pwm: Constify PWM device where possible

The PWM argument is not modified in PWM property accessors, make it a
const argument so that the accessors can be used from sysfs.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Boris Brezillon 2015-07-01 10:21:48 +02:00 • committed by Thierry Reding
commit a1cf42171a