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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_set_media(struct phy *phy, enum phy_media media)
377{
378 int ret;
379
380 if (!phy || !phy->ops->set_media)
381 return 0;
382
383 mutex_lock(&phy->mutex);
384 ret = phy->ops->set_media(phy, media);
385 mutex_unlock(&phy->mutex);
386
387 return ret;
388}
389EXPORT_SYMBOL_GPL(phy_set_media);
390
391int phy_set_speed(struct phy *phy, int speed)
392{
393 int ret;
394
395 if (!phy || !phy->ops->set_speed)
396 return 0;
397
398 mutex_lock(&phy->mutex);
399 ret = phy->ops->set_speed(phy, speed);
400 mutex_unlock(&phy->mutex);
401
402 return ret;
403}
404EXPORT_SYMBOL_GPL(phy_set_speed);
405
406int phy_reset(struct phy *phy)
407{
408 int ret;
409
410 if (!phy || !phy->ops->reset)
411 return 0;
412
413 ret = phy_pm_runtime_get_sync(phy);
414 if (ret < 0 && ret != -ENOTSUPP)
415 return ret;
416
417 mutex_lock(&phy->mutex);
418 ret = phy->ops->reset(phy);
419 mutex_unlock(&phy->mutex);
420
421 phy_pm_runtime_put(phy);
422
423 return ret;
424}
425EXPORT_SYMBOL_GPL(phy_reset);
426
427/**
428 * phy_calibrate() - Tunes the phy hw parameters for current configuration
429 * @phy: the phy returned by phy_get()
430 *
431 * Used to calibrate phy hardware, typically by adjusting some parameters in
432 * runtime, which are otherwise lost after host controller reset and cannot
433 * be applied in phy_init() or phy_power_on().
434 *
435 * Returns: 0 if successful, an negative error code otherwise
436 */
437int phy_calibrate(struct phy *phy)
438{
439 int ret;
440
441 if (!phy || !phy->ops->calibrate)
442 return 0;
443
444 mutex_lock(&phy->mutex);
445 ret = phy->ops->calibrate(phy);
446 mutex_unlock(&phy->mutex);
447
448 return ret;
449}
450EXPORT_SYMBOL_GPL(phy_calibrate);
451
452/**
453 * phy_configure() - Changes the phy parameters
454 * @phy: the phy returned by phy_get()
455 * @opts: New configuration to apply
456 *
457 * Used to change the PHY parameters. phy_init() must have been called
458 * on the phy. The configuration will be applied on the current phy
459 * mode, that can be changed using phy_set_mode().
460 *
461 * Returns: 0 if successful, an negative error code otherwise
462 */
463int phy_configure(struct phy *phy, union phy_configure_opts *opts)
464{
465 int ret;
466
467 if (!phy)
468 return -EINVAL;
469
470 if (!phy->ops->configure)
471 return -EOPNOTSUPP;
472
473 mutex_lock(&phy->mutex);
474 ret = phy->ops->configure(phy, opts);
475 mutex_unlock(&phy->mutex);
476
477 return ret;
478}
479EXPORT_SYMBOL_GPL(phy_configure);
480
481/**
482 * phy_validate() - Checks the phy parameters
483 * @phy: the phy returned by phy_get()
484 * @mode: phy_mode the configuration is applicable to.
485 * @submode: PHY submode the configuration is applicable to.
486 * @opts: Configuration to check
487 *
488 * Used to check that the current set of parameters can be handled by
489 * the phy. Implementations are free to tune the parameters passed as
490 * arguments if needed by some implementation detail or
491 * constraints. It will not change any actual configuration of the
492 * PHY, so calling it as many times as deemed fit will have no side
493 * effect.
494 *
495 * Returns: 0 if successful, an negative error code otherwise
496 */
497int phy_validate(struct phy *phy, enum phy_mode mode, int submode,
498 union phy_configure_opts *opts)
499{
500 int ret;
501
502 if (!phy)
503 return -EINVAL;
504
505 if (!phy->ops->validate)
506 return -EOPNOTSUPP;
507
508 mutex_lock(&phy->mutex);
509 ret = phy->ops->validate(phy, mode, submode, opts);
510 mutex_unlock(&phy->mutex);
511
512 return ret;
513}
514EXPORT_SYMBOL_GPL(phy_validate);
515
516/**
517 * _of_phy_get() - lookup and obtain a reference to a phy by phandle
518 * @np: device_node for which to get the phy
519 * @index: the index of the phy
520 *
521 * Returns the phy associated with the given phandle value,
522 * after getting a refcount to it or -ENODEV if there is no such phy or
523 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
524 * not yet loaded. This function uses of_xlate call back function provided
525 * while registering the phy_provider to find the phy instance.
526 */
527static struct phy *_of_phy_get(struct device_node *np, int index)
528{
529 int ret;
530 struct phy_provider *phy_provider;
531 struct phy *phy = NULL;
532 struct of_phandle_args args;
533
534 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
535 index, &args);
536 if (ret)
537 return ERR_PTR(-ENODEV);
538
539 /* This phy type handled by the usb-phy subsystem for now */
540 if (of_device_is_compatible(args.np, "usb-nop-xceiv"))
541 return ERR_PTR(-ENODEV);
542
543 mutex_lock(&phy_provider_mutex);
544 phy_provider = of_phy_provider_lookup(args.np);
545 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
546 phy = ERR_PTR(-EPROBE_DEFER);
547 goto out_unlock;
548 }
549
550 if (!of_device_is_available(args.np)) {
551 dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
552 phy = ERR_PTR(-ENODEV);
553 goto out_put_module;
554 }
555
556 phy = phy_provider->of_xlate(phy_provider->dev, &args);
557
558out_put_module:
559 module_put(phy_provider->owner);
560
561out_unlock:
562 mutex_unlock(&phy_provider_mutex);
563 of_node_put(args.np);
564
565 return phy;
566}
567
568/**
569 * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
570 * @np: device_node for which to get the phy
571 * @con_id: name of the phy from device's point of view
572 *
573 * Returns the phy driver, after getting a refcount to it; or
574 * -ENODEV if there is no such phy. The caller is responsible for
575 * calling phy_put() to release that count.
576 */
577struct phy *of_phy_get(struct device_node *np, const char *con_id)
578{
579 struct phy *phy = NULL;
580 int index = 0;
581
582 if (con_id)
583 index = of_property_match_string(np, "phy-names", con_id);
584
585 phy = _of_phy_get(np, index);
586 if (IS_ERR(phy))
587 return phy;
588
589 if (!try_module_get(phy->ops->owner))
590 return ERR_PTR(-EPROBE_DEFER);
591
592 get_device(&phy->dev);
593
594 return phy;
595}
596EXPORT_SYMBOL_GPL(of_phy_get);
597
598/**
599 * of_phy_put() - release the PHY
600 * @phy: the phy returned by of_phy_get()
601 *
602 * Releases a refcount the caller received from of_phy_get().
603 */
604void of_phy_put(struct phy *phy)
605{
606 if (!phy || IS_ERR(phy))
607 return;
608
609 mutex_lock(&phy->mutex);
610 if (phy->ops->release)
611 phy->ops->release(phy);
612 mutex_unlock(&phy->mutex);
613
614 module_put(phy->ops->owner);
615 put_device(&phy->dev);
616}
617EXPORT_SYMBOL_GPL(of_phy_put);
618
619/**
620 * phy_put() - release the PHY
621 * @dev: device that wants to release this phy
622 * @phy: the phy returned by phy_get()
623 *
624 * Releases a refcount the caller received from phy_get().
625 */
626void phy_put(struct device *dev, struct phy *phy)
627{
628 device_link_remove(dev, &phy->dev);
629 of_phy_put(phy);
630}
631EXPORT_SYMBOL_GPL(phy_put);
632
633/**
634 * devm_phy_put() - release the PHY
635 * @dev: device that wants to release this phy
636 * @phy: the phy returned by devm_phy_get()
637 *
638 * destroys the devres associated with this phy and invokes phy_put
639 * to release the phy.
640 */
641void devm_phy_put(struct device *dev, struct phy *phy)
642{
643 int r;
644
645 if (!phy)
646 return;
647
648 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
649 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
650}
651EXPORT_SYMBOL_GPL(devm_phy_put);
652
653/**
654 * of_phy_simple_xlate() - returns the phy instance from phy provider
655 * @dev: the PHY provider device
656 * @args: of_phandle_args (not used here)
657 *
658 * Intended to be used by phy provider for the common case where #phy-cells is
659 * 0. For other cases where #phy-cells is greater than '0', the phy provider
660 * should provide a custom of_xlate function that reads the *args* and returns
661 * the appropriate phy.
662 */
663struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
664 *args)
665{
666 struct phy *phy;
667 struct class_dev_iter iter;
668
669 class_dev_iter_init(&iter, phy_class, NULL, NULL);
670 while ((dev = class_dev_iter_next(&iter))) {
671 phy = to_phy(dev);
672 if (args->np != phy->dev.of_node)
673 continue;
674
675 class_dev_iter_exit(&iter);
676 return phy;
677 }
678
679 class_dev_iter_exit(&iter);
680 return ERR_PTR(-ENODEV);
681}
682EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
683
684/**
685 * phy_get() - lookup and obtain a reference to a phy.
686 * @dev: device that requests this phy
687 * @string: the phy name as given in the dt data or the name of the controller
688 * port for non-dt case
689 *
690 * Returns the phy driver, after getting a refcount to it; or
691 * -ENODEV if there is no such phy. The caller is responsible for
692 * calling phy_put() to release that count.
693 */
694struct phy *phy_get(struct device *dev, const char *string)
695{
696 int index = 0;
697 struct phy *phy;
698 struct device_link *link;
699
700 if (dev->of_node) {
701 if (string)
702 index = of_property_match_string(dev->of_node, "phy-names",
703 string);
704 else
705 index = 0;
706 phy = _of_phy_get(dev->of_node, index);
707 } else {
708 if (string == NULL) {
709 dev_WARN(dev, "missing string\n");
710 return ERR_PTR(-EINVAL);
711 }
712 phy = phy_find(dev, string);
713 }
714 if (IS_ERR(phy))
715 return phy;
716
717 if (!try_module_get(phy->ops->owner))
718 return ERR_PTR(-EPROBE_DEFER);
719
720 get_device(&phy->dev);
721
722 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
723 if (!link)
724 dev_dbg(dev, "failed to create device link to %s\n",
725 dev_name(phy->dev.parent));
726
727 return phy;
728}
729EXPORT_SYMBOL_GPL(phy_get);
730
731/**
732 * phy_optional_get() - lookup and obtain a reference to an optional phy.
733 * @dev: device that requests this phy
734 * @string: the phy name as given in the dt data or the name of the controller
735 * port for non-dt case
736 *
737 * Returns the phy driver, after getting a refcount to it; or
738 * NULL if there is no such phy. The caller is responsible for
739 * calling phy_put() to release that count.
740 */
741struct phy *phy_optional_get(struct device *dev, const char *string)
742{
743 struct phy *phy = phy_get(dev, string);
744
745 if (PTR_ERR(phy) == -ENODEV)
746 phy = NULL;
747
748 return phy;
749}
750EXPORT_SYMBOL_GPL(phy_optional_get);
751
752/**
753 * devm_phy_get() - lookup and obtain a reference to a phy.
754 * @dev: device that requests this phy
755 * @string: the phy name as given in the dt data or phy device name
756 * for non-dt case
757 *
758 * Gets the phy using phy_get(), and associates a device with it using
759 * devres. On driver detach, release function is invoked on the devres data,
760 * then, devres data is freed.
761 */
762struct phy *devm_phy_get(struct device *dev, const char *string)
763{
764 struct phy **ptr, *phy;
765
766 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
767 if (!ptr)
768 return ERR_PTR(-ENOMEM);
769
770 phy = phy_get(dev, string);
771 if (!IS_ERR(phy)) {
772 *ptr = phy;
773 devres_add(dev, ptr);
774 } else {
775 devres_free(ptr);
776 }
777
778 return phy;
779}
780EXPORT_SYMBOL_GPL(devm_phy_get);
781
782/**
783 * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
784 * @dev: device that requests this phy
785 * @string: the phy name as given in the dt data or phy device name
786 * for non-dt case
787 *
788 * Gets the phy using phy_get(), and associates a device with it using
789 * devres. On driver detach, release function is invoked on the devres
790 * data, then, devres data is freed. This differs to devm_phy_get() in
791 * that if the phy does not exist, it is not considered an error and
792 * -ENODEV will not be returned. Instead the NULL phy is returned,
793 * which can be passed to all other phy consumer calls.
794 */
795struct phy *devm_phy_optional_get(struct device *dev, const char *string)
796{
797 struct phy *phy = devm_phy_get(dev, string);
798
799 if (PTR_ERR(phy) == -ENODEV)
800 phy = NULL;
801
802 return phy;
803}
804EXPORT_SYMBOL_GPL(devm_phy_optional_get);
805
806/**
807 * devm_of_phy_get() - lookup and obtain a reference to a phy.
808 * @dev: device that requests this phy
809 * @np: node containing the phy
810 * @con_id: name of the phy from device's point of view
811 *
812 * Gets the phy using of_phy_get(), and associates a device with it using
813 * devres. On driver detach, release function is invoked on the devres data,
814 * then, devres data is freed.
815 */
816struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
817 const char *con_id)
818{
819 struct phy **ptr, *phy;
820 struct device_link *link;
821
822 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
823 if (!ptr)
824 return ERR_PTR(-ENOMEM);
825
826 phy = of_phy_get(np, con_id);
827 if (!IS_ERR(phy)) {
828 *ptr = phy;
829 devres_add(dev, ptr);
830 } else {
831 devres_free(ptr);
832 return phy;
833 }
834
835 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
836 if (!link)
837 dev_dbg(dev, "failed to create device link to %s\n",
838 dev_name(phy->dev.parent));
839
840 return phy;
841}
842EXPORT_SYMBOL_GPL(devm_of_phy_get);
843
844/**
845 * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
846 * @dev: device that requests this phy
847 * @np: node containing the phy
848 * @index: index of the phy
849 *
850 * Gets the phy using _of_phy_get(), then gets a refcount to it,
851 * and associates a device with it using devres. On driver detach,
852 * release function is invoked on the devres data,
853 * then, devres data is freed.
854 *
855 */
856struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
857 int index)
858{
859 struct phy **ptr, *phy;
860 struct device_link *link;
861
862 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
863 if (!ptr)
864 return ERR_PTR(-ENOMEM);
865
866 phy = _of_phy_get(np, index);
867 if (IS_ERR(phy)) {
868 devres_free(ptr);
869 return phy;
870 }
871
872 if (!try_module_get(phy->ops->owner)) {
873 devres_free(ptr);
874 return ERR_PTR(-EPROBE_DEFER);
875 }
876
877 get_device(&phy->dev);
878
879 *ptr = phy;
880 devres_add(dev, ptr);
881
882 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
883 if (!link)
884 dev_dbg(dev, "failed to create device link to %s\n",
885 dev_name(phy->dev.parent));
886
887 return phy;
888}
889EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
890
891/**
892 * phy_create() - create a new phy
893 * @dev: device that is creating the new phy
894 * @node: device node of the phy
895 * @ops: function pointers for performing phy operations
896 *
897 * Called to create a phy using phy framework.
898 */
899struct phy *phy_create(struct device *dev, struct device_node *node,
900 const struct phy_ops *ops)
901{
902 int ret;
903 int id;
904 struct phy *phy;
905
906 if (WARN_ON(!dev))
907 return ERR_PTR(-EINVAL);
908
909 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
910 if (!phy)
911 return ERR_PTR(-ENOMEM);
912
913 id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
914 if (id < 0) {
915 dev_err(dev, "unable to get id\n");
916 ret = id;
917 goto free_phy;
918 }
919
920 device_initialize(&phy->dev);
921 mutex_init(&phy->mutex);
922
923 phy->dev.class = phy_class;
924 phy->dev.parent = dev;
925 phy->dev.of_node = node ?: dev->of_node;
926 phy->id = id;
927 phy->ops = ops;
928
929 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
930 if (ret)
931 goto put_dev;
932
933 /* phy-supply */
934 phy->pwr = regulator_get_optional(&phy->dev, "phy");
935 if (IS_ERR(phy->pwr)) {
936 ret = PTR_ERR(phy->pwr);
937 if (ret == -EPROBE_DEFER)
938 goto put_dev;
939
940 phy->pwr = NULL;
941 }
942
943 ret = device_add(&phy->dev);
944 if (ret)
945 goto put_dev;
946
947 if (pm_runtime_enabled(dev)) {
948 pm_runtime_enable(&phy->dev);
949 pm_runtime_no_callbacks(&phy->dev);
950 }
951
952 return phy;
953
954put_dev:
955 put_device(&phy->dev); /* calls phy_release() which frees resources */
956 return ERR_PTR(ret);
957
958free_phy:
959 kfree(phy);
960 return ERR_PTR(ret);
961}
962EXPORT_SYMBOL_GPL(phy_create);
963
964/**
965 * devm_phy_create() - create a new phy
966 * @dev: device that is creating the new phy
967 * @node: device node of the phy
968 * @ops: function pointers for performing phy operations
969 *
970 * Creates a new PHY device adding it to the PHY class.
971 * While at that, it also associates the device with the phy using devres.
972 * On driver detach, release function is invoked on the devres data,
973 * then, devres data is freed.
974 */
975struct phy *devm_phy_create(struct device *dev, struct device_node *node,
976 const struct phy_ops *ops)
977{
978 struct phy **ptr, *phy;
979
980 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
981 if (!ptr)
982 return ERR_PTR(-ENOMEM);
983
984 phy = phy_create(dev, node, ops);
985 if (!IS_ERR(phy)) {
986 *ptr = phy;
987 devres_add(dev, ptr);
988 } else {
989 devres_free(ptr);
990 }
991
992 return phy;
993}
994EXPORT_SYMBOL_GPL(devm_phy_create);
995
996/**
997 * phy_destroy() - destroy the phy
998 * @phy: the phy to be destroyed
999 *
1000 * Called to destroy the phy.
1001 */
1002void phy_destroy(struct phy *phy)
1003{
1004 pm_runtime_disable(&phy->dev);
1005 device_unregister(&phy->dev);
1006}
1007EXPORT_SYMBOL_GPL(phy_destroy);
1008
1009/**
1010 * devm_phy_destroy() - destroy the PHY
1011 * @dev: device that wants to release this phy
1012 * @phy: the phy returned by devm_phy_get()
1013 *
1014 * destroys the devres associated with this phy and invokes phy_destroy
1015 * to destroy the phy.
1016 */
1017void devm_phy_destroy(struct device *dev, struct phy *phy)
1018{
1019 int r;
1020
1021 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
1022 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
1023}
1024EXPORT_SYMBOL_GPL(devm_phy_destroy);
1025
1026/**
1027 * __of_phy_provider_register() - create/register phy provider with the framework
1028 * @dev: struct device of the phy provider
1029 * @children: device node containing children (if different from dev->of_node)
1030 * @owner: the module owner containing of_xlate
1031 * @of_xlate: function pointer to obtain phy instance from phy provider
1032 *
1033 * Creates struct phy_provider from dev and of_xlate function pointer.
1034 * This is used in the case of dt boot for finding the phy instance from
1035 * phy provider.
1036 *
1037 * If the PHY provider doesn't nest children directly but uses a separate
1038 * child node to contain the individual children, the @children parameter
1039 * can be used to override the default. If NULL, the default (dev->of_node)
1040 * will be used. If non-NULL, the device node must be a child (or further
1041 * descendant) of dev->of_node. Otherwise an ERR_PTR()-encoded -EINVAL
1042 * error code is returned.
1043 */
1044struct phy_provider *__of_phy_provider_register(struct device *dev,
1045 struct device_node *children, struct module *owner,
1046 struct phy * (*of_xlate)(struct device *dev,
1047 struct of_phandle_args *args))
1048{
1049 struct phy_provider *phy_provider;
1050
1051 /*
1052 * If specified, the device node containing the children must itself
1053 * be the provider's device node or a child (or further descendant)
1054 * thereof.
1055 */
1056 if (children) {
1057 struct device_node *parent = of_node_get(children), *next;
1058
1059 while (parent) {
1060 if (parent == dev->of_node)
1061 break;
1062
1063 next = of_get_parent(parent);
1064 of_node_put(parent);
1065 parent = next;
1066 }
1067
1068 if (!parent)
1069 return ERR_PTR(-EINVAL);
1070
1071 of_node_put(parent);
1072 } else {
1073 children = dev->of_node;
1074 }
1075
1076 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
1077 if (!phy_provider)
1078 return ERR_PTR(-ENOMEM);
1079
1080 phy_provider->dev = dev;
1081 phy_provider->children = of_node_get(children);
1082 phy_provider->owner = owner;
1083 phy_provider->of_xlate = of_xlate;
1084
1085 mutex_lock(&phy_provider_mutex);
1086 list_add_tail(&phy_provider->list, &phy_provider_list);
1087 mutex_unlock(&phy_provider_mutex);
1088
1089 return phy_provider;
1090}
1091EXPORT_SYMBOL_GPL(__of_phy_provider_register);
1092
1093/**
1094 * __devm_of_phy_provider_register() - create/register phy provider with the
1095 * framework
1096 * @dev: struct device of the phy provider
1097 * @children: device node containing children (if different from dev->of_node)
1098 * @owner: the module owner containing of_xlate
1099 * @of_xlate: function pointer to obtain phy instance from phy provider
1100 *
1101 * Creates struct phy_provider from dev and of_xlate function pointer.
1102 * This is used in the case of dt boot for finding the phy instance from
1103 * phy provider. While at that, it also associates the device with the
1104 * phy provider using devres. On driver detach, release function is invoked
1105 * on the devres data, then, devres data is freed.
1106 */
1107struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
1108 struct device_node *children, struct module *owner,
1109 struct phy * (*of_xlate)(struct device *dev,
1110 struct of_phandle_args *args))
1111{
1112 struct phy_provider **ptr, *phy_provider;
1113
1114 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
1115 if (!ptr)
1116 return ERR_PTR(-ENOMEM);
1117
1118 phy_provider = __of_phy_provider_register(dev, children, owner,
1119 of_xlate);
1120 if (!IS_ERR(phy_provider)) {
1121 *ptr = phy_provider;
1122 devres_add(dev, ptr);
1123 } else {
1124 devres_free(ptr);
1125 }
1126
1127 return phy_provider;
1128}
1129EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);
1130
1131/**
1132 * of_phy_provider_unregister() - unregister phy provider from the framework
1133 * @phy_provider: phy provider returned by of_phy_provider_register()
1134 *
1135 * Removes the phy_provider created using of_phy_provider_register().
1136 */
1137void of_phy_provider_unregister(struct phy_provider *phy_provider)
1138{
1139 if (IS_ERR(phy_provider))
1140 return;
1141
1142 mutex_lock(&phy_provider_mutex);
1143 list_del(&phy_provider->list);
1144 of_node_put(phy_provider->children);
1145 kfree(phy_provider);
1146 mutex_unlock(&phy_provider_mutex);
1147}
1148EXPORT_SYMBOL_GPL(of_phy_provider_unregister);
1149
1150/**
1151 * devm_of_phy_provider_unregister() - remove phy provider from the framework
1152 * @dev: struct device of the phy provider
1153 * @phy_provider: phy provider returned by of_phy_provider_register()
1154 *
1155 * destroys the devres associated with this phy provider and invokes
1156 * of_phy_provider_unregister to unregister the phy provider.
1157 */
1158void devm_of_phy_provider_unregister(struct device *dev,
1159 struct phy_provider *phy_provider)
1160{
1161 int r;
1162
1163 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
1164 phy_provider);
1165 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
1166}
1167EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
1168
1169/**
1170 * phy_release() - release the phy
1171 * @dev: the dev member within phy
1172 *
1173 * When the last reference to the device is removed, it is called
1174 * from the embedded kobject as release method.
1175 */
1176static void phy_release(struct device *dev)
1177{
1178 struct phy *phy;
1179
1180 phy = to_phy(dev);
1181 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
1182 regulator_put(phy->pwr);
1183 ida_simple_remove(&phy_ida, phy->id);
1184 kfree(phy);
1185}
1186
1187static int __init phy_core_init(void)
1188{
1189 phy_class = class_create(THIS_MODULE, "phy");
1190 if (IS_ERR(phy_class)) {
1191 pr_err("failed to create phy class --> %ld\n",
1192 PTR_ERR(phy_class));
1193 return PTR_ERR(phy_class);
1194 }
1195
1196 phy_class->dev_release = phy_release;
1197
1198 return 0;
1199}
1200device_initcall(phy_core_init);