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

From Maxime Ripard <maxime.ripard@free-electrons.com>
Newsgroups linux.kernel
Subject Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply
Date 2015-08-03 11:30 +0200
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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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[PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply Timo Sigurdsson <public_timo.s@silentcreek.de> - 2015-08-02 21:30 +0200
  Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage  for sun7i-a20 to a level all boards can supply Julian Calaby <julian.calaby@gmail.com> - 2015-08-03 01:40 +0200
    Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage  for sun7i-a20 to a level all boards can supply Chen-Yu Tsai <wens@csie.org> - 2015-08-03 04:40 +0200
      Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage  for sun7i-a20 to a level all boards can supply Julian Calaby <julian.calaby@gmail.com> - 2015-08-03 06:30 +0200
        Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage  for sun7i-a20 to a level all boards can supply Chen-Yu Tsai <wens@csie.org> - 2015-08-03 06:30 +0200
        Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply "Timo Sigurdsson" <public_timo.s@silentcreek.de> - 2015-08-03 11:10 +0200
          Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage  for sun7i-a20 to a level all boards can supply Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-08-03 11:40 +0200
            Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage  for sun7i-a20 to a level all boards can supply Julian Calaby <julian.calaby@gmail.com> - 2015-08-03 11:40 +0200
            Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply "Timo Sigurdsson" <public_timo.s@silentcreek.de> - 2015-08-04 11:00 +0200
        Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage  for sun7i-a20 to a level all boards can supply Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-08-03 11:30 +0200
    Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply "Timo Sigurdsson" <public_timo.s@silentcreek.de> - 2015-08-03 10:40 +0200
      Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage  for sun7i-a20 to a level all boards can supply Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-08-03 11:30 +0200
    Re: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage  for sun7i-a20 to a level all boards can supply Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-08-03 11:20 +0200
  Re: [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20  to a level all boards can supply Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-08-03 11:20 +0200
    Re: [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply "Timo Sigurdsson" <public_timo.s@silentcreek.de> - 2015-08-04 10:40 +0200

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