Re: [PATCH] ARM: multi_v7_defconfig: switch CONFIG_PWM_MESON to built-in

[Martin Blumenstingl]

Hi Kevin,

On Thu, Nov 29, 2018 at 1:30 AM Kevin Hilman <khilman@xxxxxxxxxxxx> wrote:
>
> Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> writes:
>
> > Some Meson8b boards (Odroid-C1, EC-100) use a PWM regulator which is the
> > voltage supply of the CPU cores (this regulator is typically called
> > "VCCK").
> > Now that we are preparing support for CPU frequency scaling on Meson8,
> > Meson8b and Meson8m2 we should build the pwm-meson driver into the
> > kernel so we can configure the CPU voltage early in the boot process.
>
> Can you explain a little more why the configuration of CPU voltage
> cannot wait a bit so this could be properly probed?
I was under the impression that cpufreq-dt would still initialize even
if the regulator is not ready yet. however (after reading the code
again) this is clearly NOT the case.

there's still a benefit with this change: your Odroid-C1 in your
KernelCI lab would also be able to change the CPU frequency (so in
case something breaks we could spot it there).
will you accept this patch after I updated the description to mention
that it's for KernelCI test coverage?


Regards
Martin