diff --git a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml
index 9b9882323cac..7653aa4809db 100644
--- a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml
@@ -17,6 +17,7 @@ properties:
       - const: rockchip,rk3399-saradc
       - items:
           - enum:
+            - rockchip,rk3308-saradc
             - rockchip,rk3328-saradc
             - rockchip,rv1108-saradc
           - const: rockchip,rk3399-saradc