request_mem_region() compulsory or advisory?

Hi,

I'm trying to write a simple driver using some registers of my hardware.

Is a call to request_mem_region() advisory ("recommended") or
compulsory before I ioremap the memory?

In other words, if I don't use request_mem_region() before I start
using the memory; is my driver BOUND to fail, or it MAY fail?

Thanks,

Rick

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