LXR linux/include/linux/of

   1#ifndef _LINUX_OF_PLATFORM_H
   2#define _LINUX_OF_PLATFORM_H
   3/*
   4 *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
   5 *                       <benh@kernel.crashing.org>
   6 *
   7 *  This program is free software; you can redistribute it and/or
   8 *  modify it under the terms of the GNU General Public License
   9 *  as published by the Free Software Foundation; either version
  10 *  2 of the License, or (at your option) any later version.
  11 *
  12 */
  13
  14#include <linux/device.h>
  15#include <linux/mod_devicetable.h>
  16#include <linux/pm.h>
  17#include <linux/of_device.h>
  18#include <linux/platform_device.h>
  19
  20/**
  21 * struct of_dev_auxdata - lookup table entry for device names & platform_data
  22 * @compatible: compatible value of node to match against node
  23 * @phys_addr: Start address of registers to match against node
  24 * @name: Name to assign for matching nodes
  25 * @platform_data: platform_data to assign for matching nodes
  26 *
  27 * This lookup table allows the caller of of_platform_populate() to override
  28 * the names of devices when creating devices from the device tree.  The table
  29 * should be terminated with an empty entry.  It also allows the platform_data
  30 * pointer to be set.
  31 *
  32 * The reason for this functionality is that some Linux infrastructure uses
  33 * the device name to look up a specific device, but the Linux-specific names
  34 * are not encoded into the device tree, so the kernel needs to provide specific
  35 * values.
  36 *
  37 * Note: Using an auxdata lookup table should be considered a last resort when
  38 * converting a platform to use the DT.  Normally the automatically generated
  39 * device name will not matter, and drivers should obtain data from the device
  40 * node instead of from an anonymous platform_data pointer.
  41 */
  42struct of_dev_auxdata {
  43        char *compatible;
  44        resource_size_t phys_addr;
  45        char *name;
  46        void *platform_data;
  47};
  48
  49/* Macro to simplify populating a lookup table */
  50#define OF_DEV_AUXDATA(_compat,_phys,_name,_pdata) \
  51        { .compatible = _compat, .phys_addr = _phys, .name = _name, \
  52          .platform_data = _pdata }
  53
  54extern const struct of_device_id of_default_bus_match_table[];
  55
  56/* Platform drivers register/unregister */
  57extern struct platform_device *of_device_alloc(struct device_node *np,
  58                                         const char *bus_id,
  59                                         struct device *parent);
  60extern struct platform_device *of_find_device_by_node(struct device_node *np);
  61
  62/* Platform devices and busses creation */
  63extern struct platform_device *of_platform_device_create(struct device_node *np,
  64                                                   const char *bus_id,
  65                                                   struct device *parent);
  66
  67extern int of_platform_bus_probe(struct device_node *root,
  68                                 const struct of_device_id *matches,
  69                                 struct device *parent);
  70#ifdef CONFIG_OF_ADDRESS
  71extern int of_platform_populate(struct device_node *root,
  72                                const struct of_device_id *matches,
  73                                const struct of_dev_auxdata *lookup,
  74                                struct device *parent);
  75extern int of_platform_default_populate(struct device_node *root,
  76                                        const struct of_dev_auxdata *lookup,
  77                                        struct device *parent);
  78extern void of_platform_depopulate(struct device *parent);
  79#else
  80static inline int of_platform_populate(struct device_node *root,
  81                                        const struct of_device_id *matches,
  82                                        const struct of_dev_auxdata *lookup,
  83                                        struct device *parent)
  84{
  85        return -ENODEV;
  86}
  87static inline int of_platform_default_populate(struct device_node *root,
  88                                               const struct of_dev_auxdata *lookup,
  89                                               struct device *parent)
  90{
  91        return -ENODEV;
  92}
  93static inline void of_platform_depopulate(struct device *parent) { }
  94#endif
  95
  96#if defined(CONFIG_OF_DYNAMIC) && defined(CONFIG_OF_ADDRESS)
  97extern void of_platform_register_reconfig_notifier(void);
  98#else
  99static inline void of_platform_register_reconfig_notifier(void) { }
 100#endif
 101
 102#endif  /* _LINUX_OF_PLATFORM_H */
 103