pwm-backlight: retrieve configured PWM period
The PWM core is now able to initialize the PWM period from a lookup table defined by board files. Use it if available and fallback to the value supplied in pwm_period_ns. Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: NThierry Reding <thierry.reding@gmail.com>
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