Re: [PATCH 1/5] cpufreq: loongson3: Make this drvier depend on MACH_LOONGSON64

[Huacai Chen]

Hi, Zhongqiu,

On Thu, Aug 20, 2026 at 5:23 PM Zhongqiu Han
<zhongqiu.han@xxxxxxxxxxxxxxxx> wrote:
>
> Hello Huacai,
> Just share a few inline comments/questions below:
>
> On 8/18/2026 8:39 PM, Huacai Chen wrote:
> > 32BIT Loongson machines don't have SMC and FreqCtrl registers, so make
> > this drvier depend on MACH_LOONGSON64.
>
> Typo --> driver? Likewise the subject.
Yes, thank you very much.

>
> >
> > Cc: stable@xxxxxxxxxxxxxxx
>
> Nit, it is better to add fixes tag?  For example:
>
> ccf51454145b ("cpufreq: Add Loongson-3 CPUFreq driver support")
OK, I will add it.

>
> > Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
> > ---
> >   drivers/cpufreq/Kconfig | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
> > index db83f3365698..edc1299098d4 100644
> > --- a/drivers/cpufreq/Kconfig
> > +++ b/drivers/cpufreq/Kconfig
> > @@ -288,6 +288,7 @@ endif
> >   if LOONGARCH
> >   config LOONGSON3_CPUFREQ
> >       tristate "Loongson3 CPUFreq Driver"
> > +     depends on MACH_LOONGSON64
>
> Small nit:
>
> Please feel free to correct me.
>
> There are two MACH_LOONGSON64 symbols in the tree:
>    arch/loongarch/Kconfig: config MACH_LOONGSON64
>                                   def_bool 64BIT
>
>    arch/mips/Kconfig:      config MACH_LOONGSON64
>                                   bool "Loongson 64-bit family of
>                                   machines"
>                                   select ...
>
> The one that actually applies here is the LoongArch one, i.e. this is
> really just "depends on 64BIT".  Since drivers/cpufreq/Kconfig is a
> shared file that also contains an "if MIPS" block, please at least
> is it better to mention it in the changelog which MACH_LOONGSON64 is
> using, because the LoongArch one has no prompt and is therefore
> invisible in menuconfig. Or just write "depends on 64BIT"?
Hmmm, in theory MIPS-based Loongson3 can also use this driver, because
it also has SMC and FreqCtrl registers. But we haven't tested MIPS.

Anyway, I will improve the commit message, but keep the code as is.


>
>
> >       help
> >         This option adds a CPUFreq driver for Loongson processors which
> >         support software configurable cpu frequency.
>
>
> --
> Thx and BRs,
> Zhongqiu Han