On Wed, Dec 22, 2021 at 02:29:23PM +0100, Michael Riesch wrote:

On 12/22/21 2:25 PM, Mark Brown wrote:

quoted

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 :-)

One of the issues is that it may not actually be energy efficient if it
ends up leaking current through the SoC from the other supplies (and
long term that leakage probably won't do any good for hardware).  A very
lightly loaded regulator can be the better option.