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

[Thierry Reding]

* 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.

Thierry
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