linux-kernel - Re: [PATCH v2 0/4] ASoC: ti: davinci-mcasp: Add asynchronous mode support for McASP

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Message-ID: <2b3e4e63-907e-462c-ab90-0a1a94d91e77@gmail.com>
Date: Wed, 4 Feb 2026 18:05:40 +0200
From: Péter Ujfalusi <peter.ujfalusi@...il.com>
To: Sen Wang <sen@...com>, broonie@...nel.org, lgirdwood@...il.com,
 perex@...ex.cz, tiwai@...e.com, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org
Cc: linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] ASoC: ti: davinci-mcasp: Add asynchronous mode
 support for McASP



On 03/02/2026 02:36, Sen Wang wrote:
> This series adds asynchronous mode support to the McASP driver, which
> enables independent configuration of bitclocks, frame sync, and audio
> configurations between tx(playback) and rx(record). And achieves
> simultaneous playback & record using different audio configurations.
> 
> It also adds two clean up patches to the McASP driver that disambiguate
> and simplifies the logic which avoids the async enhancement from being
> too convoluted to review and analyze.
> 
> The implementation is based on vendor documentation and patches tested in
> both SK-AM62P-LP (sync mode, McASP slave) and AM62D-EVM
> (async mode, McASP master, rx & tx has different TDM configs).
> Testing verifies async mode functionality while maintaining backward
> compatibility with the default sync mode.
> 
> Bootlog and Async mode tests on AM62D-EVM: [0]
> 
> [0]: https://gist.github.com/SenWang125/f31f9172b186d414695e37c8b9ef127d

it is a shame that I never had a setup where this can be tested.

Acked-by: Peter Ujfalusi <peter.ujfalusi@...il.com>

> 
> Signed-off-by: Sen Wang <sen@...com>
> 
> Changes in v2:
>   - Corrected patch 1 subject title
>   - Retained original order of operation in patch 3
>   - Corrected code comments to use inclusive terminology in patch 4
> 
> Sen Wang (4):
>   ASoC: dt-bindings: davinci-mcasp: Add properties for asynchronous mode
>   ASoC: ti: davinci-mcasp: Disambiguate mcasp_is_synchronous function
>   ASoC: ti: davinci-mcasp: Streamline pdir behavior across rx & tx streams
>   ASoC: ti: davinci-mcasp: Add asynchronous mode support
> 
>  .../bindings/sound/davinci-mcasp-audio.yaml   |  71 ++-
>  include/linux/platform_data/davinci_asp.h     |   3 +-
>  sound/soc/ti/davinci-mcasp.c                  | 510 ++++++++++++++----
>  sound/soc/ti/davinci-mcasp.h                  |  10 +
>  4 files changed, 481 insertions(+), 113 deletions(-)
> 
> 
> base-commit: dbf8fe85a16a33d6b6bd01f2bc606fc017771465

-- 
Péter