Make Property a subclass of bytearray

It is annoying to have to add .value when we want the value of a Property.
Make Property a subclass of bytearray so that it can be used directly when
the value is required.

Fix the Property class comment while we are here.

Suggested-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

pylibfdt/libfdt.i

@@ -418,7 +418,8 @@ class Fdt:
         """
         return check_err(fdt_node_offset_by_phandle(self._fdt, phandle), quiet)
 
-class Property:
+
+class Property(bytearray):
     """Holds a device tree property name and value.
 
     This holds a copy of a property taken from the device tree. It does not
@@ -427,11 +428,11 @@ class Property:
 
     Properties:
         name: Property name
-        value: Proper value as a bytearray
+        value: Property value as a bytearray
     """
     def __init__(self, name, value):
+        bytearray.__init__(self, value)
         self.name = name
-        self.value = value
 %}
 
 %rename(fdt_property) fdt_property_func;

tests/pylibfdt_tests.py

@@ -190,7 +190,7 @@ class PyLibfdtTests(unittest.TestCase):
         poffset = self.fdt.first_property_offset(root)
         prop = self.fdt.get_property_by_offset(poffset)
         self.assertEquals(prop.name, 'compatible')
-        self.assertEquals(prop.value, 'test_tree1\0')
+        self.assertEquals(prop, 'test_tree1\0')
 
         with self.assertRaises(FdtException) as e:
             self.fdt.get_property_by_offset(-2)