The #sound-dai-cells property might be helpful in selecting primary
or secondary CPU DAI and it's already present in i2s nodes for some
exynos SoCs so let's add it to the DT binding documentation.

Signed-off-by: Sylwester Nawrocki <s.nawro...@samsung.com>
---
Changes since v1:
 - the property moved to the "Optional SoC Specific Properties"
   paragraph.
---
 Documentation/devicetree/bindings/sound/samsung-i2s.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/samsung-i2s.txt 
b/Documentation/devicetree/bindings/sound/samsung-i2s.txt
index c1f508f18ac8..a88cb00fa096 100644
--- a/Documentation/devicetree/bindings/sound/samsung-i2s.txt
+++ b/Documentation/devicetree/bindings/sound/samsung-i2s.txt
@@ -60,6 +60,7 @@ Optional SoC Specific Properties:
   sub system(used in secondary sound source).
 - pinctrl-0: Should specify pin control groups used for this controller.
 - pinctrl-names: Should contain only one value - "default".
+- #sound-dai-cells: should be 1.
 
 
 Example:
@@ -79,4 +80,5 @@ i2s0: i2s@3830000 {
        samsung,idma-addr = <0x03000000>;
        pinctrl-names = "default";
        pinctrl-0 = <&i2s0_bus>;
+       #sound-dai-cells = <1>;
 };
-- 
2.14.2

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