Re: [PATCH v9 0/3] Tango PCIe controller support
From: Bjorn Helgaas
Date: Wed Jul 05 2017 - 17:34:28 EST
On Wed, Jul 05, 2017 at 10:39:19PM +0200, Mason wrote:
> On 05/07/2017 20:03, Bjorn Helgaas wrote:
> > On Wed, Jul 05, 2017 at 12:55:37AM +0200, Mason wrote:
> >> On 04/07/2017 22:24, Bjorn Helgaas wrote:
> >>> I made the trivial changes I mentioned, added a dependency on
> >>> CONFIG_BROKEN (for the config/MMIO muxing issue), and put these on
> >>> pci/host-tango. I can't build or test this, so I probably broke
> >>> something in the process. I think the combination of the boot-time
> >>> warning, the taint, and CONFIG_BROKEN is a reasonable amount of
> >>> warning that a user should expect issues.
> >>> Can you take a look and see if it works for you?
> >>> https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/log/?h=pci/host-tango
> >> Thanks. I'll take it for a spin ASAP.
> >> TAINT_CRAP... Smirk. I didn't see that one in the docs:
> >> https://www.kernel.org/doc/html/latest/admin-guide/tainted-kernels.html
> >> Oh wait... TAINT_CRAP is "C" => a staging driver has been loaded
> > I wish it had a less pejorative, more descriptive name. But it seems like
> > the closest to this situation.
> Maybe it is not too late to submit a patch to Linus
> renaming TAINT_CRAP?
> Here are a few candidates, off the top of my head:
I personally wouldn't object, but it's not a PCI thing so that can all
be separate from this driver.
> >> The one issue I anticipate with "depends on BROKEN" is
> >> when I add support for revision 2, which isn't broken.
> > How about this:
> > - Rename PCIE_TANGO to PCIE_TANGO_REV1
> > - PCIE_TANGO_REV1 depends on BROKEN
> > - Add rev2 support later, enabled by PCIE_TANGO
> > - PCIE_TANGO_REV1 depends on PCIE_TANGO && BROKEN
> > I updated pci/host-tango along these lines (without rev2 support,
> > obviously).
> And support for REV1 wouldn't be compiled in, unless
> BROKEN is selected? Yes, I think that could fly.
> Don't you think the naming should follow the DT
> convention of using the first SoC embedding the
> IP (for the compatible string) ?
> PCIE_TANGO_REV1 vs PCIE_TANGO_SMP8759
Sounds reasonable. So v2 will be something other than SMP8759?
I renamed it to CONFIG_PCIE_TANGO_SMP8759.
> > I forgot to ask for a MAINTAINERS update. Can you send that, too,
> > please?
> There's a "catch-all" rule for everything tango-related:
> ARM/TANGO ARCHITECTURE
> M: Marc Gonzalez <marc_gonzalez@xxxxxxxxxxxxxxxx>
> L: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> S: Maintained
> N: tango
> Is that enough?
Yep, sorry I didn't notice that. That's enough for
scripts/get_maintainer.pl to work, which is what I'm looking for.
If you confirm that
works for you, I'll include it in my v4.13 pull request.