2 * Copyright (c) 2013 Google, Inc
5 * Pavel Herrmann <morpheus.ibis@gmail.com>
7 * SPDX-License-Identifier: GPL-2.0+
10 #ifndef _DM_UCLASS_INTERNAL_H
11 #define _DM_UCLASS_INTERNAL_H
14 * uclass_get_device_tail() - handle the end of a get_device call
16 * This handles returning an error or probing a device as needed.
18 * @dev: Device that needs to be probed
19 * @ret: Error to return. If non-zero then the device is not probed
20 * @devp: Returns the value of 'dev' if there is no error
21 * @return ret, if non-zero, else the result of the device_probe() call
23 int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp);
26 * uclass_find_device() - Return n-th child of uclass
27 * @id: Id number of the uclass
28 * @index: Position of the child in uclass's list
29 * #devp: Returns pointer to device, or NULL on error
31 * The device is not prepared for use - this is an internal function.
32 * The function uclass_get_device_tail() can be used to probe the device.
34 * @return the uclass pointer of a child at the given index or
35 * return NULL on error.
37 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp);
40 * uclass_find_first_device() - Return the first device in a uclass
41 * @id: Id number of the uclass
42 * #devp: Returns pointer to device, or NULL on error
44 * The device is not prepared for use - this is an internal function.
45 * The function uclass_get_device_tail() can be used to probe the device.
47 * @return 0 if OK (found or not found), -1 on error
49 int uclass_find_first_device(enum uclass_id id, struct udevice **devp);
52 * uclass_find_next_device() - Return the next device in a uclass
53 * @devp: On entry, pointer to device to lookup. On exit, returns pointer
54 * to the next device in the same uclass, or NULL if none
56 * The device is not prepared for use - this is an internal function.
57 * The function uclass_get_device_tail() can be used to probe the device.
59 * @return 0 if OK (found or not found), -1 on error
61 int uclass_find_next_device(struct udevice **devp);
64 * uclass_find_device_by_name() - Find uclass device based on ID and name
66 * This searches for a device with the exactly given name.
68 * The device is NOT probed, it is merely returned.
71 * @name: name of a device to find
72 * @devp: Returns pointer to device (the first one with the name)
73 * @return 0 if OK, -ve on error
75 int uclass_find_device_by_name(enum uclass_id id, const char *name,
76 struct udevice **devp);
79 * uclass_find_device_by_seq() - Find uclass device based on ID and sequence
81 * This searches for a device with the given seq or req_seq.
83 * For seq, if an active device has this sequence it will be returned.
84 * If there is no such device then this will return -ENODEV.
86 * For req_seq, if a device (whether activated or not) has this req_seq
87 * value, that device will be returned. This is a strong indication that
88 * the device will receive that sequence when activated.
90 * The device is NOT probed, it is merely returned.
93 * @seq_or_req_seq: Sequence number to find (0=first)
94 * @find_req_seq: true to find req_seq, false to find seq
95 * @devp: Returns pointer to device (there is only one per for each seq)
96 * @return 0 if OK, -ve on error
98 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
99 bool find_req_seq, struct udevice **devp);
102 * uclass_find_device_by_of_offset() - Find a uclass device by device tree node
104 * This searches the devices in the uclass for one attached to the given
107 * The device is NOT probed, it is merely returned.
110 * @node: Device tree offset to search for (if -ve then -ENODEV is returned)
111 * @devp: Returns pointer to device (there is only one for each node)
112 * @return 0 if OK, -ve on error
114 int uclass_find_device_by_of_offset(enum uclass_id id, int node,
115 struct udevice **devp);
118 * uclass_bind_device() - Associate device with a uclass
120 * Connect the device into uclass's list of devices.
122 * @dev: Pointer to the device
123 * #return 0 on success, -ve on error
125 int uclass_bind_device(struct udevice *dev);
128 * uclass_unbind_device() - Deassociate device with a uclass
130 * Disconnect the device from uclass's list of devices.
132 * @dev: Pointer to the device
133 * #return 0 on success, -ve on error
135 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
136 int uclass_unbind_device(struct udevice *dev);
138 static inline int uclass_unbind_device(struct udevice *dev) { return 0; }
142 * uclass_pre_probe_device() - Deal with a device that is about to be probed
144 * Perform any pre-processing that is needed by the uclass before it can be
145 * probed. This includes the uclass' pre-probe() method and the parent
146 * uclass' child_pre_probe() method.
148 * @dev: Pointer to the device
149 * #return 0 on success, -ve on error
151 int uclass_pre_probe_device(struct udevice *dev);
154 * uclass_post_probe_device() - Deal with a device that has just been probed
156 * Perform any post-processing of a probed device that is needed by the
159 * @dev: Pointer to the device
160 * #return 0 on success, -ve on error
162 int uclass_post_probe_device(struct udevice *dev);
165 * uclass_pre_remove_device() - Handle a device which is about to be removed
167 * Perform any pre-processing of a device that is about to be removed.
169 * @dev: Pointer to the device
170 * #return 0 on success, -ve on error
172 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
173 int uclass_pre_remove_device(struct udevice *dev);
175 static inline int uclass_pre_remove_device(struct udevice *dev) { return 0; }
179 * uclass_find() - Find uclass by its id
181 * @id: Id to serach for
182 * @return pointer to uclass, or NULL if not found
184 struct uclass *uclass_find(enum uclass_id key);
187 * uclass_destroy() - Destroy a uclass
189 * Destroy a uclass and all its devices
191 * @uc: uclass to destroy
192 * @return 0 on success, -ve on error
194 int uclass_destroy(struct uclass *uc);