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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * phy-core.c -- Generic Phy framework.
4 *
5 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
6 *
7 * Author: Kishon Vijay Abraham I <kishon@ti.com>
8 */
9
10#include <linux/kernel.h>
11#include <linux/export.h>
12#include <linux/module.h>
13#include <linux/err.h>
14#include <linux/device.h>
15#include <linux/slab.h>
16#include <linux/of.h>
17#include <linux/phy/phy.h>
18#include <linux/idr.h>
19#include <linux/pm_runtime.h>
20#include <linux/regulator/consumer.h>
21
22static struct class *phy_class;
23static DEFINE_MUTEX(phy_provider_mutex);
24static LIST_HEAD(phy_provider_list);
25static LIST_HEAD(phys);
26static DEFINE_IDA(phy_ida);
27
28static void devm_phy_release(struct device *dev, void *res)
29{
30 struct phy *phy = *(struct phy **)res;
31
32 phy_put(dev, phy);
33}
34
35static void devm_phy_provider_release(struct device *dev, void *res)
36{
37 struct phy_provider *phy_provider = *(struct phy_provider **)res;
38
39 of_phy_provider_unregister(phy_provider);
40}
41
42static void devm_phy_consume(struct device *dev, void *res)
43{
44 struct phy *phy = *(struct phy **)res;
45
46 phy_destroy(phy);
47}
48
49static int devm_phy_match(struct device *dev, void *res, void *match_data)
50{
51 struct phy **phy = res;
52
53 return *phy == match_data;
54}
55
56/**
57 * phy_create_lookup() - allocate and register PHY/device association
58 * @phy: the phy of the association
59 * @con_id: connection ID string on device
60 * @dev_id: the device of the association
61 *
62 * Creates and registers phy_lookup entry.
63 */
64int phy_create_lookup(struct phy *phy, const char *con_id, const char *dev_id)
65{
66 struct phy_lookup *pl;
67
68 if (!phy || !dev_id || !con_id)
69 return -EINVAL;
70
71 pl = kzalloc(sizeof(*pl), GFP_KERNEL);
72 if (!pl)
73 return -ENOMEM;
74
75 pl->dev_id = dev_id;
76 pl->con_id = con_id;
77 pl->phy = phy;
78
79 mutex_lock(&phy_provider_mutex);
80 list_add_tail(&pl->node, &phys);
81 mutex_unlock(&phy_provider_mutex);
82
83 return 0;
84}
85EXPORT_SYMBOL_GPL(phy_create_lookup);
86
87/**
88 * phy_remove_lookup() - find and remove PHY/device association
89 * @phy: the phy of the association
90 * @con_id: connection ID string on device
91 * @dev_id: the device of the association
92 *
93 * Finds and unregisters phy_lookup entry that was created with
94 * phy_create_lookup().
95 */
96void phy_remove_lookup(struct phy *phy, const char *con_id, const char *dev_id)
97{
98 struct phy_lookup *pl;
99
100 if (!phy || !dev_id || !con_id)
101 return;
102
103 mutex_lock(&phy_provider_mutex);
104 list_for_each_entry(pl, &phys, node)
105 if (pl->phy == phy && !strcmp(pl->dev_id, dev_id) &&
106 !strcmp(pl->con_id, con_id)) {
107 list_del(&pl->node);
108 kfree(pl);
109 break;
110 }
111 mutex_unlock(&phy_provider_mutex);
112}
113EXPORT_SYMBOL_GPL(phy_remove_lookup);
114
115static struct phy *phy_find(struct device *dev, const char *con_id)
116{
117 const char *dev_id = dev_name(dev);
118 struct phy_lookup *p, *pl = NULL;
119
120 mutex_lock(&phy_provider_mutex);
121 list_for_each_entry(p, &phys, node)
122 if (!strcmp(p->dev_id, dev_id) && !strcmp(p->con_id, con_id)) {
123 pl = p;
124 break;
125 }
126 mutex_unlock(&phy_provider_mutex);
127
128 return pl ? pl->phy : ERR_PTR(-ENODEV);
129}
130
131static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
132{
133 struct phy_provider *phy_provider;
134 struct device_node *child;
135
136 list_for_each_entry(phy_provider, &phy_provider_list, list) {
137 if (phy_provider->dev->of_node == node)
138 return phy_provider;
139
140 for_each_child_of_node(phy_provider->children, child)
141 if (child == node)
142 return phy_provider;
143 }
144
145 return ERR_PTR(-EPROBE_DEFER);
146}
147
148int phy_pm_runtime_get(struct phy *phy)
149{
150 int ret;
151
152 if (!phy)
153 return 0;
154
155 if (!pm_runtime_enabled(&phy->dev))
156 return -ENOTSUPP;
157
158 ret = pm_runtime_get(&phy->dev);
159 if (ret < 0 && ret != -EINPROGRESS)
160 pm_runtime_put_noidle(&phy->dev);
161
162 return ret;
163}
164EXPORT_SYMBOL_GPL(phy_pm_runtime_get);
165
166int phy_pm_runtime_get_sync(struct phy *phy)
167{
168 int ret;
169
170 if (!phy)
171 return 0;
172
173 if (!pm_runtime_enabled(&phy->dev))
174 return -ENOTSUPP;
175
176 ret = pm_runtime_get_sync(&phy->dev);
177 if (ret < 0)
178 pm_runtime_put_sync(&phy->dev);
179
180 return ret;
181}
182EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync);
183
184int phy_pm_runtime_put(struct phy *phy)
185{
186 if (!phy)
187 return 0;
188
189 if (!pm_runtime_enabled(&phy->dev))
190 return -ENOTSUPP;
191
192 return pm_runtime_put(&phy->dev);
193}
194EXPORT_SYMBOL_GPL(phy_pm_runtime_put);
195
196int phy_pm_runtime_put_sync(struct phy *phy)
197{
198 if (!phy)
199 return 0;
200
201 if (!pm_runtime_enabled(&phy->dev))
202 return -ENOTSUPP;
203
204 return pm_runtime_put_sync(&phy->dev);
205}
206EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync);
207
208void phy_pm_runtime_allow(struct phy *phy)
209{
210 if (!phy)
211 return;
212
213 if (!pm_runtime_enabled(&phy->dev))
214 return;
215
216 pm_runtime_allow(&phy->dev);
217}
218EXPORT_SYMBOL_GPL(phy_pm_runtime_allow);
219
220void phy_pm_runtime_forbid(struct phy *phy)
221{
222 if (!phy)
223 return;
224
225 if (!pm_runtime_enabled(&phy->dev))
226 return;
227
228 pm_runtime_forbid(&phy->dev);
229}
230EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid);
231
232int phy_init(struct phy *phy)
233{
234 int ret;
235
236 if (!phy)
237 return 0;
238
239 ret = phy_pm_runtime_get_sync(phy);
240 if (ret < 0 && ret != -ENOTSUPP)
241 return ret;
242 ret = 0; /* Override possible ret == -ENOTSUPP */
243
244 mutex_lock(&phy->mutex);
245 if (phy->init_count == 0 && phy->ops->init) {
246 ret = phy->ops->init(phy);
247 if (ret < 0) {
248 dev_err(&phy->dev, "phy init failed --> %d\n", ret);
249 goto out;
250 }
251 }
252 ++phy->init_count;
253
254out:
255 mutex_unlock(&phy->mutex);
256 phy_pm_runtime_put(phy);
257 return ret;
258}
259EXPORT_SYMBOL_GPL(phy_init);
260
261int phy_exit(struct phy *phy)
262{
263 int ret;
264
265 if (!phy)
266 return 0;
267
268 ret = phy_pm_runtime_get_sync(phy);
269 if (ret < 0 && ret != -ENOTSUPP)
270 return ret;
271 ret = 0; /* Override possible ret == -ENOTSUPP */
272
273 mutex_lock(&phy->mutex);
274 if (phy->init_count == 1 && phy->ops->exit) {
275 ret = phy->ops->exit(phy);
276 if (ret < 0) {
277 dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
278 goto out;
279 }
280 }
281 --phy->init_count;
282
283out:
284 mutex_unlock(&phy->mutex);
285 phy_pm_runtime_put(phy);
286 return ret;
287}
288EXPORT_SYMBOL_GPL(phy_exit);
289
290int phy_power_on(struct phy *phy)
291{
292 int ret = 0;
293
294 if (!phy)
295 goto out;
296
297 if (phy->pwr) {
298 ret = regulator_enable(phy->pwr);
299 if (ret)
300 goto out;
301 }
302
303 ret = phy_pm_runtime_get_sync(phy);
304 if (ret < 0 && ret != -ENOTSUPP)
305 goto err_pm_sync;
306
307 ret = 0; /* Override possible ret == -ENOTSUPP */
308
309 mutex_lock(&phy->mutex);
310 if (phy->power_count == 0 && phy->ops->power_on) {
311 ret = phy->ops->power_on(phy);
312 if (ret < 0) {
313 dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
314 goto err_pwr_on;
315 }
316 }
317 ++phy->power_count;
318 mutex_unlock(&phy->mutex);
319 return 0;
320
321err_pwr_on:
322 mutex_unlock(&phy->mutex);
323 phy_pm_runtime_put_sync(phy);
324err_pm_sync:
325 if (phy->pwr)
326 regulator_disable(phy->pwr);
327out:
328 return ret;
329}
330EXPORT_SYMBOL_GPL(phy_power_on);
331
332int phy_power_off(struct phy *phy)
333{
334 int ret;
335
336 if (!phy)
337 return 0;
338
339 mutex_lock(&phy->mutex);
340 if (phy->power_count == 1 && phy->ops->power_off) {
341 ret = phy->ops->power_off(phy);
342 if (ret < 0) {
343 dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
344 mutex_unlock(&phy->mutex);
345 return ret;
346 }
347 }
348 --phy->power_count;
349 mutex_unlock(&phy->mutex);
350 phy_pm_runtime_put(phy);
351
352 if (phy->pwr)
353 regulator_disable(phy->pwr);
354
355 return 0;
356}
357EXPORT_SYMBOL_GPL(phy_power_off);
358
359int phy_set_mode_ext(struct phy *phy, enum phy_mode mode, int submode)
360{
361 int ret;
362
363 if (!phy || !phy->ops->set_mode)
364 return 0;
365
366 mutex_lock(&phy->mutex);
367 ret = phy->ops->set_mode(phy, mode, submode);
368 if (!ret)
369 phy->attrs.mode = mode;
370 mutex_unlock(&phy->mutex);
371
372 return ret;
373}
374EXPORT_SYMBOL_GPL(phy_set_mode_ext);
375
376int phy_reset(struct phy *phy)
377{
378 int ret;
379
380 if (!phy || !phy->ops->reset)
381 return 0;
382
383 ret = phy_pm_runtime_get_sync(phy);
384 if (ret < 0 && ret != -ENOTSUPP)
385 return ret;
386
387 mutex_lock(&phy->mutex);
388 ret = phy->ops->reset(phy);
389 mutex_unlock(&phy->mutex);
390
391 phy_pm_runtime_put(phy);
392
393 return ret;
394}
395EXPORT_SYMBOL_GPL(phy_reset);
396
397/**
398 * phy_calibrate() - Tunes the phy hw parameters for current configuration
399 * @phy: the phy returned by phy_get()
400 *
401 * Used to calibrate phy hardware, typically by adjusting some parameters in
402 * runtime, which are otherwise lost after host controller reset and cannot
403 * be applied in phy_init() or phy_power_on().
404 *
405 * Returns: 0 if successful, an negative error code otherwise
406 */
407int phy_calibrate(struct phy *phy)
408{
409 int ret;
410
411 if (!phy || !phy->ops->calibrate)
412 return 0;
413
414 mutex_lock(&phy->mutex);
415 ret = phy->ops->calibrate(phy);
416 mutex_unlock(&phy->mutex);
417
418 return ret;
419}
420EXPORT_SYMBOL_GPL(phy_calibrate);
421
422/**
423 * phy_configure() - Changes the phy parameters
424 * @phy: the phy returned by phy_get()
425 * @opts: New configuration to apply
426 *
427 * Used to change the PHY parameters. phy_init() must have been called
428 * on the phy. The configuration will be applied on the current phy
429 * mode, that can be changed using phy_set_mode().
430 *
431 * Returns: 0 if successful, an negative error code otherwise
432 */
433int phy_configure(struct phy *phy, union phy_configure_opts *opts)
434{
435 int ret;
436
437 if (!phy)
438 return -EINVAL;
439
440 if (!phy->ops->configure)
441 return -EOPNOTSUPP;
442
443 mutex_lock(&phy->mutex);
444 ret = phy->ops->configure(phy, opts);
445 mutex_unlock(&phy->mutex);
446
447 return ret;
448}
449EXPORT_SYMBOL_GPL(phy_configure);
450
451/**
452 * phy_validate() - Checks the phy parameters
453 * @phy: the phy returned by phy_get()
454 * @mode: phy_mode the configuration is applicable to.
455 * @submode: PHY submode the configuration is applicable to.
456 * @opts: Configuration to check
457 *
458 * Used to check that the current set of parameters can be handled by
459 * the phy. Implementations are free to tune the parameters passed as
460 * arguments if needed by some implementation detail or
461 * constraints. It will not change any actual configuration of the
462 * PHY, so calling it as many times as deemed fit will have no side
463 * effect.
464 *
465 * Returns: 0 if successful, an negative error code otherwise
466 */
467int phy_validate(struct phy *phy, enum phy_mode mode, int submode,
468 union phy_configure_opts *opts)
469{
470 int ret;
471
472 if (!phy)
473 return -EINVAL;
474
475 if (!phy->ops->validate)
476 return -EOPNOTSUPP;
477
478 mutex_lock(&phy->mutex);
479 ret = phy->ops->validate(phy, mode, submode, opts);
480 mutex_unlock(&phy->mutex);
481
482 return ret;
483}
484EXPORT_SYMBOL_GPL(phy_validate);
485
486/**
487 * _of_phy_get() - lookup and obtain a reference to a phy by phandle
488 * @np: device_node for which to get the phy
489 * @index: the index of the phy
490 *
491 * Returns the phy associated with the given phandle value,
492 * after getting a refcount to it or -ENODEV if there is no such phy or
493 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
494 * not yet loaded. This function uses of_xlate call back function provided
495 * while registering the phy_provider to find the phy instance.
496 */
497static struct phy *_of_phy_get(struct device_node *np, int index)
498{
499 int ret;
500 struct phy_provider *phy_provider;
501 struct phy *phy = NULL;
502 struct of_phandle_args args;
503
504 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
505 index, &args);
506 if (ret)
507 return ERR_PTR(-ENODEV);
508
509 /* This phy type handled by the usb-phy subsystem for now */
510 if (of_device_is_compatible(args.np, "usb-nop-xceiv"))
511 return ERR_PTR(-ENODEV);
512
513 mutex_lock(&phy_provider_mutex);
514 phy_provider = of_phy_provider_lookup(args.np);
515 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
516 phy = ERR_PTR(-EPROBE_DEFER);
517 goto out_unlock;
518 }
519
520 if (!of_device_is_available(args.np)) {
521 dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
522 phy = ERR_PTR(-ENODEV);
523 goto out_put_module;
524 }
525
526 phy = phy_provider->of_xlate(phy_provider->dev, &args);
527
528out_put_module:
529 module_put(phy_provider->owner);
530
531out_unlock:
532 mutex_unlock(&phy_provider_mutex);
533 of_node_put(args.np);
534
535 return phy;
536}
537
538/**
539 * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
540 * @np: device_node for which to get the phy
541 * @con_id: name of the phy from device's point of view
542 *
543 * Returns the phy driver, after getting a refcount to it; or
544 * -ENODEV if there is no such phy. The caller is responsible for
545 * calling phy_put() to release that count.
546 */
547struct phy *of_phy_get(struct device_node *np, const char *con_id)
548{
549 struct phy *phy = NULL;
550 int index = 0;
551
552 if (con_id)
553 index = of_property_match_string(np, "phy-names", con_id);
554
555 phy = _of_phy_get(np, index);
556 if (IS_ERR(phy))
557 return phy;
558
559 if (!try_module_get(phy->ops->owner))
560 return ERR_PTR(-EPROBE_DEFER);
561
562 get_device(&phy->dev);
563
564 return phy;
565}
566EXPORT_SYMBOL_GPL(of_phy_get);
567
568/**
569 * of_phy_put() - release the PHY
570 * @phy: the phy returned by of_phy_get()
571 *
572 * Releases a refcount the caller received from of_phy_get().
573 */
574void of_phy_put(struct phy *phy)
575{
576 if (!phy || IS_ERR(phy))
577 return;
578
579 mutex_lock(&phy->mutex);
580 if (phy->ops->release)
581 phy->ops->release(phy);
582 mutex_unlock(&phy->mutex);
583
584 module_put(phy->ops->owner);
585 put_device(&phy->dev);
586}
587EXPORT_SYMBOL_GPL(of_phy_put);
588
589/**
590 * phy_put() - release the PHY
591 * @dev: device that wants to release this phy
592 * @phy: the phy returned by phy_get()
593 *
594 * Releases a refcount the caller received from phy_get().
595 */
596void phy_put(struct device *dev, struct phy *phy)
597{
598 device_link_remove(dev, &phy->dev);
599 of_phy_put(phy);
600}
601EXPORT_SYMBOL_GPL(phy_put);
602
603/**
604 * devm_phy_put() - release the PHY
605 * @dev: device that wants to release this phy
606 * @phy: the phy returned by devm_phy_get()
607 *
608 * destroys the devres associated with this phy and invokes phy_put
609 * to release the phy.
610 */
611void devm_phy_put(struct device *dev, struct phy *phy)
612{
613 int r;
614
615 if (!phy)
616 return;
617
618 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
619 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
620}
621EXPORT_SYMBOL_GPL(devm_phy_put);
622
623/**
624 * of_phy_simple_xlate() - returns the phy instance from phy provider
625 * @dev: the PHY provider device
626 * @args: of_phandle_args (not used here)
627 *
628 * Intended to be used by phy provider for the common case where #phy-cells is
629 * 0. For other cases where #phy-cells is greater than '0', the phy provider
630 * should provide a custom of_xlate function that reads the *args* and returns
631 * the appropriate phy.
632 */
633struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
634 *args)
635{
636 struct phy *phy;
637 struct class_dev_iter iter;
638
639 class_dev_iter_init(&iter, phy_class, NULL, NULL);
640 while ((dev = class_dev_iter_next(&iter))) {
641 phy = to_phy(dev);
642 if (args->np != phy->dev.of_node)
643 continue;
644
645 class_dev_iter_exit(&iter);
646 return phy;
647 }
648
649 class_dev_iter_exit(&iter);
650 return ERR_PTR(-ENODEV);
651}
652EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
653
654/**
655 * phy_get() - lookup and obtain a reference to a phy.
656 * @dev: device that requests this phy
657 * @string: the phy name as given in the dt data or the name of the controller
658 * port for non-dt case
659 *
660 * Returns the phy driver, after getting a refcount to it; or
661 * -ENODEV if there is no such phy. The caller is responsible for
662 * calling phy_put() to release that count.
663 */
664struct phy *phy_get(struct device *dev, const char *string)
665{
666 int index = 0;
667 struct phy *phy;
668 struct device_link *link;
669
670 if (string == NULL) {
671 dev_WARN(dev, "missing string\n");
672 return ERR_PTR(-EINVAL);
673 }
674
675 if (dev->of_node) {
676 index = of_property_match_string(dev->of_node, "phy-names",
677 string);
678 phy = _of_phy_get(dev->of_node, index);
679 } else {
680 phy = phy_find(dev, string);
681 }
682 if (IS_ERR(phy))
683 return phy;
684
685 if (!try_module_get(phy->ops->owner))
686 return ERR_PTR(-EPROBE_DEFER);
687
688 get_device(&phy->dev);
689
690 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
691 if (!link)
692 dev_dbg(dev, "failed to create device link to %s\n",
693 dev_name(phy->dev.parent));
694
695 return phy;
696}
697EXPORT_SYMBOL_GPL(phy_get);
698
699/**
700 * phy_optional_get() - lookup and obtain a reference to an optional phy.
701 * @dev: device that requests this phy
702 * @string: the phy name as given in the dt data or the name of the controller
703 * port for non-dt case
704 *
705 * Returns the phy driver, after getting a refcount to it; or
706 * NULL if there is no such phy. The caller is responsible for
707 * calling phy_put() to release that count.
708 */
709struct phy *phy_optional_get(struct device *dev, const char *string)
710{
711 struct phy *phy = phy_get(dev, string);
712
713 if (PTR_ERR(phy) == -ENODEV)
714 phy = NULL;
715
716 return phy;
717}
718EXPORT_SYMBOL_GPL(phy_optional_get);
719
720/**
721 * devm_phy_get() - lookup and obtain a reference to a phy.
722 * @dev: device that requests this phy
723 * @string: the phy name as given in the dt data or phy device name
724 * for non-dt case
725 *
726 * Gets the phy using phy_get(), and associates a device with it using
727 * devres. On driver detach, release function is invoked on the devres data,
728 * then, devres data is freed.
729 */
730struct phy *devm_phy_get(struct device *dev, const char *string)
731{
732 struct phy **ptr, *phy;
733
734 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
735 if (!ptr)
736 return ERR_PTR(-ENOMEM);
737
738 phy = phy_get(dev, string);
739 if (!IS_ERR(phy)) {
740 *ptr = phy;
741 devres_add(dev, ptr);
742 } else {
743 devres_free(ptr);
744 }
745
746 return phy;
747}
748EXPORT_SYMBOL_GPL(devm_phy_get);
749
750/**
751 * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
752 * @dev: device that requests this phy
753 * @string: the phy name as given in the dt data or phy device name
754 * for non-dt case
755 *
756 * Gets the phy using phy_get(), and associates a device with it using
757 * devres. On driver detach, release function is invoked on the devres
758 * data, then, devres data is freed. This differs to devm_phy_get() in
759 * that if the phy does not exist, it is not considered an error and
760 * -ENODEV will not be returned. Instead the NULL phy is returned,
761 * which can be passed to all other phy consumer calls.
762 */
763struct phy *devm_phy_optional_get(struct device *dev, const char *string)
764{
765 struct phy *phy = devm_phy_get(dev, string);
766
767 if (PTR_ERR(phy) == -ENODEV)
768 phy = NULL;
769
770 return phy;
771}
772EXPORT_SYMBOL_GPL(devm_phy_optional_get);
773
774/**
775 * devm_of_phy_get() - lookup and obtain a reference to a phy.
776 * @dev: device that requests this phy
777 * @np: node containing the phy
778 * @con_id: name of the phy from device's point of view
779 *
780 * Gets the phy using of_phy_get(), and associates a device with it using
781 * devres. On driver detach, release function is invoked on the devres data,
782 * then, devres data is freed.
783 */
784struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
785 const char *con_id)
786{
787 struct phy **ptr, *phy;
788 struct device_link *link;
789
790 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
791 if (!ptr)
792 return ERR_PTR(-ENOMEM);
793
794 phy = of_phy_get(np, con_id);
795 if (!IS_ERR(phy)) {
796 *ptr = phy;
797 devres_add(dev, ptr);
798 } else {
799 devres_free(ptr);
800 return phy;
801 }
802
803 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
804 if (!link)
805 dev_dbg(dev, "failed to create device link to %s\n",
806 dev_name(phy->dev.parent));
807
808 return phy;
809}
810EXPORT_SYMBOL_GPL(devm_of_phy_get);
811
812/**
813 * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
814 * @dev: device that requests this phy
815 * @np: node containing the phy
816 * @index: index of the phy
817 *
818 * Gets the phy using _of_phy_get(), then gets a refcount to it,
819 * and associates a device with it using devres. On driver detach,
820 * release function is invoked on the devres data,
821 * then, devres data is freed.
822 *
823 */
824struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
825 int index)
826{
827 struct phy **ptr, *phy;
828 struct device_link *link;
829
830 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
831 if (!ptr)
832 return ERR_PTR(-ENOMEM);
833
834 phy = _of_phy_get(np, index);
835 if (IS_ERR(phy)) {
836 devres_free(ptr);
837 return phy;
838 }
839
840 if (!try_module_get(phy->ops->owner)) {
841 devres_free(ptr);
842 return ERR_PTR(-EPROBE_DEFER);
843 }
844
845 get_device(&phy->dev);
846
847 *ptr = phy;
848 devres_add(dev, ptr);
849
850 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
851 if (!link)
852 dev_dbg(dev, "failed to create device link to %s\n",
853 dev_name(phy->dev.parent));
854
855 return phy;
856}
857EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
858
859/**
860 * phy_create() - create a new phy
861 * @dev: device that is creating the new phy
862 * @node: device node of the phy
863 * @ops: function pointers for performing phy operations
864 *
865 * Called to create a phy using phy framework.
866 */
867struct phy *phy_create(struct device *dev, struct device_node *node,
868 const struct phy_ops *ops)
869{
870 int ret;
871 int id;
872 struct phy *phy;
873
874 if (WARN_ON(!dev))
875 return ERR_PTR(-EINVAL);
876
877 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
878 if (!phy)
879 return ERR_PTR(-ENOMEM);
880
881 id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
882 if (id < 0) {
883 dev_err(dev, "unable to get id\n");
884 ret = id;
885 goto free_phy;
886 }
887
888 device_initialize(&phy->dev);
889 mutex_init(&phy->mutex);
890
891 phy->dev.class = phy_class;
892 phy->dev.parent = dev;
893 phy->dev.of_node = node ?: dev->of_node;
894 phy->id = id;
895 phy->ops = ops;
896
897 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
898 if (ret)
899 goto put_dev;
900
901 /* phy-supply */
902 phy->pwr = regulator_get_optional(&phy->dev, "phy");
903 if (IS_ERR(phy->pwr)) {
904 ret = PTR_ERR(phy->pwr);
905 if (ret == -EPROBE_DEFER)
906 goto put_dev;
907
908 phy->pwr = NULL;
909 }
910
911 ret = device_add(&phy->dev);
912 if (ret)
913 goto put_dev;
914
915 if (pm_runtime_enabled(dev)) {
916 pm_runtime_enable(&phy->dev);
917 pm_runtime_no_callbacks(&phy->dev);
918 }
919
920 return phy;
921
922put_dev:
923 put_device(&phy->dev); /* calls phy_release() which frees resources */
924 return ERR_PTR(ret);
925
926free_phy:
927 kfree(phy);
928 return ERR_PTR(ret);
929}
930EXPORT_SYMBOL_GPL(phy_create);
931
932/**
933 * devm_phy_create() - create a new phy
934 * @dev: device that is creating the new phy
935 * @node: device node of the phy
936 * @ops: function pointers for performing phy operations
937 *
938 * Creates a new PHY device adding it to the PHY class.
939 * While at that, it also associates the device with the phy using devres.
940 * On driver detach, release function is invoked on the devres data,
941 * then, devres data is freed.
942 */
943struct phy *devm_phy_create(struct device *dev, struct device_node *node,
944 const struct phy_ops *ops)
945{
946 struct phy **ptr, *phy;
947
948 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
949 if (!ptr)
950 return ERR_PTR(-ENOMEM);
951
952 phy = phy_create(dev, node, ops);
953 if (!IS_ERR(phy)) {
954 *ptr = phy;
955 devres_add(dev, ptr);
956 } else {
957 devres_free(ptr);
958 }
959
960 return phy;
961}
962EXPORT_SYMBOL_GPL(devm_phy_create);
963
964/**
965 * phy_destroy() - destroy the phy
966 * @phy: the phy to be destroyed
967 *
968 * Called to destroy the phy.
969 */
970void phy_destroy(struct phy *phy)
971{
972 pm_runtime_disable(&phy->dev);
973 device_unregister(&phy->dev);
974}
975EXPORT_SYMBOL_GPL(phy_destroy);
976
977/**
978 * devm_phy_destroy() - destroy the PHY
979 * @dev: device that wants to release this phy
980 * @phy: the phy returned by devm_phy_get()
981 *
982 * destroys the devres associated with this phy and invokes phy_destroy
983 * to destroy the phy.
984 */
985void devm_phy_destroy(struct device *dev, struct phy *phy)
986{
987 int r;
988
989 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
990 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
991}
992EXPORT_SYMBOL_GPL(devm_phy_destroy);
993
994/**
995 * __of_phy_provider_register() - create/register phy provider with the framework
996 * @dev: struct device of the phy provider
997 * @children: device node containing children (if different from dev->of_node)
998 * @owner: the module owner containing of_xlate
999 * @of_xlate: function pointer to obtain phy instance from phy provider
1000 *
1001 * Creates struct phy_provider from dev and of_xlate function pointer.
1002 * This is used in the case of dt boot for finding the phy instance from
1003 * phy provider.
1004 *
1005 * If the PHY provider doesn't nest children directly but uses a separate
1006 * child node to contain the individual children, the @children parameter
1007 * can be used to override the default. If NULL, the default (dev->of_node)
1008 * will be used. If non-NULL, the device node must be a child (or further
1009 * descendant) of dev->of_node. Otherwise an ERR_PTR()-encoded -EINVAL
1010 * error code is returned.
1011 */
1012struct phy_provider *__of_phy_provider_register(struct device *dev,
1013 struct device_node *children, struct module *owner,
1014 struct phy * (*of_xlate)(struct device *dev,
1015 struct of_phandle_args *args))
1016{
1017 struct phy_provider *phy_provider;
1018
1019 /*
1020 * If specified, the device node containing the children must itself
1021 * be the provider's device node or a child (or further descendant)
1022 * thereof.
1023 */
1024 if (children) {
1025 struct device_node *parent = of_node_get(children), *next;
1026
1027 while (parent) {
1028 if (parent == dev->of_node)
1029 break;
1030
1031 next = of_get_parent(parent);
1032 of_node_put(parent);
1033 parent = next;
1034 }
1035
1036 if (!parent)
1037 return ERR_PTR(-EINVAL);
1038
1039 of_node_put(parent);
1040 } else {
1041 children = dev->of_node;
1042 }
1043
1044 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
1045 if (!phy_provider)
1046 return ERR_PTR(-ENOMEM);
1047
1048 phy_provider->dev = dev;
1049 phy_provider->children = of_node_get(children);
1050 phy_provider->owner = owner;
1051 phy_provider->of_xlate = of_xlate;
1052
1053 mutex_lock(&phy_provider_mutex);
1054 list_add_tail(&phy_provider->list, &phy_provider_list);
1055 mutex_unlock(&phy_provider_mutex);
1056
1057 return phy_provider;
1058}
1059EXPORT_SYMBOL_GPL(__of_phy_provider_register);
1060
1061/**
1062 * __devm_of_phy_provider_register() - create/register phy provider with the
1063 * framework
1064 * @dev: struct device of the phy provider
1065 * @children: device node containing children (if different from dev->of_node)
1066 * @owner: the module owner containing of_xlate
1067 * @of_xlate: function pointer to obtain phy instance from phy provider
1068 *
1069 * Creates struct phy_provider from dev and of_xlate function pointer.
1070 * This is used in the case of dt boot for finding the phy instance from
1071 * phy provider. While at that, it also associates the device with the
1072 * phy provider using devres. On driver detach, release function is invoked
1073 * on the devres data, then, devres data is freed.
1074 */
1075struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
1076 struct device_node *children, struct module *owner,
1077 struct phy * (*of_xlate)(struct device *dev,
1078 struct of_phandle_args *args))
1079{
1080 struct phy_provider **ptr, *phy_provider;
1081
1082 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
1083 if (!ptr)
1084 return ERR_PTR(-ENOMEM);
1085
1086 phy_provider = __of_phy_provider_register(dev, children, owner,
1087 of_xlate);
1088 if (!IS_ERR(phy_provider)) {
1089 *ptr = phy_provider;
1090 devres_add(dev, ptr);
1091 } else {
1092 devres_free(ptr);
1093 }
1094
1095 return phy_provider;
1096}
1097EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);
1098
1099/**
1100 * of_phy_provider_unregister() - unregister phy provider from the framework
1101 * @phy_provider: phy provider returned by of_phy_provider_register()
1102 *
1103 * Removes the phy_provider created using of_phy_provider_register().
1104 */
1105void of_phy_provider_unregister(struct phy_provider *phy_provider)
1106{
1107 if (IS_ERR(phy_provider))
1108 return;
1109
1110 mutex_lock(&phy_provider_mutex);
1111 list_del(&phy_provider->list);
1112 of_node_put(phy_provider->children);
1113 kfree(phy_provider);
1114 mutex_unlock(&phy_provider_mutex);
1115}
1116EXPORT_SYMBOL_GPL(of_phy_provider_unregister);
1117
1118/**
1119 * devm_of_phy_provider_unregister() - remove phy provider from the framework
1120 * @dev: struct device of the phy provider
1121 * @phy_provider: phy provider returned by of_phy_provider_register()
1122 *
1123 * destroys the devres associated with this phy provider and invokes
1124 * of_phy_provider_unregister to unregister the phy provider.
1125 */
1126void devm_of_phy_provider_unregister(struct device *dev,
1127 struct phy_provider *phy_provider)
1128{
1129 int r;
1130
1131 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
1132 phy_provider);
1133 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
1134}
1135EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
1136
1137/**
1138 * phy_release() - release the phy
1139 * @dev: the dev member within phy
1140 *
1141 * When the last reference to the device is removed, it is called
1142 * from the embedded kobject as release method.
1143 */
1144static void phy_release(struct device *dev)
1145{
1146 struct phy *phy;
1147
1148 phy = to_phy(dev);
1149 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
1150 regulator_put(phy->pwr);
1151 ida_simple_remove(&phy_ida, phy->id);
1152 kfree(phy);
1153}
1154
1155static int __init phy_core_init(void)
1156{
1157 phy_class = class_create(THIS_MODULE, "phy");
1158 if (IS_ERR(phy_class)) {
1159 pr_err("failed to create phy class --> %ld\n",
1160 PTR_ERR(phy_class));
1161 return PTR_ERR(phy_class);
1162 }
1163
1164 phy_class->dev_release = phy_release;
1165
1166 return 0;
1167}
1168device_initcall(phy_core_init);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * phy-core.c -- Generic Phy framework.
4 *
5 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
6 *
7 * Author: Kishon Vijay Abraham I <kishon@ti.com>
8 */
9
10#include <linux/kernel.h>
11#include <linux/export.h>
12#include <linux/module.h>
13#include <linux/err.h>
14#include <linux/device.h>
15#include <linux/slab.h>
16#include <linux/of.h>
17#include <linux/phy/phy.h>
18#include <linux/idr.h>
19#include <linux/pm_runtime.h>
20#include <linux/regulator/consumer.h>
21
22static struct class *phy_class;
23static DEFINE_MUTEX(phy_provider_mutex);
24static LIST_HEAD(phy_provider_list);
25static LIST_HEAD(phys);
26static DEFINE_IDA(phy_ida);
27
28static void devm_phy_release(struct device *dev, void *res)
29{
30 struct phy *phy = *(struct phy **)res;
31
32 phy_put(dev, phy);
33}
34
35static void devm_phy_provider_release(struct device *dev, void *res)
36{
37 struct phy_provider *phy_provider = *(struct phy_provider **)res;
38
39 of_phy_provider_unregister(phy_provider);
40}
41
42static void devm_phy_consume(struct device *dev, void *res)
43{
44 struct phy *phy = *(struct phy **)res;
45
46 phy_destroy(phy);
47}
48
49static int devm_phy_match(struct device *dev, void *res, void *match_data)
50{
51 struct phy **phy = res;
52
53 return *phy == match_data;
54}
55
56/**
57 * phy_create_lookup() - allocate and register PHY/device association
58 * @phy: the phy of the association
59 * @con_id: connection ID string on device
60 * @dev_id: the device of the association
61 *
62 * Creates and registers phy_lookup entry.
63 */
64int phy_create_lookup(struct phy *phy, const char *con_id, const char *dev_id)
65{
66 struct phy_lookup *pl;
67
68 if (!phy || !dev_id || !con_id)
69 return -EINVAL;
70
71 pl = kzalloc(sizeof(*pl), GFP_KERNEL);
72 if (!pl)
73 return -ENOMEM;
74
75 pl->dev_id = dev_id;
76 pl->con_id = con_id;
77 pl->phy = phy;
78
79 mutex_lock(&phy_provider_mutex);
80 list_add_tail(&pl->node, &phys);
81 mutex_unlock(&phy_provider_mutex);
82
83 return 0;
84}
85EXPORT_SYMBOL_GPL(phy_create_lookup);
86
87/**
88 * phy_remove_lookup() - find and remove PHY/device association
89 * @phy: the phy of the association
90 * @con_id: connection ID string on device
91 * @dev_id: the device of the association
92 *
93 * Finds and unregisters phy_lookup entry that was created with
94 * phy_create_lookup().
95 */
96void phy_remove_lookup(struct phy *phy, const char *con_id, const char *dev_id)
97{
98 struct phy_lookup *pl;
99
100 if (!phy || !dev_id || !con_id)
101 return;
102
103 mutex_lock(&phy_provider_mutex);
104 list_for_each_entry(pl, &phys, node)
105 if (pl->phy == phy && !strcmp(pl->dev_id, dev_id) &&
106 !strcmp(pl->con_id, con_id)) {
107 list_del(&pl->node);
108 kfree(pl);
109 break;
110 }
111 mutex_unlock(&phy_provider_mutex);
112}
113EXPORT_SYMBOL_GPL(phy_remove_lookup);
114
115static struct phy *phy_find(struct device *dev, const char *con_id)
116{
117 const char *dev_id = dev_name(dev);
118 struct phy_lookup *p, *pl = NULL;
119
120 mutex_lock(&phy_provider_mutex);
121 list_for_each_entry(p, &phys, node)
122 if (!strcmp(p->dev_id, dev_id) && !strcmp(p->con_id, con_id)) {
123 pl = p;
124 break;
125 }
126 mutex_unlock(&phy_provider_mutex);
127
128 return pl ? pl->phy : ERR_PTR(-ENODEV);
129}
130
131static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
132{
133 struct phy_provider *phy_provider;
134 struct device_node *child;
135
136 list_for_each_entry(phy_provider, &phy_provider_list, list) {
137 if (phy_provider->dev->of_node == node)
138 return phy_provider;
139
140 for_each_child_of_node(phy_provider->children, child)
141 if (child == node)
142 return phy_provider;
143 }
144
145 return ERR_PTR(-EPROBE_DEFER);
146}
147
148int phy_pm_runtime_get(struct phy *phy)
149{
150 int ret;
151
152 if (!phy)
153 return 0;
154
155 if (!pm_runtime_enabled(&phy->dev))
156 return -ENOTSUPP;
157
158 ret = pm_runtime_get(&phy->dev);
159 if (ret < 0 && ret != -EINPROGRESS)
160 pm_runtime_put_noidle(&phy->dev);
161
162 return ret;
163}
164EXPORT_SYMBOL_GPL(phy_pm_runtime_get);
165
166int phy_pm_runtime_get_sync(struct phy *phy)
167{
168 int ret;
169
170 if (!phy)
171 return 0;
172
173 if (!pm_runtime_enabled(&phy->dev))
174 return -ENOTSUPP;
175
176 ret = pm_runtime_get_sync(&phy->dev);
177 if (ret < 0)
178 pm_runtime_put_sync(&phy->dev);
179
180 return ret;
181}
182EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync);
183
184int phy_pm_runtime_put(struct phy *phy)
185{
186 if (!phy)
187 return 0;
188
189 if (!pm_runtime_enabled(&phy->dev))
190 return -ENOTSUPP;
191
192 return pm_runtime_put(&phy->dev);
193}
194EXPORT_SYMBOL_GPL(phy_pm_runtime_put);
195
196int phy_pm_runtime_put_sync(struct phy *phy)
197{
198 if (!phy)
199 return 0;
200
201 if (!pm_runtime_enabled(&phy->dev))
202 return -ENOTSUPP;
203
204 return pm_runtime_put_sync(&phy->dev);
205}
206EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync);
207
208void phy_pm_runtime_allow(struct phy *phy)
209{
210 if (!phy)
211 return;
212
213 if (!pm_runtime_enabled(&phy->dev))
214 return;
215
216 pm_runtime_allow(&phy->dev);
217}
218EXPORT_SYMBOL_GPL(phy_pm_runtime_allow);
219
220void phy_pm_runtime_forbid(struct phy *phy)
221{
222 if (!phy)
223 return;
224
225 if (!pm_runtime_enabled(&phy->dev))
226 return;
227
228 pm_runtime_forbid(&phy->dev);
229}
230EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid);
231
232/**
233 * phy_init - phy internal initialization before phy operation
234 * @phy: the phy returned by phy_get()
235 *
236 * Used to allow phy's driver to perform phy internal initialization,
237 * such as PLL block powering, clock initialization or anything that's
238 * is required by the phy to perform the start of operation.
239 * Must be called before phy_power_on().
240 *
241 * Return: %0 if successful, a negative error code otherwise
242 */
243int phy_init(struct phy *phy)
244{
245 int ret;
246
247 if (!phy)
248 return 0;
249
250 ret = phy_pm_runtime_get_sync(phy);
251 if (ret < 0 && ret != -ENOTSUPP)
252 return ret;
253 ret = 0; /* Override possible ret == -ENOTSUPP */
254
255 mutex_lock(&phy->mutex);
256 if (phy->power_count > phy->init_count)
257 dev_warn(&phy->dev, "phy_power_on was called before phy_init\n");
258
259 if (phy->init_count == 0 && phy->ops->init) {
260 ret = phy->ops->init(phy);
261 if (ret < 0) {
262 dev_err(&phy->dev, "phy init failed --> %d\n", ret);
263 goto out;
264 }
265 }
266 ++phy->init_count;
267
268out:
269 mutex_unlock(&phy->mutex);
270 phy_pm_runtime_put(phy);
271 return ret;
272}
273EXPORT_SYMBOL_GPL(phy_init);
274
275/**
276 * phy_exit - Phy internal un-initialization
277 * @phy: the phy returned by phy_get()
278 *
279 * Must be called after phy_power_off().
280 *
281 * Return: %0 if successful, a negative error code otherwise
282 */
283int phy_exit(struct phy *phy)
284{
285 int ret;
286
287 if (!phy)
288 return 0;
289
290 ret = phy_pm_runtime_get_sync(phy);
291 if (ret < 0 && ret != -ENOTSUPP)
292 return ret;
293 ret = 0; /* Override possible ret == -ENOTSUPP */
294
295 mutex_lock(&phy->mutex);
296 if (phy->init_count == 1 && phy->ops->exit) {
297 ret = phy->ops->exit(phy);
298 if (ret < 0) {
299 dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
300 goto out;
301 }
302 }
303 --phy->init_count;
304
305out:
306 mutex_unlock(&phy->mutex);
307 phy_pm_runtime_put(phy);
308 return ret;
309}
310EXPORT_SYMBOL_GPL(phy_exit);
311
312/**
313 * phy_power_on - Enable the phy and enter proper operation
314 * @phy: the phy returned by phy_get()
315 *
316 * Must be called after phy_init().
317 *
318 * Return: %0 if successful, a negative error code otherwise
319 */
320int phy_power_on(struct phy *phy)
321{
322 int ret = 0;
323
324 if (!phy)
325 goto out;
326
327 if (phy->pwr) {
328 ret = regulator_enable(phy->pwr);
329 if (ret)
330 goto out;
331 }
332
333 ret = phy_pm_runtime_get_sync(phy);
334 if (ret < 0 && ret != -ENOTSUPP)
335 goto err_pm_sync;
336
337 ret = 0; /* Override possible ret == -ENOTSUPP */
338
339 mutex_lock(&phy->mutex);
340 if (phy->power_count == 0 && phy->ops->power_on) {
341 ret = phy->ops->power_on(phy);
342 if (ret < 0) {
343 dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
344 goto err_pwr_on;
345 }
346 }
347 ++phy->power_count;
348 mutex_unlock(&phy->mutex);
349 return 0;
350
351err_pwr_on:
352 mutex_unlock(&phy->mutex);
353 phy_pm_runtime_put_sync(phy);
354err_pm_sync:
355 if (phy->pwr)
356 regulator_disable(phy->pwr);
357out:
358 return ret;
359}
360EXPORT_SYMBOL_GPL(phy_power_on);
361
362/**
363 * phy_power_off - Disable the phy.
364 * @phy: the phy returned by phy_get()
365 *
366 * Must be called before phy_exit().
367 *
368 * Return: %0 if successful, a negative error code otherwise
369 */
370int phy_power_off(struct phy *phy)
371{
372 int ret;
373
374 if (!phy)
375 return 0;
376
377 mutex_lock(&phy->mutex);
378 if (phy->power_count == 1 && phy->ops->power_off) {
379 ret = phy->ops->power_off(phy);
380 if (ret < 0) {
381 dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
382 mutex_unlock(&phy->mutex);
383 return ret;
384 }
385 }
386 --phy->power_count;
387 mutex_unlock(&phy->mutex);
388 phy_pm_runtime_put(phy);
389
390 if (phy->pwr)
391 regulator_disable(phy->pwr);
392
393 return 0;
394}
395EXPORT_SYMBOL_GPL(phy_power_off);
396
397int phy_set_mode_ext(struct phy *phy, enum phy_mode mode, int submode)
398{
399 int ret;
400
401 if (!phy || !phy->ops->set_mode)
402 return 0;
403
404 mutex_lock(&phy->mutex);
405 ret = phy->ops->set_mode(phy, mode, submode);
406 if (!ret)
407 phy->attrs.mode = mode;
408 mutex_unlock(&phy->mutex);
409
410 return ret;
411}
412EXPORT_SYMBOL_GPL(phy_set_mode_ext);
413
414int phy_set_media(struct phy *phy, enum phy_media media)
415{
416 int ret;
417
418 if (!phy || !phy->ops->set_media)
419 return 0;
420
421 mutex_lock(&phy->mutex);
422 ret = phy->ops->set_media(phy, media);
423 mutex_unlock(&phy->mutex);
424
425 return ret;
426}
427EXPORT_SYMBOL_GPL(phy_set_media);
428
429int phy_set_speed(struct phy *phy, int speed)
430{
431 int ret;
432
433 if (!phy || !phy->ops->set_speed)
434 return 0;
435
436 mutex_lock(&phy->mutex);
437 ret = phy->ops->set_speed(phy, speed);
438 mutex_unlock(&phy->mutex);
439
440 return ret;
441}
442EXPORT_SYMBOL_GPL(phy_set_speed);
443
444int phy_reset(struct phy *phy)
445{
446 int ret;
447
448 if (!phy || !phy->ops->reset)
449 return 0;
450
451 ret = phy_pm_runtime_get_sync(phy);
452 if (ret < 0 && ret != -ENOTSUPP)
453 return ret;
454
455 mutex_lock(&phy->mutex);
456 ret = phy->ops->reset(phy);
457 mutex_unlock(&phy->mutex);
458
459 phy_pm_runtime_put(phy);
460
461 return ret;
462}
463EXPORT_SYMBOL_GPL(phy_reset);
464
465/**
466 * phy_calibrate() - Tunes the phy hw parameters for current configuration
467 * @phy: the phy returned by phy_get()
468 *
469 * Used to calibrate phy hardware, typically by adjusting some parameters in
470 * runtime, which are otherwise lost after host controller reset and cannot
471 * be applied in phy_init() or phy_power_on().
472 *
473 * Return: %0 if successful, a negative error code otherwise
474 */
475int phy_calibrate(struct phy *phy)
476{
477 int ret;
478
479 if (!phy || !phy->ops->calibrate)
480 return 0;
481
482 mutex_lock(&phy->mutex);
483 ret = phy->ops->calibrate(phy);
484 mutex_unlock(&phy->mutex);
485
486 return ret;
487}
488EXPORT_SYMBOL_GPL(phy_calibrate);
489
490/**
491 * phy_configure() - Changes the phy parameters
492 * @phy: the phy returned by phy_get()
493 * @opts: New configuration to apply
494 *
495 * Used to change the PHY parameters. phy_init() must have been called
496 * on the phy. The configuration will be applied on the current phy
497 * mode, that can be changed using phy_set_mode().
498 *
499 * Return: %0 if successful, a negative error code otherwise
500 */
501int phy_configure(struct phy *phy, union phy_configure_opts *opts)
502{
503 int ret;
504
505 if (!phy)
506 return -EINVAL;
507
508 if (!phy->ops->configure)
509 return -EOPNOTSUPP;
510
511 mutex_lock(&phy->mutex);
512 ret = phy->ops->configure(phy, opts);
513 mutex_unlock(&phy->mutex);
514
515 return ret;
516}
517EXPORT_SYMBOL_GPL(phy_configure);
518
519/**
520 * phy_validate() - Checks the phy parameters
521 * @phy: the phy returned by phy_get()
522 * @mode: phy_mode the configuration is applicable to.
523 * @submode: PHY submode the configuration is applicable to.
524 * @opts: Configuration to check
525 *
526 * Used to check that the current set of parameters can be handled by
527 * the phy. Implementations are free to tune the parameters passed as
528 * arguments if needed by some implementation detail or
529 * constraints. It will not change any actual configuration of the
530 * PHY, so calling it as many times as deemed fit will have no side
531 * effect.
532 *
533 * Return: %0 if successful, a negative error code otherwise
534 */
535int phy_validate(struct phy *phy, enum phy_mode mode, int submode,
536 union phy_configure_opts *opts)
537{
538 int ret;
539
540 if (!phy)
541 return -EINVAL;
542
543 if (!phy->ops->validate)
544 return -EOPNOTSUPP;
545
546 mutex_lock(&phy->mutex);
547 ret = phy->ops->validate(phy, mode, submode, opts);
548 mutex_unlock(&phy->mutex);
549
550 return ret;
551}
552EXPORT_SYMBOL_GPL(phy_validate);
553
554/**
555 * _of_phy_get() - lookup and obtain a reference to a phy by phandle
556 * @np: device_node for which to get the phy
557 * @index: the index of the phy
558 *
559 * Returns the phy associated with the given phandle value,
560 * after getting a refcount to it or -ENODEV if there is no such phy or
561 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
562 * not yet loaded. This function uses of_xlate call back function provided
563 * while registering the phy_provider to find the phy instance.
564 */
565static struct phy *_of_phy_get(struct device_node *np, int index)
566{
567 int ret;
568 struct phy_provider *phy_provider;
569 struct phy *phy = NULL;
570 struct of_phandle_args args;
571
572 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
573 index, &args);
574 if (ret)
575 return ERR_PTR(-ENODEV);
576
577 /* This phy type handled by the usb-phy subsystem for now */
578 if (of_device_is_compatible(args.np, "usb-nop-xceiv"))
579 return ERR_PTR(-ENODEV);
580
581 mutex_lock(&phy_provider_mutex);
582 phy_provider = of_phy_provider_lookup(args.np);
583 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
584 phy = ERR_PTR(-EPROBE_DEFER);
585 goto out_unlock;
586 }
587
588 if (!of_device_is_available(args.np)) {
589 dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
590 phy = ERR_PTR(-ENODEV);
591 goto out_put_module;
592 }
593
594 phy = phy_provider->of_xlate(phy_provider->dev, &args);
595
596out_put_module:
597 module_put(phy_provider->owner);
598
599out_unlock:
600 mutex_unlock(&phy_provider_mutex);
601 of_node_put(args.np);
602
603 return phy;
604}
605
606/**
607 * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
608 * @np: device_node for which to get the phy
609 * @con_id: name of the phy from device's point of view
610 *
611 * Returns the phy driver, after getting a refcount to it; or
612 * -ENODEV if there is no such phy. The caller is responsible for
613 * calling phy_put() to release that count.
614 */
615struct phy *of_phy_get(struct device_node *np, const char *con_id)
616{
617 struct phy *phy = NULL;
618 int index = 0;
619
620 if (con_id)
621 index = of_property_match_string(np, "phy-names", con_id);
622
623 phy = _of_phy_get(np, index);
624 if (IS_ERR(phy))
625 return phy;
626
627 if (!try_module_get(phy->ops->owner))
628 return ERR_PTR(-EPROBE_DEFER);
629
630 get_device(&phy->dev);
631
632 return phy;
633}
634EXPORT_SYMBOL_GPL(of_phy_get);
635
636/**
637 * of_phy_put() - release the PHY
638 * @phy: the phy returned by of_phy_get()
639 *
640 * Releases a refcount the caller received from of_phy_get().
641 */
642void of_phy_put(struct phy *phy)
643{
644 if (!phy || IS_ERR(phy))
645 return;
646
647 mutex_lock(&phy->mutex);
648 if (phy->ops->release)
649 phy->ops->release(phy);
650 mutex_unlock(&phy->mutex);
651
652 module_put(phy->ops->owner);
653 put_device(&phy->dev);
654}
655EXPORT_SYMBOL_GPL(of_phy_put);
656
657/**
658 * phy_put() - release the PHY
659 * @dev: device that wants to release this phy
660 * @phy: the phy returned by phy_get()
661 *
662 * Releases a refcount the caller received from phy_get().
663 */
664void phy_put(struct device *dev, struct phy *phy)
665{
666 device_link_remove(dev, &phy->dev);
667 of_phy_put(phy);
668}
669EXPORT_SYMBOL_GPL(phy_put);
670
671/**
672 * devm_phy_put() - release the PHY
673 * @dev: device that wants to release this phy
674 * @phy: the phy returned by devm_phy_get()
675 *
676 * destroys the devres associated with this phy and invokes phy_put
677 * to release the phy.
678 */
679void devm_phy_put(struct device *dev, struct phy *phy)
680{
681 int r;
682
683 if (!phy)
684 return;
685
686 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
687 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
688}
689EXPORT_SYMBOL_GPL(devm_phy_put);
690
691/**
692 * of_phy_simple_xlate() - returns the phy instance from phy provider
693 * @dev: the PHY provider device
694 * @args: of_phandle_args (not used here)
695 *
696 * Intended to be used by phy provider for the common case where #phy-cells is
697 * 0. For other cases where #phy-cells is greater than '0', the phy provider
698 * should provide a custom of_xlate function that reads the *args* and returns
699 * the appropriate phy.
700 */
701struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
702 *args)
703{
704 struct phy *phy;
705 struct class_dev_iter iter;
706
707 class_dev_iter_init(&iter, phy_class, NULL, NULL);
708 while ((dev = class_dev_iter_next(&iter))) {
709 phy = to_phy(dev);
710 if (args->np != phy->dev.of_node)
711 continue;
712
713 class_dev_iter_exit(&iter);
714 return phy;
715 }
716
717 class_dev_iter_exit(&iter);
718 return ERR_PTR(-ENODEV);
719}
720EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
721
722/**
723 * phy_get() - lookup and obtain a reference to a phy.
724 * @dev: device that requests this phy
725 * @string: the phy name as given in the dt data or the name of the controller
726 * port for non-dt case
727 *
728 * Returns the phy driver, after getting a refcount to it; or
729 * -ENODEV if there is no such phy. The caller is responsible for
730 * calling phy_put() to release that count.
731 */
732struct phy *phy_get(struct device *dev, const char *string)
733{
734 int index = 0;
735 struct phy *phy;
736 struct device_link *link;
737
738 if (dev->of_node) {
739 if (string)
740 index = of_property_match_string(dev->of_node, "phy-names",
741 string);
742 else
743 index = 0;
744 phy = _of_phy_get(dev->of_node, index);
745 } else {
746 if (string == NULL) {
747 dev_WARN(dev, "missing string\n");
748 return ERR_PTR(-EINVAL);
749 }
750 phy = phy_find(dev, string);
751 }
752 if (IS_ERR(phy))
753 return phy;
754
755 if (!try_module_get(phy->ops->owner))
756 return ERR_PTR(-EPROBE_DEFER);
757
758 get_device(&phy->dev);
759
760 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
761 if (!link)
762 dev_dbg(dev, "failed to create device link to %s\n",
763 dev_name(phy->dev.parent));
764
765 return phy;
766}
767EXPORT_SYMBOL_GPL(phy_get);
768
769/**
770 * phy_optional_get() - lookup and obtain a reference to an optional phy.
771 * @dev: device that requests this phy
772 * @string: the phy name as given in the dt data or the name of the controller
773 * port for non-dt case
774 *
775 * Returns the phy driver, after getting a refcount to it; or
776 * NULL if there is no such phy. The caller is responsible for
777 * calling phy_put() to release that count.
778 */
779struct phy *phy_optional_get(struct device *dev, const char *string)
780{
781 struct phy *phy = phy_get(dev, string);
782
783 if (PTR_ERR(phy) == -ENODEV)
784 phy = NULL;
785
786 return phy;
787}
788EXPORT_SYMBOL_GPL(phy_optional_get);
789
790/**
791 * devm_phy_get() - lookup and obtain a reference to a phy.
792 * @dev: device that requests this phy
793 * @string: the phy name as given in the dt data or phy device name
794 * for non-dt case
795 *
796 * Gets the phy using phy_get(), and associates a device with it using
797 * devres. On driver detach, release function is invoked on the devres data,
798 * then, devres data is freed.
799 */
800struct phy *devm_phy_get(struct device *dev, const char *string)
801{
802 struct phy **ptr, *phy;
803
804 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
805 if (!ptr)
806 return ERR_PTR(-ENOMEM);
807
808 phy = phy_get(dev, string);
809 if (!IS_ERR(phy)) {
810 *ptr = phy;
811 devres_add(dev, ptr);
812 } else {
813 devres_free(ptr);
814 }
815
816 return phy;
817}
818EXPORT_SYMBOL_GPL(devm_phy_get);
819
820/**
821 * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
822 * @dev: device that requests this phy
823 * @string: the phy name as given in the dt data or phy device name
824 * for non-dt case
825 *
826 * Gets the phy using phy_get(), and associates a device with it using
827 * devres. On driver detach, release function is invoked on the devres
828 * data, then, devres data is freed. This differs to devm_phy_get() in
829 * that if the phy does not exist, it is not considered an error and
830 * -ENODEV will not be returned. Instead the NULL phy is returned,
831 * which can be passed to all other phy consumer calls.
832 */
833struct phy *devm_phy_optional_get(struct device *dev, const char *string)
834{
835 struct phy *phy = devm_phy_get(dev, string);
836
837 if (PTR_ERR(phy) == -ENODEV)
838 phy = NULL;
839
840 return phy;
841}
842EXPORT_SYMBOL_GPL(devm_phy_optional_get);
843
844/**
845 * devm_of_phy_get() - lookup and obtain a reference to a phy.
846 * @dev: device that requests this phy
847 * @np: node containing the phy
848 * @con_id: name of the phy from device's point of view
849 *
850 * Gets the phy using of_phy_get(), and associates a device with it using
851 * devres. On driver detach, release function is invoked on the devres data,
852 * then, devres data is freed.
853 */
854struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
855 const char *con_id)
856{
857 struct phy **ptr, *phy;
858 struct device_link *link;
859
860 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
861 if (!ptr)
862 return ERR_PTR(-ENOMEM);
863
864 phy = of_phy_get(np, con_id);
865 if (!IS_ERR(phy)) {
866 *ptr = phy;
867 devres_add(dev, ptr);
868 } else {
869 devres_free(ptr);
870 return phy;
871 }
872
873 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
874 if (!link)
875 dev_dbg(dev, "failed to create device link to %s\n",
876 dev_name(phy->dev.parent));
877
878 return phy;
879}
880EXPORT_SYMBOL_GPL(devm_of_phy_get);
881
882/**
883 * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
884 * @dev: device that requests this phy
885 * @np: node containing the phy
886 * @index: index of the phy
887 *
888 * Gets the phy using _of_phy_get(), then gets a refcount to it,
889 * and associates a device with it using devres. On driver detach,
890 * release function is invoked on the devres data,
891 * then, devres data is freed.
892 *
893 */
894struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
895 int index)
896{
897 struct phy **ptr, *phy;
898 struct device_link *link;
899
900 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
901 if (!ptr)
902 return ERR_PTR(-ENOMEM);
903
904 phy = _of_phy_get(np, index);
905 if (IS_ERR(phy)) {
906 devres_free(ptr);
907 return phy;
908 }
909
910 if (!try_module_get(phy->ops->owner)) {
911 devres_free(ptr);
912 return ERR_PTR(-EPROBE_DEFER);
913 }
914
915 get_device(&phy->dev);
916
917 *ptr = phy;
918 devres_add(dev, ptr);
919
920 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
921 if (!link)
922 dev_dbg(dev, "failed to create device link to %s\n",
923 dev_name(phy->dev.parent));
924
925 return phy;
926}
927EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
928
929/**
930 * phy_create() - create a new phy
931 * @dev: device that is creating the new phy
932 * @node: device node of the phy
933 * @ops: function pointers for performing phy operations
934 *
935 * Called to create a phy using phy framework.
936 */
937struct phy *phy_create(struct device *dev, struct device_node *node,
938 const struct phy_ops *ops)
939{
940 int ret;
941 int id;
942 struct phy *phy;
943
944 if (WARN_ON(!dev))
945 return ERR_PTR(-EINVAL);
946
947 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
948 if (!phy)
949 return ERR_PTR(-ENOMEM);
950
951 id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
952 if (id < 0) {
953 dev_err(dev, "unable to get id\n");
954 ret = id;
955 goto free_phy;
956 }
957
958 device_initialize(&phy->dev);
959 mutex_init(&phy->mutex);
960
961 phy->dev.class = phy_class;
962 phy->dev.parent = dev;
963 phy->dev.of_node = node ?: dev->of_node;
964 phy->id = id;
965 phy->ops = ops;
966
967 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
968 if (ret)
969 goto put_dev;
970
971 /* phy-supply */
972 phy->pwr = regulator_get_optional(&phy->dev, "phy");
973 if (IS_ERR(phy->pwr)) {
974 ret = PTR_ERR(phy->pwr);
975 if (ret == -EPROBE_DEFER)
976 goto put_dev;
977
978 phy->pwr = NULL;
979 }
980
981 ret = device_add(&phy->dev);
982 if (ret)
983 goto put_dev;
984
985 if (pm_runtime_enabled(dev)) {
986 pm_runtime_enable(&phy->dev);
987 pm_runtime_no_callbacks(&phy->dev);
988 }
989
990 return phy;
991
992put_dev:
993 put_device(&phy->dev); /* calls phy_release() which frees resources */
994 return ERR_PTR(ret);
995
996free_phy:
997 kfree(phy);
998 return ERR_PTR(ret);
999}
1000EXPORT_SYMBOL_GPL(phy_create);
1001
1002/**
1003 * devm_phy_create() - create a new phy
1004 * @dev: device that is creating the new phy
1005 * @node: device node of the phy
1006 * @ops: function pointers for performing phy operations
1007 *
1008 * Creates a new PHY device adding it to the PHY class.
1009 * While at that, it also associates the device with the phy using devres.
1010 * On driver detach, release function is invoked on the devres data,
1011 * then, devres data is freed.
1012 */
1013struct phy *devm_phy_create(struct device *dev, struct device_node *node,
1014 const struct phy_ops *ops)
1015{
1016 struct phy **ptr, *phy;
1017
1018 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
1019 if (!ptr)
1020 return ERR_PTR(-ENOMEM);
1021
1022 phy = phy_create(dev, node, ops);
1023 if (!IS_ERR(phy)) {
1024 *ptr = phy;
1025 devres_add(dev, ptr);
1026 } else {
1027 devres_free(ptr);
1028 }
1029
1030 return phy;
1031}
1032EXPORT_SYMBOL_GPL(devm_phy_create);
1033
1034/**
1035 * phy_destroy() - destroy the phy
1036 * @phy: the phy to be destroyed
1037 *
1038 * Called to destroy the phy.
1039 */
1040void phy_destroy(struct phy *phy)
1041{
1042 pm_runtime_disable(&phy->dev);
1043 device_unregister(&phy->dev);
1044}
1045EXPORT_SYMBOL_GPL(phy_destroy);
1046
1047/**
1048 * devm_phy_destroy() - destroy the PHY
1049 * @dev: device that wants to release this phy
1050 * @phy: the phy returned by devm_phy_get()
1051 *
1052 * destroys the devres associated with this phy and invokes phy_destroy
1053 * to destroy the phy.
1054 */
1055void devm_phy_destroy(struct device *dev, struct phy *phy)
1056{
1057 int r;
1058
1059 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
1060 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
1061}
1062EXPORT_SYMBOL_GPL(devm_phy_destroy);
1063
1064/**
1065 * __of_phy_provider_register() - create/register phy provider with the framework
1066 * @dev: struct device of the phy provider
1067 * @children: device node containing children (if different from dev->of_node)
1068 * @owner: the module owner containing of_xlate
1069 * @of_xlate: function pointer to obtain phy instance from phy provider
1070 *
1071 * Creates struct phy_provider from dev and of_xlate function pointer.
1072 * This is used in the case of dt boot for finding the phy instance from
1073 * phy provider.
1074 *
1075 * If the PHY provider doesn't nest children directly but uses a separate
1076 * child node to contain the individual children, the @children parameter
1077 * can be used to override the default. If NULL, the default (dev->of_node)
1078 * will be used. If non-NULL, the device node must be a child (or further
1079 * descendant) of dev->of_node. Otherwise an ERR_PTR()-encoded -EINVAL
1080 * error code is returned.
1081 */
1082struct phy_provider *__of_phy_provider_register(struct device *dev,
1083 struct device_node *children, struct module *owner,
1084 struct phy * (*of_xlate)(struct device *dev,
1085 struct of_phandle_args *args))
1086{
1087 struct phy_provider *phy_provider;
1088
1089 /*
1090 * If specified, the device node containing the children must itself
1091 * be the provider's device node or a child (or further descendant)
1092 * thereof.
1093 */
1094 if (children) {
1095 struct device_node *parent = of_node_get(children), *next;
1096
1097 while (parent) {
1098 if (parent == dev->of_node)
1099 break;
1100
1101 next = of_get_parent(parent);
1102 of_node_put(parent);
1103 parent = next;
1104 }
1105
1106 if (!parent)
1107 return ERR_PTR(-EINVAL);
1108
1109 of_node_put(parent);
1110 } else {
1111 children = dev->of_node;
1112 }
1113
1114 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
1115 if (!phy_provider)
1116 return ERR_PTR(-ENOMEM);
1117
1118 phy_provider->dev = dev;
1119 phy_provider->children = of_node_get(children);
1120 phy_provider->owner = owner;
1121 phy_provider->of_xlate = of_xlate;
1122
1123 mutex_lock(&phy_provider_mutex);
1124 list_add_tail(&phy_provider->list, &phy_provider_list);
1125 mutex_unlock(&phy_provider_mutex);
1126
1127 return phy_provider;
1128}
1129EXPORT_SYMBOL_GPL(__of_phy_provider_register);
1130
1131/**
1132 * __devm_of_phy_provider_register() - create/register phy provider with the
1133 * framework
1134 * @dev: struct device of the phy provider
1135 * @children: device node containing children (if different from dev->of_node)
1136 * @owner: the module owner containing of_xlate
1137 * @of_xlate: function pointer to obtain phy instance from phy provider
1138 *
1139 * Creates struct phy_provider from dev and of_xlate function pointer.
1140 * This is used in the case of dt boot for finding the phy instance from
1141 * phy provider. While at that, it also associates the device with the
1142 * phy provider using devres. On driver detach, release function is invoked
1143 * on the devres data, then, devres data is freed.
1144 */
1145struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
1146 struct device_node *children, struct module *owner,
1147 struct phy * (*of_xlate)(struct device *dev,
1148 struct of_phandle_args *args))
1149{
1150 struct phy_provider **ptr, *phy_provider;
1151
1152 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
1153 if (!ptr)
1154 return ERR_PTR(-ENOMEM);
1155
1156 phy_provider = __of_phy_provider_register(dev, children, owner,
1157 of_xlate);
1158 if (!IS_ERR(phy_provider)) {
1159 *ptr = phy_provider;
1160 devres_add(dev, ptr);
1161 } else {
1162 devres_free(ptr);
1163 }
1164
1165 return phy_provider;
1166}
1167EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);
1168
1169/**
1170 * of_phy_provider_unregister() - unregister phy provider from the framework
1171 * @phy_provider: phy provider returned by of_phy_provider_register()
1172 *
1173 * Removes the phy_provider created using of_phy_provider_register().
1174 */
1175void of_phy_provider_unregister(struct phy_provider *phy_provider)
1176{
1177 if (IS_ERR(phy_provider))
1178 return;
1179
1180 mutex_lock(&phy_provider_mutex);
1181 list_del(&phy_provider->list);
1182 of_node_put(phy_provider->children);
1183 kfree(phy_provider);
1184 mutex_unlock(&phy_provider_mutex);
1185}
1186EXPORT_SYMBOL_GPL(of_phy_provider_unregister);
1187
1188/**
1189 * devm_of_phy_provider_unregister() - remove phy provider from the framework
1190 * @dev: struct device of the phy provider
1191 * @phy_provider: phy provider returned by of_phy_provider_register()
1192 *
1193 * destroys the devres associated with this phy provider and invokes
1194 * of_phy_provider_unregister to unregister the phy provider.
1195 */
1196void devm_of_phy_provider_unregister(struct device *dev,
1197 struct phy_provider *phy_provider)
1198{
1199 int r;
1200
1201 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
1202 phy_provider);
1203 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
1204}
1205EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
1206
1207/**
1208 * phy_release() - release the phy
1209 * @dev: the dev member within phy
1210 *
1211 * When the last reference to the device is removed, it is called
1212 * from the embedded kobject as release method.
1213 */
1214static void phy_release(struct device *dev)
1215{
1216 struct phy *phy;
1217
1218 phy = to_phy(dev);
1219 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
1220 regulator_put(phy->pwr);
1221 ida_simple_remove(&phy_ida, phy->id);
1222 kfree(phy);
1223}
1224
1225static int __init phy_core_init(void)
1226{
1227 phy_class = class_create(THIS_MODULE, "phy");
1228 if (IS_ERR(phy_class)) {
1229 pr_err("failed to create phy class --> %ld\n",
1230 PTR_ERR(phy_class));
1231 return PTR_ERR(phy_class);
1232 }
1233
1234 phy_class->dev_release = phy_release;
1235
1236 return 0;
1237}
1238device_initcall(phy_core_init);