Generally uio_dmem_genirq.c builds on top of uio.c, which provides a common module basis for isolating code common to the other specific modules. But for a specific purpose, uio_dmem_genirq.c has be either customized or extended in order that specific memory regions can be set as accessible. Most easily, this is done in a first come first serve approach by filling out the details (which exactly?) left missing in uio_dmem_genirq.c, and to start, that would be in uio_of_genirq_match.

Am I correct?