2 * of.c The helpers for hcd device tree support
4 * Copyright (C) 2016 Freescale Semiconductor, Inc.
5 * Author: Peter Chen <peter.chen@freescale.com>
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 of
9 * the License as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include <linux/of_platform.h>
22 #include <linux/usb/of.h>
25 * usb_of_get_child_node - Find the device node match port number
26 * @parent: the parent device node
27 * @portnum: the port number which device is connecting
29 * Find the node from device tree according to its port number.
31 * Return: A pointer to the node with incremented refcount if found, or
34 struct device_node *usb_of_get_child_node(struct device_node *parent,
37 struct device_node *node;
40 for_each_child_of_node(parent, node) {
41 if (!of_property_read_u32(node, "reg", &port)) {
49 EXPORT_SYMBOL_GPL(usb_of_get_child_node);
52 * usb_of_get_companion_dev - Find the companion device
53 * @dev: the device pointer to find a companion
55 * Find the companion device from platform bus.
57 * Takes a reference to the returned struct device which needs to be dropped
60 * Return: On success, a pointer to the companion device, %NULL on failure.
62 struct device *usb_of_get_companion_dev(struct device *dev)
64 struct device_node *node;
65 struct platform_device *pdev = NULL;
67 node = of_parse_phandle(dev->of_node, "companion", 0);
69 pdev = of_find_device_by_node(node);
73 return pdev ? &pdev->dev : NULL;
75 EXPORT_SYMBOL_GPL(usb_of_get_companion_dev);