diff --git a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml
index 41e0c56ef8e3..f776041fd08f 100644
--- a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml
@@ -47,6 +47,9 @@ properties:
       - const: saradc
       - const: apb_pclk
 
+  power-domains:
+    maxItems: 1
+
   resets:
     maxItems: 1