Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply

[Maxime Ripard]

On Mon, Aug 03, 2015 at 02:22:13PM +1000, Julian Calaby wrote:
> >> Is the code that uses this smart enough to sensibly switch between two
> >> operating points with the same frequency and different voltages? If
> >> so, maybe just add a 144MHz @ 1.0v operating point?
> >
> > You could try. Though I really don't see much to gain here.
> 
> From what I recall, lower frequency = less power usage, though my
> experience is from x86 laptops, not ARM SoCs and I'm sure I'm missing
> a lot of details. This is the sort of thing that requires thorough
> testing on a dev board.

Not on *a* dev board. On virtually all the A20 SoCs ever produced. If
you have a setting that works better for *your* SoC, fine, patch your
DT, but that's not going to be a default if it's outside of the SoC
operating range.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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