netdev - Re: [PATCH net-next 1/4] dt-bindings: net: ethernet-controller: update descriptions of RGMII modes

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Message-ID: <aAdWU4xPc2UOU5wu@shell.armlinux.org.uk>
Date: Tue, 22 Apr 2025 09:41:55 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Siddharth Vadapalli <s-vadapalli@...com>
Cc: Matthias Schiffer <matthias.schiffer@...tq-group.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Andy Whitcroft <apw@...onical.com>,
	Dwaipayan Ray <dwaipayanray1@...il.com>,
	Lukas Bulwahn <lukas.bulwahn@...il.com>,
	Joe Perches <joe@...ches.com>, Jonathan Corbet <corbet@....net>,
	Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
	Roger Quadros <rogerq@...nel.org>, Tero Kristo <kristo@...nel.org>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux@...tq-group.com
Subject: Re: [PATCH net-next 1/4] dt-bindings: net: ethernet-controller:
 update descriptions of RGMII modes

On Tue, Apr 15, 2025 at 05:25:23PM +0530, Siddharth Vadapalli wrote:
> For a fixed PHY,

No such thing in reality. The kernel has an obsolete idea of a fixed PHY
which is a software-emulated PHY to represent a fixed link, but that is
basically dead with phylink (there is now no PHY for fixed links under
phylink).

As I stated, "phy-mode" describes how the MAC needs to configure its
PHY facing interface, whether there is or is not a PHY present. One can
argue that it's misnamed, but it's buried in deep DT history going back
decades, and there's a rule that we don't break backwards compatibility.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!