LPC18XX_PWM_PRE_SHIFT   38 drivers/pwm/pwm-lpc18xx-sct.c #define LPC18XX_PWM_PRE_MASK		(0xff << LPC18XX_PWM_PRE_SHIFT)
LPC18XX_PWM_PRE_SHIFT   39 drivers/pwm/pwm-lpc18xx-sct.c #define LPC18XX_PWM_PRE(x)		(x << LPC18XX_PWM_PRE_SHIFT)