Re: [RFC PATCH 01/16] Documentation: driver: add SoundWire BRA description

[Mark Brown <broonie@xxxxxxxxxx>]

On Tue, Dec 19, 2023 at 05:50:30PM +0100, Pierre-Louis Bossart wrote:

> > grep for regmap_.*async - cs_dsp.c is the upstream example in a driver,
> > or there's the rbtree cache sync code which uses a back door to go into
> > an async mode.  Basically just variants of all the normal regmap I/O
> > calls with a _complete() call you can use to wait for everything to
> > happen.  The implementation is a bit heavyweight since it was written to
> > work with fairly slow buses.

> I spent a fair amount of time this afternoon trying to understand the
> regmap_async parts, and I am not following where in the code there is an
> ordering requirement/enforcement between async and sync usages.

The only actual async implementation is SPI which processes things in
order of submission, the sync API wraps the async API.

> Also is this just me spacing out or there is no regmap_raw_read_async()?

Right, there was never any need.

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