[alsa-devel] [PATCH V2 2/2] ASoC: Davinci: machine: Add device tree binding

Mark Brown broonie at opensource.wolfsonmicro.com
Wed Jan 23 16:48:12 CET 2013

On Wed, Jan 23, 2013 at 12:39:35PM +0000, Hebbar, Gururaja wrote:
> On Fri, Jan 04, 2013 at 17:56:12, Mark Brown wrote:

> > The CODEC driver biases should be changed over to be supplies, this
> > makes the above much more natural - the routing there is a hack for
> > older versions of ASoc.  Otherwise this looks fine.

> ON TLV320AIC3x Codec, MIC Bias power on/off share the same register bits
> with Bias voltage output.

So you need to use an event to write the actual enable bit.

> SGTL5000 --> Single register for MIC BIAS enable & output impedance of MIC
> Bias. The driver uses SND_SOC_DAPM_POST_PMU & SND_SOC_DAPM_PRE_PMD macro to
> handle the MIC Bias enable & disable event.

This is the way these things should be handled.
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