diff --git a/Documentation/devicetree/bindings/pinctrl/rockchip,pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/rockchip,pinctrl.txt
index 403b5a272f567c5abb19d9edd93eca9682ad8ba0..ee01ab58224d5e3907b3a115dcf6d0d8ed7c595f 100644
--- a/Documentation/devicetree/bindings/pinctrl/rockchip,pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/rockchip,pinctrl.txt
@@ -19,11 +19,18 @@ The pins are grouped into up to 5 individual pin banks which need to be
 defined as gpio sub-nodes of the pinmux controller.
 
 Required properties for iomux controller:
-  - compatible: one of "rockchip,rk1108-pinctrl", "rockchip,rk2928-pinctrl"
-		       "rockchip,rk3066a-pinctrl", "rockchip,rk3066b-pinctrl"
-		       "rockchip,rk3188-pinctrl", "rockchip,rk3228-pinctrl"
-		       "rockchip,rk3288-pinctrl", "rockchip,rk3328-pinctrl"
-		       "rockchip,rk3368-pinctrl", "rockchip,rk3399-pinctrl"
+  - compatible: should be
+		"rockchip,rv1108-pinctrl":  for Rockchip RV1108
+		"rockchip,rk2928-pinctrl":  for Rockchip RK2928
+		"rockchip,rk3066a-pinctrl": for Rockchip RK3066a
+		"rockchip,rk3066b-pinctrl": for Rockchip RK3066b
+		"rockchip,rk3188-pinctrl":  for Rockchip RK3188
+		"rockchip,rk3228-pinctrl":  for Rockchip RK3228
+		"rockchip,rk3288-pinctrl":  for Rockchip RK3288
+		"rockchip,rk3328-pinctrl":  for Rockchip RK3328
+		"rockchip,rk3368-pinctrl":  for Rockchip RK3368
+		"rockchip,rk3399-pinctrl":  for Rockchip RK3399
+
   - rockchip,grf: phandle referencing a syscon providing the
 	 "general register files"