Based on https://github.com/sunny0917/ar0521
Targets kernel version 5.10.92
The ar0521-decompiled.dts is the result of using dtc on PiOS to convert the buildroot-built dtb into a dts file.
helpful link for checking where methods exist in the kernel:
https://elixir.bootlin.com/linux/v5.10.92/source/include/media/v4l2-subdev.h#L413