linux-kernel - RE: [EXT] Re: [PATCH 2/2] cpufreq: dt-platdev: Support building cpufreq platdev driver as module

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Date:   Wed, 30 Aug 2023 03:09:03 +0000
From:   Zhipeng Wang <zhipeng.wang_1@....com>
To:     Aurelien Jarno <aurelien@...el32.net>
CC:     "rafael@...nel.org" <rafael@...nel.org>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH 2/2] cpufreq: dt-platdev: Support building
 cpufreq platdev driver as module

Hi Aurelien,

I'm not sure why we need to make cpufreq-dt-platdev autoloading, does it make sense? As I understand it we need to actively modprobe cpufreq-dt-platdev, why not?



BRs,
Zhipeng



> -----Original Message-----
> From: Aurelien Jarno <aurelien@...el32.net>
> Sent: 2023年8月30日 2:01
> To: Zhipeng Wang <zhipeng.wang_1@....com>
> Cc: rafael@...nel.org; viresh.kumar@...aro.org; linux-pm@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Subject: [EXT] Re: [PATCH 2/2] cpufreq: dt-platdev: Support building cpufreq
> platdev driver as module
> 
> Caution: This is an external email. Please take care when clicking links or opening
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> 
> 
> Hi,
> 
> On 2023-05-24 15:34, Zhipeng Wang wrote:
> > Make the cpufreq platdev driver as tristate so that it can be built as
> > loadable module.
> >
> > Signed-off-by: Zhipeng Wang <zhipeng.wang_1@....com>
> > ---
> >  drivers/cpufreq/Kconfig | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig index
> > 2c839bd2b051..dda3a78bfd5c 100644
> > --- a/drivers/cpufreq/Kconfig
> > +++ b/drivers/cpufreq/Kconfig
> > @@ -218,7 +218,7 @@ config CPUFREQ_DT
> >         If in doubt, say N.
> >
> >  config CPUFREQ_DT_PLATDEV
> > -     bool
> > +     tristate "Generic DT based cpufreq platdev driver"
> >       help
> >         This adds a generic DT based cpufreq platdev driver for frequency
> >         management.  This creates a 'cpufreq-dt' platform device, on
> > the
> 
> It seems that this new module is missing support for autoloading, causing issues
> with CPUFREQ_DT=m.
> 
> Before that change, CPUFREQ_DT_PLATDEV ended up selected as =y. Now,
> CPUFREQ_DT_PLATDEV ends up selected as =m. As it is not autoloaded, it means
> that cpufreq-dt is not working anymore unless manually running "modprobe
> cpufreq-dt-platdev".
> 
> Could you therefore please add support for autoloading?
> 
> Thanks,
> Aurelien
> 
> --
> Aurelien Jarno                          GPG: 4096R/1DDD8C9B
> aurelien@...el32.net
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