[PATCH 2/3] ARM: dts: r8a7743: Add CMT SoC specific support

[Fabrizio Castro]

Hello Geert,

thank you for your feedback.

> Hi Fabrizio,
>
> On Wed, Dec 13, 2017 at 10:42 AM, Fabrizio Castro
> <fabrizio.castro at bp.renesas.com> wrote:
> >> On Tue, Dec 12, 2017 at 06:49:38PM +0000, Fabrizio Castro wrote:
> >> > Add CMT[01] support to SoC DT.
> >> > Signed-off-by: Fabrizio Castro <fabrizio.castro at bp.renesas.com>
> >> > Reviewed-by: Biju Das <biju.das at bp.renesas.com>
> >> > ---
> >> >  arch/arm/boot/dts/r8a7743.dtsi | 30 ++++++++++++++++++++++++++++++
> >> >  1 file changed, 30 insertions(+)
> >>
> >> I was expecting the cmt nodes to be "disabled" in the SoC file
> >> and then enabled selectively in board files. Am I missing something?
> >
> > Since this component is just a compare and match timer, I  thought there was no harm in enabling it by default in the SoC specific DT.
> > The system will park it and leave its clock disabled until actually needed for something.
> > The user can still disable it in the board specific DT if he/she doesn't mean to even have the option to use it. Do you prefer I left it
> disabled by default?
>
> It's debatable (thus up to Simon the maintainer ;-).
> For I/O devices, we disable them in the SoC .dtsi file.
> For core infrastructure like interrupt, DMA, and GPIO controllers, we keep
> them enabled.
>
> Timers are core functionality, but who's actually using these timers?

I don't have a use case in mind unfortunately, but it's still core functionality and pretty harmless as far as I can tell. Let's see what Simon thinks about this.

Thanks,
Fab

>
> 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


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