Re: [PATCH] net: mdio-octeon: Add PCI driver binding.

[David Daney]

On 09/24/2015 03:04 PM, David Daney wrote:
> On 09/24/2015 02:52 PM, David Miller wrote:
> > From: David Daney <ddaney.cavm@xxxxxxxxx>
> > Date: Tue, 22 Sep 2015 17:41:36 -0700
> >
> > > From: David Daney <david.daney@xxxxxxxxxx>
> > >
> > > When the Cavium mdio-octeon devices appear in the Thunder family of
> > > arm64 based SoCs, they show up as PCI devices.  Add PCI driver
> > > wrapping so the driver is bound in the standard PCI device scan.
> > >
> > > When in this form, a single PCI device may have more than a single
> > > bus, we call this a "nexus" of buses.  The standard firmware
> > > device_for_each_child_node() iterator is used to find the individual
> > > buses underneath the "nexus".
> > >
> > > Update the device tree binding documentation for the new PCI driver
> > > binding.
> > >
> > > Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
> >
> > This patch breaks the build:
>
> For which architecture?
>
> I tested it on mips and arm64.  I will try x86, as I guess that is where
> you tried your test build.
>
>
> >    CC [M]  drivers/net/phy/mdio-octeon.o
> > In file included from drivers/net/phy/mdio-octeon.c:13:0:
> > include/linux/module.h:128:27: error: redefinition of ʽ__inittestʼ
> >    static inline initcall_t __inittest(void)  \

OK, I reproduced this failure.  It happens with a module build only.

Sorry for the breakage, I will fix it and resubmit.

David Daney


                             ^
> [...]
>
> > And frankly I'm not sure I like this change anyways.  If the OF nodes
> > are there, simply add code to match on those OF nodes.
> >
> > This is better than assuming what sits underneath a PCI node, without
> > any checks for the 'name' or 'compatible' properties at all.  That's
> > what they are there for afterall.
>
> There is, somewhat of, a method behind the madness here.
>
> In order to use MSI-X interrupts, we need a corresponding PCI device.
> Now, this driver doesn't currently use interrupts, but other devices in
> the SoC do, so they must be PCI devices.
>
> The idea is to have the type of all drivers uniformly be PCI, rather
> than a random mix of PCI and platform, and then switch them back and
> forth as PCI features are/are-not used in the driver.
>
> Also we need to consider ACPI firmware in addition to OF device tree.
>
> David Daney

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/