pylibfdt: Add support for fdt_get_alias()

Add this into the class to simplify use of this function.

Signed-off-by: Appana Durga Kedareswara rao <appana.durga.rao@xilinx.com>
Message-Id: <1562130487-27028-1-git-send-email-appana.durga.rao@xilinx.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

pylibfdt/libfdt.i

@@ -431,6 +431,18 @@ class FdtRo(object):
         """
         return fdt_get_phandle(self._fdt, nodeoffset)
 
+    def get_alias(self, name):
+        """Get the full path referenced by a given alias
+
+        Args:
+            name: name of the alias to lookup
+
+        Returns:
+            Full path to the node for the alias named 'name', if it exists
+            None, if the given alias or the /aliases node does not exist
+        """
+        return fdt_get_alias(self._fdt, name)
+
     def parent_offset(self, nodeoffset, quiet=()):
         """Get the offset of a node's parent
 

tests/pylibfdt_tests.py

@@ -77,6 +77,7 @@ class PyLibfdtBasicTests(unittest.TestCase):
         """Read in the device tree we use for testing"""
         self.fdt = _ReadFdt('test_tree1.dtb')
         self.fdt2 = _ReadFdt('test_props.dtb')
+        self.fdt3 = _ReadFdt('aliases.dtb')
 
     def GetPropList(self, node_path):
         """Read a list of properties from a node
@@ -340,6 +341,12 @@ class PyLibfdtBasicTests(unittest.TestCase):
         node2 = self.fdt.path_offset('/subnode@2')
         self.assertEquals(0x2000, self.fdt.get_phandle(node2))
 
+    def testGetAlias(self):
+        """Test for the get_alias() method"""
+        self.assertEquals("/subnode@1", self.fdt3.get_alias('s1'))
+        self.assertEquals("/subnode@1/subsubnode", self.fdt3.get_alias('ss1'))
+        self.assertEquals("/subnode@1/subsubnode/subsubsubnode", self.fdt3.get_alias('sss1'))
+
     def testParentOffset(self):
         """Test for the parent_offset() method"""
         self.assertEquals(-libfdt.NOTFOUND,