On Waveshare-io-base-b, cam0 mipi csi pins SDA, SCL and PWDN pins are connected to Pins 80, 82 and 97 of CM4 socket. But BPiCM4 cm4 header pinout says:
80 GPIOH_7 General purpose input/output bank H signal 7.Typically a 3.3V signal.
82 GPIOH_6 General purpose input/output bank H signal 6.Typically a 3.3V signal.
97 NC No connection pin.
are 80 and 82 connected to i2c0? is it ok to leave PWDN floating? I believe imx219 driver resets the imx219 to initiate by setting pwdn(active_low).