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

Cross-posted to 2 groups.

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Hi,

On 24-07-15 14:49, 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?

There is slightly more to it then those 5 lines, but yes we should enable
voltage scaling on more boards. This mostly requires someone to simply
just do the work.

I've a workshop on dts this weekend at our localhacker space and the plan
is for the people attending to get some handson experience by them doing
this work (amongst other things)  :)

Regards,

Hans


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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 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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