2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 * and Arnd Bergmann, IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
15 #include <linux/string.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/mod_devicetable.h>
20 #include <linux/pci.h>
22 #include <linux/of_device.h>
23 #include <linux/of_platform.h>
25 #include <linux/errno.h>
26 #include <linux/topology.h>
27 #include <asm/atomic.h>
29 struct bus_type of_platform_bus_type = {
30 .uevent = of_device_uevent,
32 EXPORT_SYMBOL(of_platform_bus_type);
34 static int __init of_bus_driver_init(void)
36 return of_bus_type_init(&of_platform_bus_type, "of_platform");
38 postcore_initcall(of_bus_driver_init);
41 * The list of OF IDs below is used for matching bus types in the
42 * system whose devices are to be exposed as of_platform_devices.
44 * This is the default list valid for most platforms. This file provides
45 * functions who can take an explicit list if necessary though
47 * The search is always performed recursively looking for children of
48 * the provided device_node and recursively if such a children matches
49 * a bus type in the list
52 const struct of_device_id of_default_bus_ids[] = {
54 { .compatible = "soc", },
58 { .type = "simple", },
62 static int of_dev_node_match(struct device *dev, void *data)
64 return to_of_device(dev)->dev.of_node == data;
67 struct of_device *of_find_device_by_node(struct device_node *np)
71 dev = bus_find_device(&of_platform_bus_type,
72 NULL, np, of_dev_node_match);
74 return to_of_device(dev);
77 EXPORT_SYMBOL(of_find_device_by_node);
79 static int of_dev_phandle_match(struct device *dev, void *data)
82 return to_of_device(dev)->dev.of_node->phandle == *ph;
85 struct of_device *of_find_device_by_phandle(phandle ph)
89 dev = bus_find_device(&of_platform_bus_type,
90 NULL, &ph, of_dev_phandle_match);
92 return to_of_device(dev);
95 EXPORT_SYMBOL(of_find_device_by_phandle);