[alsa-devel] [PATCH 8/8] ASoC: add snd-soc-dummy DT support

[Lars-Peter Clausen]

On 08/20/2014 09:13 AM, Kuninori Morimoto wrote:
> From: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
>
> This patch adds snd-soc-dummy DT binding support.

The devicetree describes the hardware, the snd-soc-dummy is a software only 
thing and should not be found in the devicetree.

> It removes .stream_name from dummy_dai,
> because "Playback" / "Capture" is very popular naming.
>
> The DAPM will lost correct route settings
> if other CPU/Codec was using same stream name.
> And it will be problem when DPCM case.
> Like below
>
> FE CPU   (rsnd):   "DAI0 Playback"
>     Codec (dummy):  "Playback"
>
> BE CPU   (dummy):  "Playback"
>     Codec (ak4642): "Playback"


That's something we need to fix, but I don't think removing the stream names 
is the right way to do this. In a multi CODEC environment you'll quite 
likely end up with widgets of the same name. Ideally a route endpoint would 
be expressed by a tuple of DT node and pin name. But I don't think it is 
possible to mix integer and string elements in a property.