linux-kernel - Re: [PATCH v2 04/14] dt-bindings: arm: mediatek: document WED binding for MT7622

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Message-ID: <CAK8P3a1A6QYajv_HTw79HjiJ8CN6YPeKXc_X3ZFD83pdOqVTkQ@mail.gmail.com>
Date:   Wed, 6 Apr 2022 10:29:18 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Felix Fietkau <nbd@....name>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Networking <netdev@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 04/14] dt-bindings: arm: mediatek: document WED binding
 for MT7622

On Wed, Apr 6, 2022 at 10:18 AM Felix Fietkau <nbd@....name> wrote:
> On 06.04.22 10:09, Krzysztof Kozlowski wrote:
> > On 05/04/2022 21:57, Felix Fietkau wrote:
> >> From: Lorenzo Bianconi <lorenzo@...nel.org>
> >>
> >> Document the binding for the Wireless Ethernet Dispatch core on the MT7622
> >> SoC, which is used for Ethernet->WLAN offloading
> >> Add related info in mediatek-net bindings.
> >>
> >> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> >> Signed-off-by: Felix Fietkau <nbd@....name>
> >
> > Thank you for your patch. There is something to discuss/improve.
> >
> >> ---
> >>  .../arm/mediatek/mediatek,mt7622-wed.yaml     | 50 +++++++++++++++++++
> >>  .../devicetree/bindings/net/mediatek-net.txt  |  2 +
> >>  2 files changed, 52 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-wed.yaml
> >
> > Don't store drivers in arm directory. See:
> > https://lore.kernel.org/linux-devicetree/YkJa1oLSEP8R4U6y@robh.at.kernel.org/
> >
> > Isn't this a network offload engine? If yes, then probably it should be
> > in "net/".
> It's not a network offload engine by itself. It's a SoC component that
> connects to the offload engine and controls a MTK PCIe WLAN device,
> intercepting interrupts and DMA rings in order to be able to inject
> packets coming in from the offload engine.
> Do you think it still belongs in net, or maybe in soc instead?

I think it belongs into drivers/net/. Presumably this has some kind of
user interface to configure which packets are forwarded? I would not
want to maintain that in a SoC driver as this clearly needs to communicate
with both of the normal network devices in some form.

         Arnd