Merge branch 'master' of git://git.denx.de/u-boot
[oweals/u-boot.git] / common / common_fit.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2016 Google, Inc
4  * Written by Simon Glass <sjg@chromium.org>
5  */
6
7 #include <common.h>
8 #include <errno.h>
9 #include <image.h>
10 #include <linux/libfdt.h>
11
12 ulong fdt_getprop_u32(const void *fdt, int node, const char *prop)
13 {
14         const u32 *cell;
15         int len;
16
17         cell = fdt_getprop(fdt, node, prop, &len);
18         if (!cell || len != sizeof(*cell))
19                 return FDT_ERROR;
20
21         return fdt32_to_cpu(*cell);
22 }
23
24 /*
25  * Iterate over all /configurations subnodes and call a platform specific
26  * function to find the matching configuration.
27  * Returns the node offset or a negative error number.
28  */
29 int fit_find_config_node(const void *fdt)
30 {
31         const char *name;
32         int conf, node, len;
33         const char *dflt_conf_name;
34         const char *dflt_conf_desc = NULL;
35         int dflt_conf_node = -ENOENT;
36
37         conf = fdt_path_offset(fdt, FIT_CONFS_PATH);
38         if (conf < 0) {
39                 debug("%s: Cannot find /configurations node: %d\n", __func__,
40                       conf);
41                 return -EINVAL;
42         }
43
44         dflt_conf_name = fdt_getprop(fdt, conf, "default", &len);
45
46         for (node = fdt_first_subnode(fdt, conf);
47              node >= 0;
48              node = fdt_next_subnode(fdt, node)) {
49                 name = fdt_getprop(fdt, node, "description", &len);
50                 if (!name) {
51 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
52                         printf("%s: Missing FDT description in DTB\n",
53                                __func__);
54 #endif
55                         return -EINVAL;
56                 }
57
58                 if (dflt_conf_name) {
59                         const char *node_name = fdt_get_name(fdt, node, NULL);
60                         if (strcmp(dflt_conf_name, node_name) == 0) {
61                                 dflt_conf_node = node;
62                                 dflt_conf_desc = name;
63                         }
64                 }
65
66                 if (board_fit_config_name_match(name))
67                         continue;
68
69                 debug("Selecting config '%s'", name);
70
71                 return node;
72         }
73
74         if (dflt_conf_node != -ENOENT) {
75                 debug("Selecting default config '%s'\n", dflt_conf_desc);
76                 return dflt_conf_node;
77         }
78
79         return -ENOENT;
80 }