diff --git a/Bindings/pwm/mediatek,pwm-disp.yaml b/Bindings/pwm/mediatek,pwm-disp.yaml
index afcdeed..bc813fe 100644
--- a/Bindings/pwm/mediatek,pwm-disp.yaml
+++ b/Bindings/pwm/mediatek,pwm-disp.yaml
@@ -52,6 +52,9 @@
       - const: main
       - const: mm
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg