diff --git a/Documentation/devicetree/bindings/pci/cix,sky1-pcie-host.yaml b/Documentation/devicetree/bindings/pci/cix,sky1-pcie-host.yaml
index b910a42e0843..d55d165f1e94 100644
--- a/Documentation/devicetree/bindings/pci/cix,sky1-pcie-host.yaml
+++ b/Documentation/devicetree/bindings/pci/cix,sky1-pcie-host.yaml
@@ -38,6 +38,9 @@ properties:
   ranges:
     maxItems: 3
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - ranges