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

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Message-Id: <1491852912-18712-1-git-send-email-john.stultz@linaro.org>
Date:   Mon, 10 Apr 2017 12:35:11 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Wei Xu <xuwei5@...ilicon.com>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Green <andy@...mcat.com>,
        Dave Long <dave.long@...aro.org>,
        Guodong Xu <guodong.xu@...aro.org>
Subject: [PATCH 1/2] ASoC: Improve hi6210-i2s DT bindings

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@...aro.org>
Cc: Liam Girdwood <lgirdwood@...il.com>
Cc: Mark Brown <broonie@...nel.org>
Cc: Jaroslav Kysela <perex@...ex.cz>
Cc: Wei Xu <xuwei5@...ilicon.com>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Andy Green <andy@...mcat.com>
Cc: Dave Long <dave.long@...aro.org>
Cc: Guodong Xu <guodong.xu@...aro.org>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 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@...18000{
 	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