[RFC v2 01/39] Kconfig: introduce HAS_IOPORT option and select it as necessary

[Maciej W. Rozycki]

On Fri, 6 May 2022, Geert Uytterhoeven wrote:

> A loooong time ago,  it was suggested to add register accessor
> functions to struct device, so e.g. readl(dev, offset) would call
> into these accessors, which would implement the bus-specific behavior.
> No more worries about readl(), __raw_readl(), ioread32b(), or whatever
> quirk is needed, at the (small on nowadays' machines) expense of
> some indirection...

 I guess you'd need an additional parameter for the endianness policy 
required (to match either bit or byte lanes, according to ultimate data 
interpretation) where crossing between buses of a different endianness 
each.  Otherwise you'd end up with the mess elsewhere.

  Maciej