Function can_by_compatible 

pub fn can_by_compatible(
    compatible: &str,
    ord: usize,
) -> Option<&'static CanRegistryEntry>

compatible matches either the osiris-namespaced osiris,stm32l4-can or the canonical Zephyr st,stm32-bxcan — both refer to the same bxCAN hardware, and the registry stores whichever the DT node declared. Either string accepted on lookup so callers don’t need to know which name the board overlay used.