diff --git a/Documentation/devicetree/bindings/gpio/rockchip,gpio-bank.yaml b/Documentation/devicetree/bindings/gpio/rockchip,gpio-bank.yaml
index bdd83f42615c..774e9c7de606 100644
--- a/Documentation/devicetree/bindings/gpio/rockchip,gpio-bank.yaml
+++ b/Documentation/devicetree/bindings/gpio/rockchip,gpio-bank.yaml
@@ -44,6 +44,13 @@ properties:
   power-domains:
     maxItems: 1
 
+  rockchip,grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      The phandle of the syscon node managing the IO control registers
+      of this bank, on SoCs such as the RV1106 where each GPIO bank has
+      its own IOC block.
+
 patternProperties:
   "^.+-hog(-[0-9]+)?$":
     type: object