STATUS_CTRL_UPDATE
vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);
vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);
vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);
vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);