linux-kernel - Re: [PATCH v2 12/14] drivers: sh: Stop using pm_runtime.c for multi-platform shmobile with genpd

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Date:	Mon, 15 Jun 2015 21:44:47 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Geert Uytterhoeven <geert+renesas@...der.be>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Kevin Hilman <khilman@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-clk@...r.kernel.org,
	Linux PM list <linux-pm@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 12/14] drivers: sh: Stop using pm_runtime.c for
 multi-platform shmobile with genpd

On Thu, May 28, 2015 at 8:53 PM, Geert Uytterhoeven
<geert+renesas@...der.be> wrote:
> Now most multi-platform ARM shmobile platforms (SH-Mobile, R-Mobile,
> R-Car, RZ) use the CPG Clock Domain to take care of PM runtime
> management of the module clocks, we no longer need the legacy default PM
> domain hack, which also prevented registering the real PM domain.
>
> EMMA Mobile EV2 doesn't have MSTP clocks and doesn't use the CPG Clock
> Domain. But all its device drivers manage clocks explicitly, without
> relying on Runtime PM, so it doesn't need the legacy default PM hack
> neither.
>
> Hence do not compile it when running an ARM multi-platform kernel with
> genpd support.
>
> The default PM domain is still needed:
>   - for legacy SuperH,
>   - for legacy (non-DT) ARM/shmobile platforms
>       - without genpd support (r8a7778, r8a7779),
>       - with genpd support, for devices in the "C5" always-on power
>         area (r8a7740, sh73a0),
>   - for the CONFIG_PM=n case.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
> v2:
>   - Add Reviewed-by,
>   - Just stop compiling pm_runtime.c instead of using a runtime check,
>     as no multi-platform ARM platforms need this anymore.

The runtime check must stay for the ARM multiplatform CONFIG_PM=n case,
to prevent the code from running on non-shmobile machines. Will fix.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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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