I hope it is OK to comment here instead of opening a new question.
Well, its one thread one topic. I’d think your questions would have merited a new thread.
If the purpose is to add a camera (ether analog or CSI) to the Colibri series CSI interface, is an external chip such as ADV7280 still the best way to go? Any updates on new chips you have tested?
Using the term CSI is ambigous. Freescale for long used this 3 letter abbreviation for Camera Sensor Interface, a generic term for any interface. On the Colibri iMX6 you can only connect to the parallel camera interface.
The MIPI Alliance decided to use CSI for their camera serial interface specification, nowadays you find this often spelled as ‘MIPI CSI2’.
The ADV7280 chip is a video ADC which converts from analogue video formats to a digital video stream. The flavour we use on our ‘Analogue Camera Adapter’ provides parallel video data.
We did not test / implement any new video ADC. ADV7280/ADV7281 and MAX9526 are the only drivers in the Linux kernel which we tested to digitize analogue camera signals.
If your video stream is already available in compatible digital format the chips mentioned above are of no use to you. However you likely need some sort of driver in the kernel which talks to e.g. your camera to coordinate the camera with the parallel CSI receiving part.