linux-kernel - Re: [v1] arm64: dts: freescale: imx93-var-som: update eqos support for MaxLinear PHY

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Message-ID: <d5f891d7-d24a-4f85-b59d-313b925c4495@lunn.ch>
Date: Wed, 4 Jun 2025 14:00:55 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Stefano Radaelli <stefano.radaelli21@...il.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [v1] arm64: dts: freescale: imx93-var-som: update eqos support
 for MaxLinear PHY


61;8001;1cOn Wed, Jun 04, 2025 at 09:37:39AM +0200, Stefano Radaelli wrote:
> Hi Andrew,
> 
> I double-checked with our hardware team, and it turns out that all required
> RGMII delays are already handled by the hardware on the SOM (trace
> tuning + PHY config).

What do you mean by PHY config?

The four RGMII modes you can use with phy-mode are purely about the
PCB. If you have the PHY strapped to add delays, what does not count
for PCB, and if you are not careful, future software could reconfigure
it.

	Andrew