diff --git a/Documentation/devicetree/bindings/soc/rockchip/grf.txt b/Documentation/devicetree/bindings/soc/rockchip/grf.txt
index a0685c209218..de8b983f2ccd 100644
--- a/Documentation/devicetree/bindings/soc/rockchip/grf.txt
+++ b/Documentation/devicetree/bindings/soc/rockchip/grf.txt
@@ -16,6 +16,7 @@ Required Properties:
    - "rockchip,rk3188-grf", "syscon": for rk3188
    - "rockchip,rk3228-grf", "syscon": for rk3228
    - "rockchip,rk3288-grf", "syscon": for rk3288
+   - "rockchip,rk3328-grf", "syscon": for rk3328
    - "rockchip,rk3368-grf", "syscon": for rk3368
    - "rockchip,rk3399-grf", "syscon": for rk3399
 - compatible: PMUGRF should be one of the following: