diff --git a/Documentation/devicetree/bindings/soc/rockchip/grf.yaml b/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
index 61f38b68a4a3..b4ed4cb555bd 100644
--- a/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
+++ b/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
@@ -15,6 +15,7 @@ properties:
       - items:
           - enum:
               - rockchip,rk3288-sgrf
+              - rockchip,rk3528-ioc-grf
               - rockchip,rk3566-pipe-grf
               - rockchip,rk3568-pcie3-phy-grf
               - rockchip,rk3568-pipe-grf