Peter Chen | 69bec72 | 2016-02-19 17:26:15 +0800 | [diff] [blame] | 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> |
Yoshihiro Shimoda | 5095cb8 | 2017-02-21 19:59:47 +0900 | [diff] [blame] | 21 | #include <linux/of_platform.h> |
Peter Chen | 0573f2c | 2016-06-15 11:25:43 +0800 | [diff] [blame] | 22 | #include <linux/usb/of.h> |
Peter Chen | 69bec72 | 2016-02-19 17:26:15 +0800 | [diff] [blame] | 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 | * |
| 31 | * Return: On success, a pointer to the device node, %NULL on failure. |
| 32 | */ |
| 33 | struct device_node *usb_of_get_child_node(struct device_node *parent, |
| 34 | int portnum) |
| 35 | { |
| 36 | struct device_node *node; |
| 37 | u32 port; |
| 38 | |
| 39 | for_each_child_of_node(parent, node) { |
| 40 | if (!of_property_read_u32(node, "reg", &port)) { |
| 41 | if (port == portnum) |
| 42 | return node; |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | return NULL; |
| 47 | } |
| 48 | EXPORT_SYMBOL_GPL(usb_of_get_child_node); |
| 49 | |
Yoshihiro Shimoda | 5095cb8 | 2017-02-21 19:59:47 +0900 | [diff] [blame] | 50 | /** |
| 51 | * usb_of_get_companion_dev - Find the companion device |
| 52 | * @dev: the device pointer to find a companion |
| 53 | * |
| 54 | * Find the companion device from platform bus. |
| 55 | * |
Johan Hovold | ef53b92 | 2017-05-16 16:26:14 +0200 | [diff] [blame] | 56 | * Takes a reference to the returned struct device which needs to be dropped |
| 57 | * after use. |
| 58 | * |
Yoshihiro Shimoda | 5095cb8 | 2017-02-21 19:59:47 +0900 | [diff] [blame] | 59 | * Return: On success, a pointer to the companion device, %NULL on failure. |
| 60 | */ |
| 61 | struct device *usb_of_get_companion_dev(struct device *dev) |
| 62 | { |
| 63 | struct device_node *node; |
| 64 | struct platform_device *pdev = NULL; |
| 65 | |
| 66 | node = of_parse_phandle(dev->of_node, "companion", 0); |
| 67 | if (node) |
| 68 | pdev = of_find_device_by_node(node); |
| 69 | |
| 70 | of_node_put(node); |
| 71 | |
| 72 | return pdev ? &pdev->dev : NULL; |
| 73 | } |
| 74 | EXPORT_SYMBOL_GPL(usb_of_get_companion_dev); |