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)
293 ret = 0; /* Override possible ret == -ENOTSUPP */
295 mutex_lock(&phy->mutex);
296 if (phy->power_count == 0 && phy->ops->power_on) {
297 ret = phy->ops->power_on(phy);
299 dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
304 mutex_unlock(&phy->mutex);
308 mutex_unlock(&phy->mutex);
309 phy_pm_runtime_put_sync(phy);
312 regulator_disable(phy->pwr);
316 EXPORT_SYMBOL_GPL(phy_power_on);
318 int phy_power_off(struct phy *phy)
325 mutex_lock(&phy->mutex);
326 if (phy->power_count == 1 && phy->ops->power_off) {
327 ret = phy->ops->power_off(phy);
329 dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
330 mutex_unlock(&phy->mutex);
335 mutex_unlock(&phy->mutex);
336 phy_pm_runtime_put(phy);
339 regulator_disable(phy->pwr);
343 EXPORT_SYMBOL_GPL(phy_power_off);
346 * _of_phy_get() - lookup and obtain a reference to a phy by phandle
347 * @np: device_node for which to get the phy
348 * @index: the index of the phy
350 * Returns the phy associated with the given phandle value,
351 * after getting a refcount to it or -ENODEV if there is no such phy or
352 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
353 * not yet loaded. This function uses of_xlate call back function provided
354 * while registering the phy_provider to find the phy instance.
356 static struct phy *_of_phy_get(struct device_node *np, int index)
359 struct phy_provider *phy_provider;
360 struct phy *phy = NULL;
361 struct of_phandle_args args;
363 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
366 return ERR_PTR(-ENODEV);
368 /* This phy type handled by the usb-phy subsystem for now */
369 if (of_device_is_compatible(args.np, "usb-nop-xceiv"))
370 return ERR_PTR(-ENODEV);
372 mutex_lock(&phy_provider_mutex);
373 phy_provider = of_phy_provider_lookup(args.np);
374 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
375 phy = ERR_PTR(-EPROBE_DEFER);
379 if (!of_device_is_available(args.np)) {
380 dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
381 phy = ERR_PTR(-ENODEV);
385 phy = phy_provider->of_xlate(phy_provider->dev, &args);
388 module_put(phy_provider->owner);
391 mutex_unlock(&phy_provider_mutex);
392 of_node_put(args.np);
398 * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
399 * @np: device_node for which to get the phy
400 * @con_id: name of the phy from device's point of view
402 * Returns the phy driver, after getting a refcount to it; or
403 * -ENODEV if there is no such phy. The caller is responsible for
404 * calling phy_put() to release that count.
406 struct phy *of_phy_get(struct device_node *np, const char *con_id)
408 struct phy *phy = NULL;
412 index = of_property_match_string(np, "phy-names", con_id);
414 phy = _of_phy_get(np, index);
418 if (!try_module_get(phy->ops->owner))
419 return ERR_PTR(-EPROBE_DEFER);
421 get_device(&phy->dev);
425 EXPORT_SYMBOL_GPL(of_phy_get);
428 * phy_put() - release the PHY
429 * @phy: the phy returned by phy_get()
431 * Releases a refcount the caller received from phy_get().
433 void phy_put(struct phy *phy)
435 if (!phy || IS_ERR(phy))
438 module_put(phy->ops->owner);
439 put_device(&phy->dev);
441 EXPORT_SYMBOL_GPL(phy_put);
444 * devm_phy_put() - release the PHY
445 * @dev: device that wants to release this phy
446 * @phy: the phy returned by devm_phy_get()
448 * destroys the devres associated with this phy and invokes phy_put
449 * to release the phy.
451 void devm_phy_put(struct device *dev, struct phy *phy)
458 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
459 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
461 EXPORT_SYMBOL_GPL(devm_phy_put);
464 * of_phy_simple_xlate() - returns the phy instance from phy provider
465 * @dev: the PHY provider device
466 * @args: of_phandle_args (not used here)
468 * Intended to be used by phy provider for the common case where #phy-cells is
469 * 0. For other cases where #phy-cells is greater than '0', the phy provider
470 * should provide a custom of_xlate function that reads the *args* and returns
471 * the appropriate phy.
473 struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
477 struct class_dev_iter iter;
479 class_dev_iter_init(&iter, phy_class, NULL, NULL);
480 while ((dev = class_dev_iter_next(&iter))) {
482 if (args->np != phy->dev.of_node)
485 class_dev_iter_exit(&iter);
489 class_dev_iter_exit(&iter);
490 return ERR_PTR(-ENODEV);
492 EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
495 * phy_get() - lookup and obtain a reference to a phy.
496 * @dev: device that requests this phy
497 * @string: the phy name as given in the dt data or the name of the controller
498 * port for non-dt case
500 * Returns the phy driver, after getting a refcount to it; or
501 * -ENODEV if there is no such phy. The caller is responsible for
502 * calling phy_put() to release that count.
504 struct phy *phy_get(struct device *dev, const char *string)
509 if (string == NULL) {
510 dev_WARN(dev, "missing string\n");
511 return ERR_PTR(-EINVAL);
515 index = of_property_match_string(dev->of_node, "phy-names",
517 phy = _of_phy_get(dev->of_node, index);
519 phy = phy_find(dev, string);
524 if (!try_module_get(phy->ops->owner))
525 return ERR_PTR(-EPROBE_DEFER);
527 get_device(&phy->dev);
531 EXPORT_SYMBOL_GPL(phy_get);
534 * phy_optional_get() - lookup and obtain a reference to an optional phy.
535 * @dev: device that requests this phy
536 * @string: the phy name as given in the dt data or the name of the controller
537 * port for non-dt case
539 * Returns the phy driver, after getting a refcount to it; or
540 * NULL if there is no such phy. The caller is responsible for
541 * calling phy_put() to release that count.
543 struct phy *phy_optional_get(struct device *dev, const char *string)
545 struct phy *phy = phy_get(dev, string);
547 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV))
552 EXPORT_SYMBOL_GPL(phy_optional_get);
555 * devm_phy_get() - lookup and obtain a reference to a phy.
556 * @dev: device that requests this phy
557 * @string: the phy name as given in the dt data or phy device name
560 * Gets the phy using phy_get(), and associates a device with it using
561 * devres. On driver detach, release function is invoked on the devres data,
562 * then, devres data is freed.
564 struct phy *devm_phy_get(struct device *dev, const char *string)
566 struct phy **ptr, *phy;
568 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
570 return ERR_PTR(-ENOMEM);
572 phy = phy_get(dev, string);
575 devres_add(dev, ptr);
582 EXPORT_SYMBOL_GPL(devm_phy_get);
585 * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
586 * @dev: device that requests this phy
587 * @string: the phy name as given in the dt data or phy device name
590 * Gets the phy using phy_get(), and associates a device with it using
591 * devres. On driver detach, release function is invoked on the devres
592 * data, then, devres data is freed. This differs to devm_phy_get() in
593 * that if the phy does not exist, it is not considered an error and
594 * -ENODEV will not be returned. Instead the NULL phy is returned,
595 * which can be passed to all other phy consumer calls.
597 struct phy *devm_phy_optional_get(struct device *dev, const char *string)
599 struct phy *phy = devm_phy_get(dev, string);
601 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV))
606 EXPORT_SYMBOL_GPL(devm_phy_optional_get);
609 * devm_of_phy_get() - lookup and obtain a reference to a phy.
610 * @dev: device that requests this phy
611 * @np: node containing the phy
612 * @con_id: name of the phy from device's point of view
614 * Gets the phy using of_phy_get(), and associates a device with it using
615 * devres. On driver detach, release function is invoked on the devres data,
616 * then, devres data is freed.
618 struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
621 struct phy **ptr, *phy;
623 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
625 return ERR_PTR(-ENOMEM);
627 phy = of_phy_get(np, con_id);
630 devres_add(dev, ptr);
637 EXPORT_SYMBOL_GPL(devm_of_phy_get);
640 * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
641 * @dev: device that requests this phy
642 * @np: node containing the phy
643 * @index: index of the phy
645 * Gets the phy using _of_phy_get(), then gets a refcount to it,
646 * and associates a device with it using devres. On driver detach,
647 * release function is invoked on the devres data,
648 * then, devres data is freed.
651 struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
654 struct phy **ptr, *phy;
656 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
658 return ERR_PTR(-ENOMEM);
660 phy = _of_phy_get(np, index);
666 if (!try_module_get(phy->ops->owner)) {
668 return ERR_PTR(-EPROBE_DEFER);
671 get_device(&phy->dev);
674 devres_add(dev, ptr);
678 EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
681 * phy_create() - create a new phy
682 * @dev: device that is creating the new phy
683 * @node: device node of the phy
684 * @ops: function pointers for performing phy operations
686 * Called to create a phy using phy framework.
688 struct phy *phy_create(struct device *dev, struct device_node *node,
689 const struct phy_ops *ops)
696 return ERR_PTR(-EINVAL);
698 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
700 return ERR_PTR(-ENOMEM);
702 id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
704 dev_err(dev, "unable to get id\n");
709 device_initialize(&phy->dev);
710 mutex_init(&phy->mutex);
712 phy->dev.class = phy_class;
713 phy->dev.parent = dev;
714 phy->dev.of_node = node ?: dev->of_node;
718 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
723 phy->pwr = regulator_get_optional(&phy->dev, "phy");
724 if (IS_ERR(phy->pwr)) {
725 ret = PTR_ERR(phy->pwr);
726 if (ret == -EPROBE_DEFER)
732 ret = device_add(&phy->dev);
736 if (pm_runtime_enabled(dev)) {
737 pm_runtime_enable(&phy->dev);
738 pm_runtime_no_callbacks(&phy->dev);
744 put_device(&phy->dev); /* calls phy_release() which frees resources */
751 EXPORT_SYMBOL_GPL(phy_create);
754 * devm_phy_create() - create a new phy
755 * @dev: device that is creating the new phy
756 * @node: device node of the phy
757 * @ops: function pointers for performing phy operations
759 * Creates a new PHY device adding it to the PHY class.
760 * While at that, it also associates the device with the phy using devres.
761 * On driver detach, release function is invoked on the devres data,
762 * then, devres data is freed.
764 struct phy *devm_phy_create(struct device *dev, struct device_node *node,
765 const struct phy_ops *ops)
767 struct phy **ptr, *phy;
769 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
771 return ERR_PTR(-ENOMEM);
773 phy = phy_create(dev, node, ops);
776 devres_add(dev, ptr);
783 EXPORT_SYMBOL_GPL(devm_phy_create);
786 * phy_destroy() - destroy the phy
787 * @phy: the phy to be destroyed
789 * Called to destroy the phy.
791 void phy_destroy(struct phy *phy)
793 pm_runtime_disable(&phy->dev);
794 device_unregister(&phy->dev);
796 EXPORT_SYMBOL_GPL(phy_destroy);
799 * devm_phy_destroy() - destroy the PHY
800 * @dev: device that wants to release this phy
801 * @phy: the phy returned by devm_phy_get()
803 * destroys the devres associated with this phy and invokes phy_destroy
804 * to destroy the phy.
806 void devm_phy_destroy(struct device *dev, struct phy *phy)
810 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
811 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
813 EXPORT_SYMBOL_GPL(devm_phy_destroy);
816 * __of_phy_provider_register() - create/register phy provider with the framework
817 * @dev: struct device of the phy provider
818 * @owner: the module owner containing of_xlate
819 * @of_xlate: function pointer to obtain phy instance from phy provider
821 * Creates struct phy_provider from dev and of_xlate function pointer.
822 * This is used in the case of dt boot for finding the phy instance from
825 struct phy_provider *__of_phy_provider_register(struct device *dev,
826 struct module *owner, struct phy * (*of_xlate)(struct device *dev,
827 struct of_phandle_args *args))
829 struct phy_provider *phy_provider;
831 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
833 return ERR_PTR(-ENOMEM);
835 phy_provider->dev = dev;
836 phy_provider->owner = owner;
837 phy_provider->of_xlate = of_xlate;
839 mutex_lock(&phy_provider_mutex);
840 list_add_tail(&phy_provider->list, &phy_provider_list);
841 mutex_unlock(&phy_provider_mutex);
845 EXPORT_SYMBOL_GPL(__of_phy_provider_register);
848 * __devm_of_phy_provider_register() - create/register phy provider with the
850 * @dev: struct device of the phy provider
851 * @owner: the module owner containing of_xlate
852 * @of_xlate: function pointer to obtain phy instance from phy provider
854 * Creates struct phy_provider from dev and of_xlate function pointer.
855 * This is used in the case of dt boot for finding the phy instance from
856 * phy provider. While at that, it also associates the device with the
857 * phy provider using devres. On driver detach, release function is invoked
858 * on the devres data, then, devres data is freed.
860 struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
861 struct module *owner, struct phy * (*of_xlate)(struct device *dev,
862 struct of_phandle_args *args))
864 struct phy_provider **ptr, *phy_provider;
866 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
868 return ERR_PTR(-ENOMEM);
870 phy_provider = __of_phy_provider_register(dev, owner, of_xlate);
871 if (!IS_ERR(phy_provider)) {
873 devres_add(dev, ptr);
880 EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);
883 * of_phy_provider_unregister() - unregister phy provider from the framework
884 * @phy_provider: phy provider returned by of_phy_provider_register()
886 * Removes the phy_provider created using of_phy_provider_register().
888 void of_phy_provider_unregister(struct phy_provider *phy_provider)
890 if (IS_ERR(phy_provider))
893 mutex_lock(&phy_provider_mutex);
894 list_del(&phy_provider->list);
896 mutex_unlock(&phy_provider_mutex);
898 EXPORT_SYMBOL_GPL(of_phy_provider_unregister);
901 * devm_of_phy_provider_unregister() - remove phy provider from the framework
902 * @dev: struct device of the phy provider
904 * destroys the devres associated with this phy provider and invokes
905 * of_phy_provider_unregister to unregister the phy provider.
907 void devm_of_phy_provider_unregister(struct device *dev,
908 struct phy_provider *phy_provider) {
911 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
913 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
915 EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
918 * phy_release() - release the phy
919 * @dev: the dev member within phy
921 * When the last reference to the device is removed, it is called
922 * from the embedded kobject as release method.
924 static void phy_release(struct device *dev)
929 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
930 regulator_put(phy->pwr);
931 ida_simple_remove(&phy_ida, phy->id);
935 static int __init phy_core_init(void)
937 phy_class = class_create(THIS_MODULE, "phy");
938 if (IS_ERR(phy_class)) {
939 pr_err("failed to create phy class --> %ld\n",
941 return PTR_ERR(phy_class);
944 phy_class->dev_release = phy_release;
948 module_init(phy_core_init);
950 static void __exit phy_core_exit(void)
952 class_destroy(phy_class);
954 module_exit(phy_core_exit);
956 MODULE_DESCRIPTION("Generic PHY Framework");
957 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
958 MODULE_LICENSE("GPL v2");