[Sound-open-firmware] about SOF 1.2 topology support

[Liam Girdwood]

On Mon, 2018-05-21 at 09:15 -0700, Ranjani Sridharan wrote:
> > > 5. Add a kcontrol for each SSP BE to switch loopback on/off, for
> > > test 
> > > purpose.
> 
> I'm not sure there's support for adding kcontrols to BE link widgets in
> alsa topology atm. You might want to check that.

I think the intention here is to add an associated kcontrol (not in any audio
path/graph) for each SSP. The DAI FW driver will need to register a cmd()
callback to support this and maybe a bespoke topology tuple will need to be used
to bind the kcontrol to the SSP port.

Liam