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SubjectRe: 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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