include/linux/of_platform.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 #ifndef _LINUX_OF_PLATFORM_H
   3 #define _LINUX_OF_PLATFORM_H
   4 /*
   5  *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
   6  *                       <benh@kernel.crashing.org>
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/mod_devicetable.h>
  11 #include <linux/pm.h>
  12 #include <linux/of_device.h>
  13 #include <linux/platform_device.h>
  14
  15 /**
  16  * struct of_dev_auxdata - lookup table entry for device names & platform_data
  17  * @compatible: compatible value of node to match against node
  18  * @phys_addr: Start address of registers to match against node
  19  * @name: Name to assign for matching nodes
  20  * @platform_data: platform_data to assign for matching nodes
  21  *
  22  * This lookup table allows the caller of of_platform_populate() to override
  23  * the names of devices when creating devices from the device tree.  The table
  24  * should be terminated with an empty entry.  It also allows the platform_data
  25  * pointer to be set.
  26  *
  27  * The reason for this functionality is that some Linux infrastructure uses
  28  * the device name to look up a specific device, but the Linux-specific names
  29  * are not encoded into the device tree, so the kernel needs to provide specific
  30  * values.
  31  *
  32  * Note: Using an auxdata lookup table should be considered a last resort when
  33  * converting a platform to use the DT.  Normally the automatically generated
  34  * device name will not matter, and drivers should obtain data from the device
  35  * node instead of from an anonymous platform_data pointer.
  36  */
  37 struct of_dev_auxdata {
  38         char *compatible;
  39         resource_size_t phys_addr;
  40         char *name;
  41         void *platform_data;
  42 };
  43
  44 /* Macro to simplify populating a lookup table */
  45 #define OF_DEV_AUXDATA(_compat,_phys,_name,_pdata) \
  46         { .compatible = _compat, .phys_addr = _phys, .name = _name, \
  47           .platform_data = _pdata }
  48
  49 extern const struct of_device_id of_default_bus_match_table[];
  50
  51 /* Platform drivers register/unregister */
  52 extern struct platform_device *of_device_alloc(struct device_node *np,
  53                                          const char *bus_id,
  54                                          struct device *parent);
  55 #ifdef CONFIG_OF
  56 extern struct platform_device *of_find_device_by_node(struct device_node *np);
  57 #else
  58 static inline struct platform_device *of_find_device_by_node(struct device_node *np)
  59 {
  60         return NULL;
  61 }
  62 #endif
  63
  64 /* Platform devices and busses creation */
  65 extern struct platform_device *of_platform_device_create(struct device_node *np,
  66                                                    const char *bus_id,
  67                                                    struct device *parent);
  68
  69 extern int of_platform_device_destroy(struct device *dev, void *data);
  70 extern int of_platform_bus_probe(struct device_node *root,
  71                                  const struct of_device_id *matches,
  72                                  struct device *parent);
  73 #ifdef CONFIG_OF_ADDRESS
  74 extern int of_platform_populate(struct device_node *root,
  75                                 const struct of_device_id *matches,
  76                                 const struct of_dev_auxdata *lookup,
  77                                 struct device *parent);
  78 extern int of_platform_default_populate(struct device_node *root,
  79                                         const struct of_dev_auxdata *lookup,
  80                                         struct device *parent);
  81 extern void of_platform_depopulate(struct device *parent);
  82
  83 extern int devm_of_platform_populate(struct device *dev);
  84
  85 extern void devm_of_platform_depopulate(struct device *dev);
  86 #else
  87 static inline int of_platform_populate(struct device_node *root,
  88                                         const struct of_device_id *matches,
  89                                         const struct of_dev_auxdata *lookup,
  90                                         struct device *parent)
  91 {
  92         return -ENODEV;
  93 }
  94 static inline int of_platform_default_populate(struct device_node *root,
  95                                                const struct of_dev_auxdata *lookup,
  96                                                struct device *parent)
  97 {
  98         return -ENODEV;
  99 }
 100 static inline void of_platform_depopulate(struct device *parent) { }
 101
 102 static inline int devm_of_platform_populate(struct device *dev)
 103 {
 104         return -ENODEV;
 105 }
 106
 107 static inline void devm_of_platform_depopulate(struct device *dev) { }
 108 #endif
 109
 110 #if defined(CONFIG_OF_DYNAMIC) && defined(CONFIG_OF_ADDRESS)
 111 extern void of_platform_register_reconfig_notifier(void);
 112 #else
 113 static inline void of_platform_register_reconfig_notifier(void) { }
 114 #endif
 115
 116 #endif  /* _LINUX_OF_PLATFORM_H */