dtoc: Add support for reading string-list properties

Add a function to read a list of strings from the devicetree.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/dtoc/fdt_util.py

@@ -163,6 +163,27 @@ def GetString(node, propname, default=None):
                          "a single string" % (node.name, propname))
     return value
 
+def GetStringList(node, propname, default=None):
+    """Get a string list from a property
+
+    Args:
+        node (Node): Node object to read from
+        propname (str): property name to read
+        default (list of str): Default value to use if the node/property do not
+            exist, or None
+
+    Returns:
+        String value read, or default if none
+    """
+    prop = node.props.get(propname)
+    if not prop:
+        return default
+    value = prop.value
+    if not isinstance(value, list):
+        strval = GetString(node, propname)
+        return [strval]
+    return value
+
 def GetBool(node, propname, default=False):
     """Get an boolean from a property
 

tools/dtoc/test_fdt.py

@@ -615,6 +615,15 @@ class TestFdtUtil(unittest.TestCase):
         self.assertIn("property 'stringarray' has list value: expecting a "
                       'single string', str(e.exception))
 
+    def testGetStringList(self):
+        self.assertEqual(['message'],
+                         fdt_util.GetStringList(self.node, 'stringval'))
+        self.assertEqual(
+            ['multi-word', 'message'],
+            fdt_util.GetStringList(self.node, 'stringarray'))
+        self.assertEqual(['test'],
+                         fdt_util.GetStringList(self.node, 'missing', ['test']))
+
     def testGetBool(self):
         self.assertEqual(True, fdt_util.GetBool(self.node, 'boolval'))
         self.assertEqual(False, fdt_util.GetBool(self.node, 'missing'))