On Mon, Mar 25, 2019 at 10:54:52AM +0900, Kuninori Morimoto wrote:

> This is my understanding, please correct me if I was wrong.
> I think current many sound card which doesn't need "platfrom" are 2 patterns.

> 	1) select snd-soc-dummy as platfrom
> 	2) select cpu component as platfrom

> Current ASoC selects 1) automatically if .platfrom_name was NULL.
> And driver needs to have below if it want to be 2)

> 	dai_link->platform_of_node = dai_link->cpu_of_node

> But, I think one of them is enough ?
> I mean select 2) automatically can be OK?
> In other words, current some sound card which doesn't need
> platfrom is calling snd-soc-dummy platfrom method in 1) case.
> But, is it needed ? I'm not sure...

> It seems snd-soc-dummy platfrom is caring about DPCM-BE case,
> but, I think CPU is snd-soc-dummy in such case.
> Maybe we need same cade to dummy CPU (?), but *my* DPCM system
> is working correctly without it.

It *should* work without it.  If it actually does work is a separate
question - that code is a bit fragile so there may be some problems.
Since the most complicated user of DPCM is x86 I think if a change to
this stuff tests out well there it should be OK.