DCU_INT_STATUS
if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
regmap_write(fsl_dev->regmap, DCU_INT_STATUS, ~0);
ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);