dtoc: Make GetArgs() more flexible

At present it is not possible to have arguments which include spaces.
Update the function to only split the args if the property is a single
string. This is a bit inconsistent, but might still be useful.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Suggested-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

tools/dtoc/fdt_util.py

@@ -192,8 +192,12 @@ def GetArgs(node, propname):
         value = GetStringList(node, propname)
     else:
         value = []
-    lists = [v.split() for v in value]
-    args = [x for l in lists for x in l]
+    if not value:
+        args = []
+    elif len(value) == 1:
+        args = value[0].split()
+    else:
+        args = value
     return args
 
 def GetBool(node, propname, default=False):

tools/dtoc/test/dtoc_test_simple.dts

@@ -63,5 +63,7 @@
 	orig-node {
 		orig = <1 23 4>;
 		args = "-n first", "second", "-p", "123,456", "-x";
+		args2 = "a space", "there";
+		args3 = "-n first second -p 123,456 -x";
 	};
 };

tools/dtoc/test_fdt.py

@@ -659,8 +659,12 @@ class TestFdtUtil(unittest.TestCase):
             ['multi-word', 'message'],
             fdt_util.GetArgs(self.node, 'stringarray'))
         self.assertEqual([], fdt_util.GetArgs(self.node, 'boolval'))
-        self.assertEqual(['-n', 'first', 'second', '-p', '123,456', '-x'],
+        self.assertEqual(['-n first', 'second', '-p', '123,456', '-x'],
                          fdt_util.GetArgs(node, 'args'))
+        self.assertEqual(['a space', 'there'],
+                         fdt_util.GetArgs(node, 'args2'))
+        self.assertEqual(['-n', 'first', 'second', '-p', '123,456', '-x'],
+                         fdt_util.GetArgs(node, 'args3'))
         with self.assertRaises(ValueError) as exc:
             fdt_util.GetArgs(self.node, 'missing')
         self.assertIn(