| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * phy-core.c -- Generic Phy framework. |
| * |
| * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com |
| * |
| * Author: Kishon Vijay Abraham I <kishon@ti.com> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/export.h> |
| #include <linux/module.h> |
| #include <linux/err.h> |
| #include <linux/debugfs.h> |
| #include <linux/device.h> |
| #include <linux/slab.h> |
| #include <linux/of.h> |
| #include <linux/phy/phy.h> |
| #include <linux/idr.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/regulator/consumer.h> |
| |
| static void phy_release(struct device *dev); |
| static const struct class phy_class = { |
| .name = "phy", |
| .dev_release = phy_release, |
| }; |
| |
| static struct dentry *phy_debugfs_root; |
| static DEFINE_MUTEX(phy_provider_mutex); |
| static LIST_HEAD(phy_provider_list); |
| static LIST_HEAD(phys); |
| static DEFINE_IDA(phy_ida); |
| |
| static void devm_phy_release(struct device *dev, void *res) |
| { |
| struct phy *phy = *(struct phy **)res; |
| |
| phy_put(dev, phy); |
| } |
| |
| static void devm_phy_provider_release(struct device *dev, void *res) |
| { |
| struct phy_provider *phy_provider = *(struct phy_provider **)res; |
| |
| of_phy_provider_unregister(phy_provider); |
| } |
| |
| static void devm_phy_consume(struct device *dev, void *res) |
| { |
| struct phy *phy = *(struct phy **)res; |
| |
| phy_destroy(phy); |
| } |
| |
| static int devm_phy_match(struct device *dev, void *res, void *match_data) |
| { |
| struct phy **phy = res; |
| |
| return *phy == match_data; |
| } |
| |
| /** |
| * phy_create_lookup() - allocate and register PHY/device association |
| * @phy: the phy of the association |
| * @con_id: connection ID string on device |
| * @dev_id: the device of the association |
| * |
| * Creates and registers phy_lookup entry. |
| */ |
| int phy_create_lookup(struct phy *phy, const char *con_id, const char *dev_id) |
| { |
| struct phy_lookup *pl; |
| |
| if (!phy || !dev_id || !con_id) |
| return -EINVAL; |
| |
| pl = kzalloc(sizeof(*pl), GFP_KERNEL); |
| if (!pl) |
| return -ENOMEM; |
| |
| pl->dev_id = dev_id; |
| pl->con_id = con_id; |
| pl->phy = phy; |
| |
| mutex_lock(&phy_provider_mutex); |
| list_add_tail(&pl->node, &phys); |
| mutex_unlock(&phy_provider_mutex); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(phy_create_lookup); |
| |
| /** |
| * phy_remove_lookup() - find and remove PHY/device association |
| * @phy: the phy of the association |
| * @con_id: connection ID string on device |
| * @dev_id: the device of the association |
| * |
| * Finds and unregisters phy_lookup entry that was created with |
| * phy_create_lookup(). |
| */ |
| void phy_remove_lookup(struct phy *phy, const char *con_id, const char *dev_id) |
| { |
| struct phy_lookup *pl; |
| |
| if (!phy || !dev_id || !con_id) |
| return; |
| |
| mutex_lock(&phy_provider_mutex); |
| list_for_each_entry(pl, &phys, node) |
| if (pl->phy == phy && !strcmp(pl->dev_id, dev_id) && |
| !strcmp(pl->con_id, con_id)) { |
| list_del(&pl->node); |
| kfree(pl); |
| break; |
| } |
| mutex_unlock(&phy_provider_mutex); |
| } |
| EXPORT_SYMBOL_GPL(phy_remove_lookup); |
| |
| static struct phy *phy_find(struct device *dev, const char *con_id) |
| { |
| const char *dev_id = dev_name(dev); |
| struct phy_lookup *p, *pl = NULL; |
| |
| mutex_lock(&phy_provider_mutex); |
| list_for_each_entry(p, &phys, node) |
| if (!strcmp(p->dev_id, dev_id) && !strcmp(p->con_id, con_id)) { |
| pl = p; |
| break; |
| } |
| mutex_unlock(&phy_provider_mutex); |
| |
| return pl ? pl->phy : ERR_PTR(-ENODEV); |
| } |
| |
| static struct phy_provider *of_phy_provider_lookup(struct device_node *node) |
| { |
| struct phy_provider *phy_provider; |
| struct device_node *child; |
| |
| list_for_each_entry(phy_provider, &phy_provider_list, list) { |
| if (phy_provider->dev->of_node == node) |
| return phy_provider; |
| |
| for_each_child_of_node(phy_provider->children, child) |
| if (child == node) |
| return phy_provider; |
| } |
| |
| return ERR_PTR(-EPROBE_DEFER); |
| } |
| |
| int phy_pm_runtime_get(struct phy *phy) |
| { |
| int ret; |
| |
| if (!phy) |
| return 0; |
| |
| if (!pm_runtime_enabled(&phy->dev)) |
| return -ENOTSUPP; |
| |
| ret = pm_runtime_get(&phy->dev); |
| if (ret < 0 && ret != -EINPROGRESS) |
| pm_runtime_put_noidle(&phy->dev); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_pm_runtime_get); |
| |
| int phy_pm_runtime_get_sync(struct phy *phy) |
| { |
| int ret; |
| |
| if (!phy) |
| return 0; |
| |
| if (!pm_runtime_enabled(&phy->dev)) |
| return -ENOTSUPP; |
| |
| ret = pm_runtime_get_sync(&phy->dev); |
| if (ret < 0) |
| pm_runtime_put_sync(&phy->dev); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync); |
| |
| int phy_pm_runtime_put(struct phy *phy) |
| { |
| if (!phy) |
| return 0; |
| |
| if (!pm_runtime_enabled(&phy->dev)) |
| return -ENOTSUPP; |
| |
| return pm_runtime_put(&phy->dev); |
| } |
| EXPORT_SYMBOL_GPL(phy_pm_runtime_put); |
| |
| int phy_pm_runtime_put_sync(struct phy *phy) |
| { |
| if (!phy) |
| return 0; |
| |
| if (!pm_runtime_enabled(&phy->dev)) |
| return -ENOTSUPP; |
| |
| return pm_runtime_put_sync(&phy->dev); |
| } |
| EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync); |
| |
| void phy_pm_runtime_allow(struct phy *phy) |
| { |
| if (!phy) |
| return; |
| |
| if (!pm_runtime_enabled(&phy->dev)) |
| return; |
| |
| pm_runtime_allow(&phy->dev); |
| } |
| EXPORT_SYMBOL_GPL(phy_pm_runtime_allow); |
| |
| void phy_pm_runtime_forbid(struct phy *phy) |
| { |
| if (!phy) |
| return; |
| |
| if (!pm_runtime_enabled(&phy->dev)) |
| return; |
| |
| pm_runtime_forbid(&phy->dev); |
| } |
| EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid); |
| |
| /** |
| * phy_init - phy internal initialization before phy operation |
| * @phy: the phy returned by phy_get() |
| * |
| * Used to allow phy's driver to perform phy internal initialization, |
| * such as PLL block powering, clock initialization or anything that's |
| * is required by the phy to perform the start of operation. |
| * Must be called before phy_power_on(). |
| * |
| * Return: %0 if successful, a negative error code otherwise |
| */ |
| int phy_init(struct phy *phy) |
| { |
| int ret; |
| |
| if (!phy) |
| return 0; |
| |
| ret = phy_pm_runtime_get_sync(phy); |
| if (ret < 0 && ret != -ENOTSUPP) |
| return ret; |
| ret = 0; /* Override possible ret == -ENOTSUPP */ |
| |
| mutex_lock(&phy->mutex); |
| if (phy->power_count > phy->init_count) |
| dev_warn(&phy->dev, "phy_power_on was called before phy_init\n"); |
| |
| if (phy->init_count == 0 && phy->ops->init) { |
| ret = phy->ops->init(phy); |
| if (ret < 0) { |
| dev_err(&phy->dev, "phy init failed --> %d\n", ret); |
| goto out; |
| } |
| } |
| ++phy->init_count; |
| |
| out: |
| mutex_unlock(&phy->mutex); |
| phy_pm_runtime_put(phy); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_init); |
| |
| /** |
| * phy_exit - Phy internal un-initialization |
| * @phy: the phy returned by phy_get() |
| * |
| * Must be called after phy_power_off(). |
| * |
| * Return: %0 if successful, a negative error code otherwise |
| */ |
| int phy_exit(struct phy *phy) |
| { |
| int ret; |
| |
| if (!phy) |
| return 0; |
| |
| ret = phy_pm_runtime_get_sync(phy); |
| if (ret < 0 && ret != -ENOTSUPP) |
| return ret; |
| ret = 0; /* Override possible ret == -ENOTSUPP */ |
| |
| mutex_lock(&phy->mutex); |
| if (phy->init_count == 1 && phy->ops->exit) { |
| ret = phy->ops->exit(phy); |
| if (ret < 0) { |
| dev_err(&phy->dev, "phy exit failed --> %d\n", ret); |
| goto out; |
| } |
| } |
| --phy->init_count; |
| |
| out: |
| mutex_unlock(&phy->mutex); |
| phy_pm_runtime_put(phy); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_exit); |
| |
| /** |
| * phy_power_on - Enable the phy and enter proper operation |
| * @phy: the phy returned by phy_get() |
| * |
| * Must be called after phy_init(). |
| * |
| * Return: %0 if successful, a negative error code otherwise |
| */ |
| int phy_power_on(struct phy *phy) |
| { |
| int ret = 0; |
| |
| if (!phy) |
| goto out; |
| |
| if (phy->pwr) { |
| ret = regulator_enable(phy->pwr); |
| if (ret) |
| goto out; |
| } |
| |
| ret = phy_pm_runtime_get_sync(phy); |
| if (ret < 0 && ret != -ENOTSUPP) |
| goto err_pm_sync; |
| |
| ret = 0; /* Override possible ret == -ENOTSUPP */ |
| |
| mutex_lock(&phy->mutex); |
| if (phy->power_count == 0 && phy->ops->power_on) { |
| ret = phy->ops->power_on(phy); |
| if (ret < 0) { |
| dev_err(&phy->dev, "phy poweron failed --> %d\n", ret); |
| goto err_pwr_on; |
| } |
| } |
| ++phy->power_count; |
| mutex_unlock(&phy->mutex); |
| return 0; |
| |
| err_pwr_on: |
| mutex_unlock(&phy->mutex); |
| phy_pm_runtime_put_sync(phy); |
| err_pm_sync: |
| if (phy->pwr) |
| regulator_disable(phy->pwr); |
| out: |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_power_on); |
| |
| /** |
| * phy_power_off - Disable the phy. |
| * @phy: the phy returned by phy_get() |
| * |
| * Must be called before phy_exit(). |
| * |
| * Return: %0 if successful, a negative error code otherwise |
| */ |
| int phy_power_off(struct phy *phy) |
| { |
| int ret; |
| |
| if (!phy) |
| return 0; |
| |
| mutex_lock(&phy->mutex); |
| if (phy->power_count == 1 && phy->ops->power_off) { |
| ret = phy->ops->power_off(phy); |
| if (ret < 0) { |
| dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret); |
| mutex_unlock(&phy->mutex); |
| return ret; |
| } |
| } |
| --phy->power_count; |
| mutex_unlock(&phy->mutex); |
| phy_pm_runtime_put(phy); |
| |
| if (phy->pwr) |
| regulator_disable(phy->pwr); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(phy_power_off); |
| |
| int phy_set_mode_ext(struct phy *phy, enum phy_mode mode, int submode) |
| { |
| int ret; |
| |
| if (!phy || !phy->ops->set_mode) |
| return 0; |
| |
| mutex_lock(&phy->mutex); |
| ret = phy->ops->set_mode(phy, mode, submode); |
| if (!ret) |
| phy->attrs.mode = mode; |
| mutex_unlock(&phy->mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_set_mode_ext); |
| |
| int phy_set_media(struct phy *phy, enum phy_media media) |
| { |
| int ret; |
| |
| if (!phy || !phy->ops->set_media) |
| return 0; |
| |
| mutex_lock(&phy->mutex); |
| ret = phy->ops->set_media(phy, media); |
| mutex_unlock(&phy->mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_set_media); |
| |
| int phy_set_speed(struct phy *phy, int speed) |
| { |
| int ret; |
| |
| if (!phy || !phy->ops->set_speed) |
| return 0; |
| |
| mutex_lock(&phy->mutex); |
| ret = phy->ops->set_speed(phy, speed); |
| mutex_unlock(&phy->mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_set_speed); |
| |
| int phy_reset(struct phy *phy) |
| { |
| int ret; |
| |
| if (!phy || !phy->ops->reset) |
| return 0; |
| |
| ret = phy_pm_runtime_get_sync(phy); |
| if (ret < 0 && ret != -ENOTSUPP) |
| return ret; |
| |
| mutex_lock(&phy->mutex); |
| ret = phy->ops->reset(phy); |
| mutex_unlock(&phy->mutex); |
| |
| phy_pm_runtime_put(phy); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_reset); |
| |
| /** |
| * phy_calibrate() - Tunes the phy hw parameters for current configuration |
| * @phy: the phy returned by phy_get() |
| * |
| * Used to calibrate phy hardware, typically by adjusting some parameters in |
| * runtime, which are otherwise lost after host controller reset and cannot |
| * be applied in phy_init() or phy_power_on(). |
| * |
| * Return: %0 if successful, a negative error code otherwise |
| */ |
| int phy_calibrate(struct phy *phy) |
| { |
| int ret; |
| |
| if (!phy || !phy->ops->calibrate) |
| return 0; |
| |
| mutex_lock(&phy->mutex); |
| ret = phy->ops->calibrate(phy); |
| mutex_unlock(&phy->mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_calibrate); |
| |
| /** |
| * phy_notify_connect() - phy connect notification |
| * @phy: the phy returned by phy_get() |
| * @port: the port index for connect |
| * |
| * If the phy needs to get connection status, the callback can be used. |
| * Returns: %0 if successful, a negative error code otherwise |
| */ |
| int phy_notify_connect(struct phy *phy, int port) |
| { |
| int ret; |
| |
| if (!phy || !phy->ops->connect) |
| return 0; |
| |
| mutex_lock(&phy->mutex); |
| ret = phy->ops->connect(phy, port); |
| mutex_unlock(&phy->mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_notify_connect); |
| |
| /** |
| * phy_notify_disconnect() - phy disconnect notification |
| * @phy: the phy returned by phy_get() |
| * @port: the port index for disconnect |
| * |
| * If the phy needs to get connection status, the callback can be used. |
| * |
| * Returns: %0 if successful, a negative error code otherwise |
| */ |
| int phy_notify_disconnect(struct phy *phy, int port) |
| { |
| int ret; |
| |
| if (!phy || !phy->ops->disconnect) |
| return 0; |
| |
| mutex_lock(&phy->mutex); |
| ret = phy->ops->disconnect(phy, port); |
| mutex_unlock(&phy->mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_notify_disconnect); |
| |
| /** |
| * phy_configure() - Changes the phy parameters |
| * @phy: the phy returned by phy_get() |
| * @opts: New configuration to apply |
| * |
| * Used to change the PHY parameters. phy_init() must have been called |
| * on the phy. The configuration will be applied on the current phy |
| * mode, that can be changed using phy_set_mode(). |
| * |
| * Return: %0 if successful, a negative error code otherwise |
| */ |
| int phy_configure(struct phy *phy, union phy_configure_opts *opts) |
| { |
| int ret; |
| |
| if (!phy) |
| return -EINVAL; |
| |
| if (!phy->ops->configure) |
| return -EOPNOTSUPP; |
| |
| mutex_lock(&phy->mutex); |
| ret = phy->ops->configure(phy, opts); |
| mutex_unlock(&phy->mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_configure); |
| |
| /** |
| * phy_validate() - Checks the phy parameters |
| * @phy: the phy returned by phy_get() |
| * @mode: phy_mode the configuration is applicable to. |
| * @submode: PHY submode the configuration is applicable to. |
| * @opts: Configuration to check |
| * |
| * Used to check that the current set of parameters can be handled by |
| * the phy. Implementations are free to tune the parameters passed as |
| * arguments if needed by some implementation detail or |
| * constraints. It will not change any actual configuration of the |
| * PHY, so calling it as many times as deemed fit will have no side |
| * effect. |
| * |
| * Return: %0 if successful, a negative error code otherwise |
| */ |
| int phy_validate(struct phy *phy, enum phy_mode mode, int submode, |
| union phy_configure_opts *opts) |
| { |
| int ret; |
| |
| if (!phy) |
| return -EINVAL; |
| |
| if (!phy->ops->validate) |
| return -EOPNOTSUPP; |
| |
| mutex_lock(&phy->mutex); |
| ret = phy->ops->validate(phy, mode, submode, opts); |
| mutex_unlock(&phy->mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(phy_validate); |
| |
| /** |
| * _of_phy_get() - lookup and obtain a reference to a phy by phandle |
| * @np: device_node for which to get the phy |
| * @index: the index of the phy |
| * |
| * Returns the phy associated with the given phandle value, |
| * after getting a refcount to it or -ENODEV if there is no such phy or |
| * -EPROBE_DEFER if there is a phandle to the phy, but the device is |
| * not yet loaded. This function uses of_xlate call back function provided |
| * while registering the phy_provider to find the phy instance. |
| */ |
| static struct phy *_of_phy_get(struct device_node *np, int index) |
| { |
| int ret; |
| struct phy_provider *phy_provider; |
| struct phy *phy = NULL; |
| struct of_phandle_args args; |
| |
| ret = of_parse_phandle_with_args(np, "phys", "#phy-cells", |
| index, &args); |
| if (ret) |
| return ERR_PTR(-ENODEV); |
| |
| /* This phy type handled by the usb-phy subsystem for now */ |
| if (of_device_is_compatible(args.np, "usb-nop-xceiv")) |
| return ERR_PTR(-ENODEV); |
| |
| mutex_lock(&phy_provider_mutex); |
| phy_provider = of_phy_provider_lookup(args.np); |
| if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) { |
| phy = ERR_PTR(-EPROBE_DEFER); |
| goto out_unlock; |
| } |
| |
| if (!of_device_is_available(args.np)) { |
| dev_warn(phy_provider->dev, "Requested PHY is disabled\n"); |
| phy = ERR_PTR(-ENODEV); |
| goto out_put_module; |
| } |
| |
| phy = phy_provider->of_xlate(phy_provider->dev, &args); |
| |
| out_put_module: |
| module_put(phy_provider->owner); |
| |
| out_unlock: |
| mutex_unlock(&phy_provider_mutex); |
| of_node_put(args.np); |
| |
| return phy; |
| } |
| |
| /** |
| * of_phy_get() - lookup and obtain a reference to a phy using a device_node. |
| * @np: device_node for which to get the phy |
| * @con_id: name of the phy from device's point of view |
| * |
| * Returns the phy driver, after getting a refcount to it; or |
| * -ENODEV if there is no such phy. The caller is responsible for |
| * calling phy_put() to release that count. |
| */ |
| struct phy *of_phy_get(struct device_node *np, const char *con_id) |
| { |
| struct phy *phy = NULL; |
| int index = 0; |
| |
| if (con_id) |
| index = of_property_match_string(np, "phy-names", con_id); |
| |
| phy = _of_phy_get(np, index); |
| if (IS_ERR(phy)) |
| return phy; |
| |
| if (!try_module_get(phy->ops->owner)) |
| return ERR_PTR(-EPROBE_DEFER); |
| |
| get_device(&phy->dev); |
| |
| return phy; |
| } |
| EXPORT_SYMBOL_GPL(of_phy_get); |
| |
| /** |
| * of_phy_put() - release the PHY |
| * @phy: the phy returned by of_phy_get() |
| * |
| * Releases a refcount the caller received from of_phy_get(). |
| */ |
| void of_phy_put(struct phy *phy) |
| { |
| if (!phy || IS_ERR(phy)) |
| return; |
| |
| mutex_lock(&phy->mutex); |
| if (phy->ops->release) |
| phy->ops->release(phy); |
| mutex_unlock(&phy->mutex); |
| |
| module_put(phy->ops->owner); |
| put_device(&phy->dev); |
| } |
| EXPORT_SYMBOL_GPL(of_phy_put); |
| |
| /** |
| * phy_put() - release the PHY |
| * @dev: device that wants to release this phy |
| * @phy: the phy returned by phy_get() |
| * |
| * Releases a refcount the caller received from phy_get(). |
| */ |
| void phy_put(struct device *dev, struct phy *phy) |
| { |
| device_link_remove(dev, &phy->dev); |
| of_phy_put(phy); |
| } |
| EXPORT_SYMBOL_GPL(phy_put); |
| |
| /** |
| * devm_phy_put() - release the PHY |
| * @dev: device that wants to release this phy |
| * @phy: the phy returned by devm_phy_get() |
| * |
| * destroys the devres associated with this phy and invokes phy_put |
| * to release the phy. |
| */ |
| void devm_phy_put(struct device *dev, struct phy *phy) |
| { |
| int r; |
| |
| if (!phy) |
| return; |
| |
| r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy); |
| dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); |
| } |
| EXPORT_SYMBOL_GPL(devm_phy_put); |
| |
| /** |
| * of_phy_simple_xlate() - returns the phy instance from phy provider |
| * @dev: the PHY provider device |
| * @args: of_phandle_args (not used here) |
| * |
| * Intended to be used by phy provider for the common case where #phy-cells is |
| * 0. For other cases where #phy-cells is greater than '0', the phy provider |
| * should provide a custom of_xlate function that reads the *args* and returns |
| * the appropriate phy. |
| */ |
| struct phy *of_phy_simple_xlate(struct device *dev, |
| const struct of_phandle_args *args) |
| { |
| struct phy *phy; |
| struct class_dev_iter iter; |
| |
| class_dev_iter_init(&iter, &phy_class, NULL, NULL); |
| while ((dev = class_dev_iter_next(&iter))) { |
| phy = to_phy(dev); |
| if (args->np != phy->dev.of_node) |
| continue; |
| |
| class_dev_iter_exit(&iter); |
| return phy; |
| } |
| |
| class_dev_iter_exit(&iter); |
| return ERR_PTR(-ENODEV); |
| } |
| EXPORT_SYMBOL_GPL(of_phy_simple_xlate); |
| |
| /** |
| * phy_get() - lookup and obtain a reference to a phy. |
| * @dev: device that requests this phy |
| * @string: the phy name as given in the dt data or the name of the controller |
| * port for non-dt case |
| * |
| * Returns the phy driver, after getting a refcount to it; or |
| * -ENODEV if there is no such phy. The caller is responsible for |
| * calling phy_put() to release that count. |
| */ |
| struct phy *phy_get(struct device *dev, const char *string) |
| { |
| int index = 0; |
| struct phy *phy; |
| struct device_link *link; |
| |
| if (dev->of_node) { |
| if (string) |
| index = of_property_match_string(dev->of_node, "phy-names", |
| string); |
| else |
| index = 0; |
| phy = _of_phy_get(dev->of_node, index); |
| } else { |
| if (string == NULL) { |
| dev_WARN(dev, "missing string\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| phy = phy_find(dev, string); |
| } |
| if (IS_ERR(phy)) |
| return phy; |
| |
| if (!try_module_get(phy->ops->owner)) |
| return ERR_PTR(-EPROBE_DEFER); |
| |
| get_device(&phy->dev); |
| |
| link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS); |
| if (!link) |
| dev_dbg(dev, "failed to create device link to %s\n", |
| dev_name(phy->dev.parent)); |
| |
| return phy; |
| } |
| EXPORT_SYMBOL_GPL(phy_get); |
| |
| /** |
| * devm_phy_get() - lookup and obtain a reference to a phy. |
| * @dev: device that requests this phy |
| * @string: the phy name as given in the dt data or phy device name |
| * for non-dt case |
| * |
| * Gets the phy using phy_get(), and associates a device with it using |
| * devres. On driver detach, release function is invoked on the devres data, |
| * then, devres data is freed. |
| */ |
| struct phy *devm_phy_get(struct device *dev, const char *string) |
| { |
| struct phy **ptr, *phy; |
| |
| ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return ERR_PTR(-ENOMEM); |
| |
| phy = phy_get(dev, string); |
| if (!IS_ERR(phy)) { |
| *ptr = phy; |
| devres_add(dev, ptr); |
| } else { |
| devres_free(ptr); |
| } |
| |
| return phy; |
| } |
| EXPORT_SYMBOL_GPL(devm_phy_get); |
| |
| /** |
| * devm_phy_optional_get() - lookup and obtain a reference to an optional phy. |
| * @dev: device that requests this phy |
| * @string: the phy name as given in the dt data or phy device name |
| * for non-dt case |
| * |
| * Gets the phy using phy_get(), and associates a device with it using |
| * devres. On driver detach, release function is invoked on the devres |
| * data, then, devres data is freed. This differs to devm_phy_get() in |
| * that if the phy does not exist, it is not considered an error and |
| * -ENODEV will not be returned. Instead the NULL phy is returned, |
| * which can be passed to all other phy consumer calls. |
| */ |
| struct phy *devm_phy_optional_get(struct device *dev, const char *string) |
| { |
| struct phy *phy = devm_phy_get(dev, string); |
| |
| if (PTR_ERR(phy) == -ENODEV) |
| phy = NULL; |
| |
| return phy; |
| } |
| EXPORT_SYMBOL_GPL(devm_phy_optional_get); |
| |
| /** |
| * devm_of_phy_get() - lookup and obtain a reference to a phy. |
| * @dev: device that requests this phy |
| * @np: node containing the phy |
| * @con_id: name of the phy from device's point of view |
| * |
| * Gets the phy using of_phy_get(), and associates a device with it using |
| * devres. On driver detach, release function is invoked on the devres data, |
| * then, devres data is freed. |
| */ |
| struct phy *devm_of_phy_get(struct device *dev, struct device_node *np, |
| const char *con_id) |
| { |
| struct phy **ptr, *phy; |
| struct device_link *link; |
| |
| ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return ERR_PTR(-ENOMEM); |
| |
| phy = of_phy_get(np, con_id); |
| if (!IS_ERR(phy)) { |
| *ptr = phy; |
| devres_add(dev, ptr); |
| } else { |
| devres_free(ptr); |
| return phy; |
| } |
| |
| link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS); |
| if (!link) |
| dev_dbg(dev, "failed to create device link to %s\n", |
| dev_name(phy->dev.parent)); |
| |
| return phy; |
| } |
| EXPORT_SYMBOL_GPL(devm_of_phy_get); |
| |
| /** |
| * devm_of_phy_optional_get() - lookup and obtain a reference to an optional |
| * phy. |
| * @dev: device that requests this phy |
| * @np: node containing the phy |
| * @con_id: name of the phy from device's point of view |
| * |
| * Gets the phy using of_phy_get(), and associates a device with it using |
| * devres. On driver detach, release function is invoked on the devres data, |
| * then, devres data is freed. This differs to devm_of_phy_get() in |
| * that if the phy does not exist, it is not considered an error and |
| * -ENODEV will not be returned. Instead the NULL phy is returned, |
| * which can be passed to all other phy consumer calls. |
| */ |
| struct phy *devm_of_phy_optional_get(struct device *dev, struct device_node *np, |
| const char *con_id) |
| { |
| struct phy *phy = devm_of_phy_get(dev, np, con_id); |
| |
| if (PTR_ERR(phy) == -ENODEV) |
| phy = NULL; |
| |
| if (IS_ERR(phy)) |
| dev_err_probe(dev, PTR_ERR(phy), "failed to get PHY %pOF:%s", |
| np, con_id); |
| |
| return phy; |
| } |
| EXPORT_SYMBOL_GPL(devm_of_phy_optional_get); |
| |
| /** |
| * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index. |
| * @dev: device that requests this phy |
| * @np: node containing the phy |
| * @index: index of the phy |
| * |
| * Gets the phy using _of_phy_get(), then gets a refcount to it, |
| * and associates a device with it using devres. On driver detach, |
| * release function is invoked on the devres data, |
| * then, devres data is freed. |
| * |
| */ |
| struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np, |
| int index) |
| { |
| struct phy **ptr, *phy; |
| struct device_link *link; |
| |
| ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return ERR_PTR(-ENOMEM); |
| |
| phy = _of_phy_get(np, index); |
| if (IS_ERR(phy)) { |
| devres_free(ptr); |
| return phy; |
| } |
| |
| if (!try_module_get(phy->ops->owner)) { |
| devres_free(ptr); |
| return ERR_PTR(-EPROBE_DEFER); |
| } |
| |
| get_device(&phy->dev); |
| |
| *ptr = phy; |
| devres_add(dev, ptr); |
| |
| link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS); |
| if (!link) |
| dev_dbg(dev, "failed to create device link to %s\n", |
| dev_name(phy->dev.parent)); |
| |
| return phy; |
| } |
| EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index); |
| |
| /** |
| * phy_create() - create a new phy |
| * @dev: device that is creating the new phy |
| * @node: device node of the phy |
| * @ops: function pointers for performing phy operations |
| * |
| * Called to create a phy using phy framework. |
| */ |
| struct phy *phy_create(struct device *dev, struct device_node *node, |
| const struct phy_ops *ops) |
| { |
| int ret; |
| int id; |
| struct phy *phy; |
| |
| if (WARN_ON(!dev)) |
| return ERR_PTR(-EINVAL); |
| |
| phy = kzalloc(sizeof(*phy), GFP_KERNEL); |
| if (!phy) |
| return ERR_PTR(-ENOMEM); |
| |
| id = ida_alloc(&phy_ida, GFP_KERNEL); |
| if (id < 0) { |
| dev_err(dev, "unable to get id\n"); |
| ret = id; |
| goto free_phy; |
| } |
| |
| device_initialize(&phy->dev); |
| mutex_init(&phy->mutex); |
| |
| phy->dev.class = &phy_class; |
| phy->dev.parent = dev; |
| phy->dev.of_node = node ?: dev->of_node; |
| phy->id = id; |
| phy->ops = ops; |
| |
| ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id); |
| if (ret) |
| goto put_dev; |
| |
| /* phy-supply */ |
| phy->pwr = regulator_get_optional(&phy->dev, "phy"); |
| if (IS_ERR(phy->pwr)) { |
| ret = PTR_ERR(phy->pwr); |
| if (ret == -EPROBE_DEFER) |
| goto put_dev; |
| |
| phy->pwr = NULL; |
| } |
| |
| ret = device_add(&phy->dev); |
| if (ret) |
| goto put_dev; |
| |
| if (pm_runtime_enabled(dev)) { |
| pm_runtime_enable(&phy->dev); |
| pm_runtime_no_callbacks(&phy->dev); |
| } |
| |
| phy->debugfs = debugfs_create_dir(dev_name(&phy->dev), phy_debugfs_root); |
| |
| return phy; |
| |
| put_dev: |
| put_device(&phy->dev); /* calls phy_release() which frees resources */ |
| return ERR_PTR(ret); |
| |
| free_phy: |
| kfree(phy); |
| return ERR_PTR(ret); |
| } |
| EXPORT_SYMBOL_GPL(phy_create); |
| |
| /** |
| * devm_phy_create() - create a new phy |
| * @dev: device that is creating the new phy |
| * @node: device node of the phy |
| * @ops: function pointers for performing phy operations |
| * |
| * Creates a new PHY device adding it to the PHY class. |
| * While at that, it also associates the device with the phy using devres. |
| * On driver detach, release function is invoked on the devres data, |
| * then, devres data is freed. |
| */ |
| struct phy *devm_phy_create(struct device *dev, struct device_node *node, |
| const struct phy_ops *ops) |
| { |
| struct phy **ptr, *phy; |
| |
| ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return ERR_PTR(-ENOMEM); |
| |
| phy = phy_create(dev, node, ops); |
| if (!IS_ERR(phy)) { |
| *ptr = phy; |
| devres_add(dev, ptr); |
| } else { |
| devres_free(ptr); |
| } |
| |
| return phy; |
| } |
| EXPORT_SYMBOL_GPL(devm_phy_create); |
| |
| /** |
| * phy_destroy() - destroy the phy |
| * @phy: the phy to be destroyed |
| * |
| * Called to destroy the phy. |
| */ |
| void phy_destroy(struct phy *phy) |
| { |
| pm_runtime_disable(&phy->dev); |
| device_unregister(&phy->dev); |
| } |
| EXPORT_SYMBOL_GPL(phy_destroy); |
| |
| /** |
| * devm_phy_destroy() - destroy the PHY |
| * @dev: device that wants to release this phy |
| * @phy: the phy returned by devm_phy_get() |
| * |
| * destroys the devres associated with this phy and invokes phy_destroy |
| * to destroy the phy. |
| */ |
| void devm_phy_destroy(struct device *dev, struct phy *phy) |
| { |
| int r; |
| |
| r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy); |
| dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); |
| } |
| EXPORT_SYMBOL_GPL(devm_phy_destroy); |
| |
| /** |
| * __of_phy_provider_register() - create/register phy provider with the framework |
| * @dev: struct device of the phy provider |
| * @children: device node containing children (if different from dev->of_node) |
| * @owner: the module owner containing of_xlate |
| * @of_xlate: function pointer to obtain phy instance from phy provider |
| * |
| * Creates struct phy_provider from dev and of_xlate function pointer. |
| * This is used in the case of dt boot for finding the phy instance from |
| * phy provider. |
| * |
| * If the PHY provider doesn't nest children directly but uses a separate |
| * child node to contain the individual children, the @children parameter |
| * can be used to override the default. If NULL, the default (dev->of_node) |
| * will be used. If non-NULL, the device node must be a child (or further |
| * descendant) of dev->of_node. Otherwise an ERR_PTR()-encoded -EINVAL |
| * error code is returned. |
| */ |
| struct phy_provider *__of_phy_provider_register(struct device *dev, |
| struct device_node *children, struct module *owner, |
| struct phy * (*of_xlate)(struct device *dev, |
| const struct of_phandle_args *args)) |
| { |
| struct phy_provider *phy_provider; |
| |
| /* |
| * If specified, the device node containing the children must itself |
| * be the provider's device node or a child (or further descendant) |
| * thereof. |
| */ |
| if (children) { |
| struct device_node *parent = of_node_get(children), *next; |
| |
| while (parent) { |
| if (parent == dev->of_node) |
| break; |
| |
| next = of_get_parent(parent); |
| of_node_put(parent); |
| parent = next; |
| } |
| |
| if (!parent) |
| return ERR_PTR(-EINVAL); |
| |
| of_node_put(parent); |
| } else { |
| children = dev->of_node; |
| } |
| |
| phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL); |
| if (!phy_provider) |
| return ERR_PTR(-ENOMEM); |
| |
| phy_provider->dev = dev; |
| phy_provider->children = of_node_get(children); |
| phy_provider->owner = owner; |
| phy_provider->of_xlate = of_xlate; |
| |
| mutex_lock(&phy_provider_mutex); |
| list_add_tail(&phy_provider->list, &phy_provider_list); |
| mutex_unlock(&phy_provider_mutex); |
| |
| return phy_provider; |
| } |
| EXPORT_SYMBOL_GPL(__of_phy_provider_register); |
| |
| /** |
| * __devm_of_phy_provider_register() - create/register phy provider with the |
| * framework |
| * @dev: struct device of the phy provider |
| * @children: device node containing children (if different from dev->of_node) |
| * @owner: the module owner containing of_xlate |
| * @of_xlate: function pointer to obtain phy instance from phy provider |
| * |
| * Creates struct phy_provider from dev and of_xlate function pointer. |
| * This is used in the case of dt boot for finding the phy instance from |
| * phy provider. While at that, it also associates the device with the |
| * phy provider using devres. On driver detach, release function is invoked |
| * on the devres data, then, devres data is freed. |
| */ |
| struct phy_provider *__devm_of_phy_provider_register(struct device *dev, |
| struct device_node *children, struct module *owner, |
| struct phy * (*of_xlate)(struct device *dev, |
| const struct of_phandle_args *args)) |
| { |
| struct phy_provider **ptr, *phy_provider; |
| |
| ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return ERR_PTR(-ENOMEM); |
| |
| phy_provider = __of_phy_provider_register(dev, children, owner, |
| of_xlate); |
| if (!IS_ERR(phy_provider)) { |
| *ptr = phy_provider; |
| devres_add(dev, ptr); |
| } else { |
| devres_free(ptr); |
| } |
| |
| return phy_provider; |
| } |
| EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register); |
| |
| /** |
| * of_phy_provider_unregister() - unregister phy provider from the framework |
| * @phy_provider: phy provider returned by of_phy_provider_register() |
| * |
| * Removes the phy_provider created using of_phy_provider_register(). |
| */ |
| void of_phy_provider_unregister(struct phy_provider *phy_provider) |
| { |
| if (IS_ERR(phy_provider)) |
| return; |
| |
| mutex_lock(&phy_provider_mutex); |
| list_del(&phy_provider->list); |
| of_node_put(phy_provider->children); |
| kfree(phy_provider); |
| mutex_unlock(&phy_provider_mutex); |
| } |
| EXPORT_SYMBOL_GPL(of_phy_provider_unregister); |
| |
| /** |
| * devm_of_phy_provider_unregister() - remove phy provider from the framework |
| * @dev: struct device of the phy provider |
| * @phy_provider: phy provider returned by of_phy_provider_register() |
| * |
| * destroys the devres associated with this phy provider and invokes |
| * of_phy_provider_unregister to unregister the phy provider. |
| */ |
| void devm_of_phy_provider_unregister(struct device *dev, |
| struct phy_provider *phy_provider) |
| { |
| int r; |
| |
| r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match, |
| phy_provider); |
| dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n"); |
| } |
| EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister); |
| |
| /** |
| * phy_release() - release the phy |
| * @dev: the dev member within phy |
| * |
| * When the last reference to the device is removed, it is called |
| * from the embedded kobject as release method. |
| */ |
| static void phy_release(struct device *dev) |
| { |
| struct phy *phy; |
| |
| phy = to_phy(dev); |
| dev_vdbg(dev, "releasing '%s'\n", dev_name(dev)); |
| debugfs_remove_recursive(phy->debugfs); |
| regulator_put(phy->pwr); |
| ida_free(&phy_ida, phy->id); |
| kfree(phy); |
| } |
| |
| static int __init phy_core_init(void) |
| { |
| int err; |
| |
| err = class_register(&phy_class); |
| if (err) { |
| pr_err("failed to register phy class"); |
| return err; |
| } |
| |
| phy_debugfs_root = debugfs_create_dir("phy", NULL); |
| |
| return 0; |
| } |
| device_initcall(phy_core_init); |
| |
| static void __exit phy_core_exit(void) |
| { |
| debugfs_remove_recursive(phy_debugfs_root); |
| class_unregister(&phy_class); |
| } |
| module_exit(phy_core_exit); |