diff --git a/Documentation/devicetree/bindings/sound/rockchip,i2s-tdm.txt b/Documentation/devicetree/bindings/sound/rockchip,i2s-tdm.txt
index d402125f315e..23865f191b7b 100644
--- a/Documentation/devicetree/bindings/sound/rockchip,i2s-tdm.txt
+++ b/Documentation/devicetree/bindings/sound/rockchip,i2s-tdm.txt
@@ -6,6 +6,7 @@ Required properties:
    - "rockchip,px30-i2s-tdm": for px30
    - "rockchip,rk1808-i2s-tdm": for rk1808
    - "rockchip,rk3308-i2s-tdm": for rk3308
+   - "rockchip,rk3568-i2s-tdm": for rk3568
    - "rockchip,rv1126-i2s-tdm": for rv1126
 - reg: physical base address of the controller and length of memory mapped
   region.