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

[Mark Brown]

On Sat, Oct 03, 2015 at 11:01:40PM +0800, Koro Chen wrote:
> On Fri, 2015-10-02 at 15:48 +0100, Mark Brown wrote:
> > On Fri, Oct 02, 2015 at 06:34:24PM +0800, Koro Chen wrote:

> > > I have two cards originally but the second one failed because of the
> > > patch ASoC: Prevent components from being bound to multiple cards.

> > > My configuration is like this:
> > > card0: use platform's DAI component A
> > > card1: use the same platform's DAI component B

> > What do you mean by "DAI component" here?  It's not a term I'm familiar
> > with...

> 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.
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