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1/*
2 * phy-core.c -- Generic Phy framework.
3 *
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
5 *
6 * Author: Kishon Vijay Abraham I <kishon@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/kernel.h>
15#include <linux/export.h>
16#include <linux/module.h>
17#include <linux/err.h>
18#include <linux/device.h>
19#include <linux/slab.h>
20#include <linux/of.h>
21#include <linux/phy/phy.h>
22#include <linux/idr.h>
23#include <linux/pm_runtime.h>
24#include <linux/regulator/consumer.h>
25
26static struct class *phy_class;
27static DEFINE_MUTEX(phy_provider_mutex);
28static LIST_HEAD(phy_provider_list);
29static LIST_HEAD(phys);
30static DEFINE_IDA(phy_ida);
31
32static void devm_phy_release(struct device *dev, void *res)
33{
34 struct phy *phy = *(struct phy **)res;
35
36 phy_put(phy);
37}
38
39static void devm_phy_provider_release(struct device *dev, void *res)
40{
41 struct phy_provider *phy_provider = *(struct phy_provider **)res;
42
43 of_phy_provider_unregister(phy_provider);
44}
45
46static void devm_phy_consume(struct device *dev, void *res)
47{
48 struct phy *phy = *(struct phy **)res;
49
50 phy_destroy(phy);
51}
52
53static int devm_phy_match(struct device *dev, void *res, void *match_data)
54{
55 struct phy **phy = res;
56
57 return *phy == match_data;
58}
59
60/**
61 * phy_create_lookup() - allocate and register PHY/device association
62 * @phy: the phy of the association
63 * @con_id: connection ID string on device
64 * @dev_id: the device of the association
65 *
66 * Creates and registers phy_lookup entry.
67 */
68int phy_create_lookup(struct phy *phy, const char *con_id, const char *dev_id)
69{
70 struct phy_lookup *pl;
71
72 if (!phy || !dev_id || !con_id)
73 return -EINVAL;
74
75 pl = kzalloc(sizeof(*pl), GFP_KERNEL);
76 if (!pl)
77 return -ENOMEM;
78
79 pl->dev_id = dev_id;
80 pl->con_id = con_id;
81 pl->phy = phy;
82
83 mutex_lock(&phy_provider_mutex);
84 list_add_tail(&pl->node, &phys);
85 mutex_unlock(&phy_provider_mutex);
86
87 return 0;
88}
89EXPORT_SYMBOL_GPL(phy_create_lookup);
90
91/**
92 * phy_remove_lookup() - find and remove PHY/device association
93 * @phy: the phy of the association
94 * @con_id: connection ID string on device
95 * @dev_id: the device of the association
96 *
97 * Finds and unregisters phy_lookup entry that was created with
98 * phy_create_lookup().
99 */
100void phy_remove_lookup(struct phy *phy, const char *con_id, const char *dev_id)
101{
102 struct phy_lookup *pl;
103
104 if (!phy || !dev_id || !con_id)
105 return;
106
107 mutex_lock(&phy_provider_mutex);
108 list_for_each_entry(pl, &phys, node)
109 if (pl->phy == phy && !strcmp(pl->dev_id, dev_id) &&
110 !strcmp(pl->con_id, con_id)) {
111 list_del(&pl->node);
112 kfree(pl);
113 break;
114 }
115 mutex_unlock(&phy_provider_mutex);
116}
117EXPORT_SYMBOL_GPL(phy_remove_lookup);
118
119static struct phy *phy_find(struct device *dev, const char *con_id)
120{
121 const char *dev_id = dev_name(dev);
122 struct phy_lookup *p, *pl = NULL;
123
124 mutex_lock(&phy_provider_mutex);
125 list_for_each_entry(p, &phys, node)
126 if (!strcmp(p->dev_id, dev_id) && !strcmp(p->con_id, con_id)) {
127 pl = p;
128 break;
129 }
130 mutex_unlock(&phy_provider_mutex);
131
132 return pl ? pl->phy : ERR_PTR(-ENODEV);
133}
134
135static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
136{
137 struct phy_provider *phy_provider;
138 struct device_node *child;
139
140 list_for_each_entry(phy_provider, &phy_provider_list, list) {
141 if (phy_provider->dev->of_node == node)
142 return phy_provider;
143
144 for_each_child_of_node(phy_provider->children, child)
145 if (child == node)
146 return phy_provider;
147 }
148
149 return ERR_PTR(-EPROBE_DEFER);
150}
151
152int phy_pm_runtime_get(struct phy *phy)
153{
154 int ret;
155
156 if (!pm_runtime_enabled(&phy->dev))
157 return -ENOTSUPP;
158
159 ret = pm_runtime_get(&phy->dev);
160 if (ret < 0 && ret != -EINPROGRESS)
161 pm_runtime_put_noidle(&phy->dev);
162
163 return ret;
164}
165EXPORT_SYMBOL_GPL(phy_pm_runtime_get);
166
167int phy_pm_runtime_get_sync(struct phy *phy)
168{
169 int ret;
170
171 if (!pm_runtime_enabled(&phy->dev))
172 return -ENOTSUPP;
173
174 ret = pm_runtime_get_sync(&phy->dev);
175 if (ret < 0)
176 pm_runtime_put_sync(&phy->dev);
177
178 return ret;
179}
180EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync);
181
182int phy_pm_runtime_put(struct phy *phy)
183{
184 if (!pm_runtime_enabled(&phy->dev))
185 return -ENOTSUPP;
186
187 return pm_runtime_put(&phy->dev);
188}
189EXPORT_SYMBOL_GPL(phy_pm_runtime_put);
190
191int phy_pm_runtime_put_sync(struct phy *phy)
192{
193 if (!pm_runtime_enabled(&phy->dev))
194 return -ENOTSUPP;
195
196 return pm_runtime_put_sync(&phy->dev);
197}
198EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync);
199
200void phy_pm_runtime_allow(struct phy *phy)
201{
202 if (!pm_runtime_enabled(&phy->dev))
203 return;
204
205 pm_runtime_allow(&phy->dev);
206}
207EXPORT_SYMBOL_GPL(phy_pm_runtime_allow);
208
209void phy_pm_runtime_forbid(struct phy *phy)
210{
211 if (!pm_runtime_enabled(&phy->dev))
212 return;
213
214 pm_runtime_forbid(&phy->dev);
215}
216EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid);
217
218int phy_init(struct phy *phy)
219{
220 int ret;
221
222 if (!phy)
223 return 0;
224
225 ret = phy_pm_runtime_get_sync(phy);
226 if (ret < 0 && ret != -ENOTSUPP)
227 return ret;
228 ret = 0; /* Override possible ret == -ENOTSUPP */
229
230 mutex_lock(&phy->mutex);
231 if (phy->init_count == 0 && phy->ops->init) {
232 ret = phy->ops->init(phy);
233 if (ret < 0) {
234 dev_err(&phy->dev, "phy init failed --> %d\n", ret);
235 goto out;
236 }
237 }
238 ++phy->init_count;
239
240out:
241 mutex_unlock(&phy->mutex);
242 phy_pm_runtime_put(phy);
243 return ret;
244}
245EXPORT_SYMBOL_GPL(phy_init);
246
247int phy_exit(struct phy *phy)
248{
249 int ret;
250
251 if (!phy)
252 return 0;
253
254 ret = phy_pm_runtime_get_sync(phy);
255 if (ret < 0 && ret != -ENOTSUPP)
256 return ret;
257 ret = 0; /* Override possible ret == -ENOTSUPP */
258
259 mutex_lock(&phy->mutex);
260 if (phy->init_count == 1 && phy->ops->exit) {
261 ret = phy->ops->exit(phy);
262 if (ret < 0) {
263 dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
264 goto out;
265 }
266 }
267 --phy->init_count;
268
269out:
270 mutex_unlock(&phy->mutex);
271 phy_pm_runtime_put(phy);
272 return ret;
273}
274EXPORT_SYMBOL_GPL(phy_exit);
275
276int phy_power_on(struct phy *phy)
277{
278 int ret = 0;
279
280 if (!phy)
281 goto out;
282
283 if (phy->pwr) {
284 ret = regulator_enable(phy->pwr);
285 if (ret)
286 goto out;
287 }
288
289 ret = phy_pm_runtime_get_sync(phy);
290 if (ret < 0 && ret != -ENOTSUPP)
291 goto err_pm_sync;
292
293 ret = 0; /* Override possible ret == -ENOTSUPP */
294
295 mutex_lock(&phy->mutex);
296 if (phy->power_count == 0 && phy->ops->power_on) {
297 ret = phy->ops->power_on(phy);
298 if (ret < 0) {
299 dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
300 goto err_pwr_on;
301 }
302 }
303 ++phy->power_count;
304 mutex_unlock(&phy->mutex);
305 return 0;
306
307err_pwr_on:
308 mutex_unlock(&phy->mutex);
309 phy_pm_runtime_put_sync(phy);
310err_pm_sync:
311 if (phy->pwr)
312 regulator_disable(phy->pwr);
313out:
314 return ret;
315}
316EXPORT_SYMBOL_GPL(phy_power_on);
317
318int phy_power_off(struct phy *phy)
319{
320 int ret;
321
322 if (!phy)
323 return 0;
324
325 mutex_lock(&phy->mutex);
326 if (phy->power_count == 1 && phy->ops->power_off) {
327 ret = phy->ops->power_off(phy);
328 if (ret < 0) {
329 dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
330 mutex_unlock(&phy->mutex);
331 return ret;
332 }
333 }
334 --phy->power_count;
335 mutex_unlock(&phy->mutex);
336 phy_pm_runtime_put(phy);
337
338 if (phy->pwr)
339 regulator_disable(phy->pwr);
340
341 return 0;
342}
343EXPORT_SYMBOL_GPL(phy_power_off);
344
345int phy_set_mode(struct phy *phy, enum phy_mode mode)
346{
347 int ret;
348
349 if (!phy || !phy->ops->set_mode)
350 return 0;
351
352 mutex_lock(&phy->mutex);
353 ret = phy->ops->set_mode(phy, mode);
354 if (!ret)
355 phy->attrs.mode = mode;
356 mutex_unlock(&phy->mutex);
357
358 return ret;
359}
360EXPORT_SYMBOL_GPL(phy_set_mode);
361
362int phy_reset(struct phy *phy)
363{
364 int ret;
365
366 if (!phy || !phy->ops->reset)
367 return 0;
368
369 mutex_lock(&phy->mutex);
370 ret = phy->ops->reset(phy);
371 mutex_unlock(&phy->mutex);
372
373 return ret;
374}
375EXPORT_SYMBOL_GPL(phy_reset);
376
377int phy_calibrate(struct phy *phy)
378{
379 int ret;
380
381 if (!phy || !phy->ops->calibrate)
382 return 0;
383
384 mutex_lock(&phy->mutex);
385 ret = phy->ops->calibrate(phy);
386 mutex_unlock(&phy->mutex);
387
388 return ret;
389}
390EXPORT_SYMBOL_GPL(phy_calibrate);
391
392/**
393 * _of_phy_get() - lookup and obtain a reference to a phy by phandle
394 * @np: device_node for which to get the phy
395 * @index: the index of the phy
396 *
397 * Returns the phy associated with the given phandle value,
398 * after getting a refcount to it or -ENODEV if there is no such phy or
399 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
400 * not yet loaded. This function uses of_xlate call back function provided
401 * while registering the phy_provider to find the phy instance.
402 */
403static struct phy *_of_phy_get(struct device_node *np, int index)
404{
405 int ret;
406 struct phy_provider *phy_provider;
407 struct phy *phy = NULL;
408 struct of_phandle_args args;
409
410 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
411 index, &args);
412 if (ret)
413 return ERR_PTR(-ENODEV);
414
415 /* This phy type handled by the usb-phy subsystem for now */
416 if (of_device_is_compatible(args.np, "usb-nop-xceiv"))
417 return ERR_PTR(-ENODEV);
418
419 mutex_lock(&phy_provider_mutex);
420 phy_provider = of_phy_provider_lookup(args.np);
421 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
422 phy = ERR_PTR(-EPROBE_DEFER);
423 goto out_unlock;
424 }
425
426 if (!of_device_is_available(args.np)) {
427 dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
428 phy = ERR_PTR(-ENODEV);
429 goto out_put_module;
430 }
431
432 phy = phy_provider->of_xlate(phy_provider->dev, &args);
433
434out_put_module:
435 module_put(phy_provider->owner);
436
437out_unlock:
438 mutex_unlock(&phy_provider_mutex);
439 of_node_put(args.np);
440
441 return phy;
442}
443
444/**
445 * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
446 * @np: device_node for which to get the phy
447 * @con_id: name of the phy from device's point of view
448 *
449 * Returns the phy driver, after getting a refcount to it; or
450 * -ENODEV if there is no such phy. The caller is responsible for
451 * calling phy_put() to release that count.
452 */
453struct phy *of_phy_get(struct device_node *np, const char *con_id)
454{
455 struct phy *phy = NULL;
456 int index = 0;
457
458 if (con_id)
459 index = of_property_match_string(np, "phy-names", con_id);
460
461 phy = _of_phy_get(np, index);
462 if (IS_ERR(phy))
463 return phy;
464
465 if (!try_module_get(phy->ops->owner))
466 return ERR_PTR(-EPROBE_DEFER);
467
468 get_device(&phy->dev);
469
470 return phy;
471}
472EXPORT_SYMBOL_GPL(of_phy_get);
473
474/**
475 * phy_put() - release the PHY
476 * @phy: the phy returned by phy_get()
477 *
478 * Releases a refcount the caller received from phy_get().
479 */
480void phy_put(struct phy *phy)
481{
482 if (!phy || IS_ERR(phy))
483 return;
484
485 module_put(phy->ops->owner);
486 put_device(&phy->dev);
487}
488EXPORT_SYMBOL_GPL(phy_put);
489
490/**
491 * devm_phy_put() - release the PHY
492 * @dev: device that wants to release this phy
493 * @phy: the phy returned by devm_phy_get()
494 *
495 * destroys the devres associated with this phy and invokes phy_put
496 * to release the phy.
497 */
498void devm_phy_put(struct device *dev, struct phy *phy)
499{
500 int r;
501
502 if (!phy)
503 return;
504
505 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
506 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
507}
508EXPORT_SYMBOL_GPL(devm_phy_put);
509
510/**
511 * of_phy_simple_xlate() - returns the phy instance from phy provider
512 * @dev: the PHY provider device
513 * @args: of_phandle_args (not used here)
514 *
515 * Intended to be used by phy provider for the common case where #phy-cells is
516 * 0. For other cases where #phy-cells is greater than '0', the phy provider
517 * should provide a custom of_xlate function that reads the *args* and returns
518 * the appropriate phy.
519 */
520struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
521 *args)
522{
523 struct phy *phy;
524 struct class_dev_iter iter;
525
526 class_dev_iter_init(&iter, phy_class, NULL, NULL);
527 while ((dev = class_dev_iter_next(&iter))) {
528 phy = to_phy(dev);
529 if (args->np != phy->dev.of_node)
530 continue;
531
532 class_dev_iter_exit(&iter);
533 return phy;
534 }
535
536 class_dev_iter_exit(&iter);
537 return ERR_PTR(-ENODEV);
538}
539EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
540
541/**
542 * phy_get() - lookup and obtain a reference to a phy.
543 * @dev: device that requests this phy
544 * @string: the phy name as given in the dt data or the name of the controller
545 * port for non-dt case
546 *
547 * Returns the phy driver, after getting a refcount to it; or
548 * -ENODEV if there is no such phy. The caller is responsible for
549 * calling phy_put() to release that count.
550 */
551struct phy *phy_get(struct device *dev, const char *string)
552{
553 int index = 0;
554 struct phy *phy;
555
556 if (string == NULL) {
557 dev_WARN(dev, "missing string\n");
558 return ERR_PTR(-EINVAL);
559 }
560
561 if (dev->of_node) {
562 index = of_property_match_string(dev->of_node, "phy-names",
563 string);
564 phy = _of_phy_get(dev->of_node, index);
565 } else {
566 phy = phy_find(dev, string);
567 }
568 if (IS_ERR(phy))
569 return phy;
570
571 if (!try_module_get(phy->ops->owner))
572 return ERR_PTR(-EPROBE_DEFER);
573
574 get_device(&phy->dev);
575
576 return phy;
577}
578EXPORT_SYMBOL_GPL(phy_get);
579
580/**
581 * phy_optional_get() - lookup and obtain a reference to an optional phy.
582 * @dev: device that requests this phy
583 * @string: the phy name as given in the dt data or the name of the controller
584 * port for non-dt case
585 *
586 * Returns the phy driver, after getting a refcount to it; or
587 * NULL if there is no such phy. The caller is responsible for
588 * calling phy_put() to release that count.
589 */
590struct phy *phy_optional_get(struct device *dev, const char *string)
591{
592 struct phy *phy = phy_get(dev, string);
593
594 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV))
595 phy = NULL;
596
597 return phy;
598}
599EXPORT_SYMBOL_GPL(phy_optional_get);
600
601/**
602 * devm_phy_get() - lookup and obtain a reference to a phy.
603 * @dev: device that requests this phy
604 * @string: the phy name as given in the dt data or phy device name
605 * for non-dt case
606 *
607 * Gets the phy using phy_get(), and associates a device with it using
608 * devres. On driver detach, release function is invoked on the devres data,
609 * then, devres data is freed.
610 */
611struct phy *devm_phy_get(struct device *dev, const char *string)
612{
613 struct phy **ptr, *phy;
614
615 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
616 if (!ptr)
617 return ERR_PTR(-ENOMEM);
618
619 phy = phy_get(dev, string);
620 if (!IS_ERR(phy)) {
621 *ptr = phy;
622 devres_add(dev, ptr);
623 } else {
624 devres_free(ptr);
625 }
626
627 return phy;
628}
629EXPORT_SYMBOL_GPL(devm_phy_get);
630
631/**
632 * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
633 * @dev: device that requests this phy
634 * @string: the phy name as given in the dt data or phy device name
635 * for non-dt case
636 *
637 * Gets the phy using phy_get(), and associates a device with it using
638 * devres. On driver detach, release function is invoked on the devres
639 * data, then, devres data is freed. This differs to devm_phy_get() in
640 * that if the phy does not exist, it is not considered an error and
641 * -ENODEV will not be returned. Instead the NULL phy is returned,
642 * which can be passed to all other phy consumer calls.
643 */
644struct phy *devm_phy_optional_get(struct device *dev, const char *string)
645{
646 struct phy *phy = devm_phy_get(dev, string);
647
648 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV))
649 phy = NULL;
650
651 return phy;
652}
653EXPORT_SYMBOL_GPL(devm_phy_optional_get);
654
655/**
656 * devm_of_phy_get() - lookup and obtain a reference to a phy.
657 * @dev: device that requests this phy
658 * @np: node containing the phy
659 * @con_id: name of the phy from device's point of view
660 *
661 * Gets the phy using of_phy_get(), and associates a device with it using
662 * devres. On driver detach, release function is invoked on the devres data,
663 * then, devres data is freed.
664 */
665struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
666 const char *con_id)
667{
668 struct phy **ptr, *phy;
669
670 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
671 if (!ptr)
672 return ERR_PTR(-ENOMEM);
673
674 phy = of_phy_get(np, con_id);
675 if (!IS_ERR(phy)) {
676 *ptr = phy;
677 devres_add(dev, ptr);
678 } else {
679 devres_free(ptr);
680 }
681
682 return phy;
683}
684EXPORT_SYMBOL_GPL(devm_of_phy_get);
685
686/**
687 * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
688 * @dev: device that requests this phy
689 * @np: node containing the phy
690 * @index: index of the phy
691 *
692 * Gets the phy using _of_phy_get(), then gets a refcount to it,
693 * and associates a device with it using devres. On driver detach,
694 * release function is invoked on the devres data,
695 * then, devres data is freed.
696 *
697 */
698struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
699 int index)
700{
701 struct phy **ptr, *phy;
702
703 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
704 if (!ptr)
705 return ERR_PTR(-ENOMEM);
706
707 phy = _of_phy_get(np, index);
708 if (IS_ERR(phy)) {
709 devres_free(ptr);
710 return phy;
711 }
712
713 if (!try_module_get(phy->ops->owner)) {
714 devres_free(ptr);
715 return ERR_PTR(-EPROBE_DEFER);
716 }
717
718 get_device(&phy->dev);
719
720 *ptr = phy;
721 devres_add(dev, ptr);
722
723 return phy;
724}
725EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
726
727/**
728 * phy_create() - create a new phy
729 * @dev: device that is creating the new phy
730 * @node: device node of the phy
731 * @ops: function pointers for performing phy operations
732 *
733 * Called to create a phy using phy framework.
734 */
735struct phy *phy_create(struct device *dev, struct device_node *node,
736 const struct phy_ops *ops)
737{
738 int ret;
739 int id;
740 struct phy *phy;
741
742 if (WARN_ON(!dev))
743 return ERR_PTR(-EINVAL);
744
745 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
746 if (!phy)
747 return ERR_PTR(-ENOMEM);
748
749 id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
750 if (id < 0) {
751 dev_err(dev, "unable to get id\n");
752 ret = id;
753 goto free_phy;
754 }
755
756 device_initialize(&phy->dev);
757 mutex_init(&phy->mutex);
758
759 phy->dev.class = phy_class;
760 phy->dev.parent = dev;
761 phy->dev.of_node = node ?: dev->of_node;
762 phy->id = id;
763 phy->ops = ops;
764
765 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
766 if (ret)
767 goto put_dev;
768
769 /* phy-supply */
770 phy->pwr = regulator_get_optional(&phy->dev, "phy");
771 if (IS_ERR(phy->pwr)) {
772 ret = PTR_ERR(phy->pwr);
773 if (ret == -EPROBE_DEFER)
774 goto put_dev;
775
776 phy->pwr = NULL;
777 }
778
779 ret = device_add(&phy->dev);
780 if (ret)
781 goto put_dev;
782
783 if (pm_runtime_enabled(dev)) {
784 pm_runtime_enable(&phy->dev);
785 pm_runtime_no_callbacks(&phy->dev);
786 }
787
788 return phy;
789
790put_dev:
791 put_device(&phy->dev); /* calls phy_release() which frees resources */
792 return ERR_PTR(ret);
793
794free_phy:
795 kfree(phy);
796 return ERR_PTR(ret);
797}
798EXPORT_SYMBOL_GPL(phy_create);
799
800/**
801 * devm_phy_create() - create a new phy
802 * @dev: device that is creating the new phy
803 * @node: device node of the phy
804 * @ops: function pointers for performing phy operations
805 *
806 * Creates a new PHY device adding it to the PHY class.
807 * While at that, it also associates the device with the phy using devres.
808 * On driver detach, release function is invoked on the devres data,
809 * then, devres data is freed.
810 */
811struct phy *devm_phy_create(struct device *dev, struct device_node *node,
812 const struct phy_ops *ops)
813{
814 struct phy **ptr, *phy;
815
816 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
817 if (!ptr)
818 return ERR_PTR(-ENOMEM);
819
820 phy = phy_create(dev, node, ops);
821 if (!IS_ERR(phy)) {
822 *ptr = phy;
823 devres_add(dev, ptr);
824 } else {
825 devres_free(ptr);
826 }
827
828 return phy;
829}
830EXPORT_SYMBOL_GPL(devm_phy_create);
831
832/**
833 * phy_destroy() - destroy the phy
834 * @phy: the phy to be destroyed
835 *
836 * Called to destroy the phy.
837 */
838void phy_destroy(struct phy *phy)
839{
840 pm_runtime_disable(&phy->dev);
841 device_unregister(&phy->dev);
842}
843EXPORT_SYMBOL_GPL(phy_destroy);
844
845/**
846 * devm_phy_destroy() - destroy the PHY
847 * @dev: device that wants to release this phy
848 * @phy: the phy returned by devm_phy_get()
849 *
850 * destroys the devres associated with this phy and invokes phy_destroy
851 * to destroy the phy.
852 */
853void devm_phy_destroy(struct device *dev, struct phy *phy)
854{
855 int r;
856
857 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
858 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
859}
860EXPORT_SYMBOL_GPL(devm_phy_destroy);
861
862/**
863 * __of_phy_provider_register() - create/register phy provider with the framework
864 * @dev: struct device of the phy provider
865 * @children: device node containing children (if different from dev->of_node)
866 * @owner: the module owner containing of_xlate
867 * @of_xlate: function pointer to obtain phy instance from phy provider
868 *
869 * Creates struct phy_provider from dev and of_xlate function pointer.
870 * This is used in the case of dt boot for finding the phy instance from
871 * phy provider.
872 *
873 * If the PHY provider doesn't nest children directly but uses a separate
874 * child node to contain the individual children, the @children parameter
875 * can be used to override the default. If NULL, the default (dev->of_node)
876 * will be used. If non-NULL, the device node must be a child (or further
877 * descendant) of dev->of_node. Otherwise an ERR_PTR()-encoded -EINVAL
878 * error code is returned.
879 */
880struct phy_provider *__of_phy_provider_register(struct device *dev,
881 struct device_node *children, struct module *owner,
882 struct phy * (*of_xlate)(struct device *dev,
883 struct of_phandle_args *args))
884{
885 struct phy_provider *phy_provider;
886
887 /*
888 * If specified, the device node containing the children must itself
889 * be the provider's device node or a child (or further descendant)
890 * thereof.
891 */
892 if (children) {
893 struct device_node *parent = of_node_get(children), *next;
894
895 while (parent) {
896 if (parent == dev->of_node)
897 break;
898
899 next = of_get_parent(parent);
900 of_node_put(parent);
901 parent = next;
902 }
903
904 if (!parent)
905 return ERR_PTR(-EINVAL);
906
907 of_node_put(parent);
908 } else {
909 children = dev->of_node;
910 }
911
912 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
913 if (!phy_provider)
914 return ERR_PTR(-ENOMEM);
915
916 phy_provider->dev = dev;
917 phy_provider->children = of_node_get(children);
918 phy_provider->owner = owner;
919 phy_provider->of_xlate = of_xlate;
920
921 mutex_lock(&phy_provider_mutex);
922 list_add_tail(&phy_provider->list, &phy_provider_list);
923 mutex_unlock(&phy_provider_mutex);
924
925 return phy_provider;
926}
927EXPORT_SYMBOL_GPL(__of_phy_provider_register);
928
929/**
930 * __devm_of_phy_provider_register() - create/register phy provider with the
931 * framework
932 * @dev: struct device of the phy provider
933 * @owner: the module owner containing of_xlate
934 * @of_xlate: function pointer to obtain phy instance from phy provider
935 *
936 * Creates struct phy_provider from dev and of_xlate function pointer.
937 * This is used in the case of dt boot for finding the phy instance from
938 * phy provider. While at that, it also associates the device with the
939 * phy provider using devres. On driver detach, release function is invoked
940 * on the devres data, then, devres data is freed.
941 */
942struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
943 struct device_node *children, struct module *owner,
944 struct phy * (*of_xlate)(struct device *dev,
945 struct of_phandle_args *args))
946{
947 struct phy_provider **ptr, *phy_provider;
948
949 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
950 if (!ptr)
951 return ERR_PTR(-ENOMEM);
952
953 phy_provider = __of_phy_provider_register(dev, children, owner,
954 of_xlate);
955 if (!IS_ERR(phy_provider)) {
956 *ptr = phy_provider;
957 devres_add(dev, ptr);
958 } else {
959 devres_free(ptr);
960 }
961
962 return phy_provider;
963}
964EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);
965
966/**
967 * of_phy_provider_unregister() - unregister phy provider from the framework
968 * @phy_provider: phy provider returned by of_phy_provider_register()
969 *
970 * Removes the phy_provider created using of_phy_provider_register().
971 */
972void of_phy_provider_unregister(struct phy_provider *phy_provider)
973{
974 if (IS_ERR(phy_provider))
975 return;
976
977 mutex_lock(&phy_provider_mutex);
978 list_del(&phy_provider->list);
979 of_node_put(phy_provider->children);
980 kfree(phy_provider);
981 mutex_unlock(&phy_provider_mutex);
982}
983EXPORT_SYMBOL_GPL(of_phy_provider_unregister);
984
985/**
986 * devm_of_phy_provider_unregister() - remove phy provider from the framework
987 * @dev: struct device of the phy provider
988 *
989 * destroys the devres associated with this phy provider and invokes
990 * of_phy_provider_unregister to unregister the phy provider.
991 */
992void devm_of_phy_provider_unregister(struct device *dev,
993 struct phy_provider *phy_provider) {
994 int r;
995
996 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
997 phy_provider);
998 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
999}
1000EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
1001
1002/**
1003 * phy_release() - release the phy
1004 * @dev: the dev member within phy
1005 *
1006 * When the last reference to the device is removed, it is called
1007 * from the embedded kobject as release method.
1008 */
1009static void phy_release(struct device *dev)
1010{
1011 struct phy *phy;
1012
1013 phy = to_phy(dev);
1014 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
1015 regulator_put(phy->pwr);
1016 ida_simple_remove(&phy_ida, phy->id);
1017 kfree(phy);
1018}
1019
1020static int __init phy_core_init(void)
1021{
1022 phy_class = class_create(THIS_MODULE, "phy");
1023 if (IS_ERR(phy_class)) {
1024 pr_err("failed to create phy class --> %ld\n",
1025 PTR_ERR(phy_class));
1026 return PTR_ERR(phy_class);
1027 }
1028
1029 phy_class->dev_release = phy_release;
1030
1031 return 0;
1032}
1033module_init(phy_core_init);
1034
1035static void __exit phy_core_exit(void)
1036{
1037 class_destroy(phy_class);
1038}
1039module_exit(phy_core_exit);
1040
1041MODULE_DESCRIPTION("Generic PHY Framework");
1042MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
1043MODULE_LICENSE("GPL v2");