include/linux/of_platform.h

   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 anonymouns platform_data pointer.
  41  */
  42 struct 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
  54 extern const struct of_device_id of_default_bus_match_table[];
  55
  56 /* Platform drivers register/unregister */
  57 extern struct platform_device *of_device_alloc(struct device_node *np,
  58                                          const char *bus_id,
  59                                          struct device *parent);
  60 extern struct platform_device *of_find_device_by_node(struct device_node *np);
  61
  62 /* Platform devices and busses creation */
  63 extern struct platform_device *of_platform_device_create(struct device_node *np,
  64                                                    const char *bus_id,
  65                                                    struct device *parent);
  66
  67 extern 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
  71 extern 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);
  75 #else
  76 static inline int of_platform_populate(struct device_node *root,
  77                                         const struct of_device_id *matches,
  78                                         const struct of_dev_auxdata *lookup,
  79                                         struct device *parent)
  80 {
  81         return -ENODEV;
  82 }
  83 #endif
  84
  85 #endif  /* _LINUX_OF_PLATFORM_H */