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69bec725 PC |
1 | /* |
2 | * of.c The helpers for hcd device tree support | |
3 | * | |
4 | * Copyright (C) 2016 Freescale Semiconductor, Inc. | |
5 | * Author: Peter Chen <peter.chen@freescale.com> | |
6 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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/>. | |
18 | */ | |
19 | ||
20 | #include <linux/of.h> | |
0573f2c5 | 21 | #include <linux/usb/of.h> |
69bec725 PC |
22 | |
23 | /** | |
24 | * usb_of_get_child_node - Find the device node match port number | |
25 | * @parent: the parent device node | |
26 | * @portnum: the port number which device is connecting | |
27 | * | |
28 | * Find the node from device tree according to its port number. | |
29 | * | |
30 | * Return: On success, a pointer to the device node, %NULL on failure. | |
31 | */ | |
32 | struct device_node *usb_of_get_child_node(struct device_node *parent, | |
33 | int portnum) | |
34 | { | |
35 | struct device_node *node; | |
36 | u32 port; | |
37 | ||
38 | for_each_child_of_node(parent, node) { | |
39 | if (!of_property_read_u32(node, "reg", &port)) { | |
40 | if (port == portnum) | |
41 | return node; | |
42 | } | |
43 | } | |
44 | ||
45 | return NULL; | |
46 | } | |
47 | EXPORT_SYMBOL_GPL(usb_of_get_child_node); | |
48 |