diff --git a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt
index c2c50b59873d..3e10f807dd9d 100644
--- a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt
+++ b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt
@@ -7,6 +7,7 @@ Required properties:
    - "rockchip,rk3328-saradc", "rockchip,rk3399-saradc": for rk3328
    - "rockchip,rk3399-saradc": for rk3399
    - "rockchip,rv1108-saradc", "rockchip,rk3399-saradc": for rv1108
+   - "rockchip,rk1808-saradc", "rockchip,rk3399-saradc": for rk1808
 
 - reg: physical base address of the controller and length of memory mapped
        region.