lkml.org 
[lkml]   [2012]   [Nov]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [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@dtor-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.
>
> So, finding all those places where the symbol exists is the exact opposite
> of what you need to be doing. You need to find those platforms which have
> CLK support, but which don't have HAVE_CLK_PREPARE selected.

Right, according to my greps under arch/arm, the following define a
clk_enable() function but do not define a clk_prepare() function:

arch/arm/mach-w90x900/clock.c
arch/arm/mach-ep93xx/clock.c
arch/arm/plat-omap/clock.c
arch/arm/plat-samsung/clock.c
arch/arm/mach-lpc32xx/clock.c
arch/arm/mach-msm/clock.c
arch/arm/mach-mmp/clock.c
arch/arm/mach-sa1100/clock.c
arch/arm/mach-at91/clock.c
arch/arm/mach-at91/at91x40.c
arch/arm/mach-pxa/clock.c
arch/arm/plat-versatile/clock.c
arch/arm/mach-davinci/clock.c

This list gets over twice as big if you widen the search to the arch/
subtree.

If any of these makes use of a driver which makes a call to clk_prepare(),
removing HAVE_CLK_PREPARE will break all those platforms.


\
 
 \ /
  Last update: 2012-11-25 05:01    [W:0.137 / U:1.000 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site