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-rw-r--r--dts/Bindings/sound/rockchip-i2s.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/dts/Bindings/sound/rockchip-i2s.txt b/dts/Bindings/sound/rockchip-i2s.txt
index 6e86d8aa29..4ea29aa9af 100644
--- a/dts/Bindings/sound/rockchip-i2s.txt
+++ b/dts/Bindings/sound/rockchip-i2s.txt
@@ -23,6 +23,11 @@ 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.
+Required properties for controller which support multi channels
+playback/capture:
+
+- rockchip,grf: the phandle of the syscon node for GRF register.
+
Example for rk3288 I2S controller:
i2s@ff890000 {