1 files changed, 77 insertions, 0 deletions
diff --git a/dtc/tests/subnode_iterate.c b/dtc/tests/subnode_iterate.c
new file mode 100644
index 000000000..2dc9b2d35
--- /dev/null
+++ b/dtc/tests/subnode_iterate.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * libfdt - Flat Device Tree manipulation
+ *	Tests that fdt_next_subnode() works as expected
+ *
+ * Copyright (C) 2013 Google, Inc
+ *
+ * Copyright (C) 2007 David Gibson, IBM Corporation.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <libfdt.h>
+
+#include "tests.h"
+#include "testdata.h"
+
+static void test_node(void *fdt, int parent_offset)
+{
+	uint32_t subnodes;
+	const fdt32_t *prop;
+	int offset;
+	int count;
+	int len;
+
+	/* This property indicates the number of subnodes to expect */
+	prop = fdt_getprop(fdt, parent_offset, "subnodes", &len);
+	if (!prop || len != sizeof(fdt32_t)) {
+		FAIL("Missing/invalid subnodes property at '%s'",
+		     fdt_get_name(fdt, parent_offset, NULL));
+	}
+	subnodes = fdt32_to_cpu(*prop);
+
+	count = 0;
+	fdt_for_each_subnode(offset, fdt, parent_offset)
+		count++;
+
+	if (count != subnodes) {
+		FAIL("Node '%s': Expected %d subnodes, got %d\n",
+		     fdt_get_name(fdt, parent_offset, NULL), subnodes,
+		     count);
+	}
+}
+
+static void check_fdt_next_subnode(void *fdt)
+{
+	int offset;
+	int count = 0;
+
+	fdt_for_each_subnode(offset, fdt, 0) {
+		test_node(fdt, offset);
+		count++;
+	}
+
+	if (count != 2)
+		FAIL("Expected %d tests, got %d\n", 2, count);
+}
+
+int main(int argc, char *argv[])
+{
+	void *fdt;
+
+	test_init(argc, argv);
+	if (argc != 2)
+		CONFIG("Usage: %s <dtb file>", argv[0]);
+
+	fdt = load_blob(argv[1]);
+	if (!fdt)
+		FAIL("No device tree available");
+
+	check_fdt_next_subnode(fdt);
+
+	PASS();
+}