linux-kernel - [RFC] sound: ASoC: multiple DAIs/codecs on single audio stream

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Date:	Tue, 16 Apr 2013 19:45:08 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	alsa-devel@...a-project.org
CC:	Russell King <linux@....linux.org.uk>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [RFC] sound: ASoC: multiple DAIs/codecs on single audio stream

Hi,

I am rewriting Marvell Kirkwood/Dove audio driver and I am having
a hard time to match the controllers features to ASoC API.

The controller has a dma controller for one playback buffer. It can
play the stream to both I2S and SPDIF interfaces with independent mute.

Now, for example, I have a board with i2s codec and spdif tx diode
connected to the above controller:

DMA (platform) -+-> I2S (dai) ----> I2S_Codec (codec)
                 |
                 +-> SPDIF (dai) --> SPDIF_TX (codec)

Is there any way in the current ASoC API to have the above setup?

I tried to attach two codecs to a single DAI and that will already
create two playback streams with two buffers. I guess it will also
happen if I have two DAIs connected to the same platform driver?

For an API for SoC audio, shouldn't there be some relation between
platform, DAI, and codec, e.g.:
- a platform represents a single audio stream buffer
- a platform can be attached to one or more DAIs,
- a DAI can be attached to one codec only

Regards,
   Sebastian
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