);
 298 }
 299
 300 static int lpc32xx_gpi_get_value(struct gpio_chip *chip, unsigned pin)
 301 {
 302         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 303
 304         return __get_gpi_state_p3(group, pin);
 305 }
 306
 307 static int lpc32xx_gpio_dir_output_p012(struct gpio_chip *chip, unsigned pin,
 308         int value)
 309 {
 310         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 311
 312         __set_gpio_level_p012(group, pin, value);
 313         __set_gpio_dir_p012(group, pin, 0);
 314
 315         return 0;
 316 }
 317
 318 static int lpc32xx_gpio_dir_output_p3(struct gpio_chip *chip, unsigned pin,
 319         int value)
 320 {
 321         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 322
 323         __set_gpio_level_p3(group, pin, value);
 324         __set_gpio_dir_p3(group, pin, 0);
 325
 326         return 0;
 327 }
 328
 329 static int lpc32xx_gpio_dir_out_always(struct gpio_chip *chip, unsigned pin,
 330         int value)
 331 {
 332         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 333
 334         __set_gpo_level_p3(group, pin, value);
 335         return 0;
 336 }
 337
 338 static void lpc32xx_gpio_set_value_p012(struct gpio_chip *chip, unsigned pin,
 339         int value)
 340 {
 341         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 342
 343         __set_gpio_level_p012(group, pin, value);
 344 }
 345
 346 static void lpc32xx_gpio_set_value_p3(struct gpio_chip *chip, unsigned pin,
 347         int value)
 348 {
 349         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 350
 351         __set_gpio_level_p3(group, pin, value);
 352 }
 353
 354 static void lpc32xx_gpo_set_value(struct gpio_chip *chip, unsigned pin,
 355         int value)
 356 {
 357         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 358
 359         __set_gpo_level_p3(group, pin, value);
 360 }
 361
 362 static int lpc32xx_gpo_get_value(struct gpio_chip *chip, unsigned pin)
 363 {
 364         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 365
 366         return __get_gpo_state_p3(group, pin);
 367 }
 368
 369 static int lpc32xx_gpio_request(struct gpio_chip *chip, unsigned pin)
 370 {
 371         if (pin < chip->ngpio)
 372                 return 0;
 373
 374         return -EINVAL;
 375 }
 376
 377 static int lpc32xx_gpio_to_irq_p01(struct gpio_chip *chip, unsigned offset)
 378 {
 379         return IRQ_LPC32XX_P0_P1_IRQ;
 380 }
 381
 382 static const char lpc32xx_gpio_to_irq_gpio_p3_table[] = {
 383         IRQ_LPC32XX_GPIO_00,
 384         IRQ_LPC32XX_GPIO_01,
 385         IRQ_LPC32XX_GPIO_02,
 386         IRQ_LPC32XX_GPIO_03,
 387         IRQ_LPC32XX_GPIO_04,
 388         IRQ_LPC32XX_GPIO_05,
 389 };
 390
 391 static int lpc32xx_gpio_to_irq_gpio_p3(struct gpio_chip *chip, unsigned offset)
 392 {
 393         if (offset < ARRAY_SIZE(lpc32xx_gpio_to_irq_gpio_p3_table))
 394                 return lpc32xx_gpio_to_irq_gpio_p3_table[offset];
 395         return -ENXIO;
 396 }
 397
 398 static const char lpc32xx_gpio_to_irq_gpi_p3_table[] = {
 399         IRQ_LPC32XX_GPI_00,
 400         IRQ_LPC32XX_GPI_01,
 401         IRQ_LPC32XX_GPI_02,
 402         IRQ_LPC32XX_GPI_03,
 403         IRQ_LPC32XX_GPI_04,
 404         IRQ_LPC32XX_GPI_05,
 405         IRQ_LPC32XX_GPI_06,
 406         IRQ_LPC32XX_GPI_07,
 407         IRQ_LPC32XX_GPI_08,
 408         IRQ_LPC32XX_GPI_09,
 409         -ENXIO, /* 10 */
 410         -ENXIO, /* 11 */
 411         -ENXIO, /* 12 */
 412         -ENXIO, /* 13 */
 413         -ENXIO, /* 14 */
 414         -ENXIO, /* 15 */
 415         -ENXIO, /* 16 */
 416         -ENXIO, /* 17 */
 417         -ENXIO, /* 18 */
 418         IRQ_LPC32XX_GPI_19,
 419         -ENXIO, /* 20 */
 420         -ENXIO, /* 21 */
 421         -ENXIO, /* 22 */
 422         -ENXIO, /* 23 */
 423         -ENXIO, /* 24 */
 424         -ENXIO, /* 25 */
 425         -ENXIO, /* 26 */
 426         -ENXIO, /* 27 */
 427         IRQ_LPC32XX_GPI_28,
 428 };
 429
 430 static int lpc32xx_gpio_to_irq_gpi_p3(struct gpio_chip *chip, unsigned offset)
 431 {
 432         if (offset < ARRAY_SIZE(lpc32xx_gpio_to_irq_gpi_p3_table))
 433                 return lpc32xx_gpio_to_irq_gpi_p3_table[offset];
 434         return -ENXIO;
 435 }
 436
 437 static struct lpc32xx_gpio_chip lpc32xx_gpiochip[] = {
 438         {
 439                 .chip = {
 440                         .label                  = "gpio_p0",
 441                         .direction_input        = lpc32xx_gpio_dir_input_p012,
 442                         .get                    = lpc32xx_gpio_get_value_p012,
 443                         .direction_output       = lpc32xx_gpio_dir_output_p012,
 444                         .set                    = lpc32xx_gpio_set_value_p012,
 445                         .request                = lpc32xx_gpio_request,
 446                         .to_irq                 = lpc32xx_gpio_to_irq_p01,
 447                         .base                   = LPC32XX_GPIO_P0_GRP,
 448                         .ngpio                  = LPC32XX_GPIO_P0_MAX,
 449                         .names                  = gpio_p0_names,
 450                         .can_sleep              = 0,
 451                 },
 452                 .gpio_grp = &gpio_grp_regs_p0,
 453         },
 454         {
 455                 .chip = {
 456                         .label                  = "gpio_p1",
 457                         .direction_input        = lpc32xx_gpio_dir_input_p012,
 458                         .get                    = lpc32xx_gpio_get_value_p012,
 459                         .direction_output       = lpc32xx_gpio_dir_output_p012,
 460                         .set                    = lpc32xx_gpio_set_value_p012,
 461                         .request                = lpc32xx_gpio_request,
 462                         .to_irq                 = lpc32xx_gpio_to_irq_p01,
 463                         .base                   = LPC32XX_GPIO_P1_GRP,
 464                         .ngpio                  = LPC32XX_GPIO_P1_MAX,
 465                         .names                  = gpio_p1_names,
 466                         .can_sleep              = 0,
 467                 },
 468                 .gpio_grp = &gpio_grp_regs_p1,
 469         },
 470         {
 471                 .chip = {
 472                         .label                  = "gpio_p2",
 473                         .direction_input        = lpc32xx_gpio_dir_input_p012,
 474                         .get                    = lpc32xx_gpio_get_value_p012,
 475                         .direction_output       = lpc32xx_gpio_dir_output_p012,
 476                         .set                    = lpc32xx_gpio_set_value_p012,
 477                         .request                = lpc32xx_gpio_request,
 478                         .base                   = LPC32XX_GPIO_P2_GRP,
 479                         .ngpio                  = LPC32XX_GPIO_P2_MAX,
 480                         .names                  = gpio_p2_names,
 481                         .can_sleep              = 0,
 482                 },
 483                 .gpio_grp = &gpio_grp_regs_p2,
 484         },
 485         {
 486                 .chip = {
 487                         .label                  = "gpio_p3",
 488                         .direction_input        = lpc32xx_gpio_dir_input_p3,
 489                         .get                    = lpc32xx_gpio_get_value_p3,
 490                         .direction_output       = lpc32xx_gpio_dir_output_p3,
 491                         .set                    = lpc32xx_gpio_set_value_p3,
 492                         .request                = lpc32xx_gpio_request,
 493                         .to_irq                 = lpc32xx_gpio_to_irq_gpio_p3,
 494                         .base                   = LPC32XX_GPIO_P3_GRP,
 495                         .ngpio                  = LPC32XX_GPIO_P3_MAX,
 496                         .names                  = gpio_p3_names,
 497                         .can_sleep              = 0,
 498                 },
 499                 .gpio_grp = &gpio_grp_regs_p3,
 500         },
 501         {
 502                 .chip = {
 503                         .label                  = "gpi_p3",
 504                         .direction_input        = lpc32xx_gpio_dir_in_always,
 505                         .get                    = lpc32xx_gpi_get_value,
 506                         .request                = lpc32xx_gpio_request,
 507                         .to_irq                 = lpc32xx_gpio_to_irq_gpi_p3,
 508                         .base                   = LPC32XX_GPI_P3_GRP,
 509                         .ngpio                  = LPC32XX_GPI_P3_MAX,
 510                         .names                  = gpi_p3_names,
 511                         .can_sleep              = 0,
 512                 },
 513                 .gpio_grp = &gpio_grp_regs_p3,
 514         },
 515         {
 516                 .chip = {
 517                         .label                  = "gpo_p3",
 518                         .direction_output       = lpc32xx_gpio_dir_out_always,
 519                         .set                    = lpc32xx_gpo_set_value,
 520                         .get                    = lpc32xx_gpo_get_value,
 521                         .request                = lpc32xx_gpio_request,
 522                         .base                   = LPC32XX_GPO_P3_GRP,
 523                         .ngpio                  = LPC32XX_GPO_P3_MAX,
 524                         .names                  = gpo_p3_names,
 525                         .can_sleep              = 0,
 526                 },
 527                 .gpio_grp = &gpio_grp_regs_p3,
 528         },
 529 };
 530
 531 static int lpc32xx_of_xlate(struct gpio_chip *gc,
 532                             const struct of_phandle_args *gpiospec, u32 *flags)
 533 {
 534         /* Is this the correct bank? */
 535         u32 bank = gpiospec->args[0];
 536         if ((bank > ARRAY_SIZE(lpc32xx_gpiochip) ||
 537             (gc != &lpc32xx_gpiochip[bank].chip)))
 538                 return -EINVAL;
 539
 540         if (flags)
 541                 *flags = gpiospec->args[2];
 542         return gpiospec->args[1];
 543 }
 544
 545 static int __devinit lpc32xx_gpio_probe(struct platform_device *pdev)
 546 {
 547         int i;
 548
 549         for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++) {
 550                 if (pdev->dev.of_node) {
 551                         lpc32xx_gpiochip[i].chip.of_xlate = lpc32xx_of_xlate;
 552                         lpc32xx_gpiochip[i].chip.of_gpio_n_cells = 3;
 553                         lpc32xx_gpiochip[i].chip.of_node = pdev->dev.of_node;
 554                 }
 555                 gpiochip_add(&lpc32xx_gpiochip[i].chip);
 556         }
 557
 558         return 0;
 559 }
 560
 561 #ifdef CONFIG_OF
 562 static struct of_device_id lpc32xx_gpio_of_match[] __devinitdata = {
 563         { .compatible = "nxp,lpc3220-gpio", },
 564         { },
 565 };
 566 #endif
 567
 568 static struct platform_driver lpc32xx_gpio_driver = {
 569         .driver         = {
 570                 .name   = "lpc32xx-gpio",
 571                 .owner  = THIS_MODULE,
 572                 .of_match_table = of_match_ptr(lpc32xx_gpio_of_match),
 573         },
 574         .probe          = lpc32xx_gpio_probe,
 575 };
 576
 577 module_platform_driver(lpc32xx_gpio_driver);