Is there a reference manual or programming guide for ADV7482 for driver development under Linux.
Depends on what exactly you mean by that. The ADV7482 is a video chip, so naturally a driver for it would be implemented in the Video4Linux framework. Programming details for the ADV7482 can be found in the ADV7482 Design Support Files.
Quick research finds that this experimental driver exists.
I also have a requirement to support ADV7482 chip on Linux. Then, I found the latest driver is v7 on patchwork ([v7,1/3] media: adv748x: Add adv7481, adv7482 bindings - Patchwork) and keep developing it. Then, some functions like interrupt handler for HDMI cable or format detection have yet to implement. Do you know when these functions will be completed or schedule for driver completed?
This driver is not developed by us, so I can't comment on schedule or targeted feature set, sorry for that. You could try to contact the developer of the driver and ask them what their plan is.
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