[PATCH 1/2] ASoC: Improve hi6210-i2s DT bindings

[John Stultz]

This patch improves the previously submitted hi6210-i2s DT
binding, adding extra details to how the multi-dai index
value maps to the potential interfaces.
(Currently just index 0 -> the S2 interface, as there is
only one supported, but in the future other interfaces may
be enabled.)

Cc: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
Cc: Liam Girdwood <lgirdwood@xxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Jaroslav Kysela <perex@xxxxxxxx>
Cc: Wei Xu <xuwei5@xxxxxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Andy Green <andy@xxxxxxxxxxx>
Cc: Dave Long <dave.long@xxxxxxxxxx>
Cc: Guodong Xu <guodong.xu@xxxxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
 Documentation/devicetree/bindings/sound/hisilicon,hi6210-i2s.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/hisilicon,hi6210-i2s.txt b/Documentation/devicetree/bindings/sound/hisilicon,hi6210-i2s.txt
index 680bb035..7a29678 100644
--- a/Documentation/devicetree/bindings/sound/hisilicon,hi6210-i2s.txt
+++ b/Documentation/devicetree/bindings/sound/hisilicon,hi6210-i2s.txt
@@ -17,6 +17,10 @@ Required properties:
 - dma-names: should be "tx" and "rx"
 - hisilicon,sysctrl-syscon: phandle to sysctrl syscon
 - #sound-dai-cells: Should be set to 1 (for multi-dai)
+   - The dai cell indexes reference the following interfaces:
+       0: S2 interface
+       (Currently that is the only one available, but more may be
+        supported in the future)
 
 Example for the hi6210 i2s controller:
 
@@ -32,3 +36,7 @@ i2s0: i2s@f7118000{
 	hisilicon,sysctrl-syscon = <&sys_ctrl>;
 	#sound-dai-cells = <1>;
 };
+
+Then when referencing the i2s controller:
+	sound-dai = <&i2s0 0>; /* index 0 => S2 interface */
+
-- 
2.7.4