Hello Hans and everyone, The I2C V4L2 driver(sensor or lens motor controll chip or whatever) can be registerd with 2 method, I know. 1) using v4l2_i2c_data structure defined in the v4l2-i2c-drv.h 2) not using v4l2_i2c_data, just use i2c_add_driver() like registering method regular i2c driver. But, I don't know the precise difference between upper 2 method. Maybe, I think that there is the clear reason as Hans made it. What's the reason?? If there is any ideas, let me know, plz. Thanks. Regards, HeungJun -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html