linux-kernel - [PATCH 12/13] ASoC: dt-bindings: davinic-mcbsp: Add the 'ti,drive-dx' property

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Date: Fri, 15 Mar 2024 12:27:44 +0100
From: Bastien Curutchet <bastien.curutchet@...tlin.com>
To: Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Peter Ujfalusi <peter.ujfalusi@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Bastien Curutchet <bastien.curutchet@...tlin.com>
Cc: linux-sound@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	herve.codina@...tlin.com,
	christophercordahi@...ometrics.ca
Subject: [PATCH 12/13] ASoC: dt-bindings: davinic-mcbsp: Add the 'ti,drive-dx' property

McBSP is able to handle capture and playback stream.
The McBSP's DX pins that outputs serial data during playback streams can
be used to output a chosen pattern during capture streams. For instance,
this can be useful to drive an active-low signal during capture streams
(by choosing <0> as pattern)

Add a 'ti,drive-dx' property that can be used to repeatedly output a
chosen pattern on DX pin while capture stream is ON.

Signed-off-by: Bastien Curutchet <bastien.curutchet@...tlin.com>
---
 Documentation/devicetree/bindings/sound/davinci-mcbsp.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/davinci-mcbsp.yaml b/Documentation/devicetree/bindings/sound/davinci-mcbsp.yaml
index d8d4e7ea6e02..f4d1fc6bcd61 100644
--- a/Documentation/devicetree/bindings/sound/davinci-mcbsp.yaml
+++ b/Documentation/devicetree/bindings/sound/davinci-mcbsp.yaml
@@ -80,6 +80,13 @@ properties:
       Enable synchronisation error detections when an unexpected frame pulse is
       received. If not present, unexpected frame pulses are ignored.
 
+  ti,drive-dx:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      If the property is present, McBSP will repeatedly output the selected
+      value on DX pin during capture streams. For instance, if set to 0, this
+      can be used to drive an active-low signal.
+
 required:
   - "#sound-dai-cells"
   - compatible
-- 
2.43.2