device-tree mismatch: .probe never called

There are a number of possible ways this might happen, and most of them are well away from the driver code itself. Firstly, a .dtsi fragment alone doesn't tell the whole story - the device tree syntax is hierarchical, so the properties (in particular the status) might still be overridden by the board-level .dts which includes a basic SoC .dtsi file. Secondly, the compiled DTB isn't the last word either, since the bootloader may dynamically modify it before passing it to the kernel - this is typically done for memory nodes and SMP enable methods, but could potentially affect anything.

This kind of debugging is often best tackled in reverse, by examining the state of the booted system, then working backwards to figure out how things got that way - the specifics of this particular question rule some of this out already, but for the sake of completeness:

• If the kernel knows about the driver, and it's loaded and properly initialised, it should show up somewhere in /sys/bus/*/drivers/ - otherwise, it may be in a module which needs loading, or it may have failed to initialise due to some unmet dependency on some other driver or resource.
• If the kernel knows about the device, it should show up somewhere in /sys/bus/*/devices/, and if it's correctly bound to a driver and probed then they should both have a symlink to each other.
• If the device is nowhere to be found, then on a DT-based system the next place to check would be /proc/device-tree/ (dependent on CONFIG_PROC_DEVICETREE on older kernels, and canonically found in /sys/firmware/devicetree/base/ on newer ones) - this will show the view of the DT as the kernel found it, and a bit of poking around there should hopefully make clear any missing nodes or out-of-place properties, such as a disabled node causing the kernel to skip creating a device altogether. Beware that the property files themselves are just the raw data - so you probably want to go snooping with hexdump rather than cat - and that all numeric cells are in big-endian byte order.