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

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Date:	Wed, 6 Apr 2016 21:58:25 +0800
From:	PC Liao <pc.liao@...iatek.com>
To:	Mark Brown <broonie@...nel.org>
CC:	"tiwai@...e.de" <tiwai@...e.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	"linux-mediatek@...ts.infradead.org" 
	<linux-mediatek@...ts.infradead.org>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"Koro Chen (陳思翰)" 
	<koro.chen@...iatek.com>
Subject: 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!