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

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Date:   Wed, 28 Mar 2018 10:29:10 +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 Wed, Mar 28, 2018 at 12:22:37AM +0200, Sebastian Reichel wrote:
> On Tue, Mar 27, 2018 at 08:14:41PM +0800, Mark Brown wrote:

> > 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.

> +----------+         +-------------+
> | OMAP4    |         | CPCAP       |
> |          |         |             |
> | [McBSP2] | <-----> | [HiFi DAI]  |
> |          |         |             |
> | [McBSP3] | <--+--> | [Voice DAI] |
> |          |    |    |             |
> +----------+    |    +-------------+
>                 |
> +----------+    |    +-------------+
> | MDM6600  |    |    | WL1285      |
> |          |    |    |             |
> |    [DAI] | <--+--> | [DAI]       |
> |          |         |             |
> +----------+         +-------------+

> Legend:
>     OMAP4   = SoC running Linux
>     CPCAP   = Audio codec
>     MDM6600 = Baseband
>     WL1285  = Bluetooth

> Re-reading the audio-graph-card binding document I still don't see
> how the network (OMAP.McBSP3, CPCAP.Voice, MDM6600, WL1285) is
> supposed to look like. It seems to expect point-to-point DAI
> connections.

Ugh, a TDM mux?  That's really unusual and not particularly supported
yet, you'd need to extend the graph card to do it.  It's where things
should end up for a generic card though.

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