49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/*
|
|
* of.c The helpers for hcd device tree support
|
|
*
|
|
* Copyright (C) 2016 Freescale Semiconductor, Inc.
|
|
* Author: Peter Chen <peter.chen@freescale.com>
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 of
|
|
* the License as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/of.h>
|
|
#include <linux/usb/of.h>
|
|
|
|
/**
|
|
* usb_of_get_child_node - Find the device node match port number
|
|
* @parent: the parent device node
|
|
* @portnum: the port number which device is connecting
|
|
*
|
|
* Find the node from device tree according to its port number.
|
|
*
|
|
* Return: On success, a pointer to the device node, %NULL on failure.
|
|
*/
|
|
struct device_node *usb_of_get_child_node(struct device_node *parent,
|
|
int portnum)
|
|
{
|
|
struct device_node *node;
|
|
u32 port;
|
|
|
|
for_each_child_of_node(parent, node) {
|
|
if (!of_property_read_u32(node, "reg", &port)) {
|
|
if (port == portnum)
|
|
return node;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_of_get_child_node);
|
|
|