diff --git a/tests/schema.json b/tests/schema.json
index fc6733aa4..fa81c2dfd 100644
--- a/tests/schema.json
+++ b/tests/schema.json
@@ -20,6 +20,13 @@
         "is_full_depth": {
             "type": "boolean"
         },
+        "subdevice_role": {
+            "type": "string",
+            "enum": [
+                "parent",
+                "child"
+            ]
+        },
         "console-ports": {
             "type": "array",
             "items": {