dtlib: fix 'phandle' property's filename and line number

The phandle property is auto-generated when parsing the DTS, so there is
no 'source information'. This commit sets the filename and line number
of the phandle property to be the same as the first reference to the
target node.

Signed-off-by: Luca Burelli <l.burelli@arduino.cc>

Author: pillo79

scripts/dts/python-devicetree/src/devicetree/dtlib.py

@@ -1415,7 +1415,7 @@ def _parse_value_labels(self, prop):
             prop._add_marker(_MarkerType.LABEL, tok.val)
             self._next_token()
 
-    def _node_phandle(self, node):
+    def _node_phandle(self, node, src_prop):
         # Returns the phandle for Node 'node', creating a new phandle if the
         # node has no phandle, and fixing up the value for existing
         # self-referential phandles (which get set to b'\0\0\0\0' initially).
@@ -1435,6 +1435,8 @@ def _node_phandle(self, node):
                 phandle_i += 1
             self.phandle2node[phandle_i] = node
 
+            phandle_prop.filename = src_prop.filename
+            phandle_prop.lineno = src_prop.lineno
             phandle_prop.value = phandle_i.to_bytes(4, "big")
             node.props["phandle"] = phandle_prop
 
@@ -1878,7 +1880,7 @@ def _fixup_props(self):
                         if marker_type is _MarkerType.PATH:
                             res += ref_node.path.encode("utf-8") + b'\0'
                         else:  # marker_type is PHANDLE
-                            res += self._node_phandle(ref_node)
+                            res += self._node_phandle(ref_node, prop)
                             # Skip over the dummy phandle placeholder
                             pos += 4