[PATCH] powerpc/boot/dts: Fix dtc "pciex" warnings

[Christian Lamparter]

Hello,

On Tue, Sep 8, 2020 at 9:12 AM Michael Ellerman <mpe at ellerman.id.au> wrote:
> Christian Lamparter <chunkeey at gmail.com> writes:
> > On 2020-06-23 15:03, Michael Ellerman wrote:
> >> With CONFIG_OF_ALL_DTBS=y, as set by eg. allmodconfig, we see lots of
> >> warnings about our dts files, such as:
> >>
> >>    arch/powerpc/boot/dts/glacier.dts:492.26-532.5:
> >>    Warning (pci_bridge): /plb/pciex at d00000000: node name is not "pci"
> >>    or "pcie"
> >>
> >
> >
> > Unfortunately yes. This patch will break uboot code in Meraki MX60(W) / MX60.
> >
> >  > https://github.com/riptidewave93/meraki-uboot/blob/mx60w-20180413/board/amcc/bluestone/bluestone.c#L1178
> >
> > | if (!pci_available()) {
> > |     fdt_find_and_setprop(blob, "/plb/pciex at d00000000", "status",
> > |                   "disabled", sizeof("disabled"), 1);
> > | }
> >
> >
> > Backstory: There are two version of the Meraki MX60. The MX60
> > and the MX60W. The difference is that the MX60W has a populated
> > mini-pcie slot on the PCB for a >W<ireless card.
> >
> > That said, this is not earth shattering.
>
> I'm happy to revert that hunk if you think any one is actually booting
> mainline on those.

The MX60(W) or APM82181 in general?

The APM82181 devices run really well on the kernel 5.8. The APM82181
had some bitrot and missing pieces. But I started at around 4.4 with
upstreaming various bits and stuff. For proof, I can post a bootlog from
my MyBook Live dev station running my mbl-debian on this weekend:
<https://github.com/chunkeey/mbl-debian>.

This WD MyBook Live project really only needs
 - vanilla 5.8 (I got rid of the make-kpkg hack by switching to make bindeb-pkg)
 - the MyBookLive DTS.
 - kernel config is based on arch/powerpc/configs/44x/bluestone_defconfig +
   (I enabled dwc2 (USB-Port on the DUO), SATA, ext4(+squashfs),
   gpio-support, leds-support, crypto44x)
 - a powerpc32 userspace (debian's sid still builds up-to-date powerpc packages)

For the MX60(W): We have those two supported in OpenWrt. Currently they
are running a OpenWrt kernel based on stable 5.4 series. The missing "bit"
is upstream support for the AR8327 ethernet switch. I know that the chip
can be supported by qca8k: <https://www.spinics.net/lists/netdev/msg420810.html>

....

But of course: My future work with the MX60(W) (and AR8327) depends on how
this series goes. I'm testing the waters with the Meraki MR24 AP and the
WD MyBook Live series. Reason being that both devices are well supported.
They are available in great quantities... and all the core functions
are working.

Cheers,
Christian