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1200 lines
28 KiB
1200 lines
28 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* phy-core.c -- Generic Phy framework. |
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* |
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* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com |
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* |
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* Author: Kishon Vijay Abraham I <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/export.h> |
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#include <linux/module.h> |
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#include <linux/err.h> |
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#include <linux/device.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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#include <linux/phy/phy.h> |
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#include <linux/idr.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/regulator/consumer.h> |
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static struct class *phy_class; |
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static DEFINE_MUTEX(phy_provider_mutex); |
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static LIST_HEAD(phy_provider_list); |
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static LIST_HEAD(phys); |
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static DEFINE_IDA(phy_ida); |
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static void devm_phy_release(struct device *dev, void *res) |
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{ |
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struct phy *phy = *(struct phy **)res; |
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phy_put(dev, phy); |
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} |
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static void devm_phy_provider_release(struct device *dev, void *res) |
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{ |
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struct phy_provider *phy_provider = *(struct phy_provider **)res; |
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of_phy_provider_unregister(phy_provider); |
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} |
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static void devm_phy_consume(struct device *dev, void *res) |
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{ |
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struct phy *phy = *(struct phy **)res; |
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phy_destroy(phy); |
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} |
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static int devm_phy_match(struct device *dev, void *res, void *match_data) |
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{ |
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struct phy **phy = res; |
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return *phy == match_data; |
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} |
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/** |
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* phy_create_lookup() - allocate and register PHY/device association |
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* @phy: the phy of the association |
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* @con_id: connection ID string on device |
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* @dev_id: the device of the association |
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* |
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* Creates and registers phy_lookup entry. |
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*/ |
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int phy_create_lookup(struct phy *phy, const char *con_id, const char *dev_id) |
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{ |
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struct phy_lookup *pl; |
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if (!phy || !dev_id || !con_id) |
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return -EINVAL; |
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pl = kzalloc(sizeof(*pl), GFP_KERNEL); |
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if (!pl) |
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return -ENOMEM; |
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pl->dev_id = dev_id; |
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pl->con_id = con_id; |
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pl->phy = phy; |
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mutex_lock(&phy_provider_mutex); |
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list_add_tail(&pl->node, &phys); |
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mutex_unlock(&phy_provider_mutex); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(phy_create_lookup); |
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/** |
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* phy_remove_lookup() - find and remove PHY/device association |
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* @phy: the phy of the association |
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* @con_id: connection ID string on device |
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* @dev_id: the device of the association |
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* |
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* Finds and unregisters phy_lookup entry that was created with |
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* phy_create_lookup(). |
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*/ |
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void phy_remove_lookup(struct phy *phy, const char *con_id, const char *dev_id) |
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{ |
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struct phy_lookup *pl; |
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if (!phy || !dev_id || !con_id) |
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return; |
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mutex_lock(&phy_provider_mutex); |
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list_for_each_entry(pl, &phys, node) |
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if (pl->phy == phy && !strcmp(pl->dev_id, dev_id) && |
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!strcmp(pl->con_id, con_id)) { |
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list_del(&pl->node); |
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kfree(pl); |
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break; |
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} |
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mutex_unlock(&phy_provider_mutex); |
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} |
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EXPORT_SYMBOL_GPL(phy_remove_lookup); |
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static struct phy *phy_find(struct device *dev, const char *con_id) |
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{ |
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const char *dev_id = dev_name(dev); |
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struct phy_lookup *p, *pl = NULL; |
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mutex_lock(&phy_provider_mutex); |
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list_for_each_entry(p, &phys, node) |
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if (!strcmp(p->dev_id, dev_id) && !strcmp(p->con_id, con_id)) { |
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pl = p; |
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break; |
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} |
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mutex_unlock(&phy_provider_mutex); |
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return pl ? pl->phy : ERR_PTR(-ENODEV); |
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} |
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static struct phy_provider *of_phy_provider_lookup(struct device_node *node) |
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{ |
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struct phy_provider *phy_provider; |
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struct device_node *child; |
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list_for_each_entry(phy_provider, &phy_provider_list, list) { |
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if (phy_provider->dev->of_node == node) |
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return phy_provider; |
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for_each_child_of_node(phy_provider->children, child) |
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if (child == node) |
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return phy_provider; |
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} |
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return ERR_PTR(-EPROBE_DEFER); |
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} |
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int phy_pm_runtime_get(struct phy *phy) |
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{ |
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int ret; |
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if (!phy) |
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return 0; |
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if (!pm_runtime_enabled(&phy->dev)) |
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return -ENOTSUPP; |
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ret = pm_runtime_get(&phy->dev); |
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if (ret < 0 && ret != -EINPROGRESS) |
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pm_runtime_put_noidle(&phy->dev); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_pm_runtime_get); |
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int phy_pm_runtime_get_sync(struct phy *phy) |
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{ |
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int ret; |
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if (!phy) |
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return 0; |
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if (!pm_runtime_enabled(&phy->dev)) |
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return -ENOTSUPP; |
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ret = pm_runtime_get_sync(&phy->dev); |
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if (ret < 0) |
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pm_runtime_put_sync(&phy->dev); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync); |
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int phy_pm_runtime_put(struct phy *phy) |
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{ |
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if (!phy) |
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return 0; |
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if (!pm_runtime_enabled(&phy->dev)) |
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return -ENOTSUPP; |
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return pm_runtime_put(&phy->dev); |
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} |
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EXPORT_SYMBOL_GPL(phy_pm_runtime_put); |
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int phy_pm_runtime_put_sync(struct phy *phy) |
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{ |
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if (!phy) |
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return 0; |
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if (!pm_runtime_enabled(&phy->dev)) |
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return -ENOTSUPP; |
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return pm_runtime_put_sync(&phy->dev); |
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} |
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EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync); |
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void phy_pm_runtime_allow(struct phy *phy) |
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{ |
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if (!phy) |
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return; |
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if (!pm_runtime_enabled(&phy->dev)) |
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return; |
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pm_runtime_allow(&phy->dev); |
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} |
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EXPORT_SYMBOL_GPL(phy_pm_runtime_allow); |
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void phy_pm_runtime_forbid(struct phy *phy) |
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{ |
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if (!phy) |
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return; |
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if (!pm_runtime_enabled(&phy->dev)) |
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return; |
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pm_runtime_forbid(&phy->dev); |
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} |
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EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid); |
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int phy_init(struct phy *phy) |
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{ |
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int ret; |
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if (!phy) |
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return 0; |
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ret = phy_pm_runtime_get_sync(phy); |
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if (ret < 0 && ret != -ENOTSUPP) |
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return ret; |
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ret = 0; /* Override possible ret == -ENOTSUPP */ |
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mutex_lock(&phy->mutex); |
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if (phy->init_count == 0 && phy->ops->init) { |
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ret = phy->ops->init(phy); |
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if (ret < 0) { |
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dev_err(&phy->dev, "phy init failed --> %d\n", ret); |
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goto out; |
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} |
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} |
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++phy->init_count; |
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out: |
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mutex_unlock(&phy->mutex); |
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phy_pm_runtime_put(phy); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_init); |
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int phy_exit(struct phy *phy) |
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{ |
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int ret; |
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if (!phy) |
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return 0; |
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ret = phy_pm_runtime_get_sync(phy); |
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if (ret < 0 && ret != -ENOTSUPP) |
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return ret; |
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ret = 0; /* Override possible ret == -ENOTSUPP */ |
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mutex_lock(&phy->mutex); |
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if (phy->init_count == 1 && phy->ops->exit) { |
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ret = phy->ops->exit(phy); |
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if (ret < 0) { |
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dev_err(&phy->dev, "phy exit failed --> %d\n", ret); |
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goto out; |
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} |
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} |
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--phy->init_count; |
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out: |
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mutex_unlock(&phy->mutex); |
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phy_pm_runtime_put(phy); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_exit); |
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int phy_power_on(struct phy *phy) |
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{ |
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int ret = 0; |
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if (!phy) |
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goto out; |
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if (phy->pwr) { |
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ret = regulator_enable(phy->pwr); |
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if (ret) |
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goto out; |
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} |
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ret = phy_pm_runtime_get_sync(phy); |
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if (ret < 0 && ret != -ENOTSUPP) |
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goto err_pm_sync; |
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ret = 0; /* Override possible ret == -ENOTSUPP */ |
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mutex_lock(&phy->mutex); |
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if (phy->power_count == 0 && phy->ops->power_on) { |
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ret = phy->ops->power_on(phy); |
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if (ret < 0) { |
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dev_err(&phy->dev, "phy poweron failed --> %d\n", ret); |
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goto err_pwr_on; |
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} |
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} |
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++phy->power_count; |
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mutex_unlock(&phy->mutex); |
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return 0; |
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err_pwr_on: |
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mutex_unlock(&phy->mutex); |
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phy_pm_runtime_put_sync(phy); |
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err_pm_sync: |
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if (phy->pwr) |
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regulator_disable(phy->pwr); |
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out: |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_power_on); |
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int phy_power_off(struct phy *phy) |
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{ |
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int ret; |
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if (!phy) |
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return 0; |
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mutex_lock(&phy->mutex); |
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if (phy->power_count == 1 && phy->ops->power_off) { |
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ret = phy->ops->power_off(phy); |
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if (ret < 0) { |
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dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret); |
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mutex_unlock(&phy->mutex); |
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return ret; |
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} |
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} |
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--phy->power_count; |
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mutex_unlock(&phy->mutex); |
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phy_pm_runtime_put(phy); |
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if (phy->pwr) |
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regulator_disable(phy->pwr); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(phy_power_off); |
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int phy_set_mode_ext(struct phy *phy, enum phy_mode mode, int submode) |
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{ |
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int ret; |
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if (!phy || !phy->ops->set_mode) |
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return 0; |
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mutex_lock(&phy->mutex); |
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ret = phy->ops->set_mode(phy, mode, submode); |
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if (!ret) |
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phy->attrs.mode = mode; |
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mutex_unlock(&phy->mutex); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_set_mode_ext); |
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int phy_set_media(struct phy *phy, enum phy_media media) |
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{ |
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int ret; |
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if (!phy || !phy->ops->set_media) |
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return 0; |
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mutex_lock(&phy->mutex); |
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ret = phy->ops->set_media(phy, media); |
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mutex_unlock(&phy->mutex); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_set_media); |
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int phy_set_speed(struct phy *phy, int speed) |
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{ |
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int ret; |
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if (!phy || !phy->ops->set_speed) |
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return 0; |
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mutex_lock(&phy->mutex); |
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ret = phy->ops->set_speed(phy, speed); |
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mutex_unlock(&phy->mutex); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_set_speed); |
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int phy_reset(struct phy *phy) |
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{ |
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int ret; |
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if (!phy || !phy->ops->reset) |
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return 0; |
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ret = phy_pm_runtime_get_sync(phy); |
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if (ret < 0 && ret != -ENOTSUPP) |
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return ret; |
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mutex_lock(&phy->mutex); |
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ret = phy->ops->reset(phy); |
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mutex_unlock(&phy->mutex); |
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phy_pm_runtime_put(phy); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_reset); |
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/** |
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* phy_calibrate() - Tunes the phy hw parameters for current configuration |
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* @phy: the phy returned by phy_get() |
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* |
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* Used to calibrate phy hardware, typically by adjusting some parameters in |
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* runtime, which are otherwise lost after host controller reset and cannot |
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* be applied in phy_init() or phy_power_on(). |
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* |
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* Returns: 0 if successful, an negative error code otherwise |
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*/ |
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int phy_calibrate(struct phy *phy) |
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{ |
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int ret; |
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if (!phy || !phy->ops->calibrate) |
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return 0; |
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mutex_lock(&phy->mutex); |
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ret = phy->ops->calibrate(phy); |
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mutex_unlock(&phy->mutex); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_calibrate); |
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/** |
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* phy_configure() - Changes the phy parameters |
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* @phy: the phy returned by phy_get() |
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* @opts: New configuration to apply |
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* |
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* Used to change the PHY parameters. phy_init() must have been called |
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* on the phy. The configuration will be applied on the current phy |
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* mode, that can be changed using phy_set_mode(). |
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* |
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* Returns: 0 if successful, an negative error code otherwise |
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*/ |
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int phy_configure(struct phy *phy, union phy_configure_opts *opts) |
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{ |
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int ret; |
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if (!phy) |
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return -EINVAL; |
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if (!phy->ops->configure) |
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return -EOPNOTSUPP; |
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mutex_lock(&phy->mutex); |
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ret = phy->ops->configure(phy, opts); |
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mutex_unlock(&phy->mutex); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_configure); |
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/** |
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* phy_validate() - Checks the phy parameters |
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* @phy: the phy returned by phy_get() |
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* @mode: phy_mode the configuration is applicable to. |
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* @submode: PHY submode the configuration is applicable to. |
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* @opts: Configuration to check |
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* |
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* Used to check that the current set of parameters can be handled by |
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* the phy. Implementations are free to tune the parameters passed as |
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* arguments if needed by some implementation detail or |
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* constraints. It will not change any actual configuration of the |
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* PHY, so calling it as many times as deemed fit will have no side |
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* effect. |
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* |
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* Returns: 0 if successful, an negative error code otherwise |
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*/ |
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int phy_validate(struct phy *phy, enum phy_mode mode, int submode, |
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union phy_configure_opts *opts) |
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{ |
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int ret; |
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if (!phy) |
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return -EINVAL; |
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if (!phy->ops->validate) |
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return -EOPNOTSUPP; |
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mutex_lock(&phy->mutex); |
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ret = phy->ops->validate(phy, mode, submode, opts); |
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mutex_unlock(&phy->mutex); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_validate); |
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/** |
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* _of_phy_get() - lookup and obtain a reference to a phy by phandle |
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* @np: device_node for which to get the phy |
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* @index: the index of the phy |
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* |
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* Returns the phy associated with the given phandle value, |
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* after getting a refcount to it or -ENODEV if there is no such phy or |
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* -EPROBE_DEFER if there is a phandle to the phy, but the device is |
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* not yet loaded. This function uses of_xlate call back function provided |
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* while registering the phy_provider to find the phy instance. |
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*/ |
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static struct phy *_of_phy_get(struct device_node *np, int index) |
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{ |
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int ret; |
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struct phy_provider *phy_provider; |
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struct phy *phy = NULL; |
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struct of_phandle_args args; |
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ret = of_parse_phandle_with_args(np, "phys", "#phy-cells", |
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index, &args); |
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if (ret) |
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return ERR_PTR(-ENODEV); |
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/* This phy type handled by the usb-phy subsystem for now */ |
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if (of_device_is_compatible(args.np, "usb-nop-xceiv")) |
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return ERR_PTR(-ENODEV); |
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mutex_lock(&phy_provider_mutex); |
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phy_provider = of_phy_provider_lookup(args.np); |
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if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) { |
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phy = ERR_PTR(-EPROBE_DEFER); |
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goto out_unlock; |
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} |
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if (!of_device_is_available(args.np)) { |
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dev_warn(phy_provider->dev, "Requested PHY is disabled\n"); |
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phy = ERR_PTR(-ENODEV); |
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goto out_put_module; |
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} |
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phy = phy_provider->of_xlate(phy_provider->dev, &args); |
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out_put_module: |
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module_put(phy_provider->owner); |
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out_unlock: |
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mutex_unlock(&phy_provider_mutex); |
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of_node_put(args.np); |
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return phy; |
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} |
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|
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/** |
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* of_phy_get() - lookup and obtain a reference to a phy using a device_node. |
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* @np: device_node for which to get the phy |
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* @con_id: name of the phy from device's point of view |
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* |
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* Returns the phy driver, after getting a refcount to it; or |
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* -ENODEV if there is no such phy. The caller is responsible for |
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* calling phy_put() to release that count. |
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*/ |
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struct phy *of_phy_get(struct device_node *np, const char *con_id) |
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{ |
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struct phy *phy = NULL; |
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int index = 0; |
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if (con_id) |
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index = of_property_match_string(np, "phy-names", con_id); |
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phy = _of_phy_get(np, index); |
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if (IS_ERR(phy)) |
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return phy; |
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if (!try_module_get(phy->ops->owner)) |
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return ERR_PTR(-EPROBE_DEFER); |
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get_device(&phy->dev); |
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return phy; |
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} |
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EXPORT_SYMBOL_GPL(of_phy_get); |
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|
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/** |
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* of_phy_put() - release the PHY |
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* @phy: the phy returned by of_phy_get() |
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* |
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* Releases a refcount the caller received from of_phy_get(). |
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*/ |
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void of_phy_put(struct phy *phy) |
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{ |
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if (!phy || IS_ERR(phy)) |
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return; |
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mutex_lock(&phy->mutex); |
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if (phy->ops->release) |
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phy->ops->release(phy); |
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mutex_unlock(&phy->mutex); |
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module_put(phy->ops->owner); |
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put_device(&phy->dev); |
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} |
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EXPORT_SYMBOL_GPL(of_phy_put); |
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|
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/** |
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* phy_put() - release the PHY |
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* @dev: device that wants to release this phy |
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* @phy: the phy returned by phy_get() |
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* |
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* Releases a refcount the caller received from phy_get(). |
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*/ |
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void phy_put(struct device *dev, struct phy *phy) |
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{ |
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device_link_remove(dev, &phy->dev); |
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of_phy_put(phy); |
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} |
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EXPORT_SYMBOL_GPL(phy_put); |
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|
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/** |
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* devm_phy_put() - release the PHY |
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* @dev: device that wants to release this phy |
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* @phy: the phy returned by devm_phy_get() |
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* |
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* destroys the devres associated with this phy and invokes phy_put |
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* 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, 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); |
|
|
|
/** |
|
* 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 the name of the controller |
|
* port for non-dt case |
|
* |
|
* Returns the phy driver, after getting a refcount to it; or |
|
* NULL if there is no such phy. The caller is responsible for |
|
* calling phy_put() to release that count. |
|
*/ |
|
struct phy *phy_optional_get(struct device *dev, const char *string) |
|
{ |
|
struct phy *phy = phy_get(dev, string); |
|
|
|
if (PTR_ERR(phy) == -ENODEV) |
|
phy = NULL; |
|
|
|
return phy; |
|
} |
|
EXPORT_SYMBOL_GPL(phy_optional_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_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_simple_get(&phy_ida, 0, 0, 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); |
|
} |
|
|
|
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, |
|
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, |
|
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)); |
|
regulator_put(phy->pwr); |
|
ida_simple_remove(&phy_ida, phy->id); |
|
kfree(phy); |
|
} |
|
|
|
static int __init phy_core_init(void) |
|
{ |
|
phy_class = class_create(THIS_MODULE, "phy"); |
|
if (IS_ERR(phy_class)) { |
|
pr_err("failed to create phy class --> %ld\n", |
|
PTR_ERR(phy_class)); |
|
return PTR_ERR(phy_class); |
|
} |
|
|
|
phy_class->dev_release = phy_release; |
|
|
|
return 0; |
|
} |
|
device_initcall(phy_core_init);
|
|
|