linux/include/linux/of_platform.h
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   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#ifdef CONFIG_OF_DEVICE
  15#include <linux/device.h>
  16#include <linux/mod_devicetable.h>
  17#include <linux/pm.h>
  18#include <linux/of_device.h>
  19#include <linux/platform_device.h>
  20
  21/**
  22 * struct of_dev_auxdata - lookup table entry for device names & platform_data
  23 * @compatible: compatible value of node to match against node
  24 * @phys_addr: Start address of registers to match against node
  25 * @name: Name to assign for matching nodes
  26 * @platform_data: platform_data to assign for matching nodes
  27 *
  28 * This lookup table allows the caller of of_platform_populate() to override
  29 * the names of devices when creating devices from the device tree.  The table
  30 * should be terminated with an empty entry.  It also allows the platform_data
  31 * pointer to be set.
  32 *
  33 * The reason for this functionality is that some Linux infrastructure uses
  34 * the device name to look up a specific device, but the Linux-specific names
  35 * are not encoded into the device tree, so the kernel needs to provide specific
  36 * values.
  37 *
  38 * Note: Using an auxdata lookup table should be considered a last resort when
  39 * converting a platform to use the DT.  Normally the automatically generated
  40 * device name will not matter, and drivers should obtain data from the device
  41 * node instead of from an anonymouns platform_data pointer.
  42 */
  43struct of_dev_auxdata {
  44        char *compatible;
  45        resource_size_t phys_addr;
  46        char *name;
  47        void *platform_data;
  48};
  49
  50/* Macro to simplify populating a lookup table */
  51#define OF_DEV_AUXDATA(_compat,_phys,_name,_pdata) \
  52        { .compatible = _compat, .phys_addr = _phys, .name = _name, \
  53          .platform_data = _pdata }
  54
  55/**
  56 * of_platform_driver - Legacy of-aware driver for platform devices.
  57 *
  58 * An of_platform_driver driver is attached to a basic platform_device on
  59 * the ibm ebus (ibmebus_bus_type).
  60 */
  61struct of_platform_driver
  62{
  63        int     (*probe)(struct platform_device* dev,
  64                         const struct of_device_id *match);
  65        int     (*remove)(struct platform_device* dev);
  66
  67        int     (*suspend)(struct platform_device* dev, pm_message_t state);
  68        int     (*resume)(struct platform_device* dev);
  69        int     (*shutdown)(struct platform_device* dev);
  70
  71        struct device_driver    driver;
  72};
  73#define to_of_platform_driver(drv) \
  74        container_of(drv,struct of_platform_driver, driver)
  75
  76extern const struct of_device_id of_default_bus_match_table[];
  77
  78/* Platform drivers register/unregister */
  79extern struct platform_device *of_device_alloc(struct device_node *np,
  80                                         const char *bus_id,
  81                                         struct device *parent);
  82extern struct platform_device *of_find_device_by_node(struct device_node *np);
  83
  84#ifdef CONFIG_OF_ADDRESS /* device reg helpers depend on OF_ADDRESS */
  85/* Platform devices and busses creation */
  86extern struct platform_device *of_platform_device_create(struct device_node *np,
  87                                                   const char *bus_id,
  88                                                   struct device *parent);
  89
  90extern int of_platform_bus_probe(struct device_node *root,
  91                                 const struct of_device_id *matches,
  92                                 struct device *parent);
  93extern int of_platform_populate(struct device_node *root,
  94                                const struct of_device_id *matches,
  95                                const struct of_dev_auxdata *lookup,
  96                                struct device *parent);
  97#endif /* CONFIG_OF_ADDRESS */
  98
  99#endif /* CONFIG_OF_DEVICE */
 100
 101#if !defined(CONFIG_OF_ADDRESS)
 102struct of_dev_auxdata;
 103static inline int of_platform_populate(struct device_node *root,
 104                                        const struct of_device_id *matches,
 105                                        const struct of_dev_auxdata *lookup,
 106                                        struct device *parent)
 107{
 108        return -ENODEV;
 109}
 110#endif /* !CONFIG_OF_ADDRESS */
 111
 112#endif  /* _LINUX_OF_PLATFORM_H */
 113
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