1 // SPDX-License-Identifier: LGPL-2.1-or-later
2 /*
3 * libfdt - Flat Device Tree manipulation
4 * Tests that fdt_next_subnode() works as expected
5 *
6 * Copyright (C) 2013 Google, Inc
7 *
8 * Copyright (C) 2007 David Gibson, IBM Corporation.
9 */
10
11 #include <stdlib.h>
12 #include <stdio.h>
13 #include <string.h>
14 #include <stdint.h>
15
16 #include <libfdt.h>
17
18 #include "tests.h"
19 #include "testdata.h"
20
test_node(void * fdt,int parent_offset)21 static void test_node(void *fdt, int parent_offset)
22 {
23 uint32_t subnodes;
24 const fdt32_t *prop;
25 int offset;
26 unsigned int count;
27 int len;
28
29 /* This property indicates the number of subnodes to expect */
30 prop = fdt_getprop(fdt, parent_offset, "subnodes", &len);
31 if (!prop || len != sizeof(fdt32_t)) {
32 FAIL("Missing/invalid subnodes property at '%s'",
33 fdt_get_name(fdt, parent_offset, NULL));
34 }
35 subnodes = fdt32_to_cpu(*prop);
36
37 count = 0;
38 fdt_for_each_subnode(offset, fdt, parent_offset)
39 count++;
40
41 if (count != subnodes) {
42 FAIL("Node '%s': Expected %d subnodes, got %d\n",
43 fdt_get_name(fdt, parent_offset, NULL), subnodes,
44 count);
45 }
46 }
47
check_fdt_next_subnode(void * fdt)48 static void check_fdt_next_subnode(void *fdt)
49 {
50 int offset;
51 int count = 0;
52
53 fdt_for_each_subnode(offset, fdt, 0) {
54 test_node(fdt, offset);
55 count++;
56 }
57
58 if (count != 2)
59 FAIL("Expected %d tests, got %d\n", 2, count);
60 }
61
main(int argc,char * argv[])62 int main(int argc, char *argv[])
63 {
64 void *fdt;
65
66 test_init(argc, argv);
67 if (argc != 2)
68 CONFIG("Usage: %s <dtb file>", argv[0]);
69
70 fdt = load_blob(argv[1]);
71 if (!fdt)
72 FAIL("No device tree available");
73
74 check_fdt_next_subnode(fdt);
75
76 PASS();
77 }
78