On Thu, Jul 02, 2020 at 09:11:47AM -0300, Jason Gunthorpe wrote:
> On Thu, Jul 02, 2020 at 12:15:22PM +0100, Mark Brown wrote:

> > These are very much physical devices often with distinct IPs in distinct
> > address ranges and so on, it's just that those addresses happen not to
> > be on buses it is sensible to memory map.

> But platform bus is all about memmory mapping, so how does the
> subdevice learn the address range and properly share the underlying
> transport?

Hard coding, some out of band mechanism or using an unparented register
region (the resource the code is fine, it's not going to actually look
at the registers described).