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

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Message-ID: <174526093810.2599006.6297495760471249185.robh@kernel.org>
Date: Mon, 21 Apr 2025 13:42:18 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Matthias Schiffer <matthias.schiffer@...tq-group.com>
Cc: linux-kernel@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>,
	Nishanth Menon <nm@...com>, "David S. Miller" <davem@...emloft.net>,
	Jonathan Corbet <corbet@....net>,
	Andrew Lunn <andrew+netdev@...n.ch>, netdev@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>,
	Dwaipayan Ray <dwaipayanray1@...il.com>,
	Roger Quadros <rogerq@...nel.org>, Tero Kristo <kristo@...nel.org>,
	Vignesh Raghavendra <vigneshr@...com>,
	Jakub Kicinski <kuba@...nel.org>,
	Lukas Bulwahn <lukas.bulwahn@...il.com>,
	Siddharth Vadapalli <s-vadapalli@...com>,
	devicetree@...r.kernel.org,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, linux@...tq-group.com,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH net-next 1/4] dt-bindings: net: ethernet-controller:
 update descriptions of RGMII modes


On Tue, 15 Apr 2025 12:18:01 +0200, Matthias Schiffer wrote:
> As discussed [1], the comments for the different rgmii(-*id) modes do not
> accurately describe what these values mean.
> 
> As the Device Tree is primarily supposed to describe the hardware and not
> its configuration, the different modes need to distinguish board designs
> (if a delay is built into the PCB using different trace lengths); whether
> a delay is added on the MAC or the PHY side when needed should not matter.
> 
> Unfortunately, implementation in MAC drivers is somewhat inconsistent
> where a delay is fixed or configurable on the MAC side. As a first step
> towards sorting this out, improve the documentation.
> 
> Link: https://lore.kernel.org/lkml/d25b1447-c28b-4998-b238-92672434dc28@lunn.ch/ [1]
> Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
> ---
>  .../bindings/net/ethernet-controller.yaml        | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)
> 

Acked-by: Rob Herring (Arm) <robh@...nel.org>