diff --git a/Documentation/devicetree/bindings/sound/rockchip,pdm.txt b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt
index ae2bfa8d1c00..3b6949741445 100644
--- a/Documentation/devicetree/bindings/sound/rockchip,pdm.txt
+++ b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt
@@ -6,6 +6,7 @@ Required properties:
   - "rockchip,px30-pdm"
   - "rockchip,rk1808-pdm"
   - "rockchip,rk3308-pdm"
+  - "rockchip,rk3568-pdm"
   - "rockchip,rv1126-pdm"
 - reg: physical base address of the controller and length of memory mapped
   region.