pwm-backlight: Add support for PWM delays proprieties.
Some panels (i.e. N116BGE-L41), in their power sequence specifications, request a delay between set the PWM signal and enable the backlight and between clear the PWM signal and disable the backlight. Add support for the new post-pwm-on-delay-ms and pwm-off-delay-ms proprieties to meet the timings. Signed-off-by: NEnric Balletbo i Serra <enric.balletbo@collabora.com> Acked-by: NPavel Machek <pavel@ucw.cz> Acked-by: NDaniel Thompson <daniel.thompson@linaro.org> Acked-by: NJingoo Han <jingoohan1@gmail.com> Acked-by: NThierry Reding <thierry.reding@gmail.com> Signed-off-by: NLee Jones <lee.jones@linaro.org>
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