[PATCH 3/4] soc: rockchip: power-domain: Add regulator support

[Michael Riesch]

On 12/22/21 2:29 PM, Michael Riesch wrote:
> Hi Robin and Mark,
> 
> On 12/22/21 2:25 PM, Mark Brown wrote:
>> On Wed, Dec 22, 2021 at 01:19:23PM +0000, Robin Murphy wrote:
>>> On 2021-12-22 13:00, Mark Brown wrote:
>>
>>>> Does the SoC actually support the supply being completely off in
>>>> operation?  A lot of devices want everything powered even if idle during
>>>> full operation since keeping voltage differentials smaller makes it a
>>>> lot easier to design to avoid leakage current type issues at the points
>>>> where the different power domains connect.
>>
>>> I don't know TBH - the available documentation doesn't seem to go into quite
>>> that much detail.
>>
>> In that case I would tend to assume that unless otherwise stated it's
>> safer to keep the supply enabled when everything else is enabled.  It's
>> the default thing and so is more likely to be what was designed for and
>> less likely to result in nasty surprises.
> 
> Based on my experience with the RK3568 EVB1 the vdd_gpu supply turns

[edit] turns off, of course

Best regards,
Michael

> after startup if it is unused and the SoC works fine. Let's take the
> energy efficient route here :-)
> 
> Best regards,
> Michael
> 
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