edtlib: test "last modified" semantic for included property specs

Make sure the property specs answered by the Binding.prop2specs API
do not all claim (PropertySpec.path) they were last modified
by the top-level binding.

Signed-off-by: Christophe Dufaza <chris@openmarl.org>

scripts/dts/python-devicetree/tests/test-bindings-include/base.yaml

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+properties:
+  x:
+    type: int
+  y:
+    type: int

scripts/dts/python-devicetree/tests/test-bindings-include/modified.yaml

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+include: base.yaml
+
+properties:
+  x:
+    required: true

scripts/dts/python-devicetree/tests/test-bindings-include/top.yaml

@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+description: |
+  Top-level binding file for testing included property spec paths.
+
+  base.yaml: specifies properties "x" and "y"
+  modified.yaml: includes base.yaml, modifies property "x"
+  top.yaml (this file): includes modified.yaml, specifies property "p"
+
+  From the top-level binding, we expect:
+  - "x" was last modified in modified.yaml
+  - "y" was last modified in base.yaml
+  - "p" was last modified in top.yaml
+
+compatible: top-level
+
+include: modified.yaml
+
+properties:
+  p:
+    type: int

scripts/dts/python-devicetree/tests/test_edtlib.py

@@ -365,6 +365,18 @@ def test_include_filters():
         assert set(child.prop2specs.keys()) == {'child-prop-1', 'child-prop-2',
                                                 'x', 'z'}  # root level 'y' is blocked
 
+def test_include_paths():
+    '''Test "last modified" semantic for included bindings paths.'''
+
+    fname2path = {'base.yaml': 'test-bindings-include/base.yaml',
+                  'modified.yaml': 'test-bindings-include/modified.yaml'}
+
+    with from_here():
+        top = edtlib.Binding('test-bindings-include/top.yaml', fname2path)
+
+        assert 'modified.yaml' == os.path.basename(top.prop2specs["x"].path)
+        assert 'base.yaml' == os.path.basename(top.prop2specs["y"].path)
+        assert 'top.yaml' == os.path.basename(top.prop2specs["p"].path)
 
 def test_bus():
     '''Test 'bus:' and 'on-bus:' in bindings'''