Re: Changing SiFive Unleashed core clock rate on 5.x kernel

[Carlos Eduardo de Paula <me@carlosedp.com>]

Got it, just to be clear, the sysfs changes only work on this 5.3 tree
and patches right? Not on my current 5.2-rc7.

Thanks!

On Tue, Aug 13, 2019 at 11:09 PM Paul Walmsley <paul.walmsley@sifive.com> wrote:
>
> On Tue, 13 Aug 2019, Paul Walmsley wrote:
>
> > On Mon, 12 Aug 2019, Carlos Eduardo de Paula wrote:
> >
> > > Now with Kernel 5.x and with the board DTB, what's the correct way to
> > > set this clock rate?
> >
> > There are some experimental patches here:
> >
> > https://github.com/sifive/riscv-linux/tree/dev/paulw/cpufreq-dt-aloe-v5.3-rc4
> >
> > Only the userspace governor is enabled - for one-off, manual frequency
> > changes, like the one you mentioned above.
>
> By the way, the command lines to change this would be the usual CPUFreq
> sysfs changes.  Something like this:
>
> echo userspace > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
> echo 1400000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_setspeed
>
>
> - Paul



-- 
________________________________________
Carlos Eduardo de Paula
me@carlosedp.com
http://carlosedp.com
http://twitter.com/carlosedp
Linkedin
________________________________________

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv