diff --git a/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml b/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
index 6a89b479d10f..05c121b0cb3d 100644
--- a/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
+++ b/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
@@ -90,6 +90,7 @@ properties:
           - enum:
               - mediatek,mt6323-regulator
               - mediatek,mt6328-regulator
+              - mediatek,mt6331-regulator
               - mediatek,mt6358-regulator
               - mediatek,mt6359-regulator
               - mediatek,mt6397-regulator