include/dm/device-internal.h

   1 /*
   2  * Copyright (C) 2013 Google, Inc
   3  *
   4  * (C) Copyright 2012
   5  * Pavel Herrmann <morpheus.ibis@gmail.com>
   6  * Marek Vasut <marex@denx.de>
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #ifndef _DM_DEVICE_INTERNAL_H
  12 #define _DM_DEVICE_INTERNAL_H
  13
  14 struct udevice;
  15
  16 /**
  17  * device_bind() - Create a device and bind it to a driver
  18  *
  19  * Called to set up a new device attached to a driver. The device will either
  20  * have platdata, or a device tree node which can be used to create the
  21  * platdata.
  22  *
  23  * Once bound a device exists but is not yet active until device_probe() is
  24  * called.
  25  *
  26  * @parent: Pointer to device's parent, under which this driver will exist
  27  * @drv: Device's driver
  28  * @name: Name of device (e.g. device tree node name)
  29  * @platdata: Pointer to data for this device - the structure is device-
  30  * specific but may include the device's I/O address, etc.. This is NULL for
  31  * devices which use device tree.
  32  * @of_offset: Offset of device tree node for this device. This is -1 for
  33  * devices which don't use device tree.
  34  * @devp: Returns a pointer to the bound device
  35  * @return 0 if OK, -ve on error
  36  */
  37 int device_bind(struct udevice *parent, const struct driver *drv,
  38                 const char *name, void *platdata, int of_offset,
  39                 struct udevice **devp);
  40
  41 /**
  42  * device_bind_by_name: Create a device and bind it to a driver
  43  *
  44  * This is a helper function used to bind devices which do not use device
  45  * tree.
  46  *
  47  * @parent: Pointer to device's parent
  48  * @pre_reloc_only: If true, bind the driver only if its DM_INIT_F flag is set.
  49  * If false bind the driver always.
  50  * @info: Name and platdata for this device
  51  * @devp: Returns a pointer to the bound device
  52  * @return 0 if OK, -ve on error
  53  */
  54 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
  55                         const struct driver_info *info, struct udevice **devp);
  56
  57 /**
  58  * device_probe() - Probe a device, activating it
  59  *
  60  * Activate a device so that it is ready for use. All its parents are probed
  61  * first.
  62  *
  63  * @dev: Pointer to device to probe
  64  * @return 0 if OK, -ve on error
  65  */
  66 int device_probe(struct udevice *dev);
  67
  68 /**
  69  * device_probe() - Probe a child device, activating it
  70  *
  71  * Activate a device so that it is ready for use. All its parents are probed
  72  * first. The child is provided with parent data if parent_priv is not NULL.
  73  *
  74  * @dev: Pointer to device to probe
  75  * @parent_priv: Pointer to parent data. If non-NULL then this is provided to
  76  * the child.
  77  * @return 0 if OK, -ve on error
  78  */
  79 int device_probe_child(struct udevice *dev, void *parent_priv);
  80
  81 /**
  82  * device_remove() - Remove a device, de-activating it
  83  *
  84  * De-activate a device so that it is no longer ready for use. All its
  85  * children are deactivated first.
  86  *
  87  * @dev: Pointer to device to remove
  88  * @return 0 if OK, -ve on error (an error here is normally a very bad thing)
  89  */
  90 #ifdef CONFIG_DM_DEVICE_REMOVE
  91 int device_remove(struct udevice *dev);
  92 #else
  93 static inline int device_remove(struct udevice *dev) { return 0; }
  94 #endif
  95
  96 /**
  97  * device_unbind() - Unbind a device, destroying it
  98  *
  99  * Unbind a device and remove all memory used by it
 100  *
 101  * @dev: Pointer to device to unbind
 102  * @return 0 if OK, -ve on error
 103  */
 104 #ifdef CONFIG_DM_DEVICE_REMOVE
 105 int device_unbind(struct udevice *dev);
 106 #else
 107 static inline int device_unbind(struct udevice *dev) { return 0; }
 108 #endif
 109
 110 /**
 111  * device_remove_children() - Stop all device's children
 112  * @dev:        The device whose children are to be removed
 113  * @return 0 on success, -ve on error
 114  */
 115 #ifdef CONFIG_DM_DEVICE_REMOVE
 116 int device_remove_children(struct udevice *dev);
 117 #else
 118 static inline int device_remove_children(struct udevice *dev) { return 0; }
 119 #endif
 120
 121 /**
 122  * device_unbind_children() - Unbind all device's children from the device
 123  *
 124  * On error, the function continues to unbind all children, and reports the
 125  * first error.
 126  *
 127  * @dev:        The device that is to be stripped of its children
 128  * @return 0 on success, -ve on error
 129  */
 130 #ifdef CONFIG_DM_DEVICE_REMOVE
 131 int device_unbind_children(struct udevice *dev);
 132 #else
 133 static inline int device_unbind_children(struct udevice *dev) { return 0; }
 134 #endif
 135
 136 #ifdef CONFIG_DM_DEVICE_REMOVE
 137 void device_free(struct udevice *dev);
 138 #else
 139 static inline void device_free(struct udevice *dev) {}
 140 #endif
 141
 142 /* Cast away any volatile pointer */
 143 #define DM_ROOT_NON_CONST               (((gd_t *)gd)->dm_root)
 144 #define DM_UCLASS_ROOT_NON_CONST        (((gd_t *)gd)->uclass_root)
 145
 146 #endif