diff --git a/Documentation/devicetree/bindings/sound/rockchip,i2s-tdm.txt b/Documentation/devicetree/bindings/sound/rockchip,i2s-tdm.txt
index db130be87d47..c4fcbe501885 100644
--- a/Documentation/devicetree/bindings/sound/rockchip,i2s-tdm.txt
+++ b/Documentation/devicetree/bindings/sound/rockchip,i2s-tdm.txt
@@ -20,6 +20,8 @@ Required properties:
 - rockchip,cru: cru phandle.
 - rockchip,grf: the phandle of the syscon node for GRF register.
 - rockchip,mclk-calibrate: enable mclk source calibration.
+- rockchip,io-multiplex: This is a boolean property. If present, the driver will
+  handle the IO multiplex during playback and capture.
 - rockchip,clk-trcm: tx and rx lrck/bclk common use.
    - 0: both tx_lrck/bclk and rx_lrck/bclk are used
    - 1: only tx_lrck/bclk is used