* [RFC] sound: ASoC: multiple DAIs/codecs on single audio stream
@ 2013-04-16 17:45 Sebastian Hesselbarth
2013-04-17 14:13 ` Mark Brown
0 siblings, 1 reply; 2+ messages in thread
From: Sebastian Hesselbarth @ 2013-04-16 17:45 UTC (permalink / raw)
To: alsa-devel
Cc: Russell King, Liam Girdwood, Mark Brown, Jaroslav Kysela,
Takashi Iwai, LKML
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [RFC] sound: ASoC: multiple DAIs/codecs on single audio stream
2013-04-16 17:45 [RFC] sound: ASoC: multiple DAIs/codecs on single audio stream Sebastian Hesselbarth
@ 2013-04-17 14:13 ` Mark Brown
0 siblings, 0 replies; 2+ messages in thread
From: Mark Brown @ 2013-04-17 14:13 UTC (permalink / raw)
To: Sebastian Hesselbarth
Cc: alsa-devel, Russell King, Liam Girdwood, Jaroslav Kysela,
Takashi Iwai, LKML
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On Tue, Apr 16, 2013 at 07:45:08PM +0200, Sebastian Hesselbarth wrote:
> 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?
As discussed on IRC this is probably best represented using soc-pcm at
the minute.
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