[PATCH 1/3] pwm-core: fix compilation when OF is not selected

[Thierry Reding]

* Eric Bénard wrote:
> Le Sun, 29 Apr 2012 19:04:31 +0200,
> Thierry Reding <thierry.reding at avionic-design.de> a écrit :
> 
> > * Eric Bénard wrote:
> > > else we get the following error :
> > > drivers/pwm/core.c: In function 'pwm_get':
> > > drivers/pwm/core.c:538:3: error: implicit declaration of function 'of_pwm_request' [-Werror=implicit-function-declaration]
> > > 
> > > Signed-off-by: Eric Bénard <eric at eukrea.com>
> > 
> > This is solved a little differently in the latest patches. That no longer has
> > the of_pwm_request() function protected by #ifdef CONFIG_OF, but rather calls
> > it in a IS_ENABLED(CONFIG_OF)-protected block so that it will still receive
> > compile coverage in !OF configurations but at the same time will be removed
> > by the compiler's dead code elimination.
> > 
> OK this still doesn't work (using linux-2.6 at :
> f7b006931751f029620ad2f8310ac7a1484fbdb4 ) leads to :
>  CC      drivers/pwm/core.o drivers/pwm/core.c: In function
>  'of_pwm_request': drivers/pwm/core.c:447:3: error: implicit
>  declaration of function
>  'of_property_match_string' [-Werror=implicit-function-declaration]
>  drivers/pwm/core.c:452:2: error: implicit declaration of function
>  'of_parse_phandle_with_args' [-Werror=implicit-function-declaration]
> 
> in include/linux/of.h the declaration of these function is inside
> a #ifdef CONFIG_OF / #endif so I don't see how this can compile.

I've already posted patches to the devicetree-discuss mailing list. I hope
they'll be queued soon.

Thierry
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