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 00:22:37 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Mark Brown <broonie@...nel.org>
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

Hi Mark,

On Tue, Mar 27, 2018 at 08:14:41PM +0800, Mark Brown wrote:
> 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.

Oh nice. So the Droid 4 hardware wiring looks like this (at least
according to my understanding):

+----------+         +-------------+
| 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.

> > "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.

Ok.

-- Sebastian

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