[alsa-devel] [PATCH v3 2/8] ASoC: da7210: Add support for DAPM

Ashish Chavan ashish.chavan at kpitcummins.com
Thu Oct 20 13:47:45 CEST 2011

On Wed, 2011-10-19 at 13:13 +0100, Mark Brown wrote:
> On Wed, Oct 19, 2011 at 12:51:35PM +0530, Ashish Chavan wrote:
> > BTW if in case, hardware designers reiterate to use STANDBY registers,
> > will it suffice to only document this somewhere is the source?
> The main thing is to make sure that the code is understandable and
> doesn't look buggy to visual inspection so yes, if there's adequate
> documentation that would be OK.

I see.

BTW today I received response from hardware designers and as expected,
they are recommending usage of STANDBY registers instead of
ENABLE/DISABLE registers. The main reason for this is that STANDBY
registers are part of system controller which allows system power
up/down in a controlled, pop free manner. Also, as per application note,
STANDBY register bits are only effective if a particular IO (or ADC/DAC)
is already enabled using enable/disable register bits. This is inline
with my previous patch to support DAPM, i.e.

- All IOs and ADC/DAC are enabled using enable/disable register bits in
- STANDBY mode of all IOs and ADC/DAC is controlled by DAPM

I am thinking of re-posting the patch after adding above info somewhere.

Is there anything else that I need to take care of?

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