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

[Vinod Koul <vkoul@kernel.org>]

On 18-12-23, 14:29, Charles Keepax wrote:
> On Mon, Dec 18, 2023 at 01:58:47PM +0100, Pierre-Louis Bossart wrote:
> > > why not have a single API that does both? First check if it is supported
> > > and then allocate buffers and do the transfer.. What are the advantages
> > > of using this two step process
> > 
> > Symmetry is the only thing that comes to my mind. Open - close and send
> > - wait are natural matches, aren't they?
> > 
> > We do need a wait(), so bundling open() and send() would be odd.
> > 
> 
> I agree send->wait->close would be odd, But you just bundle close
> into wait. So the API becomes just send->wait, which seems pretty
> logical.

You would drop close as well, only send and wait...

> 
> > But you have a point that the open() is not generic in that it also
> > prepares the DMA buffers for transmission. Maybe it's more natural to
> > follow the traditional open(), hw_params(), hw_free, close() from ALSA.
> 
> I think this just makes it worse, you are now adding even more
> calls. The problem I see here is that, open and close (at least to
> me) strongly implies that you can do multiple operations between
> them and unless I have misunderstood something here you can't.
> 
> Thanks,
> Charles

-- 
~Vinod