Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard

From	Maxime Ripard <maxime.ripard@free-electrons.com>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard
Date	2015-07-24 15:40 +0200
Message-ID	<pPLmG-7cG-13@gated-at.bofh.it> (permalink)
References	(3 earlier) <pPJuz-4vX-33@gated-at.bofh.it> <pPJNV-4T4-13@gated-at.bofh.it> <pPK7g-5uX-5@gated-at.bofh.it> <pPKgV-5Gn-15@gated-at.bofh.it> <pPKJY-6e8-13@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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On Fri, Jul 24, 2015 at 05:49:42AM -0700, Thomas Kaiser wrote:
> Hi,
> 
> Timo wrote:
> >
> > I think what Maxime was trying to say is, that while all of your boards 
> > support Cpufreq, only the Cubietruck supports voltage scaling because only 
> > Cubietruck has the power regulator nodes defined in it's dts file (just 
> > have a look at the last lines of the Cubitruck dts file and compare that to 
> > the dts file, let's say, for Bananapi). On the other boards, the frequency 
> > is scaled, but the voltage always stays at 1.4V as set in U-Boot (that 
> > means the voltages in the cpufreq operating points are not used on these 
> > boards). At least that's what I understand after a recent email axchange 
> > with Chen-Yu Tsai. 
> 
> 
> Ah, now I think I understand. You're talking about these lines here?
> 
>     
> https://github.com/RobertCNelson/u-boot/blob/master/arch/arm/dts/sun7i-a20-cubietruck.dts#L244-L269
> 
> So while using CONFIG_REGULATOR_AXP20X=y will bring working cpufreq
> support to the cubietruck, shouldn't adding these lines to the
> device trees of the other 5 A20 devices enable CPU voltage scaling
> there?

That and
https://github.com/RobertCNelson/u-boot/blob/master/arch/arm/dts/sun7i-a20-cubietruck.dts#L108-L110

Maxime

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

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Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Hans de Goede <hdegoede@redhat.com> - 2015-07-24 12:40 +0200
  Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-07-24 14:00 +0200
    Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-07-24 14:30 +0200
    Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard m.silentcreek@gmail.com - 2015-07-24 14:30 +0200
      Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Hans de Goede <hdegoede@redhat.com> - 2015-07-24 15:40 +0200
        Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Chen-Yu Tsai <wens@csie.org> - 2015-07-25 17:10 +0200
          Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Ian Campbell <ijc@debian.org> - 2015-07-25 17:40 +0200
            Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Chen-Yu Tsai <wens@csie.org> - 2015-07-30 10:00 +0200
              Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Ian Campbell <ijc@debian.org> - 2015-08-01 12:00 +0200
        Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Leonardo Canducci <leonardo.canducci@gmail.com> - 2015-07-25 17:10 +0200
      Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Hans de Goede <hdegoede@redhat.com> - 2015-07-24 15:40 +0200
        Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-07-24 16:10 +0200
      Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-07-24 15:40 +0200
      Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-07-24 15:40 +0200
      Bug#793185: [linux-sunxi] Re: forwarding a bug: cpufreq missing in debian stable on a cuibeboard m.silentcreek@gmail.com - 2015-07-24 16:10 +0200

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