IMX519 Driver Installation

Hi guys,
In the repository of the “Arducam-Pivariety-V4L2-Driver” I read that it has merged into the rpi kernel.
Meanwhile, the readme directs me to the ArduCAM/IMX519_AK7375) repository which says:

“However, the driver of the motor driver (AK7371/AK7375) on IMX519 needs to be updated, and the device tree of IMX519 also needs to be updated.”

How can I update the motor driver and the device tree?