Choose best prescaler to improve PWM resolution. Without this change
driver chooses first prescaler that gives us period value within
range, but it could be not the best one.
Signed-off-by: NVasily Khoruzhick <anarsoul@gmail.com>
Tested-by: NVagrant Cascadian <vagrant@debian.org>
Acked-by: NMaxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: NJagan Teki <jagan@openedev.com>