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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
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);
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/debugfs.h>
15#include <linux/device.h>
16#include <linux/slab.h>
17#include <linux/of.h>
18#include <linux/phy/phy.h>
19#include <linux/idr.h>
20#include <linux/pm_runtime.h>
21#include <linux/regulator/consumer.h>
22
23static struct class *phy_class;
24static struct dentry *phy_debugfs_root;
25static DEFINE_MUTEX(phy_provider_mutex);
26static LIST_HEAD(phy_provider_list);
27static LIST_HEAD(phys);
28static DEFINE_IDA(phy_ida);
29
30static void devm_phy_release(struct device *dev, void *res)
31{
32 struct phy *phy = *(struct phy **)res;
33
34 phy_put(dev, phy);
35}
36
37static void devm_phy_provider_release(struct device *dev, void *res)
38{
39 struct phy_provider *phy_provider = *(struct phy_provider **)res;
40
41 of_phy_provider_unregister(phy_provider);
42}
43
44static void devm_phy_consume(struct device *dev, void *res)
45{
46 struct phy *phy = *(struct phy **)res;
47
48 phy_destroy(phy);
49}
50
51static int devm_phy_match(struct device *dev, void *res, void *match_data)
52{
53 struct phy **phy = res;
54
55 return *phy == match_data;
56}
57
58/**
59 * phy_create_lookup() - allocate and register PHY/device association
60 * @phy: the phy of the association
61 * @con_id: connection ID string on device
62 * @dev_id: the device of the association
63 *
64 * Creates and registers phy_lookup entry.
65 */
66int phy_create_lookup(struct phy *phy, const char *con_id, const char *dev_id)
67{
68 struct phy_lookup *pl;
69
70 if (!phy || !dev_id || !con_id)
71 return -EINVAL;
72
73 pl = kzalloc(sizeof(*pl), GFP_KERNEL);
74 if (!pl)
75 return -ENOMEM;
76
77 pl->dev_id = dev_id;
78 pl->con_id = con_id;
79 pl->phy = phy;
80
81 mutex_lock(&phy_provider_mutex);
82 list_add_tail(&pl->node, &phys);
83 mutex_unlock(&phy_provider_mutex);
84
85 return 0;
86}
87EXPORT_SYMBOL_GPL(phy_create_lookup);
88
89/**
90 * phy_remove_lookup() - find and remove PHY/device association
91 * @phy: the phy of the association
92 * @con_id: connection ID string on device
93 * @dev_id: the device of the association
94 *
95 * Finds and unregisters phy_lookup entry that was created with
96 * phy_create_lookup().
97 */
98void phy_remove_lookup(struct phy *phy, const char *con_id, const char *dev_id)
99{
100 struct phy_lookup *pl;
101
102 if (!phy || !dev_id || !con_id)
103 return;
104
105 mutex_lock(&phy_provider_mutex);
106 list_for_each_entry(pl, &phys, node)
107 if (pl->phy == phy && !strcmp(pl->dev_id, dev_id) &&
108 !strcmp(pl->con_id, con_id)) {
109 list_del(&pl->node);
110 kfree(pl);
111 break;
112 }
113 mutex_unlock(&phy_provider_mutex);
114}
115EXPORT_SYMBOL_GPL(phy_remove_lookup);
116
117static struct phy *phy_find(struct device *dev, const char *con_id)
118{
119 const char *dev_id = dev_name(dev);
120 struct phy_lookup *p, *pl = NULL;
121
122 mutex_lock(&phy_provider_mutex);
123 list_for_each_entry(p, &phys, node)
124 if (!strcmp(p->dev_id, dev_id) && !strcmp(p->con_id, con_id)) {
125 pl = p;
126 break;
127 }
128 mutex_unlock(&phy_provider_mutex);
129
130 return pl ? pl->phy : ERR_PTR(-ENODEV);
131}
132
133static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
134{
135 struct phy_provider *phy_provider;
136 struct device_node *child;
137
138 list_for_each_entry(phy_provider, &phy_provider_list, list) {
139 if (phy_provider->dev->of_node == node)
140 return phy_provider;
141
142 for_each_child_of_node(phy_provider->children, child)
143 if (child == node)
144 return phy_provider;
145 }
146
147 return ERR_PTR(-EPROBE_DEFER);
148}
149
150int phy_pm_runtime_get(struct phy *phy)
151{
152 int ret;
153
154 if (!phy)
155 return 0;
156
157 if (!pm_runtime_enabled(&phy->dev))
158 return -ENOTSUPP;
159
160 ret = pm_runtime_get(&phy->dev);
161 if (ret < 0 && ret != -EINPROGRESS)
162 pm_runtime_put_noidle(&phy->dev);
163
164 return ret;
165}
166EXPORT_SYMBOL_GPL(phy_pm_runtime_get);
167
168int phy_pm_runtime_get_sync(struct phy *phy)
169{
170 int ret;
171
172 if (!phy)
173 return 0;
174
175 if (!pm_runtime_enabled(&phy->dev))
176 return -ENOTSUPP;
177
178 ret = pm_runtime_get_sync(&phy->dev);
179 if (ret < 0)
180 pm_runtime_put_sync(&phy->dev);
181
182 return ret;
183}
184EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync);
185
186int phy_pm_runtime_put(struct phy *phy)
187{
188 if (!phy)
189 return 0;
190
191 if (!pm_runtime_enabled(&phy->dev))
192 return -ENOTSUPP;
193
194 return pm_runtime_put(&phy->dev);
195}
196EXPORT_SYMBOL_GPL(phy_pm_runtime_put);
197
198int phy_pm_runtime_put_sync(struct phy *phy)
199{
200 if (!phy)
201 return 0;
202
203 if (!pm_runtime_enabled(&phy->dev))
204 return -ENOTSUPP;
205
206 return pm_runtime_put_sync(&phy->dev);
207}
208EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync);
209
210void phy_pm_runtime_allow(struct phy *phy)
211{
212 if (!phy)
213 return;
214
215 if (!pm_runtime_enabled(&phy->dev))
216 return;
217
218 pm_runtime_allow(&phy->dev);
219}
220EXPORT_SYMBOL_GPL(phy_pm_runtime_allow);
221
222void phy_pm_runtime_forbid(struct phy *phy)
223{
224 if (!phy)
225 return;
226
227 if (!pm_runtime_enabled(&phy->dev))
228 return;
229
230 pm_runtime_forbid(&phy->dev);
231}
232EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid);
233
234/**
235 * phy_init - phy internal initialization before phy operation
236 * @phy: the phy returned by phy_get()
237 *
238 * Used to allow phy's driver to perform phy internal initialization,
239 * such as PLL block powering, clock initialization or anything that's
240 * is required by the phy to perform the start of operation.
241 * Must be called before phy_power_on().
242 *
243 * Return: %0 if successful, a negative error code otherwise
244 */
245int phy_init(struct phy *phy)
246{
247 int ret;
248
249 if (!phy)
250 return 0;
251
252 ret = phy_pm_runtime_get_sync(phy);
253 if (ret < 0 && ret != -ENOTSUPP)
254 return ret;
255 ret = 0; /* Override possible ret == -ENOTSUPP */
256
257 mutex_lock(&phy->mutex);
258 if (phy->power_count > phy->init_count)
259 dev_warn(&phy->dev, "phy_power_on was called before phy_init\n");
260
261 if (phy->init_count == 0 && phy->ops->init) {
262 ret = phy->ops->init(phy);
263 if (ret < 0) {
264 dev_err(&phy->dev, "phy init failed --> %d\n", ret);
265 goto out;
266 }
267 }
268 ++phy->init_count;
269
270out:
271 mutex_unlock(&phy->mutex);
272 phy_pm_runtime_put(phy);
273 return ret;
274}
275EXPORT_SYMBOL_GPL(phy_init);
276
277/**
278 * phy_exit - Phy internal un-initialization
279 * @phy: the phy returned by phy_get()
280 *
281 * Must be called after phy_power_off().
282 *
283 * Return: %0 if successful, a negative error code otherwise
284 */
285int phy_exit(struct phy *phy)
286{
287 int ret;
288
289 if (!phy)
290 return 0;
291
292 ret = phy_pm_runtime_get_sync(phy);
293 if (ret < 0 && ret != -ENOTSUPP)
294 return ret;
295 ret = 0; /* Override possible ret == -ENOTSUPP */
296
297 mutex_lock(&phy->mutex);
298 if (phy->init_count == 1 && phy->ops->exit) {
299 ret = phy->ops->exit(phy);
300 if (ret < 0) {
301 dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
302 goto out;
303 }
304 }
305 --phy->init_count;
306
307out:
308 mutex_unlock(&phy->mutex);
309 phy_pm_runtime_put(phy);
310 return ret;
311}
312EXPORT_SYMBOL_GPL(phy_exit);
313
314/**
315 * phy_power_on - Enable the phy and enter proper operation
316 * @phy: the phy returned by phy_get()
317 *
318 * Must be called after phy_init().
319 *
320 * Return: %0 if successful, a negative error code otherwise
321 */
322int phy_power_on(struct phy *phy)
323{
324 int ret = 0;
325
326 if (!phy)
327 goto out;
328
329 if (phy->pwr) {
330 ret = regulator_enable(phy->pwr);
331 if (ret)
332 goto out;
333 }
334
335 ret = phy_pm_runtime_get_sync(phy);
336 if (ret < 0 && ret != -ENOTSUPP)
337 goto err_pm_sync;
338
339 ret = 0; /* Override possible ret == -ENOTSUPP */
340
341 mutex_lock(&phy->mutex);
342 if (phy->power_count == 0 && phy->ops->power_on) {
343 ret = phy->ops->power_on(phy);
344 if (ret < 0) {
345 dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
346 goto err_pwr_on;
347 }
348 }
349 ++phy->power_count;
350 mutex_unlock(&phy->mutex);
351 return 0;
352
353err_pwr_on:
354 mutex_unlock(&phy->mutex);
355 phy_pm_runtime_put_sync(phy);
356err_pm_sync:
357 if (phy->pwr)
358 regulator_disable(phy->pwr);
359out:
360 return ret;
361}
362EXPORT_SYMBOL_GPL(phy_power_on);
363
364/**
365 * phy_power_off - Disable the phy.
366 * @phy: the phy returned by phy_get()
367 *
368 * Must be called before phy_exit().
369 *
370 * Return: %0 if successful, a negative error code otherwise
371 */
372int phy_power_off(struct phy *phy)
373{
374 int ret;
375
376 if (!phy)
377 return 0;
378
379 mutex_lock(&phy->mutex);
380 if (phy->power_count == 1 && phy->ops->power_off) {
381 ret = phy->ops->power_off(phy);
382 if (ret < 0) {
383 dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
384 mutex_unlock(&phy->mutex);
385 return ret;
386 }
387 }
388 --phy->power_count;
389 mutex_unlock(&phy->mutex);
390 phy_pm_runtime_put(phy);
391
392 if (phy->pwr)
393 regulator_disable(phy->pwr);
394
395 return 0;
396}
397EXPORT_SYMBOL_GPL(phy_power_off);
398
399int phy_set_mode_ext(struct phy *phy, enum phy_mode mode, int submode)
400{
401 int ret;
402
403 if (!phy || !phy->ops->set_mode)
404 return 0;
405
406 mutex_lock(&phy->mutex);
407 ret = phy->ops->set_mode(phy, mode, submode);
408 if (!ret)
409 phy->attrs.mode = mode;
410 mutex_unlock(&phy->mutex);
411
412 return ret;
413}
414EXPORT_SYMBOL_GPL(phy_set_mode_ext);
415
416int phy_set_media(struct phy *phy, enum phy_media media)
417{
418 int ret;
419
420 if (!phy || !phy->ops->set_media)
421 return 0;
422
423 mutex_lock(&phy->mutex);
424 ret = phy->ops->set_media(phy, media);
425 mutex_unlock(&phy->mutex);
426
427 return ret;
428}
429EXPORT_SYMBOL_GPL(phy_set_media);
430
431int phy_set_speed(struct phy *phy, int speed)
432{
433 int ret;
434
435 if (!phy || !phy->ops->set_speed)
436 return 0;
437
438 mutex_lock(&phy->mutex);
439 ret = phy->ops->set_speed(phy, speed);
440 mutex_unlock(&phy->mutex);
441
442 return ret;
443}
444EXPORT_SYMBOL_GPL(phy_set_speed);
445
446int phy_reset(struct phy *phy)
447{
448 int ret;
449
450 if (!phy || !phy->ops->reset)
451 return 0;
452
453 ret = phy_pm_runtime_get_sync(phy);
454 if (ret < 0 && ret != -ENOTSUPP)
455 return ret;
456
457 mutex_lock(&phy->mutex);
458 ret = phy->ops->reset(phy);
459 mutex_unlock(&phy->mutex);
460
461 phy_pm_runtime_put(phy);
462
463 return ret;
464}
465EXPORT_SYMBOL_GPL(phy_reset);
466
467/**
468 * phy_calibrate() - Tunes the phy hw parameters for current configuration
469 * @phy: the phy returned by phy_get()
470 *
471 * Used to calibrate phy hardware, typically by adjusting some parameters in
472 * runtime, which are otherwise lost after host controller reset and cannot
473 * be applied in phy_init() or phy_power_on().
474 *
475 * Return: %0 if successful, a negative error code otherwise
476 */
477int phy_calibrate(struct phy *phy)
478{
479 int ret;
480
481 if (!phy || !phy->ops->calibrate)
482 return 0;
483
484 mutex_lock(&phy->mutex);
485 ret = phy->ops->calibrate(phy);
486 mutex_unlock(&phy->mutex);
487
488 return ret;
489}
490EXPORT_SYMBOL_GPL(phy_calibrate);
491
492/**
493 * phy_configure() - Changes the phy parameters
494 * @phy: the phy returned by phy_get()
495 * @opts: New configuration to apply
496 *
497 * Used to change the PHY parameters. phy_init() must have been called
498 * on the phy. The configuration will be applied on the current phy
499 * mode, that can be changed using phy_set_mode().
500 *
501 * Return: %0 if successful, a negative error code otherwise
502 */
503int phy_configure(struct phy *phy, union phy_configure_opts *opts)
504{
505 int ret;
506
507 if (!phy)
508 return -EINVAL;
509
510 if (!phy->ops->configure)
511 return -EOPNOTSUPP;
512
513 mutex_lock(&phy->mutex);
514 ret = phy->ops->configure(phy, opts);
515 mutex_unlock(&phy->mutex);
516
517 return ret;
518}
519EXPORT_SYMBOL_GPL(phy_configure);
520
521/**
522 * phy_validate() - Checks the phy parameters
523 * @phy: the phy returned by phy_get()
524 * @mode: phy_mode the configuration is applicable to.
525 * @submode: PHY submode the configuration is applicable to.
526 * @opts: Configuration to check
527 *
528 * Used to check that the current set of parameters can be handled by
529 * the phy. Implementations are free to tune the parameters passed as
530 * arguments if needed by some implementation detail or
531 * constraints. It will not change any actual configuration of the
532 * PHY, so calling it as many times as deemed fit will have no side
533 * effect.
534 *
535 * Return: %0 if successful, a negative error code otherwise
536 */
537int phy_validate(struct phy *phy, enum phy_mode mode, int submode,
538 union phy_configure_opts *opts)
539{
540 int ret;
541
542 if (!phy)
543 return -EINVAL;
544
545 if (!phy->ops->validate)
546 return -EOPNOTSUPP;
547
548 mutex_lock(&phy->mutex);
549 ret = phy->ops->validate(phy, mode, submode, opts);
550 mutex_unlock(&phy->mutex);
551
552 return ret;
553}
554EXPORT_SYMBOL_GPL(phy_validate);
555
556/**
557 * _of_phy_get() - lookup and obtain a reference to a phy by phandle
558 * @np: device_node for which to get the phy
559 * @index: the index of the phy
560 *
561 * Returns the phy associated with the given phandle value,
562 * after getting a refcount to it or -ENODEV if there is no such phy or
563 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
564 * not yet loaded. This function uses of_xlate call back function provided
565 * while registering the phy_provider to find the phy instance.
566 */
567static struct phy *_of_phy_get(struct device_node *np, int index)
568{
569 int ret;
570 struct phy_provider *phy_provider;
571 struct phy *phy = NULL;
572 struct of_phandle_args args;
573
574 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
575 index, &args);
576 if (ret)
577 return ERR_PTR(-ENODEV);
578
579 /* This phy type handled by the usb-phy subsystem for now */
580 if (of_device_is_compatible(args.np, "usb-nop-xceiv"))
581 return ERR_PTR(-ENODEV);
582
583 mutex_lock(&phy_provider_mutex);
584 phy_provider = of_phy_provider_lookup(args.np);
585 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
586 phy = ERR_PTR(-EPROBE_DEFER);
587 goto out_unlock;
588 }
589
590 if (!of_device_is_available(args.np)) {
591 dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
592 phy = ERR_PTR(-ENODEV);
593 goto out_put_module;
594 }
595
596 phy = phy_provider->of_xlate(phy_provider->dev, &args);
597
598out_put_module:
599 module_put(phy_provider->owner);
600
601out_unlock:
602 mutex_unlock(&phy_provider_mutex);
603 of_node_put(args.np);
604
605 return phy;
606}
607
608/**
609 * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
610 * @np: device_node for which to get the phy
611 * @con_id: name of the phy from device's point of view
612 *
613 * Returns the phy driver, after getting a refcount to it; or
614 * -ENODEV if there is no such phy. The caller is responsible for
615 * calling phy_put() to release that count.
616 */
617struct phy *of_phy_get(struct device_node *np, const char *con_id)
618{
619 struct phy *phy = NULL;
620 int index = 0;
621
622 if (con_id)
623 index = of_property_match_string(np, "phy-names", con_id);
624
625 phy = _of_phy_get(np, index);
626 if (IS_ERR(phy))
627 return phy;
628
629 if (!try_module_get(phy->ops->owner))
630 return ERR_PTR(-EPROBE_DEFER);
631
632 get_device(&phy->dev);
633
634 return phy;
635}
636EXPORT_SYMBOL_GPL(of_phy_get);
637
638/**
639 * of_phy_put() - release the PHY
640 * @phy: the phy returned by of_phy_get()
641 *
642 * Releases a refcount the caller received from of_phy_get().
643 */
644void of_phy_put(struct phy *phy)
645{
646 if (!phy || IS_ERR(phy))
647 return;
648
649 mutex_lock(&phy->mutex);
650 if (phy->ops->release)
651 phy->ops->release(phy);
652 mutex_unlock(&phy->mutex);
653
654 module_put(phy->ops->owner);
655 put_device(&phy->dev);
656}
657EXPORT_SYMBOL_GPL(of_phy_put);
658
659/**
660 * phy_put() - release the PHY
661 * @dev: device that wants to release this phy
662 * @phy: the phy returned by phy_get()
663 *
664 * Releases a refcount the caller received from phy_get().
665 */
666void phy_put(struct device *dev, struct phy *phy)
667{
668 device_link_remove(dev, &phy->dev);
669 of_phy_put(phy);
670}
671EXPORT_SYMBOL_GPL(phy_put);
672
673/**
674 * devm_phy_put() - release the PHY
675 * @dev: device that wants to release this phy
676 * @phy: the phy returned by devm_phy_get()
677 *
678 * destroys the devres associated with this phy and invokes phy_put
679 * to release the phy.
680 */
681void devm_phy_put(struct device *dev, struct phy *phy)
682{
683 int r;
684
685 if (!phy)
686 return;
687
688 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
689 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
690}
691EXPORT_SYMBOL_GPL(devm_phy_put);
692
693/**
694 * of_phy_simple_xlate() - returns the phy instance from phy provider
695 * @dev: the PHY provider device
696 * @args: of_phandle_args (not used here)
697 *
698 * Intended to be used by phy provider for the common case where #phy-cells is
699 * 0. For other cases where #phy-cells is greater than '0', the phy provider
700 * should provide a custom of_xlate function that reads the *args* and returns
701 * the appropriate phy.
702 */
703struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
704 *args)
705{
706 struct phy *phy;
707 struct class_dev_iter iter;
708
709 class_dev_iter_init(&iter, phy_class, NULL, NULL);
710 while ((dev = class_dev_iter_next(&iter))) {
711 phy = to_phy(dev);
712 if (args->np != phy->dev.of_node)
713 continue;
714
715 class_dev_iter_exit(&iter);
716 return phy;
717 }
718
719 class_dev_iter_exit(&iter);
720 return ERR_PTR(-ENODEV);
721}
722EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
723
724/**
725 * phy_get() - lookup and obtain a reference to a phy.
726 * @dev: device that requests this phy
727 * @string: the phy name as given in the dt data or the name of the controller
728 * port for non-dt case
729 *
730 * Returns the phy driver, after getting a refcount to it; or
731 * -ENODEV if there is no such phy. The caller is responsible for
732 * calling phy_put() to release that count.
733 */
734struct phy *phy_get(struct device *dev, const char *string)
735{
736 int index = 0;
737 struct phy *phy;
738 struct device_link *link;
739
740 if (dev->of_node) {
741 if (string)
742 index = of_property_match_string(dev->of_node, "phy-names",
743 string);
744 else
745 index = 0;
746 phy = _of_phy_get(dev->of_node, index);
747 } else {
748 if (string == NULL) {
749 dev_WARN(dev, "missing string\n");
750 return ERR_PTR(-EINVAL);
751 }
752 phy = phy_find(dev, string);
753 }
754 if (IS_ERR(phy))
755 return phy;
756
757 if (!try_module_get(phy->ops->owner))
758 return ERR_PTR(-EPROBE_DEFER);
759
760 get_device(&phy->dev);
761
762 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
763 if (!link)
764 dev_dbg(dev, "failed to create device link to %s\n",
765 dev_name(phy->dev.parent));
766
767 return phy;
768}
769EXPORT_SYMBOL_GPL(phy_get);
770
771/**
772 * devm_phy_get() - lookup and obtain a reference to a phy.
773 * @dev: device that requests this phy
774 * @string: the phy name as given in the dt data or phy device name
775 * for non-dt case
776 *
777 * Gets the phy using phy_get(), and associates a device with it using
778 * devres. On driver detach, release function is invoked on the devres data,
779 * then, devres data is freed.
780 */
781struct phy *devm_phy_get(struct device *dev, const char *string)
782{
783 struct phy **ptr, *phy;
784
785 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
786 if (!ptr)
787 return ERR_PTR(-ENOMEM);
788
789 phy = phy_get(dev, string);
790 if (!IS_ERR(phy)) {
791 *ptr = phy;
792 devres_add(dev, ptr);
793 } else {
794 devres_free(ptr);
795 }
796
797 return phy;
798}
799EXPORT_SYMBOL_GPL(devm_phy_get);
800
801/**
802 * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
803 * @dev: device that requests this phy
804 * @string: the phy name as given in the dt data or phy device name
805 * for non-dt case
806 *
807 * Gets the phy using phy_get(), and associates a device with it using
808 * devres. On driver detach, release function is invoked on the devres
809 * data, then, devres data is freed. This differs to devm_phy_get() in
810 * that if the phy does not exist, it is not considered an error and
811 * -ENODEV will not be returned. Instead the NULL phy is returned,
812 * which can be passed to all other phy consumer calls.
813 */
814struct phy *devm_phy_optional_get(struct device *dev, const char *string)
815{
816 struct phy *phy = devm_phy_get(dev, string);
817
818 if (PTR_ERR(phy) == -ENODEV)
819 phy = NULL;
820
821 return phy;
822}
823EXPORT_SYMBOL_GPL(devm_phy_optional_get);
824
825/**
826 * devm_of_phy_get() - lookup and obtain a reference to a phy.
827 * @dev: device that requests this phy
828 * @np: node containing the phy
829 * @con_id: name of the phy from device's point of view
830 *
831 * Gets the phy using of_phy_get(), and associates a device with it using
832 * devres. On driver detach, release function is invoked on the devres data,
833 * then, devres data is freed.
834 */
835struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
836 const char *con_id)
837{
838 struct phy **ptr, *phy;
839 struct device_link *link;
840
841 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
842 if (!ptr)
843 return ERR_PTR(-ENOMEM);
844
845 phy = of_phy_get(np, con_id);
846 if (!IS_ERR(phy)) {
847 *ptr = phy;
848 devres_add(dev, ptr);
849 } else {
850 devres_free(ptr);
851 return phy;
852 }
853
854 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
855 if (!link)
856 dev_dbg(dev, "failed to create device link to %s\n",
857 dev_name(phy->dev.parent));
858
859 return phy;
860}
861EXPORT_SYMBOL_GPL(devm_of_phy_get);
862
863/**
864 * devm_of_phy_optional_get() - lookup and obtain a reference to an optional
865 * phy.
866 * @dev: device that requests this phy
867 * @np: node containing the phy
868 * @con_id: name of the phy from device's point of view
869 *
870 * Gets the phy using of_phy_get(), and associates a device with it using
871 * devres. On driver detach, release function is invoked on the devres data,
872 * then, devres data is freed. This differs to devm_of_phy_get() in
873 * that if the phy does not exist, it is not considered an error and
874 * -ENODEV will not be returned. Instead the NULL phy is returned,
875 * which can be passed to all other phy consumer calls.
876 */
877struct phy *devm_of_phy_optional_get(struct device *dev, struct device_node *np,
878 const char *con_id)
879{
880 struct phy *phy = devm_of_phy_get(dev, np, con_id);
881
882 if (PTR_ERR(phy) == -ENODEV)
883 phy = NULL;
884
885 if (IS_ERR(phy))
886 dev_err_probe(dev, PTR_ERR(phy), "failed to get PHY %pOF:%s",
887 np, con_id);
888
889 return phy;
890}
891EXPORT_SYMBOL_GPL(devm_of_phy_optional_get);
892
893/**
894 * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
895 * @dev: device that requests this phy
896 * @np: node containing the phy
897 * @index: index of the phy
898 *
899 * Gets the phy using _of_phy_get(), then gets a refcount to it,
900 * and associates a device with it using devres. On driver detach,
901 * release function is invoked on the devres data,
902 * then, devres data is freed.
903 *
904 */
905struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
906 int index)
907{
908 struct phy **ptr, *phy;
909 struct device_link *link;
910
911 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
912 if (!ptr)
913 return ERR_PTR(-ENOMEM);
914
915 phy = _of_phy_get(np, index);
916 if (IS_ERR(phy)) {
917 devres_free(ptr);
918 return phy;
919 }
920
921 if (!try_module_get(phy->ops->owner)) {
922 devres_free(ptr);
923 return ERR_PTR(-EPROBE_DEFER);
924 }
925
926 get_device(&phy->dev);
927
928 *ptr = phy;
929 devres_add(dev, ptr);
930
931 link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
932 if (!link)
933 dev_dbg(dev, "failed to create device link to %s\n",
934 dev_name(phy->dev.parent));
935
936 return phy;
937}
938EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
939
940/**
941 * phy_create() - create a new phy
942 * @dev: device that is creating the new phy
943 * @node: device node of the phy
944 * @ops: function pointers for performing phy operations
945 *
946 * Called to create a phy using phy framework.
947 */
948struct phy *phy_create(struct device *dev, struct device_node *node,
949 const struct phy_ops *ops)
950{
951 int ret;
952 int id;
953 struct phy *phy;
954
955 if (WARN_ON(!dev))
956 return ERR_PTR(-EINVAL);
957
958 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
959 if (!phy)
960 return ERR_PTR(-ENOMEM);
961
962 id = ida_alloc(&phy_ida, GFP_KERNEL);
963 if (id < 0) {
964 dev_err(dev, "unable to get id\n");
965 ret = id;
966 goto free_phy;
967 }
968
969 device_initialize(&phy->dev);
970 mutex_init(&phy->mutex);
971
972 phy->dev.class = phy_class;
973 phy->dev.parent = dev;
974 phy->dev.of_node = node ?: dev->of_node;
975 phy->id = id;
976 phy->ops = ops;
977
978 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
979 if (ret)
980 goto put_dev;
981
982 /* phy-supply */
983 phy->pwr = regulator_get_optional(&phy->dev, "phy");
984 if (IS_ERR(phy->pwr)) {
985 ret = PTR_ERR(phy->pwr);
986 if (ret == -EPROBE_DEFER)
987 goto put_dev;
988
989 phy->pwr = NULL;
990 }
991
992 ret = device_add(&phy->dev);
993 if (ret)
994 goto put_dev;
995
996 if (pm_runtime_enabled(dev)) {
997 pm_runtime_enable(&phy->dev);
998 pm_runtime_no_callbacks(&phy->dev);
999 }
1000
1001 phy->debugfs = debugfs_create_dir(dev_name(&phy->dev), phy_debugfs_root);
1002
1003 return phy;
1004
1005put_dev:
1006 put_device(&phy->dev); /* calls phy_release() which frees resources */
1007 return ERR_PTR(ret);
1008
1009free_phy:
1010 kfree(phy);
1011 return ERR_PTR(ret);
1012}
1013EXPORT_SYMBOL_GPL(phy_create);
1014
1015/**
1016 * devm_phy_create() - create a new phy
1017 * @dev: device that is creating the new phy
1018 * @node: device node of the phy
1019 * @ops: function pointers for performing phy operations
1020 *
1021 * Creates a new PHY device adding it to the PHY class.
1022 * While at that, it also associates the device with the phy using devres.
1023 * On driver detach, release function is invoked on the devres data,
1024 * then, devres data is freed.
1025 */
1026struct phy *devm_phy_create(struct device *dev, struct device_node *node,
1027 const struct phy_ops *ops)
1028{
1029 struct phy **ptr, *phy;
1030
1031 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
1032 if (!ptr)
1033 return ERR_PTR(-ENOMEM);
1034
1035 phy = phy_create(dev, node, ops);
1036 if (!IS_ERR(phy)) {
1037 *ptr = phy;
1038 devres_add(dev, ptr);
1039 } else {
1040 devres_free(ptr);
1041 }
1042
1043 return phy;
1044}
1045EXPORT_SYMBOL_GPL(devm_phy_create);
1046
1047/**
1048 * phy_destroy() - destroy the phy
1049 * @phy: the phy to be destroyed
1050 *
1051 * Called to destroy the phy.
1052 */
1053void phy_destroy(struct phy *phy)
1054{
1055 pm_runtime_disable(&phy->dev);
1056 device_unregister(&phy->dev);
1057}
1058EXPORT_SYMBOL_GPL(phy_destroy);
1059
1060/**
1061 * devm_phy_destroy() - destroy the PHY
1062 * @dev: device that wants to release this phy
1063 * @phy: the phy returned by devm_phy_get()
1064 *
1065 * destroys the devres associated with this phy and invokes phy_destroy
1066 * to destroy the phy.
1067 */
1068void devm_phy_destroy(struct device *dev, struct phy *phy)
1069{
1070 int r;
1071
1072 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
1073 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
1074}
1075EXPORT_SYMBOL_GPL(devm_phy_destroy);
1076
1077/**
1078 * __of_phy_provider_register() - create/register phy provider with the framework
1079 * @dev: struct device of the phy provider
1080 * @children: device node containing children (if different from dev->of_node)
1081 * @owner: the module owner containing of_xlate
1082 * @of_xlate: function pointer to obtain phy instance from phy provider
1083 *
1084 * Creates struct phy_provider from dev and of_xlate function pointer.
1085 * This is used in the case of dt boot for finding the phy instance from
1086 * phy provider.
1087 *
1088 * If the PHY provider doesn't nest children directly but uses a separate
1089 * child node to contain the individual children, the @children parameter
1090 * can be used to override the default. If NULL, the default (dev->of_node)
1091 * will be used. If non-NULL, the device node must be a child (or further
1092 * descendant) of dev->of_node. Otherwise an ERR_PTR()-encoded -EINVAL
1093 * error code is returned.
1094 */
1095struct phy_provider *__of_phy_provider_register(struct device *dev,
1096 struct device_node *children, struct module *owner,
1097 struct phy * (*of_xlate)(struct device *dev,
1098 struct of_phandle_args *args))
1099{
1100 struct phy_provider *phy_provider;
1101
1102 /*
1103 * If specified, the device node containing the children must itself
1104 * be the provider's device node or a child (or further descendant)
1105 * thereof.
1106 */
1107 if (children) {
1108 struct device_node *parent = of_node_get(children), *next;
1109
1110 while (parent) {
1111 if (parent == dev->of_node)
1112 break;
1113
1114 next = of_get_parent(parent);
1115 of_node_put(parent);
1116 parent = next;
1117 }
1118
1119 if (!parent)
1120 return ERR_PTR(-EINVAL);
1121
1122 of_node_put(parent);
1123 } else {
1124 children = dev->of_node;
1125 }
1126
1127 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
1128 if (!phy_provider)
1129 return ERR_PTR(-ENOMEM);
1130
1131 phy_provider->dev = dev;
1132 phy_provider->children = of_node_get(children);
1133 phy_provider->owner = owner;
1134 phy_provider->of_xlate = of_xlate;
1135
1136 mutex_lock(&phy_provider_mutex);
1137 list_add_tail(&phy_provider->list, &phy_provider_list);
1138 mutex_unlock(&phy_provider_mutex);
1139
1140 return phy_provider;
1141}
1142EXPORT_SYMBOL_GPL(__of_phy_provider_register);
1143
1144/**
1145 * __devm_of_phy_provider_register() - create/register phy provider with the
1146 * framework
1147 * @dev: struct device of the phy provider
1148 * @children: device node containing children (if different from dev->of_node)
1149 * @owner: the module owner containing of_xlate
1150 * @of_xlate: function pointer to obtain phy instance from phy provider
1151 *
1152 * Creates struct phy_provider from dev and of_xlate function pointer.
1153 * This is used in the case of dt boot for finding the phy instance from
1154 * phy provider. While at that, it also associates the device with the
1155 * phy provider using devres. On driver detach, release function is invoked
1156 * on the devres data, then, devres data is freed.
1157 */
1158struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
1159 struct device_node *children, struct module *owner,
1160 struct phy * (*of_xlate)(struct device *dev,
1161 struct of_phandle_args *args))
1162{
1163 struct phy_provider **ptr, *phy_provider;
1164
1165 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
1166 if (!ptr)
1167 return ERR_PTR(-ENOMEM);
1168
1169 phy_provider = __of_phy_provider_register(dev, children, owner,
1170 of_xlate);
1171 if (!IS_ERR(phy_provider)) {
1172 *ptr = phy_provider;
1173 devres_add(dev, ptr);
1174 } else {
1175 devres_free(ptr);
1176 }
1177
1178 return phy_provider;
1179}
1180EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);
1181
1182/**
1183 * of_phy_provider_unregister() - unregister phy provider from the framework
1184 * @phy_provider: phy provider returned by of_phy_provider_register()
1185 *
1186 * Removes the phy_provider created using of_phy_provider_register().
1187 */
1188void of_phy_provider_unregister(struct phy_provider *phy_provider)
1189{
1190 if (IS_ERR(phy_provider))
1191 return;
1192
1193 mutex_lock(&phy_provider_mutex);
1194 list_del(&phy_provider->list);
1195 of_node_put(phy_provider->children);
1196 kfree(phy_provider);
1197 mutex_unlock(&phy_provider_mutex);
1198}
1199EXPORT_SYMBOL_GPL(of_phy_provider_unregister);
1200
1201/**
1202 * devm_of_phy_provider_unregister() - remove phy provider from the framework
1203 * @dev: struct device of the phy provider
1204 * @phy_provider: phy provider returned by of_phy_provider_register()
1205 *
1206 * destroys the devres associated with this phy provider and invokes
1207 * of_phy_provider_unregister to unregister the phy provider.
1208 */
1209void devm_of_phy_provider_unregister(struct device *dev,
1210 struct phy_provider *phy_provider)
1211{
1212 int r;
1213
1214 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
1215 phy_provider);
1216 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
1217}
1218EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
1219
1220/**
1221 * phy_release() - release the phy
1222 * @dev: the dev member within phy
1223 *
1224 * When the last reference to the device is removed, it is called
1225 * from the embedded kobject as release method.
1226 */
1227static void phy_release(struct device *dev)
1228{
1229 struct phy *phy;
1230
1231 phy = to_phy(dev);
1232 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
1233 debugfs_remove_recursive(phy->debugfs);
1234 regulator_put(phy->pwr);
1235 ida_free(&phy_ida, phy->id);
1236 kfree(phy);
1237}
1238
1239static int __init phy_core_init(void)
1240{
1241 phy_class = class_create("phy");
1242 if (IS_ERR(phy_class)) {
1243 pr_err("failed to create phy class --> %ld\n",
1244 PTR_ERR(phy_class));
1245 return PTR_ERR(phy_class);
1246 }
1247
1248 phy_class->dev_release = phy_release;
1249
1250 phy_debugfs_root = debugfs_create_dir("phy", NULL);
1251
1252 return 0;
1253}
1254device_initcall(phy_core_init);
1255
1256static void __exit phy_core_exit(void)
1257{
1258 debugfs_remove_recursive(phy_debugfs_root);
1259 class_destroy(phy_class);
1260}
1261module_exit(phy_core_exit);