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Re: [PATCH] ASoC: mediatek: Add second I2S on mt8173-rt5650 machine driver

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  Re: [PATCH] ASoC: mediatek: Add second I2S on mt8173-rt5650 machine  driver PC Liao <pc.liao@mediatek.com> - 2016-04-06 16:00 +0200
    Re: [PATCH] ASoC: mediatek: Add second I2S on mt8173-rt5650 machine  driver Mark Brown <broonie@kernel.org> - 2016-04-06 19:20 +0200

#1372544 — Re: [PATCH] ASoC: mediatek: Add second I2S on mt8173-rt5650 machine driver

Hi Mark,

On Sun, 2016-04-03 at 01:04 +0800, Mark Brown wrote:
> On Fri, Apr 01, 2016 at 10:50:52AM +0800, PC Liao wrote:
> > On Wed, 2016-03-30 at 00:07 +0800, Mark Brown wrote:
> 
> > > This sort of arrangement is very common - it's often needed to get
> > > different sample rates for playback and capture.  Normally it'd be
> > > represented in the DT by having the two DAI links specified normally and
> > > then having the driver look at the DT to see what's connected to work
> > > out what mode to use.
> 
> > Could you please suggest the reference driver about this?
> 
> Any driver that can identify an individual DAI within a device by using
> sound-dai references, even simple-card does this.

Thanks for suggestion.
This machine driver is based on DPCM.
Should I add BE DAI and use DAPM, then using ucm-config(mixer control)
to control the path?
Or, do I think the wrong direction?
Thanks!

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#1372675

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On Wed, Apr 06, 2016 at 09:58:25PM +0800, PC Liao wrote:
> On Sun, 2016-04-03 at 01:04 +0800, Mark Brown wrote:

> > Any driver that can identify an individual DAI within a device by using
> > sound-dai references, even simple-card does this.

> Thanks for suggestion.
> This machine driver is based on DPCM.
> Should I add BE DAI and use DAPM, then using ucm-config(mixer control)
> to control the path?
> Or, do I think the wrong direction?
> Thanks!

It sounds like the configuration is fixed in these systems and can't
be usefully varied at runtime?  If that's the case then there's no need
for a userspace control.

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