Need Drivers for Raspberry Pi OS Bullseye Linux 5.15.61 on CM4

Hello,

in this document, the USB driver guide, it is stated that there are available source files etc. Where can I download these files? Is this guide up-to-date for the latest Linux Kernel 5.15.61 on Raspberry Pi OS Bullseye on CM4?

Also, which is recommended: Gobinet or QMI_WWAN?

Thanks,
Felix