PWM_TO_REG
#define PWM_TO_REG(val) (clamp_val(val, 0, 255))
#define PWM_TO_REG(val) (clamp_val((val), 0, 255) >> 4)
#define PWM_TO_REG(val) clamp_val(val, 0, 255)
static inline u8 PWM_TO_REG(int val, int inv)
#define PWM_TO_REG(reg) (((reg) >> 1) & 0x7E)
#define PWM_TO_REG(val) (clamp_val((val), 0, 255))