1. 根目录:
2. include
3. linux
4. of_platform.h

#ifndef _LINUX_OF_PLATFORM_H
#define _LINUX_OF_PLATFORM_H
/*
 *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
 *			 <benh@kernel.crashing.org>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/pm.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>

/**
 * struct of_dev_auxdata - lookup table entry for device names & platform_data
 * @compatible: compatible value of node to match against node
 * @phys_addr: Start address of registers to match against node
 * @name: Name to assign for matching nodes
 * @platform_data: platform_data to assign for matching nodes
 *
 * This lookup table allows the caller of of_platform_populate() to override
 * the names of devices when creating devices from the device tree.  The table
 * should be terminated with an empty entry.  It also allows the platform_data
 * pointer to be set.
 *
 * The reason for this functionality is that some Linux infrastructure uses
 * the device name to look up a specific device, but the Linux-specific names
 * are not encoded into the device tree, so the kernel needs to provide specific
 * values.
 *
 * Note: Using an auxdata lookup table should be considered a last resort when
 * converting a platform to use the DT.  Normally the automatically generated
 * device name will not matter, and drivers should obtain data from the device
 * node instead of from an anonymous platform_data pointer.
 */
struct of_dev_auxdata {
	char *compatible;
	resource_size_t phys_addr;
	char *name;
	void *platform_data;
};

/* Macro to simplify populating a lookup table */
#define OF_DEV_AUXDATA(_compat,_phys,_name,_pdata) \
	{ .compatible = _compat, .phys_addr = _phys, .name = _name, \
	  .platform_data = _pdata }

extern const struct of_device_id of_default_bus_match_table[];

/* Platform drivers register/unregister */
extern struct platform_device *of_device_alloc(struct device_node *np,
					 const char *bus_id,
					 struct device *parent);
extern struct platform_device *of_find_device_by_node(struct device_node *np);

/* Platform devices and busses creation */
extern struct platform_device *of_platform_device_create(struct device_node *np,
						   const char *bus_id,
						   struct device *parent);

extern int of_platform_bus_probe(struct device_node *root,
				 const struct of_device_id *matches,
				 struct device *parent);
#ifdef CONFIG_OF_ADDRESS
extern int of_platform_populate(struct device_node *root,
				const struct of_device_id *matches,
				const struct of_dev_auxdata *lookup,
				struct device *parent);
extern void of_platform_depopulate(struct device *parent);
#else
static inline int of_platform_populate(struct device_node *root,
					const struct of_device_id *matches,
					const struct of_dev_auxdata *lookup,
					struct device *parent)
{
	return -ENODEV;
}
static inline void of_platform_depopulate(struct device *parent) { }
#endif

#endif	/* _LINUX_OF_PLATFORM_H */