1 /* 2 * phy-core.c -- Generic Phy framework. 3 * 4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com 5 * 6 * Author: Kishon Vijay Abraham I <kishon@ti.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/export.h> 16 #include <linux/module.h> 17 #include <linux/err.h> 18 #include <linux/device.h> 19 #include <linux/slab.h> 20 #include <linux/of.h> 21 #include <linux/phy/phy.h> 22 #include <linux/idr.h> 23 #include <linux/pm_runtime.h> 24 25 static struct class *phy_class; 26 static DEFINE_MUTEX(phy_provider_mutex); 27 static LIST_HEAD(phy_provider_list); 28 static DEFINE_IDA(phy_ida); 29 30 static void devm_phy_release(struct device *dev, void *res) 31 { 32 struct phy *phy = *(struct phy **)res; 33 34 phy_put(phy); 35 } 36 37 static void devm_phy_provider_release(struct device *dev, void *res) 38 { 39 struct phy_provider *phy_provider = *(struct phy_provider **)res; 40 41 of_phy_provider_unregister(phy_provider); 42 } 43 44 static void devm_phy_consume(struct device *dev, void *res) 45 { 46 struct phy *phy = *(struct phy **)res; 47 48 phy_destroy(phy); 49 } 50 51 static int devm_phy_match(struct device *dev, void *res, void *match_data) 52 { 53 return res == match_data; 54 } 55 56 static struct phy *phy_lookup(struct device *device, const char *port) 57 { 58 unsigned int count; 59 struct phy *phy; 60 struct device *dev; 61 struct phy_consumer *consumers; 62 struct class_dev_iter iter; 63 64 class_dev_iter_init(&iter, phy_class, NULL, NULL); 65 while ((dev = class_dev_iter_next(&iter))) { 66 phy = to_phy(dev); 67 68 if (!phy->init_data) 69 continue; 70 count = phy->init_data->num_consumers; 71 consumers = phy->init_data->consumers; 72 while (count--) { 73 if (!strcmp(consumers->dev_name, dev_name(device)) && 74 !strcmp(consumers->port, port)) { 75 class_dev_iter_exit(&iter); 76 return phy; 77 } 78 consumers++; 79 } 80 } 81 82 class_dev_iter_exit(&iter); 83 return ERR_PTR(-ENODEV); 84 } 85 86 static struct phy_provider *of_phy_provider_lookup(struct device_node *node) 87 { 88 struct phy_provider *phy_provider; 89 90 list_for_each_entry(phy_provider, &phy_provider_list, list) { 91 if (phy_provider->dev->of_node == node) 92 return phy_provider; 93 } 94 95 return ERR_PTR(-EPROBE_DEFER); 96 } 97 98 int phy_pm_runtime_get(struct phy *phy) 99 { 100 int ret; 101 102 if (!pm_runtime_enabled(&phy->dev)) 103 return -ENOTSUPP; 104 105 ret = pm_runtime_get(&phy->dev); 106 if (ret < 0 && ret != -EINPROGRESS) 107 pm_runtime_put_noidle(&phy->dev); 108 109 return ret; 110 } 111 EXPORT_SYMBOL_GPL(phy_pm_runtime_get); 112 113 int phy_pm_runtime_get_sync(struct phy *phy) 114 { 115 int ret; 116 117 if (!pm_runtime_enabled(&phy->dev)) 118 return -ENOTSUPP; 119 120 ret = pm_runtime_get_sync(&phy->dev); 121 if (ret < 0) 122 pm_runtime_put_sync(&phy->dev); 123 124 return ret; 125 } 126 EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync); 127 128 int phy_pm_runtime_put(struct phy *phy) 129 { 130 if (!pm_runtime_enabled(&phy->dev)) 131 return -ENOTSUPP; 132 133 return pm_runtime_put(&phy->dev); 134 } 135 EXPORT_SYMBOL_GPL(phy_pm_runtime_put); 136 137 int phy_pm_runtime_put_sync(struct phy *phy) 138 { 139 if (!pm_runtime_enabled(&phy->dev)) 140 return -ENOTSUPP; 141 142 return pm_runtime_put_sync(&phy->dev); 143 } 144 EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync); 145 146 void phy_pm_runtime_allow(struct phy *phy) 147 { 148 if (!pm_runtime_enabled(&phy->dev)) 149 return; 150 151 pm_runtime_allow(&phy->dev); 152 } 153 EXPORT_SYMBOL_GPL(phy_pm_runtime_allow); 154 155 void phy_pm_runtime_forbid(struct phy *phy) 156 { 157 if (!pm_runtime_enabled(&phy->dev)) 158 return; 159 160 pm_runtime_forbid(&phy->dev); 161 } 162 EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid); 163 164 int phy_init(struct phy *phy) 165 { 166 int ret; 167 168 if (!phy) 169 return 0; 170 171 ret = phy_pm_runtime_get_sync(phy); 172 if (ret < 0 && ret != -ENOTSUPP) 173 return ret; 174 175 mutex_lock(&phy->mutex); 176 if (phy->init_count == 0 && phy->ops->init) { 177 ret = phy->ops->init(phy); 178 if (ret < 0) { 179 dev_err(&phy->dev, "phy init failed --> %d\n", ret); 180 goto out; 181 } 182 } else { 183 ret = 0; /* Override possible ret == -ENOTSUPP */ 184 } 185 ++phy->init_count; 186 187 out: 188 mutex_unlock(&phy->mutex); 189 phy_pm_runtime_put(phy); 190 return ret; 191 } 192 EXPORT_SYMBOL_GPL(phy_init); 193 194 int phy_exit(struct phy *phy) 195 { 196 int ret; 197 198 if (!phy) 199 return 0; 200 201 ret = phy_pm_runtime_get_sync(phy); 202 if (ret < 0 && ret != -ENOTSUPP) 203 return ret; 204 205 mutex_lock(&phy->mutex); 206 if (phy->init_count == 1 && phy->ops->exit) { 207 ret = phy->ops->exit(phy); 208 if (ret < 0) { 209 dev_err(&phy->dev, "phy exit failed --> %d\n", ret); 210 goto out; 211 } 212 } 213 --phy->init_count; 214 215 out: 216 mutex_unlock(&phy->mutex); 217 phy_pm_runtime_put(phy); 218 return ret; 219 } 220 EXPORT_SYMBOL_GPL(phy_exit); 221 222 int phy_power_on(struct phy *phy) 223 { 224 int ret; 225 226 if (!phy) 227 return 0; 228 229 ret = phy_pm_runtime_get_sync(phy); 230 if (ret < 0 && ret != -ENOTSUPP) 231 return ret; 232 233 mutex_lock(&phy->mutex); 234 if (phy->power_count == 0 && phy->ops->power_on) { 235 ret = phy->ops->power_on(phy); 236 if (ret < 0) { 237 dev_err(&phy->dev, "phy poweron failed --> %d\n", ret); 238 goto out; 239 } 240 } else { 241 ret = 0; /* Override possible ret == -ENOTSUPP */ 242 } 243 ++phy->power_count; 244 mutex_unlock(&phy->mutex); 245 return 0; 246 247 out: 248 mutex_unlock(&phy->mutex); 249 phy_pm_runtime_put_sync(phy); 250 251 return ret; 252 } 253 EXPORT_SYMBOL_GPL(phy_power_on); 254 255 int phy_power_off(struct phy *phy) 256 { 257 int ret; 258 259 if (!phy) 260 return 0; 261 262 mutex_lock(&phy->mutex); 263 if (phy->power_count == 1 && phy->ops->power_off) { 264 ret = phy->ops->power_off(phy); 265 if (ret < 0) { 266 dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret); 267 mutex_unlock(&phy->mutex); 268 return ret; 269 } 270 } 271 --phy->power_count; 272 mutex_unlock(&phy->mutex); 273 phy_pm_runtime_put(phy); 274 275 return 0; 276 } 277 EXPORT_SYMBOL_GPL(phy_power_off); 278 279 /** 280 * _of_phy_get() - lookup and obtain a reference to a phy by phandle 281 * @np: device_node for which to get the phy 282 * @index: the index of the phy 283 * 284 * Returns the phy associated with the given phandle value, 285 * after getting a refcount to it or -ENODEV if there is no such phy or 286 * -EPROBE_DEFER if there is a phandle to the phy, but the device is 287 * not yet loaded. This function uses of_xlate call back function provided 288 * while registering the phy_provider to find the phy instance. 289 */ 290 static struct phy *_of_phy_get(struct device_node *np, int index) 291 { 292 int ret; 293 struct phy_provider *phy_provider; 294 struct phy *phy = NULL; 295 struct of_phandle_args args; 296 297 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells", 298 index, &args); 299 if (ret) 300 return ERR_PTR(-ENODEV); 301 302 mutex_lock(&phy_provider_mutex); 303 phy_provider = of_phy_provider_lookup(args.np); 304 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) { 305 phy = ERR_PTR(-EPROBE_DEFER); 306 goto err0; 307 } 308 309 phy = phy_provider->of_xlate(phy_provider->dev, &args); 310 module_put(phy_provider->owner); 311 312 err0: 313 mutex_unlock(&phy_provider_mutex); 314 of_node_put(args.np); 315 316 return phy; 317 } 318 319 /** 320 * of_phy_get() - lookup and obtain a reference to a phy using a device_node. 321 * @np: device_node for which to get the phy 322 * @con_id: name of the phy from device's point of view 323 * 324 * Returns the phy driver, after getting a refcount to it; or 325 * -ENODEV if there is no such phy. The caller is responsible for 326 * calling phy_put() to release that count. 327 */ 328 struct phy *of_phy_get(struct device_node *np, const char *con_id) 329 { 330 struct phy *phy = NULL; 331 int index = 0; 332 333 if (con_id) 334 index = of_property_match_string(np, "phy-names", con_id); 335 336 phy = _of_phy_get(np, index); 337 if (IS_ERR(phy)) 338 return phy; 339 340 if (!try_module_get(phy->ops->owner)) 341 return ERR_PTR(-EPROBE_DEFER); 342 343 get_device(&phy->dev); 344 345 return phy; 346 } 347 EXPORT_SYMBOL_GPL(of_phy_get); 348 349 /** 350 * phy_put() - release the PHY 351 * @phy: the phy returned by phy_get() 352 * 353 * Releases a refcount the caller received from phy_get(). 354 */ 355 void phy_put(struct phy *phy) 356 { 357 if (!phy || IS_ERR(phy)) 358 return; 359 360 module_put(phy->ops->owner); 361 put_device(&phy->dev); 362 } 363 EXPORT_SYMBOL_GPL(phy_put); 364 365 /** 366 * devm_phy_put() - release the PHY 367 * @dev: device that wants to release this phy 368 * @phy: the phy returned by devm_phy_get() 369 * 370 * destroys the devres associated with this phy and invokes phy_put 371 * to release the phy. 372 */ 373 void devm_phy_put(struct device *dev, struct phy *phy) 374 { 375 int r; 376 377 if (!phy) 378 return; 379 380 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy); 381 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); 382 } 383 EXPORT_SYMBOL_GPL(devm_phy_put); 384 385 /** 386 * of_phy_simple_xlate() - returns the phy instance from phy provider 387 * @dev: the PHY provider device 388 * @args: of_phandle_args (not used here) 389 * 390 * Intended to be used by phy provider for the common case where #phy-cells is 391 * 0. For other cases where #phy-cells is greater than '0', the phy provider 392 * should provide a custom of_xlate function that reads the *args* and returns 393 * the appropriate phy. 394 */ 395 struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args 396 *args) 397 { 398 struct phy *phy; 399 struct class_dev_iter iter; 400 struct device_node *node = dev->of_node; 401 402 class_dev_iter_init(&iter, phy_class, NULL, NULL); 403 while ((dev = class_dev_iter_next(&iter))) { 404 phy = to_phy(dev); 405 if (node != phy->dev.of_node) 406 continue; 407 408 class_dev_iter_exit(&iter); 409 return phy; 410 } 411 412 class_dev_iter_exit(&iter); 413 return ERR_PTR(-ENODEV); 414 } 415 EXPORT_SYMBOL_GPL(of_phy_simple_xlate); 416 417 /** 418 * phy_get() - lookup and obtain a reference to a phy. 419 * @dev: device that requests this phy 420 * @string: the phy name as given in the dt data or the name of the controller 421 * port for non-dt case 422 * 423 * Returns the phy driver, after getting a refcount to it; or 424 * -ENODEV if there is no such phy. The caller is responsible for 425 * calling phy_put() to release that count. 426 */ 427 struct phy *phy_get(struct device *dev, const char *string) 428 { 429 int index = 0; 430 struct phy *phy; 431 432 if (string == NULL) { 433 dev_WARN(dev, "missing string\n"); 434 return ERR_PTR(-EINVAL); 435 } 436 437 if (dev->of_node) { 438 index = of_property_match_string(dev->of_node, "phy-names", 439 string); 440 phy = _of_phy_get(dev->of_node, index); 441 } else { 442 phy = phy_lookup(dev, string); 443 } 444 if (IS_ERR(phy)) 445 return phy; 446 447 if (!try_module_get(phy->ops->owner)) 448 return ERR_PTR(-EPROBE_DEFER); 449 450 get_device(&phy->dev); 451 452 return phy; 453 } 454 EXPORT_SYMBOL_GPL(phy_get); 455 456 /** 457 * phy_optional_get() - lookup and obtain a reference to an optional phy. 458 * @dev: device that requests this phy 459 * @string: the phy name as given in the dt data or the name of the controller 460 * port for non-dt case 461 * 462 * Returns the phy driver, after getting a refcount to it; or 463 * NULL if there is no such phy. The caller is responsible for 464 * calling phy_put() to release that count. 465 */ 466 struct phy *phy_optional_get(struct device *dev, const char *string) 467 { 468 struct phy *phy = phy_get(dev, string); 469 470 if (PTR_ERR(phy) == -ENODEV) 471 phy = NULL; 472 473 return phy; 474 } 475 EXPORT_SYMBOL_GPL(phy_optional_get); 476 477 /** 478 * devm_phy_get() - lookup and obtain a reference to a phy. 479 * @dev: device that requests this phy 480 * @string: the phy name as given in the dt data or phy device name 481 * for non-dt case 482 * 483 * Gets the phy using phy_get(), and associates a device with it using 484 * devres. On driver detach, release function is invoked on the devres data, 485 * then, devres data is freed. 486 */ 487 struct phy *devm_phy_get(struct device *dev, const char *string) 488 { 489 struct phy **ptr, *phy; 490 491 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL); 492 if (!ptr) 493 return ERR_PTR(-ENOMEM); 494 495 phy = phy_get(dev, string); 496 if (!IS_ERR(phy)) { 497 *ptr = phy; 498 devres_add(dev, ptr); 499 } else { 500 devres_free(ptr); 501 } 502 503 return phy; 504 } 505 EXPORT_SYMBOL_GPL(devm_phy_get); 506 507 /** 508 * devm_phy_optional_get() - lookup and obtain a reference to an optional phy. 509 * @dev: device that requests this phy 510 * @string: the phy name as given in the dt data or phy device name 511 * for non-dt case 512 * 513 * Gets the phy using phy_get(), and associates a device with it using 514 * devres. On driver detach, release function is invoked on the devres 515 * data, then, devres data is freed. This differs to devm_phy_get() in 516 * that if the phy does not exist, it is not considered an error and 517 * -ENODEV will not be returned. Instead the NULL phy is returned, 518 * which can be passed to all other phy consumer calls. 519 */ 520 struct phy *devm_phy_optional_get(struct device *dev, const char *string) 521 { 522 struct phy *phy = devm_phy_get(dev, string); 523 524 if (PTR_ERR(phy) == -ENODEV) 525 phy = NULL; 526 527 return phy; 528 } 529 EXPORT_SYMBOL_GPL(devm_phy_optional_get); 530 531 /** 532 * devm_of_phy_get() - lookup and obtain a reference to a phy. 533 * @dev: device that requests this phy 534 * @np: node containing the phy 535 * @con_id: name of the phy from device's point of view 536 * 537 * Gets the phy using of_phy_get(), and associates a device with it using 538 * devres. On driver detach, release function is invoked on the devres data, 539 * then, devres data is freed. 540 */ 541 struct phy *devm_of_phy_get(struct device *dev, struct device_node *np, 542 const char *con_id) 543 { 544 struct phy **ptr, *phy; 545 546 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL); 547 if (!ptr) 548 return ERR_PTR(-ENOMEM); 549 550 phy = of_phy_get(np, con_id); 551 if (!IS_ERR(phy)) { 552 *ptr = phy; 553 devres_add(dev, ptr); 554 } else { 555 devres_free(ptr); 556 } 557 558 return phy; 559 } 560 EXPORT_SYMBOL_GPL(devm_of_phy_get); 561 562 /** 563 * phy_create() - create a new phy 564 * @dev: device that is creating the new phy 565 * @ops: function pointers for performing phy operations 566 * @init_data: contains the list of PHY consumers or NULL 567 * 568 * Called to create a phy using phy framework. 569 */ 570 struct phy *phy_create(struct device *dev, const struct phy_ops *ops, 571 struct phy_init_data *init_data) 572 { 573 int ret; 574 int id; 575 struct phy *phy; 576 577 if (WARN_ON(!dev)) 578 return ERR_PTR(-EINVAL); 579 580 phy = kzalloc(sizeof(*phy), GFP_KERNEL); 581 if (!phy) 582 return ERR_PTR(-ENOMEM); 583 584 id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL); 585 if (id < 0) { 586 dev_err(dev, "unable to get id\n"); 587 ret = id; 588 goto free_phy; 589 } 590 591 device_initialize(&phy->dev); 592 mutex_init(&phy->mutex); 593 594 phy->dev.class = phy_class; 595 phy->dev.parent = dev; 596 phy->dev.of_node = dev->of_node; 597 phy->id = id; 598 phy->ops = ops; 599 phy->init_data = init_data; 600 601 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id); 602 if (ret) 603 goto put_dev; 604 605 ret = device_add(&phy->dev); 606 if (ret) 607 goto put_dev; 608 609 if (pm_runtime_enabled(dev)) { 610 pm_runtime_enable(&phy->dev); 611 pm_runtime_no_callbacks(&phy->dev); 612 } 613 614 return phy; 615 616 put_dev: 617 put_device(&phy->dev); 618 ida_remove(&phy_ida, phy->id); 619 free_phy: 620 kfree(phy); 621 return ERR_PTR(ret); 622 } 623 EXPORT_SYMBOL_GPL(phy_create); 624 625 /** 626 * devm_phy_create() - create a new phy 627 * @dev: device that is creating the new phy 628 * @ops: function pointers for performing phy operations 629 * @init_data: contains the list of PHY consumers or NULL 630 * 631 * Creates a new PHY device adding it to the PHY class. 632 * While at that, it also associates the device with the phy using devres. 633 * On driver detach, release function is invoked on the devres data, 634 * then, devres data is freed. 635 */ 636 struct phy *devm_phy_create(struct device *dev, const struct phy_ops *ops, 637 struct phy_init_data *init_data) 638 { 639 struct phy **ptr, *phy; 640 641 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL); 642 if (!ptr) 643 return ERR_PTR(-ENOMEM); 644 645 phy = phy_create(dev, ops, init_data); 646 if (!IS_ERR(phy)) { 647 *ptr = phy; 648 devres_add(dev, ptr); 649 } else { 650 devres_free(ptr); 651 } 652 653 return phy; 654 } 655 EXPORT_SYMBOL_GPL(devm_phy_create); 656 657 /** 658 * phy_destroy() - destroy the phy 659 * @phy: the phy to be destroyed 660 * 661 * Called to destroy the phy. 662 */ 663 void phy_destroy(struct phy *phy) 664 { 665 pm_runtime_disable(&phy->dev); 666 device_unregister(&phy->dev); 667 } 668 EXPORT_SYMBOL_GPL(phy_destroy); 669 670 /** 671 * devm_phy_destroy() - destroy the PHY 672 * @dev: device that wants to release this phy 673 * @phy: the phy returned by devm_phy_get() 674 * 675 * destroys the devres associated with this phy and invokes phy_destroy 676 * to destroy the phy. 677 */ 678 void devm_phy_destroy(struct device *dev, struct phy *phy) 679 { 680 int r; 681 682 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy); 683 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); 684 } 685 EXPORT_SYMBOL_GPL(devm_phy_destroy); 686 687 /** 688 * __of_phy_provider_register() - create/register phy provider with the framework 689 * @dev: struct device of the phy provider 690 * @owner: the module owner containing of_xlate 691 * @of_xlate: function pointer to obtain phy instance from phy provider 692 * 693 * Creates struct phy_provider from dev and of_xlate function pointer. 694 * This is used in the case of dt boot for finding the phy instance from 695 * phy provider. 696 */ 697 struct phy_provider *__of_phy_provider_register(struct device *dev, 698 struct module *owner, struct phy * (*of_xlate)(struct device *dev, 699 struct of_phandle_args *args)) 700 { 701 struct phy_provider *phy_provider; 702 703 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL); 704 if (!phy_provider) 705 return ERR_PTR(-ENOMEM); 706 707 phy_provider->dev = dev; 708 phy_provider->owner = owner; 709 phy_provider->of_xlate = of_xlate; 710 711 mutex_lock(&phy_provider_mutex); 712 list_add_tail(&phy_provider->list, &phy_provider_list); 713 mutex_unlock(&phy_provider_mutex); 714 715 return phy_provider; 716 } 717 EXPORT_SYMBOL_GPL(__of_phy_provider_register); 718 719 /** 720 * __devm_of_phy_provider_register() - create/register phy provider with the 721 * framework 722 * @dev: struct device of the phy provider 723 * @owner: the module owner containing of_xlate 724 * @of_xlate: function pointer to obtain phy instance from phy provider 725 * 726 * Creates struct phy_provider from dev and of_xlate function pointer. 727 * This is used in the case of dt boot for finding the phy instance from 728 * phy provider. While at that, it also associates the device with the 729 * phy provider using devres. On driver detach, release function is invoked 730 * on the devres data, then, devres data is freed. 731 */ 732 struct phy_provider *__devm_of_phy_provider_register(struct device *dev, 733 struct module *owner, struct phy * (*of_xlate)(struct device *dev, 734 struct of_phandle_args *args)) 735 { 736 struct phy_provider **ptr, *phy_provider; 737 738 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL); 739 if (!ptr) 740 return ERR_PTR(-ENOMEM); 741 742 phy_provider = __of_phy_provider_register(dev, owner, of_xlate); 743 if (!IS_ERR(phy_provider)) { 744 *ptr = phy_provider; 745 devres_add(dev, ptr); 746 } else { 747 devres_free(ptr); 748 } 749 750 return phy_provider; 751 } 752 EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register); 753 754 /** 755 * of_phy_provider_unregister() - unregister phy provider from the framework 756 * @phy_provider: phy provider returned by of_phy_provider_register() 757 * 758 * Removes the phy_provider created using of_phy_provider_register(). 759 */ 760 void of_phy_provider_unregister(struct phy_provider *phy_provider) 761 { 762 if (IS_ERR(phy_provider)) 763 return; 764 765 mutex_lock(&phy_provider_mutex); 766 list_del(&phy_provider->list); 767 kfree(phy_provider); 768 mutex_unlock(&phy_provider_mutex); 769 } 770 EXPORT_SYMBOL_GPL(of_phy_provider_unregister); 771 772 /** 773 * devm_of_phy_provider_unregister() - remove phy provider from the framework 774 * @dev: struct device of the phy provider 775 * 776 * destroys the devres associated with this phy provider and invokes 777 * of_phy_provider_unregister to unregister the phy provider. 778 */ 779 void devm_of_phy_provider_unregister(struct device *dev, 780 struct phy_provider *phy_provider) { 781 int r; 782 783 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match, 784 phy_provider); 785 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n"); 786 } 787 EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister); 788 789 /** 790 * phy_release() - release the phy 791 * @dev: the dev member within phy 792 * 793 * When the last reference to the device is removed, it is called 794 * from the embedded kobject as release method. 795 */ 796 static void phy_release(struct device *dev) 797 { 798 struct phy *phy; 799 800 phy = to_phy(dev); 801 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev)); 802 ida_remove(&phy_ida, phy->id); 803 kfree(phy); 804 } 805 806 static int __init phy_core_init(void) 807 { 808 phy_class = class_create(THIS_MODULE, "phy"); 809 if (IS_ERR(phy_class)) { 810 pr_err("failed to create phy class --> %ld\n", 811 PTR_ERR(phy_class)); 812 return PTR_ERR(phy_class); 813 } 814 815 phy_class->dev_release = phy_release; 816 817 return 0; 818 } 819 module_init(phy_core_init); 820 821 static void __exit phy_core_exit(void) 822 { 823 class_destroy(phy_class); 824 } 825 module_exit(phy_core_exit); 826 827 MODULE_DESCRIPTION("Generic PHY Framework"); 828 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>"); 829 MODULE_LICENSE("GPL v2"); 830