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

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Message-ID: <CAL_JsqJmK5UDN_xKjJHac1L4Wsrx1GLDmeek5=K7gm=W9XPkOw@mail.gmail.com>
Date:   Wed, 6 Dec 2023 16:45:57 -0600
From:   Rob Herring <robh@...nel.org>
To:     Tim Harvey <tharvey@...eworks.com>
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 Tue, Dec 5, 2023 at 12:13 PM Tim Harvey <tharvey@...eworks.com> wrote:
>
> 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.

Thanks.

> 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.

More unfortunate are incomplete h/w designs lacking the MAC address. :(

Not really any way around it I think if you want something that works
for any device and any number of devices.

Rob