[PATCH 3/5] arm64: dts: renesas: r8a7795: Add cpu capacity-dmips-mhz

[Gaku Inami]

Hi Geert-san, Simon-san,

> -----Original Message-----
> From: linux-renesas-soc-owner at vger.kernel.org [mailto:linux-renesas-soc-owner at vger.kernel.org] On Behalf Of Simon
> Horman
> Sent: Wednesday, March 7, 2018 5:11 PM
[snip]
> >
> > Documentation/devicetree/bindings/arm/cpu-capacity.txt:
> >
> > "capacity-dmips-mhz is an optional cpu node [1] property: u32 value
> >  representing CPU capacity expressed in normalized DMIPS/MHz. At boot time, the
> >  maximum frequency available to the cpu is then used to calculate the capacity
> >  value internally used by the kernel."
> >
> > IIUIC, you should thus not use 15532585 and 6241541 directly, but
> > scale them to the frequency.
> >
> > So the formula for CA53 becomes:
> >
> > 1024 / (15532585 / 1500) * (6241541 / 1200) = 514
> >
> > > Considering cpufreq is available later, is it better to set the value(514)
> > > for CA53 scaled by different maximum frequencies?
> >
> > DT describes the hardware, not software limitations, so IMHO 514 is the correct
> > value.

Sorry, I misunderstood the intention of definition in DT.
Thanks for your detailed explanation. I understood it.

> Yes agreed. Please refresh this patchset accordingly.

I will update v2 patch.

Regards,
Inami