diff --git a/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml b/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
index 95e9566fc535..64d81e9aeb4b 100644
--- a/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
+++ b/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
@@ -71,6 +71,8 @@ properties:
                   - mediatek,mt6366-rtc
               - const: mediatek,mt6358-rtc
 
+      start-year: true
+
     required:
       - compatible