Check if external WR clock input option is still useful
This may be a silly comment and please ignore it if this is the case: do we still need this U.FL input for testing purposes?
I can understand the flexibility it brings for testing, on the other hand the final circuit will always count on an onboard oscillator, right? It looks like overkill, but I might be absolutely wrong. I just try to stick to the idea of simplifying the board and removing extremely rarely used configurations.
If testing is really crucial for the WR clock source, maybe it could make sense to replace the external clock input + FIN by a simple clock output (Si57X_CLK_P and Si57X_CLK_N) on U.FL connectors?