1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * Copyright (c) 2013 Google, Inc
4 *
5 * (C) Copyright 2012
6 * Pavel Herrmann <morpheus.ibis@gmail.com>
7 */
8
9 #ifndef _DM_ROOT_H_
10 #define _DM_ROOT_H_
11
12 struct udevice;
13
14 /**
15 * dm_root() - Return pointer to the top of the driver tree
16 *
17 * This function returns pointer to the root node of the driver tree,
18 *
19 * @return pointer to root device, or NULL if not inited yet
20 */
21 struct udevice *dm_root(void);
22
23 struct global_data;
24 /**
25 * dm_fixup_for_gd_move() - Handle global_data moving to a new place
26 *
27 * The uclass list is part of global_data. Due to the way lists work, moving
28 * the list will cause it to become invalid. This function fixes that up so
29 * that the uclass list will work correctly.
30 */
31 void dm_fixup_for_gd_move(struct global_data *new_gd);
32
33 /**
34 * dm_scan_platdata() - Scan all platform data and bind drivers
35 *
36 * This scans all available platdata and creates drivers for each
37 *
38 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
39 * flag. If false bind all drivers.
40 * @return 0 if OK, -ve on error
41 */
42 int dm_scan_platdata(bool pre_reloc_only);
43
44 /**
45 * dm_scan_fdt() - Scan the device tree and bind drivers
46 *
47 * This scans the device tree and creates a driver for each node. Only
48 * the top-level subnodes are examined.
49 *
50 * @blob: Pointer to device tree blob
51 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
52 * flag. If false bind all drivers.
53 * @return 0 if OK, -ve on error
54 */
55 int dm_scan_fdt(const void *blob, bool pre_reloc_only);
56
57 /**
58 * dm_extended_scan_fdt() - Scan the device tree and bind drivers
59 *
60 * This calls dm_scna_dft() which scans the device tree and creates a driver
61 * for each node. the top-level subnodes are examined and also all sub-nodes
62 * of "clocks" node.
63 *
64 * @blob: Pointer to device tree blob
65 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
66 * flag. If false bind all drivers.
67 * @return 0 if OK, -ve on error
68 */
69 int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only);
70
71 /**
72 * dm_scan_other() - Scan for other devices
73 *
74 * Some devices may not be visible to Driver Model. This weak function can
75 * be provided by boards which wish to create their own devices
76 * programmaticaly. They should do this by calling device_bind() on each
77 * device.
78 *
79 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
80 * flag. If false bind all drivers.
81 */
82 int dm_scan_other(bool pre_reloc_only);
83
84 /**
85 * dm_init_and_scan() - Initialise Driver Model structures and scan for devices
86 *
87 * This function initialises the roots of the driver tree and uclass trees,
88 * then scans and binds available devices from platform data and the FDT.
89 * This calls dm_init() to set up Driver Model structures.
90 *
91 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
92 * flag. If false bind all drivers.
93 * @return 0 if OK, -ve on error
94 */
95 int dm_init_and_scan(bool pre_reloc_only);
96
97 /**
98 * dm_init() - Initialise Driver Model structures
99 *
100 * This function will initialize roots of driver tree and class tree.
101 * This needs to be called before anything uses the DM
102 *
103 * @of_live: Enable live device tree
104 * @return 0 if OK, -ve on error
105 */
106 int dm_init(bool of_live);
107
108 /**
109 * dm_uninit - Uninitialise Driver Model structures
110 *
111 * All devices will be removed and unbound
112 * @return 0 if OK, -ve on error
113 */
114 int dm_uninit(void);
115
116 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
117 /**
118 * dm_remove_devices_flags - Call remove function of all drivers with
119 * specific removal flags set to selectively
120 * remove drivers
121 *
122 * All devices with the matching flags set will be removed
123 *
124 * @flags: Flags for selective device removal
125 * @return 0 if OK, -ve on error
126 */
127 int dm_remove_devices_flags(uint flags);
128 #else
dm_remove_devices_flags(uint flags)129 static inline int dm_remove_devices_flags(uint flags) { return 0; }
130 #endif
131
132 #endif
133