PWM_PERIOD_BIT_WIDTH   25 drivers/pwm/pwm-mtk-disp.c #define PWM_PERIOD_MASK		((1 << PWM_PERIOD_BIT_WIDTH) - 1)
PWM_PERIOD_BIT_WIDTH   89 drivers/pwm/pwm-mtk-disp.c 			  PWM_PERIOD_BIT_WIDTH;