diff --git a/Documentation/devicetree/bindings/soc/rockchip/grf.txt b/Documentation/devicetree/bindings/soc/rockchip/grf.txt
index 013e71a2cdc7..c6e62cb30712 100644
--- a/Documentation/devicetree/bindings/soc/rockchip/grf.txt
+++ b/Documentation/devicetree/bindings/soc/rockchip/grf.txt
@@ -5,11 +5,13 @@ is composed of many registers for system control.
 
 From RK3368 SoCs, the GRF is divided into two sections,
 - GRF, used for general non-secure system,
+- SGRF, used for general secure system,
 - PMUGRF, used for always on system
 
 Required Properties:
 
 - compatible: GRF should be one of the followings
+   - "rockchip,rk3036-grf", "syscon": for rk3036
    - "rockchip,rk3066-grf", "syscon": for rk3066
    - "rockchip,rk3188-grf", "syscon": for rk3188
    - "rockchip,rk3228-grf", "syscon": for rk3228
@@ -19,6 +21,8 @@ Required Properties:
 - compatible: PMUGRF should be one of the followings
    - "rockchip,rk3368-pmugrf", "syscon": for rk3368
    - "rockchip,rk3399-pmugrf", "syscon": for rk3399
+- compatible: SGRF should be one of the following
+   - "rockchip,rk3288-sgrf", "syscon": for rk3288
 - reg: physical base address of the controller and length of memory mapped
   region.