Hi @rkathar!
Since you are working with a very customized setup (custom carrier board using a different bridge than we use for Verdin iMX8M Plus), our support is limited, as we don’t have the hardware needed to test or validate it. Even the software part (device tree, overlays, etc.) can’t be tested without the right hardware.
That being said, I can only give you a probable starting point.
First, as I said before, we don’t recommend making modifications directly on the device tree. Use the device tree overlays instead. Besides that, I’m not familiar with this error that you sent, but I would recommend taking a look at our device tree file for ADV7535 on Verdin iMX95. It implements the same bridge as you, and maybe you could find useful information in there. Another, and probably the most difficult, idea is to read the code of the driver (probably imx_sec_dsim_drv) that is giving the error and try to debug it to find the root cause of the issue.
These are the steps that we take whenever we try to debug an issue like this. If you think this could delay your project, we recommend searching in our Partner Network, where you will find partners who could accelerate this debug and/or the development of the project.
Best regards.