Re: [alsa-devel] Counting links in simple-card

On Wed, Oct 9, 2019 at 3:18 AM Kuninori Morimoto kuninori.morimoto.gx@renesas.com wrote:

Hi Daniel

...

...

 * ex1)
 * CPU0 --- Codec0
 * CPU1 --- Codec1
 * CPU2 -----/
 * CPU3 --- Codec2
 *
 *    => 5 links = 2xCPU-Codec + 2xCPU-dummy + 1xdummy-Codec
 *    => 7 DAIs  = 4xCPU + 3xCodec
 *    => 1 ccnf  = 1xdummy-Codec

So, I don't understand exactly how did you get the formula for links. AFAICT there should be 3 x CPU-Codec + 1 x CPU-dummy.

CPU1/CPU2 and Codec1 are using DPCM. Thus, it is...

2xCPU-Codec: CPU0 - Codec0 CPU3 - Codec2

2xCPU-dummy: CPU1 - dummy CPU2 - dummy

1xdummy-Codec: dummy - Codec1

...

Also, I wonder how can i use simple-card to create just a backend link CPU-dummy + Codec :).

Is this supported?

Do you mean CPU-dummy + dummy-Codec ? But anyway, simple-card/audio-graph DPCM support is very limited. Unfortunately it doesn't have flexibility...

Yes, exactly. I need 1 DAI link with 1 FE + 1 BE for DSP / SOF usecase.