[alsa-devel] [PATCH 7/8] ASoC: tlv320aic3x: add initial usage of regulator framework to control avdd_dac
broonie at opensource.wolfsonmicro.com
Thu Oct 8 18:01:04 CEST 2009
On 8 Oct 2009, at 16:44, <ext-Eero.Nurkkala at nokia.com> wrote:
> Mark Brown wrote:
>>> Also, this is regulator
>>> is highly platform dependent, not aic3x related really at all, so is
>>> this the correct place... Just a thought, dont take it too
>>> seriously ;)
>> I'm not sure what you mean by this?
> You may power the aic3x from a fixed source, or from multiple
> sources, with
> and without any regulator in between. It's up to the HW and HW design.
The regulator API can cope with all this pretty transparently - if
multiple supplies come from the same regulator the API will hide that
from the consumer. There is a fixed voltage regulator driver which can
be used to represent supplies with no soft control.
> Moreover, you don't _power off_ (turn the regulator off) the analog
> of aic3x; things won't work. So it's not like a switch everybody may
> use. Or
> nothing prevent you from experiencing that...
I'd expect the usage would be that after the audio subsystem has been
idle for some configurable period of time the core would bring the
audio subsystem down to bias off, at which point supplies could also
be switched off.
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