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

[Michael Riesch]

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

Best regards,
Michael