On Wed, Nov 29, 2017 at 03:32:51PM -0600, Andrew F. Davis wrote:
> Leaving microphone bias off is a valid setting and even used in the DT
> binding document example. Add this setting here and document the same.

>  - ai31xx-micbias-vg - MicBias Voltage setting
> +        0 or MICBIAS_OFF - MICBIAS output is powered off
>          1 or MICBIAS_2_0V - MICBIAS output is powered to 2.0V
>          2 or MICBIAS_2_5V - MICBIAS output is powered to 2.5V
>          3 or MICBIAS_AVDD - MICBIAS output is connected to AVDD

This doesn't make much sense.  If we enable the microphone with a
voltage of 0V that's not going to work terribly well - I'd expect this
property to control the voltage set when it's enabled, not if it's
enabled.