[alsa-devel] [PATCH 1/4] ASoC: sn95031: add capture support

[Mark Brown]

On Wed, Jan 19, 2011 at 09:58:11PM +0530, Koul, Vinod wrote:

> > How about using a supply widget for the LDO and the clock?  This would
> > also ensure that...

> Hmmm, so what you are saying is add a supply widget like we have "Headset" and
> which does above. I thought about that, but what I have here is ADC with NULL
> stream (to ensure ADCs are on only when AMICs are selected) and added virtual
> AIF with capture stream, and all TX paths (and thereby DMIC and ADC connected
> to that). If I add supply widgets, then how do I code the map? Should I do
> AIF->TXPATH ->DMIC->Supply ?

A supply widget needs to feed into other widgets.  It will be turned on
before and turned off after the widgets it supplies but won't affect
their power.