319 lines
7.3 KiB
C
319 lines
7.3 KiB
C
/*
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* phy-core.c -- Generic Phy framework.
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*
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* Copyright (C) 2014 Lucas Stach <l.stach@pengutronix.de>
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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 <kishon@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <common.h>
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#include <malloc.h>
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#include <linux/phy/phy.h>
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static LIST_HEAD(phy_provider_list);
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static int phy_ida;
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/**
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* phy_create() - create a new phy
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* @dev: device that is creating the new phy
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* @node: device node of the phy
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* @ops: function pointers for performing phy operations
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* @init_data: contains the list of PHY consumers or NULL
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*
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* Called to create a phy using phy framework.
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*/
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struct phy *phy_create(struct device_d *dev, struct device_node *node,
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const struct phy_ops *ops,
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struct phy_init_data *init_data)
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{
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int ret;
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int id;
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struct phy *phy;
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if (WARN_ON(!dev))
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return ERR_PTR(-EINVAL);
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phy = kzalloc(sizeof(*phy), GFP_KERNEL);
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if (!phy)
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return ERR_PTR(-ENOMEM);
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id = phy_ida++;
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snprintf(phy->dev.name, MAX_DRIVER_NAME, "phy");
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phy->dev.id = id;
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phy->dev.parent = dev;
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phy->dev.device_node = node ?: dev->device_node;
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phy->id = id;
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phy->ops = ops;
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phy->init_data = init_data;
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ret = register_device(&phy->dev);
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if (ret)
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goto free_ida;
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return phy;
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free_ida:
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phy_ida--;
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kfree(phy);
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return ERR_PTR(ret);
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}
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/**
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* __of_phy_provider_register() - create/register phy provider with the framework
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* @dev: struct device of the phy provider
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* @owner: the module owner containing of_xlate
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* @of_xlate: function pointer to obtain phy instance from phy provider
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*
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* Creates struct phy_provider from dev and of_xlate function pointer.
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* This is used in the case of dt boot for finding the phy instance from
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* phy provider.
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*/
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struct phy_provider *__of_phy_provider_register(struct device_d *dev,
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struct phy * (*of_xlate)(struct device_d *dev,
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struct of_phandle_args *args))
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{
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struct phy_provider *phy_provider;
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phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
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if (!phy_provider)
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return ERR_PTR(-ENOMEM);
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phy_provider->dev = dev;
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phy_provider->of_xlate = of_xlate;
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list_add_tail(&phy_provider->list, &phy_provider_list);
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return phy_provider;
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}
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/**
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* of_phy_provider_unregister() - unregister phy provider from the framework
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* @phy_provider: phy provider returned by of_phy_provider_register()
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*
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* Removes the phy_provider created using of_phy_provider_register().
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*/
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void of_phy_provider_unregister(struct phy_provider *phy_provider)
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{
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if (IS_ERR(phy_provider))
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return;
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list_del(&phy_provider->list);
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kfree(phy_provider);
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}
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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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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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return ret;
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}
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}
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++phy->init_count;
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return 0;
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}
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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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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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return ret;
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}
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}
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--phy->init_count;
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return 0;
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}
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int phy_power_on(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 (phy->pwr) {
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ret = regulator_enable(phy->pwr);
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if (ret)
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return ret;
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}
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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 out;
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}
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} else {
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ret = 0; /* Override possible ret == -ENOTSUPP */
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}
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++phy->power_count;
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return 0;
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out:
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if (phy->pwr)
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regulator_disable(phy->pwr);
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return ret;
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}
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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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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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return ret;
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}
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}
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--phy->power_count;
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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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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->device_node == node)
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return phy_provider;
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for_each_child_of_node(phy_provider->dev->device_node, 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(-ENODEV);
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}
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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 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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phy_provider = of_phy_provider_lookup(args.np);
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if (IS_ERR(phy_provider)) {
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return ERR_PTR(-ENODEV);
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}
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return phy_provider->of_xlate(phy_provider->dev, &args);
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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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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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return _of_phy_get(np, index);
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}
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/**
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* phy_get() - lookup and obtain a reference to a phy.
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* @dev: device that requests this phy
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* @string: the phy name as given in the dt data or the name of the controller
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* port for non-dt case
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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 *phy_get(struct device_d *dev, const char *string)
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{
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int index = 0;
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struct phy *phy = ERR_PTR(-ENODEV);
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if (string == NULL) {
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dev_warn(dev, "missing string\n");
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return ERR_PTR(-EINVAL);
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}
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if (dev->device_node) {
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index = of_property_match_string(dev->device_node, "phy-names",
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string);
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phy = _of_phy_get(dev->device_node, index);
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}
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return phy;
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}
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/**
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* phy_optional_get() - lookup and obtain a reference to an optional phy.
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* @dev: device that requests this phy
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* @string: the phy name as given in the dt data or the name of the controller
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* port for non-dt case
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*
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* Returns the phy driver, after getting a refcount to it; or
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* NULL 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 *phy_optional_get(struct device_d *dev, const char *string)
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{
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struct phy *phy = phy_get(dev, string);
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if (PTR_ERR(phy) == -ENODEV)
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phy = NULL;
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return phy;
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}
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