pwm_config
retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);