linux-kernel - Re: [PATCH 1/3] CLK: uninline clk_prepare() and clk

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Message-ID: <20121123071931.GB12631@core.coreip.homeip.net>
Date:	Thu, 22 Nov 2012 23:19:31 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Mike Turquette <mturquette@...com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] CLK: uninline clk_prepare() and clk_unprepare()

On Thu, Nov 22, 2012 at 09:30:33AM +0000, Russell King - ARM Linux wrote:
> On Wed, Nov 21, 2012 at 06:17:50PM -0800, Dmitry Torokhov wrote:
> > > You've checked non-ARM architectures too?
> > 
> > Yes:
> > 
> > [dtor@...r-d630 linux-next]$ grep -r HAVE_CLK_PREPARE .
> > ./arch/arm/Kconfig:     select HAVE_CLK_PREPARE
> > Binary file ./.git/objects/pack/pack-7dad5ee164f601f1327dc78648fa317772c2d872.pack matches
> > ./include/linux/clk.h:#ifdef CONFIG_HAVE_CLK_PREPARE
> > ./include/linux/clk.h:#ifdef CONFIG_HAVE_CLK_PREPARE
> > ./drivers/clk/Kconfig:config HAVE_CLK_PREPARE
> > ./drivers/clk/Kconfig:  select HAVE_CLK_PREPARE
> 
> Err, no you haven't, not with that grep.  What you've found are the places
> which enable this, and say "yes, I have clk_prepare".
> 
> What HAVE_CLK_PREPARE is about though is providing a transition path between
> drivers using clk_prepare() to platforms which _don't_ have a clk_prepare()
> implementation - and when it's unset, it provides a default implementation.

Ahh, I see. Then I think my first patch was correct albeit it had bad changelog
message. If provided stubs for clk_prepare()/clk_unprepare() for
platforms that did not define HAVE_CLK and pushed the check for
HAVE_CLK_PREPARE down into drivers/clk/clk.c so __clk_prepare() would
either call platform implementation or just be an empty function.

Am I correct or I am still missing something?

Thanks.

-- 
Dmitry
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