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"Das U-Boot" Source Tree
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 <errno.h>
8#include <image.h>
9#include <log.h>
10#include <linux/libfdt.h>
11
12ulong 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__weak int board_fit_config_name_match(const char *name)
25{
26 return -EINVAL;
27}
28
29/*
30 * Iterate over all /configurations subnodes and call a platform specific
31 * function to find the matching configuration.
32 * Returns the node offset or a negative error number.
33 */
34int fit_find_config_node(const void *fdt)
35{
36 const char *name;
37 int conf, node, len;
38 const char *dflt_conf_name;
39 const char *dflt_conf_desc = NULL;
40 int dflt_conf_node = -ENOENT;
41
42 conf = fdt_path_offset(fdt, FIT_CONFS_PATH);
43 if (conf < 0) {
44 debug("%s: Cannot find /configurations node: %d\n", __func__,
45 conf);
46 return -EINVAL;
47 }
48
49 dflt_conf_name = fdt_getprop(fdt, conf, "default", &len);
50
51 for (node = fdt_first_subnode(fdt, conf);
52 node >= 0;
53 node = fdt_next_subnode(fdt, node)) {
54 name = fdt_getprop(fdt, node, "description", &len);
55 if (!name) {
56#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
57 printf("%s: Missing FDT description in DTB\n",
58 __func__);
59#endif
60 return -EINVAL;
61 }
62
63 if (dflt_conf_name) {
64 const char *node_name = fdt_get_name(fdt, node, NULL);
65 if (strcmp(dflt_conf_name, node_name) == 0) {
66 dflt_conf_node = node;
67 dflt_conf_desc = name;
68 }
69 }
70
71 if (board_fit_config_name_match(name))
72 continue;
73
74 debug("Selecting config '%s'\n", name);
75
76 return node;
77 }
78
79 if (dflt_conf_node != -ENOENT) {
80 debug("Selecting default config '%s'\n", dflt_conf_desc);
81 return dflt_conf_node;
82 }
83
84 return -ENOENT;
85}