projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> | |
| 5095cb89 | 21 | #include <linux/of_platform.h> |
| 0573f2c5 | 22 | #include <linux/usb/of.h> |
| 69bec725 PC |
23 | |
| 24 | /** | |
| 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 | |
| 28 | * | |
| 29 | * Find the node from device tree according to its port number. | |
| 30 | * | |
| 60a93cff JH |
31 | * Return: A pointer to the node with incremented refcount if found, or |
| 32 | * %NULL otherwise. | |
| 69bec725 PC |
33 | */ |
| 34 | struct device_node *usb_of_get_child_node(struct device_node *parent, | |
| 35 | int portnum) | |
| 36 | { | |
| 37 | struct device_node *node; | |
| 38 | u32 port; | |
| 39 | ||
| 40 | for_each_child_of_node(parent, node) { | |
| 41 | if (!of_property_read_u32(node, "reg", &port)) { | |
| 42 | if (port == portnum) | |
| 43 | return node; | |
| 44 | } | |
| 45 | } | |
| 46 | ||
| 47 | return NULL; | |
| 48 | } | |
| 49 | EXPORT_SYMBOL_GPL(usb_of_get_child_node); | |
| 50 | ||
| 5095cb89 YS |
51 | /** |
| 52 | * usb_of_get_companion_dev - Find the companion device | |
| 53 | * @dev: the device pointer to find a companion | |
| 54 | * | |
| 55 | * Find the companion device from platform bus. | |
| 56 | * | |
| ef53b92e JH |
57 | * Takes a reference to the returned struct device which needs to be dropped |
| 58 | * after use. | |
| 59 | * | |
| 5095cb89 YS |
60 | * Return: On success, a pointer to the companion device, %NULL on failure. |
| 61 | */ | |
| 62 | struct device *usb_of_get_companion_dev(struct device *dev) | |
| 63 | { | |
| 64 | struct device_node *node; | |
| 65 | struct platform_device *pdev = NULL; | |
| 66 | ||
| 67 | node = of_parse_phandle(dev->of_node, "companion", 0); | |
| 68 | if (node) | |
| 69 | pdev = of_find_device_by_node(node); | |
| 70 | ||
| 71 | of_node_put(node); | |
| 72 | ||
| 73 | return pdev ? &pdev->dev : NULL; | |
| 74 | } | |
| 75 | EXPORT_SYMBOL_GPL(usb_of_get_companion_dev); |