2 * Copyright (c) 2013 Google, Inc
5 * Pavel Herrmann <morpheus.ibis@gmail.com>
6 * Marek Vasut <marex@denx.de>
8 * SPDX-License-Identifier: GPL-2.0+
14 #include <dm/uclass-id.h>
15 #include <linker_lists.h>
16 #include <linux/list.h>
20 /* Driver is active (probed). Cleared when it is removed */
21 #define DM_FLAG_ACTIVATED (1 << 0)
23 /* DM is responsible for allocating and freeing platdata */
24 #define DM_FLAG_ALLOC_PDATA (1 << 1)
26 /* DM should init this device prior to relocation */
27 #define DM_FLAG_PRE_RELOC (1 << 2)
30 * struct udevice - An instance of a driver
32 * This holds information about a device, which is a driver bound to a
33 * particular port or peripheral (essentially a driver instance).
35 * A device will come into existence through a 'bind' call, either due to
36 * a U_BOOT_DEVICE() macro (in which case platdata is non-NULL) or a node
37 * in the device tree (in which case of_offset is >= 0). In the latter case
38 * we translate the device tree information into platdata in a function
39 * implemented by the driver ofdata_to_platdata method (called just before the
40 * probe method if the device has a device tree node.
42 * All three of platdata, priv and uclass_priv can be allocated by the
43 * driver, or you can use the auto_alloc_size members of struct driver and
44 * struct uclass_driver to have driver model do this automatically.
46 * @driver: The driver used by this device
47 * @name: Name of device, typically the FDT node name
48 * @platdata: Configuration data for this device
49 * @of_offset: Device tree node offset for this device (- for none)
50 * @parent: Parent of this device, or NULL for the top level device
51 * @priv: Private data for this device
52 * @uclass: Pointer to uclass for this device
53 * @uclass_priv: The uclass's private data for this device
54 * @uclass_node: Used by uclass to link its devices
55 * @child_head: List of children of this device
56 * @sibling_node: Next device in list of all devices
57 * @flags: Flags for this device DM_FLAG_...
60 struct driver *driver;
64 struct udevice *parent;
66 struct uclass *uclass;
68 struct list_head uclass_node;
69 struct list_head child_head;
70 struct list_head sibling_node;
74 /* Returns the operations for a device */
75 #define device_get_ops(dev) (dev->driver->ops)
77 /* Returns non-zero if the device is active (probed and not removed) */
78 #define device_active(dev) ((dev)->flags & DM_FLAG_ACTIVATED)
81 * struct udevice_id - Lists the compatible strings supported by a driver
82 * @compatible: Compatible string
83 * @data: Data for this compatible string
86 const char *compatible;
91 * struct driver - A driver for a feature or peripheral
93 * This holds methods for setting up a new device, and also removing it.
94 * The device needs information to set itself up - this is provided either
95 * by platdata or a device tree node (which we find by looking up
96 * matching compatible strings with of_match).
98 * Drivers all belong to a uclass, representing a class of devices of the
99 * same type. Common elements of the drivers can be implemented in the uclass,
100 * or the uclass can provide a consistent interface to the drivers within
104 * @id: Identiies the uclass we belong to
105 * @of_match: List of compatible strings to match, and any identifying data
107 * @bind: Called to bind a device to its driver
108 * @probe: Called to probe a device, i.e. activate it
109 * @remove: Called to remove a device, i.e. de-activate it
110 * @unbind: Called to unbind a device from its driver
111 * @ofdata_to_platdata: Called before probe to decode device tree data
112 * @priv_auto_alloc_size: If non-zero this is the size of the private data
113 * to be allocated in the device's ->priv pointer. If zero, then the driver
114 * is responsible for allocating any data required.
115 * @platdata_auto_alloc_size: If non-zero this is the size of the
116 * platform data to be allocated in the device's ->platdata pointer.
117 * This is typically only useful for device-tree-aware drivers (those with
118 * an of_match), since drivers which use platdata will have the data
119 * provided in the U_BOOT_DEVICE() instantiation.
120 * ops: Driver-specific operations. This is typically a list of function
121 * pointers defined by the driver, to implement driver functions required by
123 * @flags: driver flags - see DM_FLAGS_...
128 const struct udevice_id *of_match;
129 int (*bind)(struct udevice *dev);
130 int (*probe)(struct udevice *dev);
131 int (*remove)(struct udevice *dev);
132 int (*unbind)(struct udevice *dev);
133 int (*ofdata_to_platdata)(struct udevice *dev);
134 int priv_auto_alloc_size;
135 int platdata_auto_alloc_size;
136 const void *ops; /* driver-specific operations */
140 /* Declare a new U-Boot driver */
141 #define U_BOOT_DRIVER(__name) \
142 ll_entry_declare(struct driver, __name, driver)
145 * dev_get_platdata() - Get the platform data for a device
147 * This checks that dev is not NULL, but no other checks for now
149 * @dev Device to check
150 * @return platform data, or NULL if none
152 void *dev_get_platdata(struct udevice *dev);
155 * dev_get_priv() - Get the private data for a device
157 * This checks that dev is not NULL, but no other checks for now
159 * @dev Device to check
160 * @return private data, or NULL if none
162 void *dev_get_priv(struct udevice *dev);