linux-kernel - Re: [RESEND RFC PATCH 1/3] ASoC: mediatek: Add binding support for AFE driver

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Date:	Mon, 4 May 2015 09:57:19 +0800
From:	Koro Chen <koro.chen@...iatek.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Sascha Hauer <s.hauer@...gutronix.de>, <robh+dt@...nel.org>,
	<matthias.bgg@...il.com>, <perex@...ex.cz>, <tiwai@...e.de>,
	<srv_heupstream@...iatek.com>,
	<linux-mediatek@...ts.infradead.org>, <galak@...eaurora.org>,
	<lgirdwood@...il.com>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <alsa-devel@...a-project.org>
Subject: Re: [RESEND RFC PATCH 1/3] ASoC: mediatek: Add binding support for
 AFE driver

On Thu, 2015-04-30 at 21:12 +0100, Mark Brown wrote:
> On Wed, Apr 22, 2015 at 11:17:20AM +0800, Koro Chen wrote:
> 
> > If using DPCM, it seems the most suitable FE DAIs will be memif, and
> > external interface like I2S should be BE DAIs. Do you think it is
> > suitable for our memif to be FE DAIs? Then which memif to used can be
> > described in a machine driver's FE DAIs. But I think this has a problem
> > that our memif is one-direction, playback or capture. So the binded pcm
> > device cannot have playback and capture capability together. May it
> > cause trouble for user space apps that assumes there will be pcmC0D0p,
> > pcmC0D0c?
> 
> I think the only userspace application you really have to worry about
> here is PulseAudio which (at least with UCM) should be able to cope
> since it needs to handle things like USB microphones.  I think
> everything else I can think of can either cope or has to handle the same
> use cases as PulseAudio does so should have support.
Thank you very much for the feedback, I will try DPCM.
  


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