linux-kernel - Re: [PATCH net-next 3/4] net: ethernet: ti: am65-cpsw: fixup PHY mode for fixed RGMII TX delay

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Message-ID: <26696cfd-85f2-4876-9a56-f005eedc8380@lunn.ch>
Date: Wed, 30 Apr 2025 18:15:59 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Roger Quadros <rogerq@...nel.org>
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>,
	Siddharth Vadapalli <s-vadapalli@...com>,
	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 3/4] net: ethernet: ti: am65-cpsw: fixup PHY
 mode for fixed RGMII TX delay

On Wed, Apr 30, 2025 at 05:56:29PM +0300, Roger Quadros wrote:
> Matthias,
> 
> On 15/04/2025 13:18, Matthias Schiffer wrote:
> > All am65-cpsw controllers have a fixed TX delay, so the PHY interface
> > mode must be fixed up to account for this.
> > 
> > Modes that claim to a delay on the PCB can't actually work. Warn people
> Could you please help me understand this statement? Which delay? TX or RX?

See if this helper:

https://patchwork.kernel.org/project/netdevbpf/patch/20250429-v6-15-rc3-net-rgmii-delays-v1-1-f52664945741@lunn.ch/

There will be a V2 soon.

      Andrew