1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Renesas R-Car GPIO Support 4 * 5 * Copyright (C) 2014 Renesas Electronics Corporation 6 * Copyright (C) 2013 Magnus Damm 7 */ 8 9 #include <linux/err.h> 10 #include <linux/gpio/driver.h> 11 #include <linux/init.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/ioport.h> 15 #include <linux/irq.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/pinctrl/consumer.h> 19 #include <linux/platform_device.h> 20 #include <linux/pm_runtime.h> 21 #include <linux/spinlock.h> 22 #include <linux/slab.h> 23 24 struct gpio_rcar_bank_info { 25 u32 iointsel; 26 u32 inoutsel; 27 u32 outdt; 28 u32 posneg; 29 u32 edglevel; 30 u32 bothedge; 31 u32 intmsk; 32 }; 33 34 struct gpio_rcar_info { 35 bool has_outdtsel; 36 bool has_both_edge_trigger; 37 bool has_always_in; 38 bool has_inen; 39 }; 40 41 struct gpio_rcar_priv { 42 void __iomem *base; 43 raw_spinlock_t lock; 44 struct device *dev; 45 struct gpio_chip gpio_chip; 46 unsigned int irq_parent; 47 atomic_t wakeup_path; 48 struct gpio_rcar_info info; 49 struct gpio_rcar_bank_info bank_info; 50 }; 51 52 #define IOINTSEL 0x00 /* General IO/Interrupt Switching Register */ 53 #define INOUTSEL 0x04 /* General Input/Output Switching Register */ 54 #define OUTDT 0x08 /* General Output Register */ 55 #define INDT 0x0c /* General Input Register */ 56 #define INTDT 0x10 /* Interrupt Display Register */ 57 #define INTCLR 0x14 /* Interrupt Clear Register */ 58 #define INTMSK 0x18 /* Interrupt Mask Register */ 59 #define MSKCLR 0x1c /* Interrupt Mask Clear Register */ 60 #define POSNEG 0x20 /* Positive/Negative Logic Select Register */ 61 #define EDGLEVEL 0x24 /* Edge/level Select Register */ 62 #define FILONOFF 0x28 /* Chattering Prevention On/Off Register */ 63 #define OUTDTSEL 0x40 /* Output Data Select Register */ 64 #define BOTHEDGE 0x4c /* One Edge/Both Edge Select Register */ 65 #define INEN 0x50 /* General Input Enable Register */ 66 67 #define RCAR_MAX_GPIO_PER_BANK 32 68 69 static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs) 70 { 71 return ioread32(p->base + offs); 72 } 73 74 static inline void gpio_rcar_write(struct gpio_rcar_priv *p, int offs, 75 u32 value) 76 { 77 iowrite32(value, p->base + offs); 78 } 79 80 static void gpio_rcar_modify_bit(struct gpio_rcar_priv *p, int offs, 81 int bit, bool value) 82 { 83 u32 tmp = gpio_rcar_read(p, offs); 84 85 if (value) 86 tmp |= BIT(bit); 87 else 88 tmp &= ~BIT(bit); 89 90 gpio_rcar_write(p, offs, tmp); 91 } 92 93 static void gpio_rcar_irq_disable(struct irq_data *d) 94 { 95 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 96 struct gpio_rcar_priv *p = gpiochip_get_data(gc); 97 irq_hw_number_t hwirq = irqd_to_hwirq(d); 98 99 gpio_rcar_write(p, INTMSK, ~BIT(hwirq)); 100 gpiochip_disable_irq(gc, hwirq); 101 } 102 103 static void gpio_rcar_irq_enable(struct irq_data *d) 104 { 105 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 106 struct gpio_rcar_priv *p = gpiochip_get_data(gc); 107 irq_hw_number_t hwirq = irqd_to_hwirq(d); 108 109 gpiochip_enable_irq(gc, hwirq); 110 gpio_rcar_write(p, MSKCLR, BIT(hwirq)); 111 } 112 113 static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p, 114 unsigned int hwirq, 115 bool active_high_rising_edge, 116 bool level_trigger, 117 bool both) 118 { 119 unsigned long flags; 120 121 /* follow steps in the GPIO documentation for 122 * "Setting Edge-Sensitive Interrupt Input Mode" and 123 * "Setting Level-Sensitive Interrupt Input Mode" 124 */ 125 126 raw_spin_lock_irqsave(&p->lock, flags); 127 128 /* Configure positive or negative logic in POSNEG */ 129 gpio_rcar_modify_bit(p, POSNEG, hwirq, !active_high_rising_edge); 130 131 /* Configure edge or level trigger in EDGLEVEL */ 132 gpio_rcar_modify_bit(p, EDGLEVEL, hwirq, !level_trigger); 133 134 /* Select one edge or both edges in BOTHEDGE */ 135 if (p->info.has_both_edge_trigger) 136 gpio_rcar_modify_bit(p, BOTHEDGE, hwirq, both); 137 138 /* Select "Interrupt Input Mode" in IOINTSEL */ 139 gpio_rcar_modify_bit(p, IOINTSEL, hwirq, true); 140 141 /* Write INTCLR in case of edge trigger */ 142 if (!level_trigger) 143 gpio_rcar_write(p, INTCLR, BIT(hwirq)); 144 145 raw_spin_unlock_irqrestore(&p->lock, flags); 146 } 147 148 static int gpio_rcar_irq_set_type(struct irq_data *d, unsigned int type) 149 { 150 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 151 struct gpio_rcar_priv *p = gpiochip_get_data(gc); 152 unsigned int hwirq = irqd_to_hwirq(d); 153 154 dev_dbg(p->dev, "sense irq = %d, type = %d\n", hwirq, type); 155 156 switch (type & IRQ_TYPE_SENSE_MASK) { 157 case IRQ_TYPE_LEVEL_HIGH: 158 gpio_rcar_config_interrupt_input_mode(p, hwirq, true, true, 159 false); 160 break; 161 case IRQ_TYPE_LEVEL_LOW: 162 gpio_rcar_config_interrupt_input_mode(p, hwirq, false, true, 163 false); 164 break; 165 case IRQ_TYPE_EDGE_RISING: 166 gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false, 167 false); 168 break; 169 case IRQ_TYPE_EDGE_FALLING: 170 gpio_rcar_config_interrupt_input_mode(p, hwirq, false, false, 171 false); 172 break; 173 case IRQ_TYPE_EDGE_BOTH: 174 if (!p->info.has_both_edge_trigger) 175 return -EINVAL; 176 gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false, 177 true); 178 break; 179 default: 180 return -EINVAL; 181 } 182 return 0; 183 } 184 185 static int gpio_rcar_irq_set_wake(struct irq_data *d, unsigned int on) 186 { 187 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 188 struct gpio_rcar_priv *p = gpiochip_get_data(gc); 189 int error; 190 191 if (p->irq_parent) { 192 error = irq_set_irq_wake(p->irq_parent, on); 193 if (error) { 194 dev_dbg(p->dev, "irq %u doesn't support irq_set_wake\n", 195 p->irq_parent); 196 p->irq_parent = 0; 197 } 198 } 199 200 if (on) 201 atomic_inc(&p->wakeup_path); 202 else 203 atomic_dec(&p->wakeup_path); 204 205 return 0; 206 } 207 208 static const struct irq_chip gpio_rcar_irq_chip = { 209 .name = "gpio-rcar", 210 .irq_mask = gpio_rcar_irq_disable, 211 .irq_unmask = gpio_rcar_irq_enable, 212 .irq_set_type = gpio_rcar_irq_set_type, 213 .irq_set_wake = gpio_rcar_irq_set_wake, 214 .flags = IRQCHIP_IMMUTABLE | IRQCHIP_SET_TYPE_MASKED | 215 IRQCHIP_MASK_ON_SUSPEND, 216 GPIOCHIP_IRQ_RESOURCE_HELPERS, 217 }; 218 219 static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id) 220 { 221 struct gpio_rcar_priv *p = dev_id; 222 u32 pending; 223 unsigned int offset, irqs_handled = 0; 224 225 while ((pending = gpio_rcar_read(p, INTDT) & 226 gpio_rcar_read(p, INTMSK))) { 227 offset = __ffs(pending); 228 gpio_rcar_write(p, INTCLR, BIT(offset)); 229 generic_handle_domain_irq(p->gpio_chip.irq.domain, 230 offset); 231 irqs_handled++; 232 } 233 234 return irqs_handled ? IRQ_HANDLED : IRQ_NONE; 235 } 236 237 static void gpio_rcar_config_general_input_output_mode(struct gpio_chip *chip, 238 unsigned int gpio, 239 bool output) 240 { 241 struct gpio_rcar_priv *p = gpiochip_get_data(chip); 242 unsigned long flags; 243 244 /* follow steps in the GPIO documentation for 245 * "Setting General Output Mode" and 246 * "Setting General Input Mode" 247 */ 248 249 raw_spin_lock_irqsave(&p->lock, flags); 250 251 /* Configure positive logic in POSNEG */ 252 gpio_rcar_modify_bit(p, POSNEG, gpio, false); 253 254 /* Select "General Input/Output Mode" in IOINTSEL */ 255 gpio_rcar_modify_bit(p, IOINTSEL, gpio, false); 256 257 /* Select Input Mode or Output Mode in INOUTSEL */ 258 gpio_rcar_modify_bit(p, INOUTSEL, gpio, output); 259 260 /* Select General Output Register to output data in OUTDTSEL */ 261 if (p->info.has_outdtsel && output) 262 gpio_rcar_modify_bit(p, OUTDTSEL, gpio, false); 263 264 raw_spin_unlock_irqrestore(&p->lock, flags); 265 } 266 267 static int gpio_rcar_request(struct gpio_chip *chip, unsigned offset) 268 { 269 struct gpio_rcar_priv *p = gpiochip_get_data(chip); 270 int error; 271 272 error = pm_runtime_get_sync(p->dev); 273 if (error < 0) { 274 pm_runtime_put(p->dev); 275 return error; 276 } 277 278 error = pinctrl_gpio_request(chip, offset); 279 if (error) 280 pm_runtime_put(p->dev); 281 282 return error; 283 } 284 285 static void gpio_rcar_free(struct gpio_chip *chip, unsigned offset) 286 { 287 struct gpio_rcar_priv *p = gpiochip_get_data(chip); 288 289 pinctrl_gpio_free(chip, offset); 290 291 /* 292 * Set the GPIO as an input to ensure that the next GPIO request won't 293 * drive the GPIO pin as an output. 294 */ 295 gpio_rcar_config_general_input_output_mode(chip, offset, false); 296 297 pm_runtime_put(p->dev); 298 } 299 300 static int gpio_rcar_get_direction(struct gpio_chip *chip, unsigned int offset) 301 { 302 struct gpio_rcar_priv *p = gpiochip_get_data(chip); 303 304 if (gpio_rcar_read(p, INOUTSEL) & BIT(offset)) 305 return GPIO_LINE_DIRECTION_OUT; 306 307 return GPIO_LINE_DIRECTION_IN; 308 } 309 310 static int gpio_rcar_direction_input(struct gpio_chip *chip, unsigned offset) 311 { 312 gpio_rcar_config_general_input_output_mode(chip, offset, false); 313 return 0; 314 } 315 316 static int gpio_rcar_get(struct gpio_chip *chip, unsigned offset) 317 { 318 struct gpio_rcar_priv *p = gpiochip_get_data(chip); 319 u32 bit = BIT(offset); 320 321 /* 322 * Before R-Car Gen3, INDT does not show correct pin state when 323 * configured as output, so use OUTDT in case of output pins 324 */ 325 if (!p->info.has_always_in && (gpio_rcar_read(p, INOUTSEL) & bit)) 326 return !!(gpio_rcar_read(p, OUTDT) & bit); 327 else 328 return !!(gpio_rcar_read(p, INDT) & bit); 329 } 330 331 static int gpio_rcar_get_multiple(struct gpio_chip *chip, unsigned long *mask, 332 unsigned long *bits) 333 { 334 struct gpio_rcar_priv *p = gpiochip_get_data(chip); 335 u32 bankmask, outputs, m, val = 0; 336 unsigned long flags; 337 338 bankmask = mask[0] & GENMASK(chip->ngpio - 1, 0); 339 if (!bankmask) 340 return 0; 341 342 if (p->info.has_always_in) { 343 bits[0] = gpio_rcar_read(p, INDT) & bankmask; 344 return 0; 345 } 346 347 raw_spin_lock_irqsave(&p->lock, flags); 348 outputs = gpio_rcar_read(p, INOUTSEL); 349 m = outputs & bankmask; 350 if (m) 351 val |= gpio_rcar_read(p, OUTDT) & m; 352 353 m = ~outputs & bankmask; 354 if (m) 355 val |= gpio_rcar_read(p, INDT) & m; 356 raw_spin_unlock_irqrestore(&p->lock, flags); 357 358 bits[0] = val; 359 return 0; 360 } 361 362 static void gpio_rcar_set(struct gpio_chip *chip, unsigned offset, int value) 363 { 364 struct gpio_rcar_priv *p = gpiochip_get_data(chip); 365 unsigned long flags; 366 367 raw_spin_lock_irqsave(&p->lock, flags); 368 gpio_rcar_modify_bit(p, OUTDT, offset, value); 369 raw_spin_unlock_irqrestore(&p->lock, flags); 370 } 371 372 static void gpio_rcar_set_multiple(struct gpio_chip *chip, unsigned long *mask, 373 unsigned long *bits) 374 { 375 struct gpio_rcar_priv *p = gpiochip_get_data(chip); 376 unsigned long flags; 377 u32 val, bankmask; 378 379 bankmask = mask[0] & GENMASK(chip->ngpio - 1, 0); 380 if (!bankmask) 381 return; 382 383 raw_spin_lock_irqsave(&p->lock, flags); 384 val = gpio_rcar_read(p, OUTDT); 385 val &= ~bankmask; 386 val |= (bankmask & bits[0]); 387 gpio_rcar_write(p, OUTDT, val); 388 raw_spin_unlock_irqrestore(&p->lock, flags); 389 } 390 391 static int gpio_rcar_direction_output(struct gpio_chip *chip, unsigned offset, 392 int value) 393 { 394 /* write GPIO value to output before selecting output mode of pin */ 395 gpio_rcar_set(chip, offset, value); 396 gpio_rcar_config_general_input_output_mode(chip, offset, true); 397 return 0; 398 } 399 400 static const struct gpio_rcar_info gpio_rcar_info_gen1 = { 401 .has_outdtsel = false, 402 .has_both_edge_trigger = false, 403 .has_always_in = false, 404 .has_inen = false, 405 }; 406 407 static const struct gpio_rcar_info gpio_rcar_info_gen2 = { 408 .has_outdtsel = true, 409 .has_both_edge_trigger = true, 410 .has_always_in = false, 411 .has_inen = false, 412 }; 413 414 static const struct gpio_rcar_info gpio_rcar_info_gen3 = { 415 .has_outdtsel = true, 416 .has_both_edge_trigger = true, 417 .has_always_in = true, 418 .has_inen = false, 419 }; 420 421 static const struct gpio_rcar_info gpio_rcar_info_gen4 = { 422 .has_outdtsel = true, 423 .has_both_edge_trigger = true, 424 .has_always_in = true, 425 .has_inen = true, 426 }; 427 428 static const struct of_device_id gpio_rcar_of_table[] = { 429 { 430 .compatible = "renesas,gpio-r8a779a0", 431 .data = &gpio_rcar_info_gen4, 432 }, { 433 .compatible = "renesas,rcar-gen1-gpio", 434 .data = &gpio_rcar_info_gen1, 435 }, { 436 .compatible = "renesas,rcar-gen2-gpio", 437 .data = &gpio_rcar_info_gen2, 438 }, { 439 .compatible = "renesas,rcar-gen3-gpio", 440 .data = &gpio_rcar_info_gen3, 441 }, { 442 .compatible = "renesas,rcar-gen4-gpio", 443 .data = &gpio_rcar_info_gen4, 444 }, { 445 .compatible = "renesas,gpio-rcar", 446 .data = &gpio_rcar_info_gen1, 447 }, { 448 /* Terminator */ 449 }, 450 }; 451 452 MODULE_DEVICE_TABLE(of, gpio_rcar_of_table); 453 454 static int gpio_rcar_parse_dt(struct gpio_rcar_priv *p, unsigned int *npins) 455 { 456 struct device_node *np = p->dev->of_node; 457 const struct gpio_rcar_info *info; 458 struct of_phandle_args args; 459 int ret; 460 461 info = of_device_get_match_data(p->dev); 462 p->info = *info; 463 464 ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &args); 465 if (ret) { 466 *npins = RCAR_MAX_GPIO_PER_BANK; 467 } else { 468 *npins = args.args[2]; 469 of_node_put(args.np); 470 } 471 472 if (*npins == 0 || *npins > RCAR_MAX_GPIO_PER_BANK) { 473 dev_warn(p->dev, "Invalid number of gpio lines %u, using %u\n", 474 *npins, RCAR_MAX_GPIO_PER_BANK); 475 *npins = RCAR_MAX_GPIO_PER_BANK; 476 } 477 478 return 0; 479 } 480 481 static void gpio_rcar_enable_inputs(struct gpio_rcar_priv *p) 482 { 483 u32 mask = GENMASK(p->gpio_chip.ngpio - 1, 0); 484 const unsigned long *valid_mask; 485 486 valid_mask = gpiochip_query_valid_mask(&p->gpio_chip); 487 488 /* Select "Input Enable" in INEN */ 489 if (valid_mask) 490 mask &= valid_mask[0]; 491 if (mask) 492 gpio_rcar_write(p, INEN, gpio_rcar_read(p, INEN) | mask); 493 } 494 495 static int gpio_rcar_probe(struct platform_device *pdev) 496 { 497 struct gpio_rcar_priv *p; 498 struct gpio_chip *gpio_chip; 499 struct gpio_irq_chip *girq; 500 struct device *dev = &pdev->dev; 501 const char *name = dev_name(dev); 502 unsigned int npins; 503 int ret; 504 505 p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL); 506 if (!p) 507 return -ENOMEM; 508 509 p->dev = dev; 510 raw_spin_lock_init(&p->lock); 511 512 /* Get device configuration from DT node */ 513 ret = gpio_rcar_parse_dt(p, &npins); 514 if (ret < 0) 515 return ret; 516 517 platform_set_drvdata(pdev, p); 518 519 pm_runtime_enable(dev); 520 521 ret = platform_get_irq(pdev, 0); 522 if (ret < 0) 523 goto err0; 524 p->irq_parent = ret; 525 526 p->base = devm_platform_ioremap_resource(pdev, 0); 527 if (IS_ERR(p->base)) { 528 ret = PTR_ERR(p->base); 529 goto err0; 530 } 531 532 gpio_chip = &p->gpio_chip; 533 gpio_chip->request = gpio_rcar_request; 534 gpio_chip->free = gpio_rcar_free; 535 gpio_chip->get_direction = gpio_rcar_get_direction; 536 gpio_chip->direction_input = gpio_rcar_direction_input; 537 gpio_chip->get = gpio_rcar_get; 538 gpio_chip->get_multiple = gpio_rcar_get_multiple; 539 gpio_chip->direction_output = gpio_rcar_direction_output; 540 gpio_chip->set = gpio_rcar_set; 541 gpio_chip->set_multiple = gpio_rcar_set_multiple; 542 gpio_chip->label = name; 543 gpio_chip->parent = dev; 544 gpio_chip->owner = THIS_MODULE; 545 gpio_chip->base = -1; 546 gpio_chip->ngpio = npins; 547 548 girq = &gpio_chip->irq; 549 gpio_irq_chip_set_chip(girq, &gpio_rcar_irq_chip); 550 /* This will let us handle the parent IRQ in the driver */ 551 girq->parent_handler = NULL; 552 girq->num_parents = 0; 553 girq->parents = NULL; 554 girq->default_type = IRQ_TYPE_NONE; 555 girq->handler = handle_level_irq; 556 557 ret = gpiochip_add_data(gpio_chip, p); 558 if (ret) { 559 dev_err(dev, "failed to add GPIO controller\n"); 560 goto err0; 561 } 562 563 irq_domain_set_pm_device(gpio_chip->irq.domain, dev); 564 ret = devm_request_irq(dev, p->irq_parent, gpio_rcar_irq_handler, 565 IRQF_SHARED, name, p); 566 if (ret) { 567 dev_err(dev, "failed to request IRQ\n"); 568 goto err1; 569 } 570 571 if (p->info.has_inen) { 572 pm_runtime_get_sync(dev); 573 gpio_rcar_enable_inputs(p); 574 pm_runtime_put(dev); 575 } 576 577 dev_info(dev, "driving %d GPIOs\n", npins); 578 579 return 0; 580 581 err1: 582 gpiochip_remove(gpio_chip); 583 err0: 584 pm_runtime_disable(dev); 585 return ret; 586 } 587 588 static void gpio_rcar_remove(struct platform_device *pdev) 589 { 590 struct gpio_rcar_priv *p = platform_get_drvdata(pdev); 591 592 gpiochip_remove(&p->gpio_chip); 593 594 pm_runtime_disable(&pdev->dev); 595 } 596 597 #ifdef CONFIG_PM_SLEEP 598 static int gpio_rcar_suspend(struct device *dev) 599 { 600 struct gpio_rcar_priv *p = dev_get_drvdata(dev); 601 602 p->bank_info.iointsel = gpio_rcar_read(p, IOINTSEL); 603 p->bank_info.inoutsel = gpio_rcar_read(p, INOUTSEL); 604 p->bank_info.outdt = gpio_rcar_read(p, OUTDT); 605 p->bank_info.intmsk = gpio_rcar_read(p, INTMSK); 606 p->bank_info.posneg = gpio_rcar_read(p, POSNEG); 607 p->bank_info.edglevel = gpio_rcar_read(p, EDGLEVEL); 608 if (p->info.has_both_edge_trigger) 609 p->bank_info.bothedge = gpio_rcar_read(p, BOTHEDGE); 610 611 if (atomic_read(&p->wakeup_path)) 612 device_set_wakeup_path(dev); 613 614 return 0; 615 } 616 617 static int gpio_rcar_resume(struct device *dev) 618 { 619 struct gpio_rcar_priv *p = dev_get_drvdata(dev); 620 unsigned int offset; 621 u32 mask; 622 623 for (offset = 0; offset < p->gpio_chip.ngpio; offset++) { 624 if (!gpiochip_line_is_valid(&p->gpio_chip, offset)) 625 continue; 626 627 mask = BIT(offset); 628 /* I/O pin */ 629 if (!(p->bank_info.iointsel & mask)) { 630 if (p->bank_info.inoutsel & mask) 631 gpio_rcar_direction_output( 632 &p->gpio_chip, offset, 633 !!(p->bank_info.outdt & mask)); 634 else 635 gpio_rcar_direction_input(&p->gpio_chip, 636 offset); 637 } else { 638 /* Interrupt pin */ 639 gpio_rcar_config_interrupt_input_mode( 640 p, 641 offset, 642 !(p->bank_info.posneg & mask), 643 !(p->bank_info.edglevel & mask), 644 !!(p->bank_info.bothedge & mask)); 645 646 if (p->bank_info.intmsk & mask) 647 gpio_rcar_write(p, MSKCLR, mask); 648 } 649 } 650 651 if (p->info.has_inen) 652 gpio_rcar_enable_inputs(p); 653 654 return 0; 655 } 656 #endif /* CONFIG_PM_SLEEP*/ 657 658 static SIMPLE_DEV_PM_OPS(gpio_rcar_pm_ops, gpio_rcar_suspend, gpio_rcar_resume); 659 660 static struct platform_driver gpio_rcar_device_driver = { 661 .probe = gpio_rcar_probe, 662 .remove = gpio_rcar_remove, 663 .driver = { 664 .name = "gpio_rcar", 665 .pm = &gpio_rcar_pm_ops, 666 .of_match_table = gpio_rcar_of_table, 667 } 668 }; 669 670 module_platform_driver(gpio_rcar_device_driver); 671 672 MODULE_AUTHOR("Magnus Damm"); 673 MODULE_DESCRIPTION("Renesas R-Car GPIO Driver"); 674 MODULE_LICENSE("GPL v2"); 675