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->children, child)
149 return ERR_PTR(-EPROBE_DEFER);
152 int phy_pm_runtime_get(struct phy *phy)
159 if (!pm_runtime_enabled(&phy->dev))
162 ret = pm_runtime_get(&phy->dev);
163 if (ret < 0 && ret != -EINPROGRESS)
164 pm_runtime_put_noidle(&phy->dev);
168 EXPORT_SYMBOL_GPL(phy_pm_runtime_get);
170 int phy_pm_runtime_get_sync(struct phy *phy)
177 if (!pm_runtime_enabled(&phy->dev))
180 ret = pm_runtime_get_sync(&phy->dev);
182 pm_runtime_put_sync(&phy->dev);
186 EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync);
188 int phy_pm_runtime_put(struct phy *phy)
193 if (!pm_runtime_enabled(&phy->dev))
196 return pm_runtime_put(&phy->dev);
198 EXPORT_SYMBOL_GPL(phy_pm_runtime_put);
200 int phy_pm_runtime_put_sync(struct phy *phy)
205 if (!pm_runtime_enabled(&phy->dev))
208 return pm_runtime_put_sync(&phy->dev);
210 EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync);
212 void phy_pm_runtime_allow(struct phy *phy)
217 if (!pm_runtime_enabled(&phy->dev))
220 pm_runtime_allow(&phy->dev);
222 EXPORT_SYMBOL_GPL(phy_pm_runtime_allow);
224 void phy_pm_runtime_forbid(struct phy *phy)
229 if (!pm_runtime_enabled(&phy->dev))
232 pm_runtime_forbid(&phy->dev);
234 EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid);
236 int phy_init(struct phy *phy)
243 ret = phy_pm_runtime_get_sync(phy);
244 if (ret < 0 && ret != -ENOTSUPP)
246 ret = 0; /* Override possible ret == -ENOTSUPP */
248 mutex_lock(&phy->mutex);
249 if (phy->init_count == 0 && phy->ops->init) {
250 ret = phy->ops->init(phy);
252 dev_err(&phy->dev, "phy init failed --> %d\n", ret);
259 mutex_unlock(&phy->mutex);
260 phy_pm_runtime_put(phy);
263 EXPORT_SYMBOL_GPL(phy_init);
265 int phy_exit(struct phy *phy)
272 ret = phy_pm_runtime_get_sync(phy);
273 if (ret < 0 && ret != -ENOTSUPP)
275 ret = 0; /* Override possible ret == -ENOTSUPP */
277 mutex_lock(&phy->mutex);
278 if (phy->init_count == 1 && phy->ops->exit) {
279 ret = phy->ops->exit(phy);
281 dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
288 mutex_unlock(&phy->mutex);
289 phy_pm_runtime_put(phy);
292 EXPORT_SYMBOL_GPL(phy_exit);
294 int phy_power_on(struct phy *phy)
302 ret = regulator_enable(phy->pwr);
307 ret = phy_pm_runtime_get_sync(phy);
308 if (ret < 0 && ret != -ENOTSUPP)
311 ret = 0; /* Override possible ret == -ENOTSUPP */
313 mutex_lock(&phy->mutex);
314 if (phy->power_count == 0 && phy->ops->power_on) {
315 ret = phy->ops->power_on(phy);
317 dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
322 mutex_unlock(&phy->mutex);
326 mutex_unlock(&phy->mutex);
327 phy_pm_runtime_put_sync(phy);
330 regulator_disable(phy->pwr);
334 EXPORT_SYMBOL_GPL(phy_power_on);
336 int phy_power_off(struct phy *phy)
343 mutex_lock(&phy->mutex);
344 if (phy->power_count == 1 && phy->ops->power_off) {
345 ret = phy->ops->power_off(phy);
347 dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
348 mutex_unlock(&phy->mutex);
353 mutex_unlock(&phy->mutex);
354 phy_pm_runtime_put(phy);
357 regulator_disable(phy->pwr);
361 EXPORT_SYMBOL_GPL(phy_power_off);
363 int phy_set_mode_ext(struct phy *phy, enum phy_mode mode, int submode)
367 if (!phy || !phy->ops->set_mode)
370 mutex_lock(&phy->mutex);
371 ret = phy->ops->set_mode(phy, mode, submode);
373 phy->attrs.mode = mode;
374 mutex_unlock(&phy->mutex);
378 EXPORT_SYMBOL_GPL(phy_set_mode_ext);
380 int phy_reset(struct phy *phy)
384 if (!phy || !phy->ops->reset)
387 mutex_lock(&phy->mutex);
388 ret = phy->ops->reset(phy);
389 mutex_unlock(&phy->mutex);
393 EXPORT_SYMBOL_GPL(phy_reset);
395 int phy_calibrate(struct phy *phy)
399 if (!phy || !phy->ops->calibrate)
402 mutex_lock(&phy->mutex);
403 ret = phy->ops->calibrate(phy);
404 mutex_unlock(&phy->mutex);
408 EXPORT_SYMBOL_GPL(phy_calibrate);
411 * phy_configure() - Changes the phy parameters
412 * @phy: the phy returned by phy_get()
413 * @opts: New configuration to apply
415 * Used to change the PHY parameters. phy_init() must have been called
416 * on the phy. The configuration will be applied on the current phy
417 * mode, that can be changed using phy_set_mode().
419 * Returns: 0 if successful, an negative error code otherwise
421 int phy_configure(struct phy *phy, union phy_configure_opts *opts)
428 if (!phy->ops->configure)
431 mutex_lock(&phy->mutex);
432 ret = phy->ops->configure(phy, opts);
433 mutex_unlock(&phy->mutex);
437 EXPORT_SYMBOL_GPL(phy_configure);
440 * phy_validate() - Checks the phy parameters
441 * @phy: the phy returned by phy_get()
442 * @mode: phy_mode the configuration is applicable to.
443 * @submode: PHY submode the configuration is applicable to.
444 * @opts: Configuration to check
446 * Used to check that the current set of parameters can be handled by
447 * the phy. Implementations are free to tune the parameters passed as
448 * arguments if needed by some implementation detail or
449 * constraints. It will not change any actual configuration of the
450 * PHY, so calling it as many times as deemed fit will have no side
453 * Returns: 0 if successful, an negative error code otherwise
455 int phy_validate(struct phy *phy, enum phy_mode mode, int submode,
456 union phy_configure_opts *opts)
463 if (!phy->ops->validate)
466 mutex_lock(&phy->mutex);
467 ret = phy->ops->validate(phy, mode, submode, opts);
468 mutex_unlock(&phy->mutex);
472 EXPORT_SYMBOL_GPL(phy_validate);
475 * _of_phy_get() - lookup and obtain a reference to a phy by phandle
476 * @np: device_node for which to get the phy
477 * @index: the index of the phy
479 * Returns the phy associated with the given phandle value,
480 * after getting a refcount to it or -ENODEV if there is no such phy or
481 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
482 * not yet loaded. This function uses of_xlate call back function provided
483 * while registering the phy_provider to find the phy instance.
485 static struct phy *_of_phy_get(struct device_node *np, int index)
488 struct phy_provider *phy_provider;
489 struct phy *phy = NULL;
490 struct of_phandle_args args;
492 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
495 return ERR_PTR(-ENODEV);
497 /* This phy type handled by the usb-phy subsystem for now */
498 if (of_device_is_compatible(args.np, "usb-nop-xceiv"))
499 return ERR_PTR(-ENODEV);
501 mutex_lock(&phy_provider_mutex);
502 phy_provider = of_phy_provider_lookup(args.np);
503 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
504 phy = ERR_PTR(-EPROBE_DEFER);
508 if (!of_device_is_available(args.np)) {
509 dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
510 phy = ERR_PTR(-ENODEV);
514 phy = phy_provider->of_xlate(phy_provider->dev, &args);
517 module_put(phy_provider->owner);
520 mutex_unlock(&phy_provider_mutex);
521 of_node_put(args.np);
527 * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
528 * @np: device_node for which to get the phy
529 * @con_id: name of the phy from device's point of view
531 * Returns the phy driver, after getting a refcount to it; or
532 * -ENODEV if there is no such phy. The caller is responsible for
533 * calling phy_put() to release that count.
535 struct phy *of_phy_get(struct device_node *np, const char *con_id)
537 struct phy *phy = NULL;
541 index = of_property_match_string(np, "phy-names", con_id);
543 phy = _of_phy_get(np, index);
547 if (!try_module_get(phy->ops->owner))
548 return ERR_PTR(-EPROBE_DEFER);
550 get_device(&phy->dev);
554 EXPORT_SYMBOL_GPL(of_phy_get);
557 * phy_put() - release the PHY
558 * @phy: the phy returned by phy_get()
560 * Releases a refcount the caller received from phy_get().
562 void phy_put(struct phy *phy)
564 if (!phy || IS_ERR(phy))
567 module_put(phy->ops->owner);
568 put_device(&phy->dev);
570 EXPORT_SYMBOL_GPL(phy_put);
573 * devm_phy_put() - release the PHY
574 * @dev: device that wants to release this phy
575 * @phy: the phy returned by devm_phy_get()
577 * destroys the devres associated with this phy and invokes phy_put
578 * to release the phy.
580 void devm_phy_put(struct device *dev, struct phy *phy)
587 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
588 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
590 EXPORT_SYMBOL_GPL(devm_phy_put);
593 * of_phy_simple_xlate() - returns the phy instance from phy provider
594 * @dev: the PHY provider device
595 * @args: of_phandle_args (not used here)
597 * Intended to be used by phy provider for the common case where #phy-cells is
598 * 0. For other cases where #phy-cells is greater than '0', the phy provider
599 * should provide a custom of_xlate function that reads the *args* and returns
600 * the appropriate phy.
602 struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
606 struct class_dev_iter iter;
608 class_dev_iter_init(&iter, phy_class, NULL, NULL);
609 while ((dev = class_dev_iter_next(&iter))) {
611 if (args->np != phy->dev.of_node)
614 class_dev_iter_exit(&iter);
618 class_dev_iter_exit(&iter);
619 return ERR_PTR(-ENODEV);
621 EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
624 * phy_get() - lookup and obtain a reference to a phy.
625 * @dev: device that requests this phy
626 * @string: the phy name as given in the dt data or the name of the controller
627 * port for non-dt case
629 * Returns the phy driver, after getting a refcount to it; or
630 * -ENODEV if there is no such phy. The caller is responsible for
631 * calling phy_put() to release that count.
633 struct phy *phy_get(struct device *dev, const char *string)
638 if (string == NULL) {
639 dev_WARN(dev, "missing string\n");
640 return ERR_PTR(-EINVAL);
644 index = of_property_match_string(dev->of_node, "phy-names",
646 phy = _of_phy_get(dev->of_node, index);
648 phy = phy_find(dev, string);
653 if (!try_module_get(phy->ops->owner))
654 return ERR_PTR(-EPROBE_DEFER);
656 get_device(&phy->dev);
660 EXPORT_SYMBOL_GPL(phy_get);
663 * phy_optional_get() - lookup and obtain a reference to an optional phy.
664 * @dev: device that requests this phy
665 * @string: the phy name as given in the dt data or the name of the controller
666 * port for non-dt case
668 * Returns the phy driver, after getting a refcount to it; or
669 * NULL if there is no such phy. The caller is responsible for
670 * calling phy_put() to release that count.
672 struct phy *phy_optional_get(struct device *dev, const char *string)
674 struct phy *phy = phy_get(dev, string);
676 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV))
681 EXPORT_SYMBOL_GPL(phy_optional_get);
684 * devm_phy_get() - lookup and obtain a reference to a phy.
685 * @dev: device that requests this phy
686 * @string: the phy name as given in the dt data or phy device name
689 * Gets the phy using phy_get(), and associates a device with it using
690 * devres. On driver detach, release function is invoked on the devres data,
691 * then, devres data is freed.
693 struct phy *devm_phy_get(struct device *dev, const char *string)
695 struct phy **ptr, *phy;
697 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
699 return ERR_PTR(-ENOMEM);
701 phy = phy_get(dev, string);
704 devres_add(dev, ptr);
711 EXPORT_SYMBOL_GPL(devm_phy_get);
714 * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
715 * @dev: device that requests this phy
716 * @string: the phy name as given in the dt data or phy device name
719 * Gets the phy using phy_get(), and associates a device with it using
720 * devres. On driver detach, release function is invoked on the devres
721 * data, then, devres data is freed. This differs to devm_phy_get() in
722 * that if the phy does not exist, it is not considered an error and
723 * -ENODEV will not be returned. Instead the NULL phy is returned,
724 * which can be passed to all other phy consumer calls.
726 struct phy *devm_phy_optional_get(struct device *dev, const char *string)
728 struct phy *phy = devm_phy_get(dev, string);
730 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV))
735 EXPORT_SYMBOL_GPL(devm_phy_optional_get);
738 * devm_of_phy_get() - lookup and obtain a reference to a phy.
739 * @dev: device that requests this phy
740 * @np: node containing the phy
741 * @con_id: name of the phy from device's point of view
743 * Gets the phy using of_phy_get(), and associates a device with it using
744 * devres. On driver detach, release function is invoked on the devres data,
745 * then, devres data is freed.
747 struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
750 struct phy **ptr, *phy;
752 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
754 return ERR_PTR(-ENOMEM);
756 phy = of_phy_get(np, con_id);
759 devres_add(dev, ptr);
766 EXPORT_SYMBOL_GPL(devm_of_phy_get);
769 * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
770 * @dev: device that requests this phy
771 * @np: node containing the phy
772 * @index: index of the phy
774 * Gets the phy using _of_phy_get(), then gets a refcount to it,
775 * and associates a device with it using devres. On driver detach,
776 * release function is invoked on the devres data,
777 * then, devres data is freed.
780 struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
783 struct phy **ptr, *phy;
785 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
787 return ERR_PTR(-ENOMEM);
789 phy = _of_phy_get(np, index);
795 if (!try_module_get(phy->ops->owner)) {
797 return ERR_PTR(-EPROBE_DEFER);
800 get_device(&phy->dev);
803 devres_add(dev, ptr);
807 EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
810 * phy_create() - create a new phy
811 * @dev: device that is creating the new phy
812 * @node: device node of the phy
813 * @ops: function pointers for performing phy operations
815 * Called to create a phy using phy framework.
817 struct phy *phy_create(struct device *dev, struct device_node *node,
818 const struct phy_ops *ops)
825 return ERR_PTR(-EINVAL);
827 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
829 return ERR_PTR(-ENOMEM);
831 id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
833 dev_err(dev, "unable to get id\n");
838 device_initialize(&phy->dev);
839 mutex_init(&phy->mutex);
841 phy->dev.class = phy_class;
842 phy->dev.parent = dev;
843 phy->dev.of_node = node ?: dev->of_node;
847 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
852 phy->pwr = regulator_get_optional(&phy->dev, "phy");
853 if (IS_ERR(phy->pwr)) {
854 ret = PTR_ERR(phy->pwr);
855 if (ret == -EPROBE_DEFER)
861 ret = device_add(&phy->dev);
865 if (pm_runtime_enabled(dev)) {
866 pm_runtime_enable(&phy->dev);
867 pm_runtime_no_callbacks(&phy->dev);
873 put_device(&phy->dev); /* calls phy_release() which frees resources */
880 EXPORT_SYMBOL_GPL(phy_create);
883 * devm_phy_create() - create a new phy
884 * @dev: device that is creating the new phy
885 * @node: device node of the phy
886 * @ops: function pointers for performing phy operations
888 * Creates a new PHY device adding it to the PHY class.
889 * While at that, it also associates the device with the phy using devres.
890 * On driver detach, release function is invoked on the devres data,
891 * then, devres data is freed.
893 struct phy *devm_phy_create(struct device *dev, struct device_node *node,
894 const struct phy_ops *ops)
896 struct phy **ptr, *phy;
898 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
900 return ERR_PTR(-ENOMEM);
902 phy = phy_create(dev, node, ops);
905 devres_add(dev, ptr);
912 EXPORT_SYMBOL_GPL(devm_phy_create);
915 * phy_destroy() - destroy the phy
916 * @phy: the phy to be destroyed
918 * Called to destroy the phy.
920 void phy_destroy(struct phy *phy)
922 pm_runtime_disable(&phy->dev);
923 device_unregister(&phy->dev);
925 EXPORT_SYMBOL_GPL(phy_destroy);
928 * devm_phy_destroy() - destroy the PHY
929 * @dev: device that wants to release this phy
930 * @phy: the phy returned by devm_phy_get()
932 * destroys the devres associated with this phy and invokes phy_destroy
933 * to destroy the phy.
935 void devm_phy_destroy(struct device *dev, struct phy *phy)
939 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
940 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
942 EXPORT_SYMBOL_GPL(devm_phy_destroy);
945 * __of_phy_provider_register() - create/register phy provider with the framework
946 * @dev: struct device of the phy provider
947 * @children: device node containing children (if different from dev->of_node)
948 * @owner: the module owner containing of_xlate
949 * @of_xlate: function pointer to obtain phy instance from phy provider
951 * Creates struct phy_provider from dev and of_xlate function pointer.
952 * This is used in the case of dt boot for finding the phy instance from
955 * If the PHY provider doesn't nest children directly but uses a separate
956 * child node to contain the individual children, the @children parameter
957 * can be used to override the default. If NULL, the default (dev->of_node)
958 * will be used. If non-NULL, the device node must be a child (or further
959 * descendant) of dev->of_node. Otherwise an ERR_PTR()-encoded -EINVAL
960 * error code is returned.
962 struct phy_provider *__of_phy_provider_register(struct device *dev,
963 struct device_node *children, struct module *owner,
964 struct phy * (*of_xlate)(struct device *dev,
965 struct of_phandle_args *args))
967 struct phy_provider *phy_provider;
970 * If specified, the device node containing the children must itself
971 * be the provider's device node or a child (or further descendant)
975 struct device_node *parent = of_node_get(children), *next;
978 if (parent == dev->of_node)
981 next = of_get_parent(parent);
987 return ERR_PTR(-EINVAL);
991 children = dev->of_node;
994 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
996 return ERR_PTR(-ENOMEM);
998 phy_provider->dev = dev;
999 phy_provider->children = of_node_get(children);
1000 phy_provider->owner = owner;
1001 phy_provider->of_xlate = of_xlate;
1003 mutex_lock(&phy_provider_mutex);
1004 list_add_tail(&phy_provider->list, &phy_provider_list);
1005 mutex_unlock(&phy_provider_mutex);
1007 return phy_provider;
1009 EXPORT_SYMBOL_GPL(__of_phy_provider_register);
1012 * __devm_of_phy_provider_register() - create/register phy provider with the
1014 * @dev: struct device of the phy provider
1015 * @owner: the module owner containing of_xlate
1016 * @of_xlate: function pointer to obtain phy instance from phy provider
1018 * Creates struct phy_provider from dev and of_xlate function pointer.
1019 * This is used in the case of dt boot for finding the phy instance from
1020 * phy provider. While at that, it also associates the device with the
1021 * phy provider using devres. On driver detach, release function is invoked
1022 * on the devres data, then, devres data is freed.
1024 struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
1025 struct device_node *children, struct module *owner,
1026 struct phy * (*of_xlate)(struct device *dev,
1027 struct of_phandle_args *args))
1029 struct phy_provider **ptr, *phy_provider;
1031 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
1033 return ERR_PTR(-ENOMEM);
1035 phy_provider = __of_phy_provider_register(dev, children, owner,
1037 if (!IS_ERR(phy_provider)) {
1038 *ptr = phy_provider;
1039 devres_add(dev, ptr);
1044 return phy_provider;
1046 EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);
1049 * of_phy_provider_unregister() - unregister phy provider from the framework
1050 * @phy_provider: phy provider returned by of_phy_provider_register()
1052 * Removes the phy_provider created using of_phy_provider_register().
1054 void of_phy_provider_unregister(struct phy_provider *phy_provider)
1056 if (IS_ERR(phy_provider))
1059 mutex_lock(&phy_provider_mutex);
1060 list_del(&phy_provider->list);
1061 of_node_put(phy_provider->children);
1062 kfree(phy_provider);
1063 mutex_unlock(&phy_provider_mutex);
1065 EXPORT_SYMBOL_GPL(of_phy_provider_unregister);
1068 * devm_of_phy_provider_unregister() - remove phy provider from the framework
1069 * @dev: struct device of the phy provider
1071 * destroys the devres associated with this phy provider and invokes
1072 * of_phy_provider_unregister to unregister the phy provider.
1074 void devm_of_phy_provider_unregister(struct device *dev,
1075 struct phy_provider *phy_provider) {
1078 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
1080 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
1082 EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
1085 * phy_release() - release the phy
1086 * @dev: the dev member within phy
1088 * When the last reference to the device is removed, it is called
1089 * from the embedded kobject as release method.
1091 static void phy_release(struct device *dev)
1096 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
1097 regulator_put(phy->pwr);
1098 ida_simple_remove(&phy_ida, phy->id);
1102 static int __init phy_core_init(void)
1104 phy_class = class_create(THIS_MODULE, "phy");
1105 if (IS_ERR(phy_class)) {
1106 pr_err("failed to create phy class --> %ld\n",
1107 PTR_ERR(phy_class));
1108 return PTR_ERR(phy_class);
1111 phy_class->dev_release = phy_release;
1115 device_initcall(phy_core_init);