diff --git a/Documentation/devicetree/bindings/sound/rockchip-i2s.txt b/Documentation/devicetree/bindings/sound/rockchip-i2s.txt
index b4f0985cd8db..2d754b6dc8d1 100644
--- a/Documentation/devicetree/bindings/sound/rockchip-i2s.txt
+++ b/Documentation/devicetree/bindings/sound/rockchip-i2s.txt
@@ -30,6 +30,10 @@ Required properties:
 - rockchip,playback-channels: max playback channels, if not set, 8 channels default.
 - rockchip,capture-channels: max capture channels, if not set, 2 channels default.
 - rockchip,bclk-fs: configure the i2s bclk fs.
+- 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
+   - 2: only rx_lrck/bclk is used
 - rockchip,no-dmaengine: This is a boolean property. If present, driver will do not
   register pcm dmaengine, only just register dai. if the dai is part of multi-dais,
   the property should be present. Please refer to rockchip,multidais.txt about