RE: [PATCH 1/4] firmware: arm_scmi: bus: Bypass setting fwnode for scmi cpufreq

Peng Fan
2025-03-10T11:10:40Z

> Subject: Re: [PATCH 1/4] firmware: arm_scmi: bus: Bypass setting
> fwnode for scmi cpufreq
>
> On Thu, Feb 20, 2025 at 08:59:18AM +0800, Peng Fan wrote:
> >
> > Sorry, if I misunderstood.
> >
> > I will give a look on this and propose a RFC.
> >
> > DT maintainers may ask for a patchset including binding change and
> > driver changes to get a whole view on the compatible stuff.
> >
> > BTW, Cristian, Saravana if you have any objections/ideas or would
> take
> > on this effort, please let me know.
> >
>
> Can you point me to the DTS with which you are seeing this issue ?
> I am trying to reproduce the issue but so far not successful. I did move
> to power-domains for CPUFreq on Juno. IIUC all we need is both
> cpufreq and performance genpd drivers in the kernel and then GPU
> using perf genpd fails with probe deferral right ? I need pointers to
> reproduce the issue so that I can check if what I have cooked up as a
> solution really works.

This is in downstream tree:
https://github.com/nxp-imx/linux-imx/blob/lf-6.6.y/arch/arm64/boot/dts/freescale/imx95.dtsi#L2971
https://github.com/nxp-imx/linux-imx/blob/lf-6.6.y/arch/arm64/boot/dts/freescale/imx95.dtsi#L3043
https://github.com/nxp-imx/linux-imx/blob/lf-6.6.y/arch/arm64/boot/dts/freescale/imx95.dtsi#L80

we are using "power-domains" property for cpu perf and gpu/vpu perf.

If cpufreq.off=1 is set in bootargs, the vpu/gpu driver will defer probe.

Regards,
Peng.

>
> --
> Regards,
> Sudeep