IQS620_PWM_PERIOD_NS
IQS620_PWM_PERIOD_NS, 256);
state->period = IQS620_PWM_PERIOD_NS;
if (state->period < IQS620_PWM_PERIOD_NS)
duty_cycle = min_t(u64, state->duty_cycle, IQS620_PWM_PERIOD_NS);
duty_scale = duty_cycle * 256 / IQS620_PWM_PERIOD_NS;