diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
index 04cbbca0e94ee..b0e58b15b9ae7 100644
--- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
+++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
@@ -68,6 +68,7 @@ properties:
     maxItems: 1
 
   clocks:
+    minItems: 1
     items:
       - description: Controller clock used by normal mode
       - description: Reference clock used by low power mode etc
@@ -76,8 +77,9 @@ properties:
       - description: controller clock
 
   clock-names:
+    minItems: 1
     items:
-      - const: sys_ck
+      - const: sys_ck  # required, the following ones are optional
       - const: ref_ck
       - const: mcu_ck
       - const: dma_ck