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ASoC: dt-bindings: davinci-mcbsp: Add the 'ti,T1-framing-{rx/tx}' flags

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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>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Link: https://msgid.link/r/20240402071213.11671-13-bastien.curutchet@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Bastien Curutchet 2024-04-02 09:12:12 +02:00 committed by Mark Brown
parent 92e7bb2b6a
commit 609302ca04
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1 changed files with 14 additions and 0 deletions
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14
Documentation/devicetree/bindings/sound/davinci-mcbsp.yaml
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@ -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