Re: [GIT PULL 1/2] asm-generic: rework PCI I/O space access

[John Garry]

On 20/12/2021 09:27, Niklas Schnelle wrote:
> >   > My feeling is that in this case we want some other dependency, e.g. a
> >   > new CONFIG_LPC. It should actually be possible to use this driver on
> >   > any machine with an LPC bus, which would by definition be the primary
> >   > I/O space, so it should be possible to load it on Arm64.
> >
> > You did suggest HARDCODED_IOPORT earlier in this thread, and the
> > definition/premise there seemed sensible to me.
> >
> > Anyway it seems practical to make all these changes in a single series,
> > so need a way forward as Niklas has no such changes for this additional
> > kconfig option.
> >
> > As a start, may I suggest we at least have Niklas' patch committed to a
> > dev branch based on -next or latest mainline release for further analysis?
> >
> > Thanks,
> > John
> My plan would be to split the patch up into more manageable pieces as
> suggested by Arnd plus of course fixes like the missing ARM select. As
> Arnd suggested I'll split the HAS_IOPORT additions into the initial
> introduction plus arch selects and then the HAS_IOPORT dependencies per
> subsytem. I think these per subsystem dependency patches then would be
> a great place to find drivers which should have a different dependency
> be it on LPC or a newly introduced HARDCODED_IOPORT. The thing is we
> can find and check HAS_IOPORT dependencies easily but it's hard to find
> HARDCODED_IOPORT so I think the lattter should be a refinement of the
> former. It can of course still go in as a single series. I'll
> definitely make the next iteration available as a git branch.

I'll do an audit for what would require HARDCODED_IOPORT to understand 
the scope while you can continue the work on your current path.

Thanks,
john