linux-kernel - Re: omap4-droid4: voice call support was Re: [PATCHv5,5/5] ARM: dts: omap4-droid4: add soundcard

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Date:   Tue, 27 Mar 2018 20:14:41 +0800
From:   Mark Brown <broonie@...nel.org>
To:     Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Cc:     Pavel Machek <pavel@....cz>, Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Lee Jones <lee.jones@...aro.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com
Subject: Re: omap4-droid4: voice call support was Re: [PATCHv5,5/5] ARM: dts:
 omap4-droid4: add soundcard

On Mon, Mar 26, 2018 at 05:58:28PM +0200, Sebastian Reichel wrote:

> My understanding is, that we only need to replace the audio-graph-card
> driver to something more complex. The VOICE DAI needs to be configured
> differently based on the use case:

No, this is exactly the sort of use case with multiple DAIs that the
graph card is intended to enable over the old simple-card.

> "audio-graph-card" is not capable of doing this. I was planning to
> try "audio-graph-scu-card" in combination with adding codecs for the
> modem and BT to DT. If that does not work we need a Droid 4 specific
> soundcard driver.

That's just the audio graph card with some hacks for working with a DPCM
based SoC driver set.

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