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Message-ID: <20121122032407.21126.49680@nucleus>
Date: Wed, 21 Nov 2012 19:24:07 -0800
From: Mike Turquette <mturquette@...com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
Russell King - ARM Linux <linux@....linux.org.uk>
CC: Viresh Kumar <viresh.kumar@...aro.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [PATCH 1/3] CLK: uninline clk_prepare() and clk_unprepare()
Quoting Dmitry Torokhov (2012-11-21 19:11:17)
> On Wed, Nov 21, 2012 at 06:17:50PM -0800, Dmitry Torokhov wrote:
> > On Wed, Nov 21, 2012 at 10:38:59PM +0000, Russell King - ARM Linux wrote:
> > > On Wed, Nov 21, 2012 at 12:54:24PM -0800, Dmitry Torokhov wrote:
> > > > On Wed, Nov 21, 2012 at 12:43:24PM -0800, Mike Turquette wrote:
> > > > > Quoting Viresh Kumar (2012-11-20 02:13:55)
> > > > > > On 20 November 2012 14:52, Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:
> > > > > > > We'll need to invoke clk_unprepare() via a pointer in our devm_*
> > > > > > > conversion so let's uninline the pair.
> > > > > >
> > > > > > Sorry, but you aren't doing this :(
> > > > > > This routine is already uninlined as it is in clk.c
> > > > > >
> > > > > > Instead you are just moving clk_prepare(), etc calls within
> > > > > > #ifdef CONFIG_HAVE_CLK
> > > > > > #else
> > > > > > #endif
> > > > > >
> > > > > > I doubt why they have been added under #ifdef CONFIG_HAVE_CLK_PREPARE
> > > > > > earlier. Can they exist without CONFIG_HAVE_CLK
> > > > > >
> > > > > > @Mike: ?
> > > > > >
> > > > >
> > > > > HAVE_CLK logically wraps HAVE_CLK_PREPARE. There is no point in
> > > > > selecting HAVE_CLK_PREPARE without HAVE_CLK.
> > > > >
> > > > > Looking through the code I see that this used to be the case. Commit
> > > > > 93abe8e "clk: add non CONFIG_HAVE_CLK routines" moved the
> > > > > clk_(un)prepare declarations outside of #ifdef CONFIG_HAVE_CLK. That
> > > > > commit was authored by you. Can you elaborate on why that aspect of the
> > > > > patch was needed?
> > > > >
> > > >
> > > > BTW, it looks like the only place where we select HAVE_CLK_PREPARE is
> > > > IMX platform and it also selects COMMON_CLK so I think HAVE_CLK_PREPARE
> > > > can be removed now.
> > >
> > > 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
> >
> > Thanks.
> >
>
> So how about the one blow?
>
> --
> Dmitry
>
> CLK: get rid of HAVE_CLK_PREPARE
>
> From: Dmitry Torokhov <dmitry.torokhov@...il.com>
>
> HAVE_CLK_PREPARE is automatically selected by COMMON_CLK and the only
> platform that explicitly selects HAVE_CLK_PREPARE is MXS which has been
> switched to common clk framework, so we can delete this option now.
>
> As part of this change we move declarations of clk_prepare() and
> clk_unprepare() under HAVE_CLK and provide stubs if this option is not
> enabled.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Looks right to me. Just need to remove the select from IMX as well.
Regards,
Mike
> ---
> drivers/clk/Kconfig | 4 ---
> include/linux/clk.h | 68 ++++++++++++++++++++++++---------------------------
> 2 files changed, 32 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index bace9e9..639ee9d 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -3,15 +3,11 @@ config CLKDEV_LOOKUP
> bool
> select HAVE_CLK
>
> -config HAVE_CLK_PREPARE
> - bool
> -
> config HAVE_MACH_CLKDEV
> bool
>
> config COMMON_CLK
> bool
> - select HAVE_CLK_PREPARE
> select CLKDEV_LOOKUP
> ---help---
> The common clock framework is a single definition of struct
> diff --git a/include/linux/clk.h b/include/linux/clk.h
> index b3ac22d..f8204c3 100644
> --- a/include/linux/clk.h
> +++ b/include/linux/clk.h
> @@ -84,42 +84,6 @@ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb);
>
> #endif
>
> -/**
> - * clk_prepare - prepare a clock source
> - * @clk: clock source
> - *
> - * This prepares the clock source for use.
> - *
> - * Must not be called from within atomic context.
> - */
> -#ifdef CONFIG_HAVE_CLK_PREPARE
> -int clk_prepare(struct clk *clk);
> -#else
> -static inline int clk_prepare(struct clk *clk)
> -{
> - might_sleep();
> - return 0;
> -}
> -#endif
> -
> -/**
> - * clk_unprepare - undo preparation of a clock source
> - * @clk: clock source
> - *
> - * This undoes a previously prepared clock. The caller must balance
> - * the number of prepare and unprepare calls.
> - *
> - * Must not be called from within atomic context.
> - */
> -#ifdef CONFIG_HAVE_CLK_PREPARE
> -void clk_unprepare(struct clk *clk);
> -#else
> -static inline void clk_unprepare(struct clk *clk)
> -{
> - might_sleep();
> -}
> -#endif
> -
> #ifdef CONFIG_HAVE_CLK
> /**
> * clk_get - lookup and obtain a reference to a clock producer.
> @@ -159,6 +123,27 @@ struct clk *clk_get(struct device *dev, const char *id);
> struct clk *devm_clk_get(struct device *dev, const char *id);
>
> /**
> + * clk_prepare - prepare a clock source
> + * @clk: clock source
> + *
> + * This prepares the clock source for use.
> + *
> + * Must not be called from within atomic context.
> + */
> +int clk_prepare(struct clk *clk);
> +
> +/**
> + * clk_unprepare - undo preparation of a clock source
> + * @clk: clock source
> + *
> + * This undoes a previously prepared clock. The caller must balance
> + * the number of prepare and unprepare calls.
> + *
> + * Must not be called from within atomic context.
> + */
> +void clk_unprepare(struct clk *clk);
> +
> +/**
> * clk_enable - inform the system when the clock source should be running.
> * @clk: clock source
> *
> @@ -292,6 +277,17 @@ static inline void clk_put(struct clk *clk) {}
>
> static inline void devm_clk_put(struct device *dev, struct clk *clk) {}
>
> +static inline int clk_prepare(struct clk *clk)
> +{
> + might_sleep();
> + return 0;
> +}
> +
> +static inline void clk_unprepare(struct clk *clk)
> +{
> + might_sleep();
> +}
> +
> static inline int clk_enable(struct clk *clk)
> {
> return 0;
--
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