[PATCH 1/8] dmaengine: Add API to combine configuration and preparation (sg and single)

[Frank Li]

On Tue, Dec 09, 2025 at 07:38:09AM +0100, Christoph Hellwig wrote:
> On Mon, Dec 08, 2025 at 12:09:40PM -0500, Frank Li wrote:
> > Previously, configuration and preparation required two separate calls. This
> > works well when configuration is done only once during initialization.
> >
> > However, in cases where the burst length or source/destination address must
> > be adjusted for each transfer, calling two functions is verbose and
> > requires additional locking to ensure both steps complete atomically.
> >
> > Add a new API and callback device_prep_slave_sg_config that combines
> > configuration and preparation into a single operation. If the configuration
> > argument is passed as NULL, fall back to the existing implementation.
>
> Maybe this would be a good time to start retiring the "slave" naming
> and come up with shorter names as a win-win situation?

Yes, 'prep_sg_config' or 'prep_sg' should be enough.

Frank
>