linux-kernel - Re: [PATCH/RFC 3/4] of/clk: Register clocks suitable for Runtime PM with the PM core

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Message-ID: <CAPDyKFoSOUfgvrKE8x3dih7xvm3VBoNZHjPxWCtFw_h-QALqvw@mail.gmail.com>
Date:	Tue, 6 May 2014 09:43:30 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Simon Horman <horms@...ge.net.au>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Felipe Balbi <balbi@...com>,
	Mike Turquette <mturquette@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-omap <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH/RFC 3/4] of/clk: Register clocks suitable for Runtime PM
 with the PM core

On 2 May 2014 16:35, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> Hi Ulf,
>
> On Fri, May 2, 2014 at 10:56 AM, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>>> +static int of_clk_pm_runtime_suspend(struct device *dev)
>>> +{
>>> +       int ret;
>>> +
>>> +       ret = pm_generic_runtime_suspend(dev);
>>> +       if (ret)
>>> +               return ret;
>>> +
>>> +       ret = pm_clk_suspend(dev);
>>
>> What about slow clocks? Those aren't handled with pm_clk_suspend().
>
> How are slow clocks handled?

clk_prepare|unprepare - these functions may sleep.

Kind regards
Ulf Hansson

>
> 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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