On Wed, May 07, 2025 at 04:09:15PM -0700, Stefano Stabellini wrote: > > This mapping is not for a RAM backed address. In the eDMA case for the > > iMX8QXP the `phys` coming in here is the address of a register. > > Ok, this information is important :-) > > I am not certain whether the map_resource interface can only be called > for MMIO addresses or if it can also be called for RAM-backed addresses > with a size > PAGE_SIZE. In the latter case, we could run into the issue > I was describing.
map_resource is intended for MMIO regions, although those could be > PAGE_SIZE. It must not be called on RAM.
