[PATCH 2/9] PM / Domains: Remove dev->driver check for runtime PM

[Geert Uytterhoeven]

Hi Kevin,

On Wed, Aug 12, 2015 at 9:50 PM, Kevin Hilman <khilman at kernel.org> wrote:
> Lina Iyer <lina.iyer at linaro.org> writes:
>
>> Remove check for driver of a device, for runtime PM. Device may be
>> suspended without an explicit driver. This check seems to be vestigial
>> and incorrect in the current context.
>
> This one should probably have been RFC.
>
> For a little more context here, this was uncovered when experimenting
> with using runtime PM for CPU devices which don't have a dev->driver.
>
> This check might have made sense before PM domains, but with PM domains,
> it's entirely possible to have a simple device without a driver and the
> PM domain handles all the necesary PM, so I think this check
> could/should be removed.
>
> Thoughts?

Simple devices without a driver aren't handled automatically.
At minimum, the driver should call pm_runtime_enable(), cfr.
drivers/bus/simple-pm-bus.c.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds