Re: [PATCH v2] topology: Add topology file for generic HDA DSP machine driver

[Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>]

> +SectionPCMCapabilities."DMIC-Capture" {
> +    formats "S16_LE"
> +    rates "48000"
> +    channels_min "2"
> +    channels_max "2"
> +    sig_bits "16"
> +}

NHLT reports 4 microphones on a number of devices, is there any specific 
reason to limit the capture to 2ch?

I believe the generic Hdaudio card now reports the number of channels to 
pulseaudio, so it's possible that PulseAudio would open a 4ch stream but 
be told sorry no can do by topology.

FWIW we ended-up selecting different topology files in SOF, depending on 
whether we had 0, 2 or 4 mics.