The CS35L45 has SYNC pin that can be used as a multi
device synchronization (MDSYNC) bus. This pin can send
various message types between Cirrus devices.

This patch series adds support for long and short DSP
messages between CS35L45 devices. 

Each device on the SYNC bus must have a unique transmitter
identifier per message type as the bus arbitrates message
priority via this identifier. These identifiers are set by
the introduced devicetree properties. The priority 
assignment is intended to be a static system integration
decision.

The relevant receiver controls are introduced as mixer
controls so they are exposed at runtime to be configured
for the appropriate use cases.

Changes since v1:
 - Fixed property parsing namespace issue

Changes since v2:
 - snd_soc_kcontrol_component -> snd_kcontrol_chip
 - only register sync controls if GPIO mux selects SYNC
 - return 1 on cs35l45_sync_en_put success
 - drop | in dt property description

Ricardo Rivera-Matos (2):
  ASoC: dt-bindings: cs35l45: Adds SYNC properties
  ASoC: cs35l45: Adds support for SYNC bus

 .../bindings/sound/cirrus,cs35l45.yaml        | 27 ++++++
 sound/soc/codecs/cs35l45-tables.c             |  4 +
 sound/soc/codecs/cs35l45.c                    | 93 ++++++++++++++++++-
 sound/soc/codecs/cs35l45.h                    | 23 +++++
 4 files changed, 143 insertions(+), 4 deletions(-)


base-commit: 2792cc1b80b7674cc0751b34a964aad76630c1fa
-- 
2.43.0

On Fri, Aug 21, 2026 at 04:09:44PM +0000, Ricardo Rivera-Matos wrote:
> The CS35L45 has SYNC pin that can be used as a multi
> device synchronization (MDSYNC) bus. This pin can send
> various message types between Cirrus devices.

Something is broken with how you're posting your patches which
consistently causes your cover letter to appear as the last message in
the series rather than the first.  Not sure what's up with that, haven't
seen other people with similar issues.

You might want to look at b4 to send the patches, especially it's web
submission endpoint which avoids having to configure mail:

   https://b4.docs.kernel.org/en/latest/contributor/overview.html

On 8/21/26 11:23 AM, Mark Brown wrote:
> On Fri, Aug 21, 2026 at 04:09:44PM +0000, Ricardo Rivera-Matos wrote:
>> The CS35L45 has SYNC pin that can be used as a multi
>> device synchronization (MDSYNC) bus. This pin can send
>> various message types between Cirrus devices.
> 
> Something is broken with how you're posting your patches which
> consistently causes your cover letter to appear as the last message in
> the series rather than the first.  Not sure what's up with that, haven't
> seen other people with similar issues.
> 
> You might want to look at b4 to send the patches, especially it's web
> submission endpoint which avoids having to configure mail:
> 
>     https://b4.docs.kernel.org/en/latest/contributor/overview.html
> 

Thanks for the tip. I'll give it a shot on v4.