Develop camera driver on AGX Xavier platform with V4L2 Kernel Driver (Version 1.0)

There are two versions of V4L2 Kernel Driver in the Sensor Software Driver Programming Guide document, can they both be used to develop new camera drivers? Or must be V2.0 ?
I currently have the camera driver of version R28.2.1, which is based on V4L2 Kernel Driver version 1. Is it possible to slightly change it for use in 32.4.3? It would be great if so … However, NVIDIA recommends to use V4L2 Kernel Driver version 2 in the future,is that true?

Suggest to use V2.0 for compatibility in future.