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From: Bastien Curutchet <bastien.curutchet@bootlin.com>
To: Liam Girdwood <lgirdwood@gmail.com>,
	Mark Brown <broonie@kernel.org>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Peter Ujfalusi <peter.ujfalusi@gmail.com>,
	Jaroslav Kysela <perex@perex.cz>,
	Takashi Iwai <tiwai@suse.com>,
	Bastien Curutchet <bastien.curutchet@bootlin.com>
Cc: linux-sound@vger.kernel.org,
	devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	alsa-devel@alsa-project.org,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	herve.codina@bootlin.com,
	christophercordahi@nanometrics.ca
Subject: [PATCH v2 12/13] ASoC: dt-bindings: davinci-mcbsp: Add the 'ti,T1-framing-{rx/tx}' flags
Date: Tue,  2 Apr 2024 09:12:12 +0200
Message-ID: <20240402071213.11671-13-bastien.curutchet@bootlin.com>
In-Reply-To: <20240402071213.11671-1-bastien.curutchet@bootlin.com>
References: <20240402071213.11671-1-bastien.curutchet@bootlin.com>
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McBSP's data delay can be configured from 0 to 2 bit clock periods. 0 is
used for DSP_B format, 1 for DSP_A format. A data delay of 2 bit clock
periods can be used to interface to 'T1 framing' devices where data
stream is preceded by a 'framing bit'. This 2 bit clock data delay is
not described in the bindings.

Add two flags 'ti,T1-framing-[rx/tx]' to enable a data delay of 2
bit clock periods in reception or transmission.

Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com>
---
 .../devicetree/bindings/sound/davinci-mcbsp.yaml   | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/davinci-mcbsp.yaml b/Documentation/devicetree/bindings/sound/davinci-mcbsp.yaml
index 0c2b1936c6a1..4fa677023827 100644
--- a/Documentation/devicetree/bindings/sound/davinci-mcbsp.yaml
+++ b/Documentation/devicetree/bindings/sound/davinci-mcbsp.yaml
@@ -67,6 +67,20 @@ properties:
   "#sound-dai-cells":
     const: 0
 
+  ti,T1-framing-tx:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      If the property is present, tx data delay is set to 2 bit clock periods.
+      McBSP will insert a blank period (high-impedance period) before the first
+      data bit. This can be used to interface to T1-framing devices.
+
+  ti,T1-framing-rx:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      If the property is present, rx data delay is set to 2 bit clock periods.
+      McBSP will discard the bit preceding the data stream (called framing bit).
+      This can be used to interface to T1-framing devices.
+
 required:
   - "#sound-dai-cells"
   - compatible
-- 
2.44.0