1 files changed, 87 insertions, 0 deletions
diff --git a/dtc/tests/get_phandle.c b/dtc/tests/get_phandle.c
new file mode 100644
index 000000000..157b522d0
--- /dev/null
+++ b/dtc/tests/get_phandle.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * libfdt - Flat Device Tree manipulation
+ *	Testcase for fdt_get_phandle()
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ */
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <libfdt.h>
+
+#include "tests.h"
+#include "testdata.h"
+
+static void check_phandle(void *fdt, const char *path, uint32_t checkhandle)
+{
+	int offset;
+	uint32_t phandle;
+
+	offset = fdt_path_offset(fdt, path);
+	if (offset < 0)
+		FAIL("Couldn't find %s", path);
+
+	phandle = fdt_get_phandle(fdt, offset);
+	if (phandle != checkhandle)
+		FAIL("fdt_get_phandle(%s) returned 0x%x instead of 0x%x\n",
+		     path, phandle, checkhandle);
+}
+
+static void check_phandle_unique(const void *fdt, uint32_t checkhandle)
+{
+	uint32_t phandle;
+	int offset = -1;
+
+	while (true) {
+		offset = fdt_next_node(fdt, offset, NULL);
+		if (offset < 0) {
+			if (offset == -FDT_ERR_NOTFOUND)
+				break;
+
+			FAIL("error looking for phandle %#x", checkhandle);
+		}
+
+		phandle = fdt_get_phandle(fdt, offset);
+
+		if (phandle == checkhandle)
+			FAIL("generated phandle already exists");
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	uint32_t max, phandle;
+	void *fdt;
+	int err;
+
+	test_init(argc, argv);
+	fdt = load_blob_arg(argc, argv);
+
+	check_phandle(fdt, "/", 0);
+	check_phandle(fdt, "/subnode@2", PHANDLE_1);
+	check_phandle(fdt, "/subnode@2/subsubnode@0", PHANDLE_2);
+
+	err = fdt_find_max_phandle(fdt, &max);
+	if (err < 0)
+		FAIL("fdt_find_max_phandle returned %d instead of 0\n", err);
+
+	if (max != PHANDLE_2)
+		FAIL("fdt_find_max_phandle found 0x%x instead of 0x%x", max,
+		     PHANDLE_2);
+
+	max = fdt_get_max_phandle(fdt);
+	if (max != PHANDLE_2)
+		FAIL("fdt_get_max_phandle returned 0x%x instead of 0x%x\n",
+		     max, PHANDLE_2);
+
+	err = fdt_generate_phandle(fdt, &phandle);
+	if (err < 0)
+		FAIL("failed to generate phandle: %d", err);
+
+	check_phandle_unique(fdt, phandle);
+
+	PASS();
+}