diff --git a/Documentation/devicetree/bindings/net/hisilicon-hns-mdio.txt b/Documentation/devicetree/bindings/net/hisilicon-hns-mdio.txt
index 9c23fdf25018ba7b6b8a87fd41653f216c908167..4a7ede9657b08211675a7329ff5cc3b5bd6e90e7 100644
--- a/Documentation/devicetree/bindings/net/hisilicon-hns-mdio.txt
+++ b/Documentation/devicetree/bindings/net/hisilicon-hns-mdio.txt
@@ -1,7 +1,12 @@
 Hisilicon MDIO bus controller
 
 Properties:
-- compatible: "hisilicon,mdio","hisilicon,hns-mdio".
+- compatible: can be one of:
+	"hisilicon,hns-mdio"
+	"hisilicon,mdio"
+  "hisilicon,hns-mdio" is recommended to be used for hip05 and later SOCs,
+  while "hisilicon,mdio" is optional for backwards compatibility only on
+  hip04 Soc.
 - reg: The base address of the MDIO bus controller register bank.
 - #address-cells: Must be <1>.
 - #size-cells: Must be <0>.  MDIO addresses have no size component.