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 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 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 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 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 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 (chip->valid_mask) 340 bankmask &= chip->valid_mask[0]; 341 342 if (!bankmask) 343 return 0; 344 345 if (p->info.has_always_in) { 346 bits[0] = gpio_rcar_read(p, INDT) & bankmask; 347 return 0; 348 } 349 350 spin_lock_irqsave(&p->lock, flags); 351 outputs = gpio_rcar_read(p, INOUTSEL); 352 m = outputs & bankmask; 353 if (m) 354 val |= gpio_rcar_read(p, OUTDT) & m; 355 356 m = ~outputs & bankmask; 357 if (m) 358 val |= gpio_rcar_read(p, INDT) & m; 359 spin_unlock_irqrestore(&p->lock, flags); 360 361 bits[0] = val; 362 return 0; 363 } 364 365 static void gpio_rcar_set(struct gpio_chip *chip, unsigned offset, int value) 366 { 367 struct gpio_rcar_priv *p = gpiochip_get_data(chip); 368 unsigned long flags; 369 370 spin_lock_irqsave(&p->lock, flags); 371 gpio_rcar_modify_bit(p, OUTDT, offset, value); 372 spin_unlock_irqrestore(&p->lock, flags); 373 } 374 375 static void gpio_rcar_set_multiple(struct gpio_chip *chip, unsigned long *mask, 376 unsigned long *bits) 377 { 378 struct gpio_rcar_priv *p = gpiochip_get_data(chip); 379 unsigned long flags; 380 u32 val, bankmask; 381 382 bankmask = mask[0] & GENMASK(chip->ngpio - 1, 0); 383 if (chip->valid_mask) 384 bankmask &= chip->valid_mask[0]; 385 386 if (!bankmask) 387 return; 388 389 spin_lock_irqsave(&p->lock, flags); 390 val = gpio_rcar_read(p, OUTDT); 391 val &= ~bankmask; 392 val |= (bankmask & bits[0]); 393 gpio_rcar_write(p, OUTDT, val); 394 spin_unlock_irqrestore(&p->lock, flags); 395 } 396 397 static int gpio_rcar_direction_output(struct gpio_chip *chip, unsigned offset, 398 int value) 399 { 400 /* write GPIO value to output before selecting output mode of pin */ 401 gpio_rcar_set(chip, offset, value); 402 gpio_rcar_config_general_input_output_mode(chip, offset, true); 403 return 0; 404 } 405 406 static const struct gpio_rcar_info gpio_rcar_info_gen1 = { 407 .has_outdtsel = false, 408 .has_both_edge_trigger = false, 409 .has_always_in = false, 410 .has_inen = false, 411 }; 412 413 static const struct gpio_rcar_info gpio_rcar_info_gen2 = { 414 .has_outdtsel = true, 415 .has_both_edge_trigger = true, 416 .has_always_in = false, 417 .has_inen = false, 418 }; 419 420 static const struct gpio_rcar_info gpio_rcar_info_gen3 = { 421 .has_outdtsel = true, 422 .has_both_edge_trigger = true, 423 .has_always_in = true, 424 .has_inen = false, 425 }; 426 427 static const struct gpio_rcar_info gpio_rcar_info_gen4 = { 428 .has_outdtsel = true, 429 .has_both_edge_trigger = true, 430 .has_always_in = true, 431 .has_inen = true, 432 }; 433 434 static const struct of_device_id gpio_rcar_of_table[] = { 435 { 436 .compatible = "renesas,gpio-r8a779a0", 437 .data = &gpio_rcar_info_gen4, 438 }, { 439 .compatible = "renesas,rcar-gen1-gpio", 440 .data = &gpio_rcar_info_gen1, 441 }, { 442 .compatible = "renesas,rcar-gen2-gpio", 443 .data = &gpio_rcar_info_gen2, 444 }, { 445 .compatible = "renesas,rcar-gen3-gpio", 446 .data = &gpio_rcar_info_gen3, 447 }, { 448 .compatible = "renesas,rcar-gen4-gpio", 449 .data = &gpio_rcar_info_gen4, 450 }, { 451 .compatible = "renesas,gpio-rcar", 452 .data = &gpio_rcar_info_gen1, 453 }, { 454 /* Terminator */ 455 }, 456 }; 457 458 MODULE_DEVICE_TABLE(of, gpio_rcar_of_table); 459 460 static int gpio_rcar_parse_dt(struct gpio_rcar_priv *p, unsigned int *npins) 461 { 462 struct device_node *np = p->dev->of_node; 463 const struct gpio_rcar_info *info; 464 struct of_phandle_args args; 465 int ret; 466 467 info = of_device_get_match_data(p->dev); 468 p->info = *info; 469 470 ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &args); 471 *npins = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK; 472 473 if (*npins == 0 || *npins > RCAR_MAX_GPIO_PER_BANK) { 474 dev_warn(p->dev, "Invalid number of gpio lines %u, using %u\n", 475 *npins, RCAR_MAX_GPIO_PER_BANK); 476 *npins = RCAR_MAX_GPIO_PER_BANK; 477 } 478 479 return 0; 480 } 481 482 static void gpio_rcar_enable_inputs(struct gpio_rcar_priv *p) 483 { 484 u32 mask = GENMASK(p->gpio_chip.ngpio - 1, 0); 485 486 /* Select "Input Enable" in INEN */ 487 if (p->gpio_chip.valid_mask) 488 mask &= p->gpio_chip.valid_mask[0]; 489 if (mask) 490 gpio_rcar_write(p, INEN, gpio_rcar_read(p, INEN) | mask); 491 } 492 493 static int gpio_rcar_probe(struct platform_device *pdev) 494 { 495 struct gpio_rcar_priv *p; 496 struct gpio_chip *gpio_chip; 497 struct gpio_irq_chip *girq; 498 struct device *dev = &pdev->dev; 499 const char *name = dev_name(dev); 500 unsigned int npins; 501 int ret; 502 503 p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL); 504 if (!p) 505 return -ENOMEM; 506 507 p->dev = dev; 508 spin_lock_init(&p->lock); 509 510 /* Get device configuration from DT node */ 511 ret = gpio_rcar_parse_dt(p, &npins); 512 if (ret < 0) 513 return ret; 514 515 platform_set_drvdata(pdev, p); 516 517 pm_runtime_enable(dev); 518 519 ret = platform_get_irq(pdev, 0); 520 if (ret < 0) 521 goto err0; 522 p->irq_parent = ret; 523 524 p->base = devm_platform_ioremap_resource(pdev, 0); 525 if (IS_ERR(p->base)) { 526 ret = PTR_ERR(p->base); 527 goto err0; 528 } 529 530 gpio_chip = &p->gpio_chip; 531 gpio_chip->request = gpio_rcar_request; 532 gpio_chip->free = gpio_rcar_free; 533 gpio_chip->get_direction = gpio_rcar_get_direction; 534 gpio_chip->direction_input = gpio_rcar_direction_input; 535 gpio_chip->get = gpio_rcar_get; 536 gpio_chip->get_multiple = gpio_rcar_get_multiple; 537 gpio_chip->direction_output = gpio_rcar_direction_output; 538 gpio_chip->set = gpio_rcar_set; 539 gpio_chip->set_multiple = gpio_rcar_set_multiple; 540 gpio_chip->label = name; 541 gpio_chip->parent = dev; 542 gpio_chip->owner = THIS_MODULE; 543 gpio_chip->base = -1; 544 gpio_chip->ngpio = npins; 545 546 girq = &gpio_chip->irq; 547 gpio_irq_chip_set_chip(girq, &gpio_rcar_irq_chip); 548 /* This will let us handle the parent IRQ in the driver */ 549 girq->parent_handler = NULL; 550 girq->num_parents = 0; 551 girq->parents = NULL; 552 girq->default_type = IRQ_TYPE_NONE; 553 girq->handler = handle_level_irq; 554 555 ret = gpiochip_add_data(gpio_chip, p); 556 if (ret) { 557 dev_err(dev, "failed to add GPIO controller\n"); 558 goto err0; 559 } 560 561 irq_domain_set_pm_device(gpio_chip->irq.domain, dev); 562 ret = devm_request_irq(dev, p->irq_parent, gpio_rcar_irq_handler, 563 IRQF_SHARED, name, p); 564 if (ret) { 565 dev_err(dev, "failed to request IRQ\n"); 566 goto err1; 567 } 568 569 if (p->info.has_inen) { 570 pm_runtime_get_sync(dev); 571 gpio_rcar_enable_inputs(p); 572 pm_runtime_put(dev); 573 } 574 575 dev_info(dev, "driving %d GPIOs\n", npins); 576 577 return 0; 578 579 err1: 580 gpiochip_remove(gpio_chip); 581 err0: 582 pm_runtime_disable(dev); 583 return ret; 584 } 585 586 static void gpio_rcar_remove(struct platform_device *pdev) 587 { 588 struct gpio_rcar_priv *p = platform_get_drvdata(pdev); 589 590 gpiochip_remove(&p->gpio_chip); 591 592 pm_runtime_disable(&pdev->dev); 593 } 594 595 #ifdef CONFIG_PM_SLEEP 596 static int gpio_rcar_suspend(struct device *dev) 597 { 598 struct gpio_rcar_priv *p = dev_get_drvdata(dev); 599 600 p->bank_info.iointsel = gpio_rcar_read(p, IOINTSEL); 601 p->bank_info.inoutsel = gpio_rcar_read(p, INOUTSEL); 602 p->bank_info.outdt = gpio_rcar_read(p, OUTDT); 603 p->bank_info.intmsk = gpio_rcar_read(p, INTMSK); 604 p->bank_info.posneg = gpio_rcar_read(p, POSNEG); 605 p->bank_info.edglevel = gpio_rcar_read(p, EDGLEVEL); 606 if (p->info.has_both_edge_trigger) 607 p->bank_info.bothedge = gpio_rcar_read(p, BOTHEDGE); 608 609 if (atomic_read(&p->wakeup_path)) 610 device_set_wakeup_path(dev); 611 612 return 0; 613 } 614 615 static int gpio_rcar_resume(struct device *dev) 616 { 617 struct gpio_rcar_priv *p = dev_get_drvdata(dev); 618 unsigned int offset; 619 u32 mask; 620 621 for (offset = 0; offset < p->gpio_chip.ngpio; offset++) { 622 if (!gpiochip_line_is_valid(&p->gpio_chip, offset)) 623 continue; 624 625 mask = BIT(offset); 626 /* I/O pin */ 627 if (!(p->bank_info.iointsel & mask)) { 628 if (p->bank_info.inoutsel & mask) 629 gpio_rcar_direction_output( 630 &p->gpio_chip, offset, 631 !!(p->bank_info.outdt & mask)); 632 else 633 gpio_rcar_direction_input(&p->gpio_chip, 634 offset); 635 } else { 636 /* Interrupt pin */ 637 gpio_rcar_config_interrupt_input_mode( 638 p, 639 offset, 640 !(p->bank_info.posneg & mask), 641 !(p->bank_info.edglevel & mask), 642 !!(p->bank_info.bothedge & mask)); 643 644 if (p->bank_info.intmsk & mask) 645 gpio_rcar_write(p, MSKCLR, mask); 646 } 647 } 648 649 if (p->info.has_inen) 650 gpio_rcar_enable_inputs(p); 651 652 return 0; 653 } 654 #endif /* CONFIG_PM_SLEEP*/ 655 656 static SIMPLE_DEV_PM_OPS(gpio_rcar_pm_ops, gpio_rcar_suspend, gpio_rcar_resume); 657 658 static struct platform_driver gpio_rcar_device_driver = { 659 .probe = gpio_rcar_probe, 660 .remove = gpio_rcar_remove, 661 .driver = { 662 .name = "gpio_rcar", 663 .pm = &gpio_rcar_pm_ops, 664 .of_match_table = gpio_rcar_of_table, 665 } 666 }; 667 668 module_platform_driver(gpio_rcar_device_driver); 669 670 MODULE_AUTHOR("Magnus Damm"); 671 MODULE_DESCRIPTION("Renesas R-Car GPIO Driver"); 672 MODULE_LICENSE("GPL v2"); 673