pwm_lpss_read
if (pwm_lpss_read(pwm) & PWM_SW_UPDATE) {
ctrl = pwm_lpss_read(pwm);
pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_ENABLE);
pwm_lpss_write(pwm, pwm_lpss_read(pwm) & ~PWM_ENABLE);
ctrl = pwm_lpss_read(pwm);
ctrl = pwm_lpss_read(&chip->pwms[i]);