linux-kernel - Re: [PATCH] arm64: dts: imx8mm-venice: Fix PCI bus nodes

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Date:   Tue, 5 Dec 2023 10:13:21 -0800
From:   Tim Harvey <tharvey@...eworks.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Fabio Estevam <festevam@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: imx8mm-venice: Fix PCI bus nodes

On Thu, Nov 30, 2023 at 2:33 PM Rob Herring <robh@...nel.org> wrote:
>
> On Thu, Nov 30, 2023 at 1:28 PM Fabio Estevam <festevam@...il.com> wrote:
> >
> > Hi Rob,
> >
> > On Thu, Nov 30, 2023 at 4:18 PM Rob Herring <robh@...nel.org> wrote:
> > >
> > > The imx8mm-venice boards PCI bus nodes are a complete mess. The
> > > unit-addresses are wrong. The PCI bridge nodes are incomplete missing
> > > "device_type" and "ranges" and just wrong for "#address-cells" and
> > > "#size-cells" values.
> > >
> > > All of these issues are reported warnings if anyone bothered to pay
> > > attention. Sigh.

Rob,

Sorry about that. At the time the dt was submitted there were still so
many dt warnings it wasn't very clear what was a legitimate issue and
the PCI bindings are not that easy to understand.

> >
> > The warnings are gone in linux-next:
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/arch/arm64/boot/dts/freescale?h=next-20231130&id=d61c5068729a76a6183a897bcad4bf26e8d3d674
>
> Linux-next is wrong. The ethernet device should have a node name of
> 'ethernet'. The 'pcie' node name and 'device_type = "pci"' is for PCI
> buses/bridges only.

So as Fabio has tried to fix this with a patch that landed in
linux-next this patch won't apply. I'll submit one that covers your
changes.

It's always been unfortunate to have to have this level of detail in a
device-tree just to allow boot firmware to populate the mac address of
a PCI ethernet device.

Best Regards,

Tim