[alsa-devel] Question about patch ASoC: Prevent components from being bound to multiple cards

[Mark Brown]

On Mon, Oct 05, 2015 at 11:07:17AM +0100, Mark Brown wrote:
> On Sat, Oct 03, 2015 at 11:01:40PM +0800, Koro Chen wrote:

> > Sorry I didn't make myself clear enough. In the
> > sound/soc/mediatek/mtk-afe-pcm.c, I register two components
> > "mtk_afe_pcm_dai_component" and "mtk_afe_hdmi_dai_component", each has
> > its corresponding DAIs. Card0 (which is mt8173-rt5676-rt5650.c) uses
> > DAIs from the first component, and card1 (new) uses DAIs of the second
> > component. These two components are probed successfully and separately
> > by card0 and card1, but card1 failed to probe another component created
> > by snd_soc_register_platform(), which is already bound to card0.

> OK, I see.  We probably do want to relax that restriction, it makes more
> sense at the DAI level but at the component level when we have
> components that have a bunch of independant DAIs hanging off a DMA
> controler as one component (which does make sense) then it breaks.

Oh, one other thing here - if there is routing within your component
which would allow the two cards to be interconnected then that's a bit
different and the cards should probably be combined into one.
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