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.
- select snd-soc-dummy as platfrom
- 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.