linux-kernel - Re: [PATCH v1 5/7] ARM: dts: sunxi: add support for NetCube Systems Nagami SoM

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Message-ID: <5023306.31r3eYUQgx@lukas-hpz440workstation>
Date: Sun, 06 Jul 2025 11:06:34 +0200
From: Lukas Schmid <lukas.schmid@...cube.li>
To: Andrew Lunn <andrew@...n.ch>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
 Jernej Skrabec <jernej.skrabec@...il.com>,
 Samuel Holland <samuel@...lland.org>,
 Paul Walmsley <paul.walmsley@...ive.com>,
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Alexandre Ghiti <alex@...ti.fr>, Maxime Ripard <mripard@...nel.org>,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
 linux-riscv@...ts.infradead.org
Subject:
 Re: [PATCH v1 5/7] ARM: dts: sunxi: add support for NetCube Systems Nagami
 SoM

On Sonntag, 6. Juli 2025 09:38:00 CEST Andrew Lunn wrote:
> > +&mdio {
> > +	lan8720a: ethernet-phy@1 {
> > +			compatible = "ethernet-phy-ieee802.3-c22";
> > +			reg = <1>;
> > +	};
> > +};
> 
> Just for clarification: The PHY is on the SOM? I've seen systems where
> the PHY is on the SOM, and the magnetics and RJ45 on the carrier
> board. I've also seen systems where the PHY, magnetics and RJ45 are on
> the carrier.

Yes that' the case here. The PHY is located on the SoM and the MDI signals
before any magnetics are on the SoM's Card-Edge. The magnetics are required
on the Carrier board (e.g. a MagJack or dedicated Transformer)
> 
>     Andrew


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