I’ve recently built a new Ryzen based system with a Asus ROG Crosshair VII Hero motherboard.
That motherboard has an ITE IT8665E Super IO, which is not supported by the kernel in-tree driver, and the out-of-tree driver has been abandoned and currently only has minimal support. There is also no publically available PDF datasheet for this IC, although there are references to a document IT8655Ev07.pdf, I’ve not been able to get a copy of this.
Asus however have added a WMI interface to their BIOS/UEFI which gives access to sensor values from the Super IO and EC (Embedded controller)
The source of the driver is available here: Linux Asus WMI sensors driver and I have also made an Arch Linux AUR package for it https://aur.archlinux.org/packages/asus-wmi-sensors-dkms-git