include/dm/root.h

   1 /*
   2  * Copyright (c) 2013 Google, Inc
   3  *
   4  * (C) Copyright 2012
   5  * Pavel Herrmann <morpheus.ibis@gmail.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #ifndef _DM_ROOT_H_
  11 #define _DM_ROOT_H_
  12
  13 struct udevice;
  14
  15 /**
  16  * dm_root() - Return pointer to the top of the driver tree
  17  *
  18  * This function returns pointer to the root node of the driver tree,
  19  *
  20  * @return pointer to root device, or NULL if not inited yet
  21  */
  22 struct udevice *dm_root(void);
  23
  24 struct global_data;
  25 /**
  26  * dm_fixup_for_gd_move() - Handle global_data moving to a new place
  27  *
  28  * The uclass list is part of global_data. Due to the way lists work, moving
  29  * the list will cause it to become invalid. This function fixes that up so
  30  * that the uclass list will work correctly.
  31  */
  32 void dm_fixup_for_gd_move(struct global_data *new_gd);
  33
  34 /**
  35  * dm_scan_platdata() - Scan all platform data and bind drivers
  36  *
  37  * This scans all available platdata and creates drivers for each
  38  *
  39  * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
  40  * flag. If false bind all drivers.
  41  * @return 0 if OK, -ve on error
  42  */
  43 int dm_scan_platdata(bool pre_reloc_only);
  44
  45 /**
  46  * dm_scan_fdt() - Scan the device tree and bind drivers
  47  *
  48  * This scans the device tree and creates a driver for each node. Only
  49  * the top-level subnodes are examined.
  50  *
  51  * @blob: Pointer to device tree blob
  52  * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
  53  * flag. If false bind all drivers.
  54  * @return 0 if OK, -ve on error
  55  */
  56 int dm_scan_fdt(const void *blob, bool pre_reloc_only);
  57
  58 /**
  59  * dm_scan_other() - Scan for other devices
  60  *
  61  * Some devices may not be visible to Driver Model. This weak function can
  62  * be provided by boards which wish to create their own devices
  63  * programmaticaly. They should do this by calling device_bind() on each
  64  * device.
  65  *
  66  * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
  67  * flag. If false bind all drivers.
  68  */
  69 int dm_scan_other(bool pre_reloc_only);
  70
  71 /**
  72  * dm_init_and_scan() - Initialise Driver Model structures and scan for devices
  73  *
  74  * This function initialises the roots of the driver tree and uclass trees,
  75  * then scans and binds available devices from platform data and the FDT.
  76  * This calls dm_init() to set up Driver Model structures.
  77  *
  78  * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
  79  * flag. If false bind all drivers.
  80  * @return 0 if OK, -ve on error
  81  */
  82 int dm_init_and_scan(bool pre_reloc_only);
  83
  84 /**
  85  * dm_init() - Initialise Driver Model structures
  86  *
  87  * This function will initialize roots of driver tree and class tree.
  88  * This needs to be called before anything uses the DM
  89  *
  90  * @of_live:    Enable live device tree
  91  * @return 0 if OK, -ve on error
  92  */
  93 int dm_init(bool of_live);
  94
  95 /**
  96  * dm_uninit - Uninitialise Driver Model structures
  97  *
  98  * All devices will be removed and unbound
  99  * @return 0 if OK, -ve on error
 100  */
 101 int dm_uninit(void);
 102
 103 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
 104 /**
 105  * dm_remove_devices_flags - Call remove function of all drivers with
 106  *                           specific removal flags set to selectively
 107  *                           remove drivers
 108  *
 109  * All devices with the matching flags set will be removed
 110  *
 111  * @flags: Flags for selective device removal
 112  * @return 0 if OK, -ve on error
 113  */
 114 int dm_remove_devices_flags(uint flags);
 115 #else
 116 static inline int dm_remove_devices_flags(uint flags) { return 0; }
 117 #endif
 118
 119 #endif