2 * phy-core.c -- Generic Phy framework.
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
6 * Author: Kishon Vijay Abraham I <kishon@ti.com>
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.
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>
21 #include <linux/phy/phy.h>
22 #include <linux/idr.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/regulator/consumer.h>
26 static struct class *phy_class;
27 static DEFINE_MUTEX(phy_provider_mutex);
28 static LIST_HEAD(phy_provider_list);
29 static LIST_HEAD(phys);
30 static DEFINE_IDA(phy_ida);
32 static void devm_phy_release(struct device *dev, void *res)
34 struct phy *phy = *(struct phy **)res;
39 static void devm_phy_provider_release(struct device *dev, void *res)
41 struct phy_provider *phy_provider = *(struct phy_provider **)res;
43 of_phy_provider_unregister(phy_provider);
46 static void devm_phy_consume(struct device *dev, void *res)
48 struct phy *phy = *(struct phy **)res;
53 static int devm_phy_match(struct device *dev, void *res, void *match_data)
55 struct phy **phy = res;
57 return *phy == match_data;
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
66 * Creates and registers phy_lookup entry.
68 int phy_create_lookup(struct phy *phy, const char *con_id, const char *dev_id)
70 struct phy_lookup *pl;
72 if (!phy || !dev_id || !con_id)
75 pl = kzalloc(sizeof(*pl), GFP_KERNEL);
83 mutex_lock(&phy_provider_mutex);
84 list_add_tail(&pl->node, &phys);
85 mutex_unlock(&phy_provider_mutex);
89 EXPORT_SYMBOL_GPL(phy_create_lookup);
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
97 * Finds and unregisters phy_lookup entry that was created with
98 * phy_create_lookup().
100 void phy_remove_lookup(struct phy *phy, const char *con_id, const char *dev_id)
102 struct phy_lookup *pl;
104 if (!phy || !dev_id || !con_id)
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)) {
115 mutex_unlock(&phy_provider_mutex);
117 EXPORT_SYMBOL_GPL(phy_remove_lookup);
119 static struct phy *phy_find(struct device *dev, const char *con_id)
121 const char *dev_id = dev_name(dev);
122 struct phy_lookup *p, *pl = NULL;
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)) {
130 mutex_unlock(&phy_provider_mutex);
132 return pl ? pl->phy : ERR_PTR(-ENODEV);
135 static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
137 struct phy_provider *phy_provider;
138 struct device_node *child;
140 list_for_each_entry(phy_provider, &phy_provider_list, list) {
141 if (phy_provider->dev->of_node == node)
144 for_each_child_of_node(phy_provider->dev->of_node, child)
149 return ERR_PTR(-EPROBE_DEFER);
152 int phy_pm_runtime_get(struct phy *phy)
156 if (!pm_runtime_enabled(&phy->dev))
159 ret = pm_runtime_get(&phy->dev);
160 if (ret < 0 && ret != -EINPROGRESS)
161 pm_runtime_put_noidle(&phy->dev);
165 EXPORT_SYMBOL_GPL(phy_pm_runtime_get);
167 int phy_pm_runtime_get_sync(struct phy *phy)
171 if (!pm_runtime_enabled(&phy->dev))
174 ret = pm_runtime_get_sync(&phy->dev);
176 pm_runtime_put_sync(&phy->dev);
180 EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync);
182 int phy_pm_runtime_put(struct phy *phy)
184 if (!pm_runtime_enabled(&phy->dev))
187 return pm_runtime_put(&phy->dev);
189 EXPORT_SYMBOL_GPL(phy_pm_runtime_put);
191 int phy_pm_runtime_put_sync(struct phy *phy)
193 if (!pm_runtime_enabled(&phy->dev))
196 return pm_runtime_put_sync(&phy->dev);
198 EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync);
200 void phy_pm_runtime_allow(struct phy *phy)
202 if (!pm_runtime_enabled(&phy->dev))
205 pm_runtime_allow(&phy->dev);
207 EXPORT_SYMBOL_GPL(phy_pm_runtime_allow);
209 void phy_pm_runtime_forbid(struct phy *phy)
211 if (!pm_runtime_enabled(&phy->dev))
214 pm_runtime_forbid(&phy->dev);
216 EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid);
218 int phy_init(struct phy *phy)
225 ret = phy_pm_runtime_get_sync(phy);
226 if (ret < 0 && ret != -ENOTSUPP)
229 mutex_lock(&phy->mutex);
230 if (phy->init_count == 0 && phy->ops->init) {
231 ret = phy->ops->init(phy);
233 dev_err(&phy->dev, "phy init failed --> %d\n", ret);
237 ret = 0; /* Override possible ret == -ENOTSUPP */
242 mutex_unlock(&phy->mutex);
243 phy_pm_runtime_put(phy);
246 EXPORT_SYMBOL_GPL(phy_init);
248 int phy_exit(struct phy *phy)
255 ret = phy_pm_runtime_get_sync(phy);
256 if (ret < 0 && ret != -ENOTSUPP)
259 mutex_lock(&phy->mutex);
260 if (phy->init_count == 1 && phy->ops->exit) {
261 ret = phy->ops->exit(phy);
263 dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
270 mutex_unlock(&phy->mutex);
271 phy_pm_runtime_put(phy);
274 EXPORT_SYMBOL_GPL(phy_exit);
276 int phy_power_on(struct phy *phy)
284 ret = regulator_enable(phy->pwr);
289 ret = phy_pm_runtime_get_sync(phy);
290 if (ret < 0 && ret != -ENOTSUPP)
293 mutex_lock(&phy->mutex);
294 if (phy->power_count == 0 && phy->ops->power_on) {
295 ret = phy->ops->power_on(phy);
297 dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
301 ret = 0; /* Override possible ret == -ENOTSUPP */
304 mutex_unlock(&phy->mutex);
308 mutex_unlock(&phy->mutex);
309 phy_pm_runtime_put_sync(phy);
311 regulator_disable(phy->pwr);
315 EXPORT_SYMBOL_GPL(phy_power_on);
317 int phy_power_off(struct phy *phy)
324 mutex_lock(&phy->mutex);
325 if (phy->power_count == 1 && phy->ops->power_off) {
326 ret = phy->ops->power_off(phy);
328 dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
329 mutex_unlock(&phy->mutex);
334 mutex_unlock(&phy->mutex);
335 phy_pm_runtime_put(phy);
338 regulator_disable(phy->pwr);
342 EXPORT_SYMBOL_GPL(phy_power_off);
345 * _of_phy_get() - lookup and obtain a reference to a phy by phandle
346 * @np: device_node for which to get the phy
347 * @index: the index of the phy
349 * Returns the phy associated with the given phandle value,
350 * after getting a refcount to it or -ENODEV if there is no such phy or
351 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
352 * not yet loaded. This function uses of_xlate call back function provided
353 * while registering the phy_provider to find the phy instance.
355 static struct phy *_of_phy_get(struct device_node *np, int index)
358 struct phy_provider *phy_provider;
359 struct phy *phy = NULL;
360 struct of_phandle_args args;
362 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
365 return ERR_PTR(-ENODEV);
367 mutex_lock(&phy_provider_mutex);
368 phy_provider = of_phy_provider_lookup(args.np);
369 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
370 phy = ERR_PTR(-EPROBE_DEFER);
374 phy = phy_provider->of_xlate(phy_provider->dev, &args);
375 module_put(phy_provider->owner);
378 mutex_unlock(&phy_provider_mutex);
379 of_node_put(args.np);
385 * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
386 * @np: device_node for which to get the phy
387 * @con_id: name of the phy from device's point of view
389 * Returns the phy driver, after getting a refcount to it; or
390 * -ENODEV if there is no such phy. The caller is responsible for
391 * calling phy_put() to release that count.
393 struct phy *of_phy_get(struct device_node *np, const char *con_id)
395 struct phy *phy = NULL;
399 index = of_property_match_string(np, "phy-names", con_id);
401 phy = _of_phy_get(np, index);
405 if (!try_module_get(phy->ops->owner))
406 return ERR_PTR(-EPROBE_DEFER);
408 get_device(&phy->dev);
412 EXPORT_SYMBOL_GPL(of_phy_get);
415 * phy_put() - release the PHY
416 * @phy: the phy returned by phy_get()
418 * Releases a refcount the caller received from phy_get().
420 void phy_put(struct phy *phy)
422 if (!phy || IS_ERR(phy))
425 module_put(phy->ops->owner);
426 put_device(&phy->dev);
428 EXPORT_SYMBOL_GPL(phy_put);
431 * devm_phy_put() - release the PHY
432 * @dev: device that wants to release this phy
433 * @phy: the phy returned by devm_phy_get()
435 * destroys the devres associated with this phy and invokes phy_put
436 * to release the phy.
438 void devm_phy_put(struct device *dev, struct phy *phy)
445 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
446 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
448 EXPORT_SYMBOL_GPL(devm_phy_put);
451 * of_phy_simple_xlate() - returns the phy instance from phy provider
452 * @dev: the PHY provider device
453 * @args: of_phandle_args (not used here)
455 * Intended to be used by phy provider for the common case where #phy-cells is
456 * 0. For other cases where #phy-cells is greater than '0', the phy provider
457 * should provide a custom of_xlate function that reads the *args* and returns
458 * the appropriate phy.
460 struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
464 struct class_dev_iter iter;
466 class_dev_iter_init(&iter, phy_class, NULL, NULL);
467 while ((dev = class_dev_iter_next(&iter))) {
469 if (args->np != phy->dev.of_node)
472 class_dev_iter_exit(&iter);
476 class_dev_iter_exit(&iter);
477 return ERR_PTR(-ENODEV);
479 EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
482 * phy_get() - lookup and obtain a reference to a phy.
483 * @dev: device that requests this phy
484 * @string: the phy name as given in the dt data or the name of the controller
485 * port for non-dt case
487 * Returns the phy driver, after getting a refcount to it; or
488 * -ENODEV if there is no such phy. The caller is responsible for
489 * calling phy_put() to release that count.
491 struct phy *phy_get(struct device *dev, const char *string)
496 if (string == NULL) {
497 dev_WARN(dev, "missing string\n");
498 return ERR_PTR(-EINVAL);
502 index = of_property_match_string(dev->of_node, "phy-names",
504 phy = _of_phy_get(dev->of_node, index);
506 phy = phy_find(dev, string);
511 if (!try_module_get(phy->ops->owner))
512 return ERR_PTR(-EPROBE_DEFER);
514 get_device(&phy->dev);
518 EXPORT_SYMBOL_GPL(phy_get);
521 * phy_optional_get() - lookup and obtain a reference to an optional phy.
522 * @dev: device that requests this phy
523 * @string: the phy name as given in the dt data or the name of the controller
524 * port for non-dt case
526 * Returns the phy driver, after getting a refcount to it; or
527 * NULL if there is no such phy. The caller is responsible for
528 * calling phy_put() to release that count.
530 struct phy *phy_optional_get(struct device *dev, const char *string)
532 struct phy *phy = phy_get(dev, string);
534 if (PTR_ERR(phy) == -ENODEV)
539 EXPORT_SYMBOL_GPL(phy_optional_get);
542 * devm_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 phy device name
547 * Gets the phy using phy_get(), and associates a device with it using
548 * devres. On driver detach, release function is invoked on the devres data,
549 * then, devres data is freed.
551 struct phy *devm_phy_get(struct device *dev, const char *string)
553 struct phy **ptr, *phy;
555 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
557 return ERR_PTR(-ENOMEM);
559 phy = phy_get(dev, string);
562 devres_add(dev, ptr);
569 EXPORT_SYMBOL_GPL(devm_phy_get);
572 * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
573 * @dev: device that requests this phy
574 * @string: the phy name as given in the dt data or phy device name
577 * Gets the phy using phy_get(), and associates a device with it using
578 * devres. On driver detach, release function is invoked on the devres
579 * data, then, devres data is freed. This differs to devm_phy_get() in
580 * that if the phy does not exist, it is not considered an error and
581 * -ENODEV will not be returned. Instead the NULL phy is returned,
582 * which can be passed to all other phy consumer calls.
584 struct phy *devm_phy_optional_get(struct device *dev, const char *string)
586 struct phy *phy = devm_phy_get(dev, string);
588 if (PTR_ERR(phy) == -ENODEV)
593 EXPORT_SYMBOL_GPL(devm_phy_optional_get);
596 * devm_of_phy_get() - lookup and obtain a reference to a phy.
597 * @dev: device that requests this phy
598 * @np: node containing the phy
599 * @con_id: name of the phy from device's point of view
601 * Gets the phy using of_phy_get(), and associates a device with it using
602 * devres. On driver detach, release function is invoked on the devres data,
603 * then, devres data is freed.
605 struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
608 struct phy **ptr, *phy;
610 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
612 return ERR_PTR(-ENOMEM);
614 phy = of_phy_get(np, con_id);
617 devres_add(dev, ptr);
624 EXPORT_SYMBOL_GPL(devm_of_phy_get);
627 * phy_create() - create a new phy
628 * @dev: device that is creating the new phy
629 * @node: device node of the phy
630 * @ops: function pointers for performing phy operations
632 * Called to create a phy using phy framework.
634 struct phy *phy_create(struct device *dev, struct device_node *node,
635 const struct phy_ops *ops)
642 return ERR_PTR(-EINVAL);
644 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
646 return ERR_PTR(-ENOMEM);
648 id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
650 dev_err(dev, "unable to get id\n");
656 phy->pwr = regulator_get_optional(dev, "phy");
657 if (IS_ERR(phy->pwr)) {
658 if (PTR_ERR(phy->pwr) == -EPROBE_DEFER) {
665 device_initialize(&phy->dev);
666 mutex_init(&phy->mutex);
668 phy->dev.class = phy_class;
669 phy->dev.parent = dev;
670 phy->dev.of_node = node ?: dev->of_node;
674 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
678 ret = device_add(&phy->dev);
682 if (pm_runtime_enabled(dev)) {
683 pm_runtime_enable(&phy->dev);
684 pm_runtime_no_callbacks(&phy->dev);
690 put_device(&phy->dev); /* calls phy_release() which frees resources */
694 ida_simple_remove(&phy_ida, phy->id);
700 EXPORT_SYMBOL_GPL(phy_create);
703 * devm_phy_create() - create a new phy
704 * @dev: device that is creating the new phy
705 * @node: device node of the phy
706 * @ops: function pointers for performing phy operations
708 * Creates a new PHY device adding it to the PHY class.
709 * While at that, it also associates the device with the phy using devres.
710 * On driver detach, release function is invoked on the devres data,
711 * then, devres data is freed.
713 struct phy *devm_phy_create(struct device *dev, struct device_node *node,
714 const struct phy_ops *ops)
716 struct phy **ptr, *phy;
718 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
720 return ERR_PTR(-ENOMEM);
722 phy = phy_create(dev, node, ops);
725 devres_add(dev, ptr);
732 EXPORT_SYMBOL_GPL(devm_phy_create);
735 * phy_destroy() - destroy the phy
736 * @phy: the phy to be destroyed
738 * Called to destroy the phy.
740 void phy_destroy(struct phy *phy)
742 pm_runtime_disable(&phy->dev);
743 device_unregister(&phy->dev);
745 EXPORT_SYMBOL_GPL(phy_destroy);
748 * devm_phy_destroy() - destroy the PHY
749 * @dev: device that wants to release this phy
750 * @phy: the phy returned by devm_phy_get()
752 * destroys the devres associated with this phy and invokes phy_destroy
753 * to destroy the phy.
755 void devm_phy_destroy(struct device *dev, struct phy *phy)
759 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
760 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
762 EXPORT_SYMBOL_GPL(devm_phy_destroy);
765 * __of_phy_provider_register() - create/register phy provider with the framework
766 * @dev: struct device of the phy provider
767 * @owner: the module owner containing of_xlate
768 * @of_xlate: function pointer to obtain phy instance from phy provider
770 * Creates struct phy_provider from dev and of_xlate function pointer.
771 * This is used in the case of dt boot for finding the phy instance from
774 struct phy_provider *__of_phy_provider_register(struct device *dev,
775 struct module *owner, struct phy * (*of_xlate)(struct device *dev,
776 struct of_phandle_args *args))
778 struct phy_provider *phy_provider;
780 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
782 return ERR_PTR(-ENOMEM);
784 phy_provider->dev = dev;
785 phy_provider->owner = owner;
786 phy_provider->of_xlate = of_xlate;
788 mutex_lock(&phy_provider_mutex);
789 list_add_tail(&phy_provider->list, &phy_provider_list);
790 mutex_unlock(&phy_provider_mutex);
794 EXPORT_SYMBOL_GPL(__of_phy_provider_register);
797 * __devm_of_phy_provider_register() - create/register phy provider with the
799 * @dev: struct device of the phy provider
800 * @owner: the module owner containing of_xlate
801 * @of_xlate: function pointer to obtain phy instance from phy provider
803 * Creates struct phy_provider from dev and of_xlate function pointer.
804 * This is used in the case of dt boot for finding the phy instance from
805 * phy provider. While at that, it also associates the device with the
806 * phy provider using devres. On driver detach, release function is invoked
807 * on the devres data, then, devres data is freed.
809 struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
810 struct module *owner, struct phy * (*of_xlate)(struct device *dev,
811 struct of_phandle_args *args))
813 struct phy_provider **ptr, *phy_provider;
815 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
817 return ERR_PTR(-ENOMEM);
819 phy_provider = __of_phy_provider_register(dev, owner, of_xlate);
820 if (!IS_ERR(phy_provider)) {
822 devres_add(dev, ptr);
829 EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);
832 * of_phy_provider_unregister() - unregister phy provider from the framework
833 * @phy_provider: phy provider returned by of_phy_provider_register()
835 * Removes the phy_provider created using of_phy_provider_register().
837 void of_phy_provider_unregister(struct phy_provider *phy_provider)
839 if (IS_ERR(phy_provider))
842 mutex_lock(&phy_provider_mutex);
843 list_del(&phy_provider->list);
845 mutex_unlock(&phy_provider_mutex);
847 EXPORT_SYMBOL_GPL(of_phy_provider_unregister);
850 * devm_of_phy_provider_unregister() - remove phy provider from the framework
851 * @dev: struct device of the phy provider
853 * destroys the devres associated with this phy provider and invokes
854 * of_phy_provider_unregister to unregister the phy provider.
856 void devm_of_phy_provider_unregister(struct device *dev,
857 struct phy_provider *phy_provider) {
860 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
862 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
864 EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
867 * phy_release() - release the phy
868 * @dev: the dev member within phy
870 * When the last reference to the device is removed, it is called
871 * from the embedded kobject as release method.
873 static void phy_release(struct device *dev)
878 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
879 regulator_put(phy->pwr);
880 ida_simple_remove(&phy_ida, phy->id);
884 static int __init phy_core_init(void)
886 phy_class = class_create(THIS_MODULE, "phy");
887 if (IS_ERR(phy_class)) {
888 pr_err("failed to create phy class --> %ld\n",
890 return PTR_ERR(phy_class);
893 phy_class->dev_release = phy_release;
897 module_init(phy_core_init);
899 static void __exit phy_core_exit(void)
901 class_destroy(phy_class);
903 module_exit(phy_core_exit);
905 MODULE_DESCRIPTION("Generic PHY Framework");
906 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
907 MODULE_LICENSE("GPL v2");