linux-kernel - Re: [alsa-devel] [PATCH] ASoC: generic: add generic compound card with DT support

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Message-ID: <20140102131045.GZ31886@sirena.org.uk>
Date:	Thu, 2 Jan 2014 13:10:45 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Jean-Francois Moine <moinejf@...e.fr>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	Liam Girdwood <lgirdwood@...il.com>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH] ASoC: generic: add generic compound card
 with DT support

On Thu, Jan 02, 2014 at 01:44:37PM +0100, Jean-Francois Moine wrote:

> I still don't understand. There is already such cases in the Cubox:
> the S/PDIF output from the kirkwood audio controller is connected to
> both the HDMI transmitter and the S/PDIF TOSLINK. So, in the audio
> controller, the port @1 defines the S/PDIF DAI and the endpoints @0 and
> @1 point to the remote DAIs, creating 2 snd DAI links:

> 	port@1 {
> 		audio_hdmi_spdif: endpoint@0 {
> 			remote-endpoint = <&hdmi_spdif_audio>;
> 		};
> 		audio_spdif: endpoint@1 {
> 			remote-endpoint = <&spdif_audio>;
> 		};
> 	};

Oh, so the endpoints are virtual and that's supposed to be three things
wired together rather than a single device with multiple links?  That's
really not very clear from reading the above and seems cumbersome -
every device will want to explicitly identify every other device on the
link and any configuration is going to either need to be replicated on
every device or we'll need to check lots of places for the configuation.
It seems like this will be hard to work with.

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