The cam0_clk and cam1_clk nodes are defined using "fixed-clock", and largely used to provide the relevant information as to the frequency of the external oscillator used on the camera board so that the driver can program the sensor correctly.There are references to cam0_clk and cam1_clk in the device-tree code but no way that I can see to route it to the pins on the csi connectors.
There is currently no actual clock signal provided by the Pi to the sensor - it was tried back on the very original camera, and was an EMC nightmare as you had a 19.2 or 24MHz single ended 3.3V signal flapping around on a cable that had no screening or impedance matching.
https://github.com/raspberrypi/linux/bl ... #L156-L160
https://github.com/raspberrypi/linux/bl ... #L169-L173
Statistics: Posted by 6by9 — Thu Jun 12, 2025 10:12 am