[alsa-devel] [PATCH v4 08/13] ASoC: Add SoundWire stream programming interface

[Vinod Koul]

On Mon, Apr 23, 2018 at 08:33:08AM -0500, Pierre-Louis Bossart wrote:
> On 4/21/18 10:58 AM, Vinod Koul wrote:
> >On Sat, Apr 21, 2018 at 06:59:49AM -0700, Pierre-Louis Bossart wrote:
> >>
> >>>+/**
> >>>+ * snd_soc_dai_set_sdw_stream() - Configures a DAI for SDW stream operation
> >>>+ * @dai: DAI
> >>>+ * @stream: STREAM
> >>>+ * @direction: Stream direction(Playback/Capture)
> >>>+ * SoundWire subsystem doesn't have a notion of direction and we reuse
> >>>+ * the ASoC stream direction to configure sink/source ports.
> >>>+ * Playback maps to source on the TX and sink on Rx. Vice-versa for Capture.
> >>
> >>this is just confusing...
> >>
> >>This should be something like
> >>"use Playback for source ports and Capture for sink ports".
> >
> >Source port on ...? This is also confusing to me!
> >
> >For playback there are two ports, one on transmitter aka
> >TX and one on receiver aka RX. For Tx we use source port, and Rx uses sink
> >ports. I should probably add port to make people really figure out we are
> >talking about ports!
> >
> >So:
> >
> >Playback maps to source port on the TX and sink port on Rx. Vice-versa for Capture.
> >
> >Do you agree to above statement?
> 
> No. Source port and TX are redundant definitions, and your wording isn't
> clear: is the PLAYBACK/CAPTURE qualifier for the stream or the DAI used by
> the stream?

Yes they are redundant, will update. PLAYBACK/CAPTURE qualifier is for stream.

-- 
~Vinod