linux-kernel - [PATCH 2/2] dt-bindings: ASoC: axi-i2s: make both "rx" and "tx" optional

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Date:   Thu,  7 Mar 2019 22:44:56 +0100
From:   Luca Ceresoli <luca@...aceresoli.net>
To:     alsa-devel@...a-project.org, devicetree@...r.kernel.org
Cc:     Luca Ceresoli <luca@...aceresoli.net>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] dt-bindings: ASoC: axi-i2s: make both "rx" and "tx" optional

Both the capture and playback channels are optional in the axi_i2s IP
block. Document how to tell the driver which channels are
instantiated.

Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>
---
 Documentation/devicetree/bindings/sound/adi,axi-i2s.txt | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/adi,axi-i2s.txt b/Documentation/devicetree/bindings/sound/adi,axi-i2s.txt
index 4248b662deff..229ad1392cdc 100644
--- a/Documentation/devicetree/bindings/sound/adi,axi-i2s.txt
+++ b/Documentation/devicetree/bindings/sound/adi,axi-i2s.txt
@@ -1,5 +1,8 @@
 ADI AXI-I2S controller
 
+The core can be generated with transmit (playback), only receive
+(capture) or both directions enabled.
+
 Required properties:
  - compatible : Must be "adi,axi-i2s-1.00.a"
  - reg : Must contain I2S core's registers location and length
@@ -9,8 +12,8 @@ Required properties:
  - clock-names : "axi" for the clock to the AXI interface, "ref" for the sample
    rate reference clock.
  - dmas: Pairs of phandle and specifier for the DMA channels that are used by
-   the core. The core expects two dma channels, one for transmit and one for
-   receive.
+   the core. The core expects two dma channels if both transmit and receive are
+   enabled, one channel otherwise.
  - dma-names : "tx" for the transmit channel, "rx" for the receive channel.
 
 For more details on the 'dma', 'dma-names', 'clock' and 'clock-names' properties
-- 
2.17.1