diff --git a/Documentation/devicetree/bindings/interrupt-controller/mediatek,mt6577-sysirq.yaml b/Documentation/devicetree/bindings/interrupt-controller/mediatek,mt6577-sysirq.yaml
index 30d76692ca87..b94fc3cec175 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/mediatek,mt6577-sysirq.yaml
+++ b/Documentation/devicetree/bindings/interrupt-controller/mediatek,mt6577-sysirq.yaml
@@ -49,7 +49,8 @@ properties:
   interrupt-controller: true
 
   "#interrupt-cells":
-    $ref: arm,gic.yaml#/properties/#interrupt-cells
+    const: 3
+    description: The cells have the same encoding as defined in arm,gic.yaml.
 
 required:
   - reg