linux-kernel - Re: [PATCH net-next 1/8] dt-bindings: net: mediatek,net: add mt7988-eth binding

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Date:   Mon, 12 Jun 2023 11:51:28 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Daniel Golle <daniel@...rotopia.org>
Cc:     netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        John Crispin <john@...ozen.org>, Felix Fietkau <nbd@....name>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sam Shih <Sam.Shih@...iatek.com>
Subject: Re: [PATCH net-next 1/8] dt-bindings: net: mediatek,net: add
 mt7988-eth binding

On Sun, Jun 11, 2023 at 01:32:27AM +0100, Daniel Golle wrote:
> Introduce DT bindings for the MT7988 SoC to mediatek,net.yaml.
> The MT7988 SoC got 3 Ethernet MACs operating at a maximum of
> 10 Gigabit/sec supported by 2 packet processor engines for
> offloading tasks.
> The first MAC is hard-wired to a built-in switch which exposes
> four 1000Base-T PHYs as user ports.
> It also comes with built-in 2500Base-T PHY which can be used
> with the 2nd GMAC.
> The 2nd and 3rd GMAC can be connected to external PHYs or provide
> SFP(+) cages attached via SGMII, 1000Base-X, 2500Base-X, USXGMII,
> 5GBase-KR or 10GBase-KR.

Are you _sure_ that they are GBASE-KR, and not just GBASE-R ? Are they
designed for backplane links, and thus have some form of negotiation?
If they have no negotiation, they may not be GBASE-KR.

Thanks.

-- 
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