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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org 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 > > _______________________________________________ > Linux-rockchip mailing list > Linux-rockchip@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-rockchip > _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip