@mattyg I’m not sure if you saw this in the “RPI3 bullseye libcamera” thread, but @rahul-thakoor got the libcamera stack working.
For me, it is working on a raspberry pi zero 2 with an OV5647 (rpi v1) camera but not with an imx219 (rpi v2.1) yet. I am going to keep trying different dtoverlay configs.