libfdt: Add phandle related functions

This patch adds fdt_get_phandle() and fdt_node_offset_by_phandle()
functions to libfdt.  fdt_get_phandle() will retreive the phandle
value of a given node, and fdt_node_offset_by_phandle() will locate a
node given a phandle.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 58 insertions, 0 deletions

diff --git a/tests/get_phandle.c b/tests/get_phandle.c
new file mode 100644
index 0000000..f7650b8
--- /dev/null
+++ b/tests/get_phandle.c
@@ -0,0 +1,58 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ *	Testcase for fdt_get_phandle()
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "tests.h"
+#include "testdata.h"
+
+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);
+}
+
+int main(int argc, char *argv[])
+{
+	void *fdt;
+
+	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);
+
+	PASS();
+}