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)
228 ret = 0; /* Override possible ret == -ENOTSUPP */
230 mutex_lock(&phy->mutex);
231 if (phy->init_count == 0 && phy->ops->init) {
232 ret = phy->ops->init(phy);
234 dev_err(&phy->dev, "phy init failed --> %d\n", ret);
241 mutex_unlock(&phy->mutex);
242 phy_pm_runtime_put(phy);
245 EXPORT_SYMBOL_GPL(phy_init);
247 int phy_exit(struct phy *phy)
254 ret = phy_pm_runtime_get_sync(phy);
255 if (ret < 0 && ret != -ENOTSUPP)
257 ret = 0; /* Override possible 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)
292 ret = 0; /* Override possible ret == -ENOTSUPP */
294 mutex_lock(&phy->mutex);
295 if (phy->power_count == 0 && phy->ops->power_on) {
296 ret = phy->ops->power_on(phy);
298 dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
303 mutex_unlock(&phy->mutex);
307 mutex_unlock(&phy->mutex);
308 phy_pm_runtime_put_sync(phy);
310 regulator_disable(phy->pwr);
314 EXPORT_SYMBOL_GPL(phy_power_on);
316 int phy_power_off(struct phy *phy)
323 mutex_lock(&phy->mutex);
324 if (phy->power_count == 1 && phy->ops->power_off) {
325 ret = phy->ops->power_off(phy);
327 dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
328 mutex_unlock(&phy->mutex);
333 mutex_unlock(&phy->mutex);
334 phy_pm_runtime_put(phy);
337 regulator_disable(phy->pwr);
341 EXPORT_SYMBOL_GPL(phy_power_off);
344 * _of_phy_get() - lookup and obtain a reference to a phy by phandle
345 * @np: device_node for which to get the phy
346 * @index: the index of the phy
348 * Returns the phy associated with the given phandle value,
349 * after getting a refcount to it or -ENODEV if there is no such phy or
350 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
351 * not yet loaded. This function uses of_xlate call back function provided
352 * while registering the phy_provider to find the phy instance.
354 static struct phy *_of_phy_get(struct device_node *np, int index)
357 struct phy_provider *phy_provider;
358 struct phy *phy = NULL;
359 struct of_phandle_args args;
361 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
364 return ERR_PTR(-ENODEV);
366 mutex_lock(&phy_provider_mutex);
367 phy_provider = of_phy_provider_lookup(args.np);
368 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
369 phy = ERR_PTR(-EPROBE_DEFER);
373 if (!of_device_is_available(args.np)) {
374 dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
375 phy = ERR_PTR(-ENODEV);
379 phy = phy_provider->of_xlate(phy_provider->dev, &args);
382 module_put(phy_provider->owner);
385 mutex_unlock(&phy_provider_mutex);
386 of_node_put(args.np);
392 * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
393 * @np: device_node for which to get the phy
394 * @con_id: name of the phy from device's point of view
396 * Returns the phy driver, after getting a refcount to it; or
397 * -ENODEV if there is no such phy. The caller is responsible for
398 * calling phy_put() to release that count.
400 struct phy *of_phy_get(struct device_node *np, const char *con_id)
402 struct phy *phy = NULL;
406 index = of_property_match_string(np, "phy-names", con_id);
408 phy = _of_phy_get(np, index);
412 if (!try_module_get(phy->ops->owner))
413 return ERR_PTR(-EPROBE_DEFER);
415 get_device(&phy->dev);
419 EXPORT_SYMBOL_GPL(of_phy_get);
422 * phy_put() - release the PHY
423 * @phy: the phy returned by phy_get()
425 * Releases a refcount the caller received from phy_get().
427 void phy_put(struct phy *phy)
429 if (!phy || IS_ERR(phy))
432 module_put(phy->ops->owner);
433 put_device(&phy->dev);
435 EXPORT_SYMBOL_GPL(phy_put);
438 * devm_phy_put() - release the PHY
439 * @dev: device that wants to release this phy
440 * @phy: the phy returned by devm_phy_get()
442 * destroys the devres associated with this phy and invokes phy_put
443 * to release the phy.
445 void devm_phy_put(struct device *dev, struct phy *phy)
452 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
453 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
455 EXPORT_SYMBOL_GPL(devm_phy_put);
458 * of_phy_simple_xlate() - returns the phy instance from phy provider
459 * @dev: the PHY provider device
460 * @args: of_phandle_args (not used here)
462 * Intended to be used by phy provider for the common case where #phy-cells is
463 * 0. For other cases where #phy-cells is greater than '0', the phy provider
464 * should provide a custom of_xlate function that reads the *args* and returns
465 * the appropriate phy.
467 struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
471 struct class_dev_iter iter;
473 class_dev_iter_init(&iter, phy_class, NULL, NULL);
474 while ((dev = class_dev_iter_next(&iter))) {
476 if (args->np != phy->dev.of_node)
479 class_dev_iter_exit(&iter);
483 class_dev_iter_exit(&iter);
484 return ERR_PTR(-ENODEV);
486 EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
489 * phy_get() - lookup and obtain a reference to a phy.
490 * @dev: device that requests this phy
491 * @string: the phy name as given in the dt data or the name of the controller
492 * port for non-dt case
494 * Returns the phy driver, after getting a refcount to it; or
495 * -ENODEV if there is no such phy. The caller is responsible for
496 * calling phy_put() to release that count.
498 struct phy *phy_get(struct device *dev, const char *string)
503 if (dev_WARN(dev, string == NULL, "missing string\n"))
504 return ERR_PTR(-EINVAL);
507 index = of_property_match_string(dev->of_node, "phy-names",
509 phy = _of_phy_get(dev->of_node, index);
511 phy = phy_find(dev, string);
516 if (!try_module_get(phy->ops->owner))
517 return ERR_PTR(-EPROBE_DEFER);
519 get_device(&phy->dev);
523 EXPORT_SYMBOL_GPL(phy_get);
526 * phy_optional_get() - lookup and obtain a reference to an optional phy.
527 * @dev: device that requests this phy
528 * @string: the phy name as given in the dt data or the name of the controller
529 * port for non-dt case
531 * Returns the phy driver, after getting a refcount to it; or
532 * NULL if there is no such phy. The caller is responsible for
533 * calling phy_put() to release that count.
535 struct phy *phy_optional_get(struct device *dev, const char *string)
537 struct phy *phy = phy_get(dev, string);
539 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV))
544 EXPORT_SYMBOL_GPL(phy_optional_get);
547 * devm_phy_get() - lookup and obtain a reference to a phy.
548 * @dev: device that requests this phy
549 * @string: the phy name as given in the dt data or phy device name
552 * Gets the phy using phy_get(), and associates a device with it using
553 * devres. On driver detach, release function is invoked on the devres data,
554 * then, devres data is freed.
556 struct phy *devm_phy_get(struct device *dev, const char *string)
558 struct phy **ptr, *phy;
560 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
562 return ERR_PTR(-ENOMEM);
564 phy = phy_get(dev, string);
567 devres_add(dev, ptr);
574 EXPORT_SYMBOL_GPL(devm_phy_get);
577 * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
578 * @dev: device that requests this phy
579 * @string: the phy name as given in the dt data or phy device name
582 * Gets the phy using phy_get(), and associates a device with it using
583 * devres. On driver detach, release function is invoked on the devres
584 * data, then, devres data is freed. This differs to devm_phy_get() in
585 * that if the phy does not exist, it is not considered an error and
586 * -ENODEV will not be returned. Instead the NULL phy is returned,
587 * which can be passed to all other phy consumer calls.
589 struct phy *devm_phy_optional_get(struct device *dev, const char *string)
591 struct phy *phy = devm_phy_get(dev, string);
593 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV))
598 EXPORT_SYMBOL_GPL(devm_phy_optional_get);
601 * devm_of_phy_get() - lookup and obtain a reference to a phy.
602 * @dev: device that requests this phy
603 * @np: node containing the phy
604 * @con_id: name of the phy from device's point of view
606 * Gets the phy using of_phy_get(), and associates a device with it using
607 * devres. On driver detach, release function is invoked on the devres data,
608 * then, devres data is freed.
610 struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
613 struct phy **ptr, *phy;
615 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
617 return ERR_PTR(-ENOMEM);
619 phy = of_phy_get(np, con_id);
622 devres_add(dev, ptr);
629 EXPORT_SYMBOL_GPL(devm_of_phy_get);
632 * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
633 * @dev: device that requests this phy
634 * @np: node containing the phy
635 * @index: index of the phy
637 * Gets the phy using _of_phy_get(), then gets a refcount to it,
638 * and associates a device with it using devres. On driver detach,
639 * release function is invoked on the devres data,
640 * then, devres data is freed.
643 struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
646 struct phy **ptr, *phy;
648 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
650 return ERR_PTR(-ENOMEM);
652 phy = _of_phy_get(np, index);
658 if (!try_module_get(phy->ops->owner)) {
660 return ERR_PTR(-EPROBE_DEFER);
663 get_device(&phy->dev);
666 devres_add(dev, ptr);
670 EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
673 * phy_create() - create a new phy
674 * @dev: device that is creating the new phy
675 * @node: device node of the phy
676 * @ops: function pointers for performing phy operations
678 * Called to create a phy using phy framework.
680 struct phy *phy_create(struct device *dev, struct device_node *node,
681 const struct phy_ops *ops)
688 return ERR_PTR(-EINVAL);
690 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
692 return ERR_PTR(-ENOMEM);
694 id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
696 dev_err(dev, "unable to get id\n");
701 device_initialize(&phy->dev);
702 mutex_init(&phy->mutex);
704 phy->dev.class = phy_class;
705 phy->dev.parent = dev;
706 phy->dev.of_node = node ?: dev->of_node;
710 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
715 phy->pwr = regulator_get_optional(&phy->dev, "phy");
716 if (IS_ERR(phy->pwr)) {
717 ret = PTR_ERR(phy->pwr);
718 if (ret == -EPROBE_DEFER)
724 ret = device_add(&phy->dev);
728 if (pm_runtime_enabled(dev)) {
729 pm_runtime_enable(&phy->dev);
730 pm_runtime_no_callbacks(&phy->dev);
736 put_device(&phy->dev); /* calls phy_release() which frees resources */
743 EXPORT_SYMBOL_GPL(phy_create);
746 * devm_phy_create() - create a new phy
747 * @dev: device that is creating the new phy
748 * @node: device node of the phy
749 * @ops: function pointers for performing phy operations
751 * Creates a new PHY device adding it to the PHY class.
752 * While at that, it also associates the device with the phy using devres.
753 * On driver detach, release function is invoked on the devres data,
754 * then, devres data is freed.
756 struct phy *devm_phy_create(struct device *dev, struct device_node *node,
757 const struct phy_ops *ops)
759 struct phy **ptr, *phy;
761 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
763 return ERR_PTR(-ENOMEM);
765 phy = phy_create(dev, node, ops);
768 devres_add(dev, ptr);
775 EXPORT_SYMBOL_GPL(devm_phy_create);
778 * phy_destroy() - destroy the phy
779 * @phy: the phy to be destroyed
781 * Called to destroy the phy.
783 void phy_destroy(struct phy *phy)
785 pm_runtime_disable(&phy->dev);
786 device_unregister(&phy->dev);
788 EXPORT_SYMBOL_GPL(phy_destroy);
791 * devm_phy_destroy() - destroy the PHY
792 * @dev: device that wants to release this phy
793 * @phy: the phy returned by devm_phy_get()
795 * destroys the devres associated with this phy and invokes phy_destroy
796 * to destroy the phy.
798 void devm_phy_destroy(struct device *dev, struct phy *phy)
802 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
803 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
805 EXPORT_SYMBOL_GPL(devm_phy_destroy);
808 * __of_phy_provider_register() - create/register phy provider with the framework
809 * @dev: struct device of the phy provider
810 * @owner: the module owner containing of_xlate
811 * @of_xlate: function pointer to obtain phy instance from phy provider
813 * Creates struct phy_provider from dev and of_xlate function pointer.
814 * This is used in the case of dt boot for finding the phy instance from
817 struct phy_provider *__of_phy_provider_register(struct device *dev,
818 struct module *owner, struct phy * (*of_xlate)(struct device *dev,
819 struct of_phandle_args *args))
821 struct phy_provider *phy_provider;
823 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
825 return ERR_PTR(-ENOMEM);
827 phy_provider->dev = dev;
828 phy_provider->owner = owner;
829 phy_provider->of_xlate = of_xlate;
831 mutex_lock(&phy_provider_mutex);
832 list_add_tail(&phy_provider->list, &phy_provider_list);
833 mutex_unlock(&phy_provider_mutex);
837 EXPORT_SYMBOL_GPL(__of_phy_provider_register);
840 * __devm_of_phy_provider_register() - create/register phy provider with the
842 * @dev: struct device of the phy provider
843 * @owner: the module owner containing of_xlate
844 * @of_xlate: function pointer to obtain phy instance from phy provider
846 * Creates struct phy_provider from dev and of_xlate function pointer.
847 * This is used in the case of dt boot for finding the phy instance from
848 * phy provider. While at that, it also associates the device with the
849 * phy provider using devres. On driver detach, release function is invoked
850 * on the devres data, then, devres data is freed.
852 struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
853 struct module *owner, struct phy * (*of_xlate)(struct device *dev,
854 struct of_phandle_args *args))
856 struct phy_provider **ptr, *phy_provider;
858 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
860 return ERR_PTR(-ENOMEM);
862 phy_provider = __of_phy_provider_register(dev, owner, of_xlate);
863 if (!IS_ERR(phy_provider)) {
865 devres_add(dev, ptr);
872 EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);
875 * of_phy_provider_unregister() - unregister phy provider from the framework
876 * @phy_provider: phy provider returned by of_phy_provider_register()
878 * Removes the phy_provider created using of_phy_provider_register().
880 void of_phy_provider_unregister(struct phy_provider *phy_provider)
882 if (IS_ERR(phy_provider))
885 mutex_lock(&phy_provider_mutex);
886 list_del(&phy_provider->list);
888 mutex_unlock(&phy_provider_mutex);
890 EXPORT_SYMBOL_GPL(of_phy_provider_unregister);
893 * devm_of_phy_provider_unregister() - remove phy provider from the framework
894 * @dev: struct device of the phy provider
896 * destroys the devres associated with this phy provider and invokes
897 * of_phy_provider_unregister to unregister the phy provider.
899 void devm_of_phy_provider_unregister(struct device *dev,
900 struct phy_provider *phy_provider) {
903 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
905 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
907 EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
910 * phy_release() - release the phy
911 * @dev: the dev member within phy
913 * When the last reference to the device is removed, it is called
914 * from the embedded kobject as release method.
916 static void phy_release(struct device *dev)
921 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
922 regulator_put(phy->pwr);
923 ida_simple_remove(&phy_ida, phy->id);
927 static int __init phy_core_init(void)
929 phy_class = class_create(THIS_MODULE, "phy");
930 if (IS_ERR(phy_class)) {
931 pr_err("failed to create phy class --> %ld\n",
933 return PTR_ERR(phy_class);
936 phy_class->dev_release = phy_release;
940 module_init(phy_core_init);
942 static void __exit phy_core_exit(void)
944 class_destroy(phy_class);
946 module_exit(phy_core_exit);
948 MODULE_DESCRIPTION("Generic PHY Framework");
949 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
950 MODULE_LICENSE("GPL v2");