On Wed, 2 Mar 2022, Icenowy Zheng wrote: > > The only PCI platforms that actually can't make use of PC-style > > parallel > > port hardware are those newer PCIe systems that have no support for > > I/O > > cycles in the host bridge, required by such parallel ports. Notably, > > this includes the s390 arch, which has port I/O accessors that cause > > compilation warnings (promoted to errors with `-Werror'), and there > > are > > other cases such as the POWER9 PHB4 device, though this one has > > variable > > port I/O accessors that depend on the particular system. Also it is > > not > > clear whether the serial port side of devices enabled by > > PARPORT_SERIAL > > uses port I/O or MMIO. Finally Super I/O solutions are always either > > ISA or platform devices. > > Just spot this patch in linux-riscv mailing list, I think there's a > pending patchset that tries to add a HAS_IOPORT Kconfig option, which > can be used in this situation. Thanks for your input. That has been actually discussed already with a conclusion that more work is required to have HAS_IOPORT supported, see the thread starting from: <https://lore.kernel.org/lkml/CAMuHMdW-utcFzCZTgqONjxs=U662nF0=aBQu7Zi7FBQouwiA3g@xxxxxxxxxxxxxx/>. (there's a reference to the HAS_IOPORT patchset there as well). Once that has been sorted configuration conditions for the parport driver can be updated accordingly. For the time being the !S390 qualification should do. Maciej
