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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