forked from Minki/linux
f9d4d453db
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* of.c The helpers for hcd device tree support
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*
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* Copyright (C) 2016 Freescale Semiconductor, Inc.
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* Author: Peter Chen <peter.chen@freescale.com>
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*/
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/usb/of.h>
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/**
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* usb_of_get_child_node - Find the device node match port number
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* @parent: the parent device node
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* @portnum: the port number which device is connecting
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*
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* Find the node from device tree according to its port number.
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*
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* Return: A pointer to the node with incremented refcount if found, or
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* %NULL otherwise.
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*/
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struct device_node *usb_of_get_child_node(struct device_node *parent,
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int portnum)
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{
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struct device_node *node;
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u32 port;
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for_each_child_of_node(parent, node) {
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if (!of_property_read_u32(node, "reg", &port)) {
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if (port == portnum)
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return node;
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(usb_of_get_child_node);
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/**
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* usb_of_get_companion_dev - Find the companion device
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* @dev: the device pointer to find a companion
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*
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* Find the companion device from platform bus.
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*
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* Takes a reference to the returned struct device which needs to be dropped
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* after use.
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*
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* Return: On success, a pointer to the companion device, %NULL on failure.
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*/
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struct device *usb_of_get_companion_dev(struct device *dev)
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{
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struct device_node *node;
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struct platform_device *pdev = NULL;
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node = of_parse_phandle(dev->of_node, "companion", 0);
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if (node)
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pdev = of_find_device_by_node(node);
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of_node_put(node);
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return pdev ? &pdev->dev : NULL;
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}
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EXPORT_SYMBOL_GPL(usb_of_get_companion_dev);
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