linux-kernel - Re: [PATCH v3 10/13] ARM: dts: aspeed: Add Facebook Fuji-data64 (AST2600) Board

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Message-ID: <aIGGdbIX9HaV4dB/@localhost.localdomain>
Date: Wed, 23 Jul 2025 18:03:49 -0700
From: Tao Ren <rentao.bupt@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Joel Stanley <joel@....id.au>,
	Andrew Jeffery <andrew@...econstruct.com.au>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Tao Ren <taoren@...a.com>
Subject: Re: [PATCH v3 10/13] ARM: dts: aspeed: Add Facebook Fuji-data64
 (AST2600) Board

On Thu, Jul 24, 2025 at 02:03:20AM +0200, Andrew Lunn wrote:
> > +&mac3 {
> > +	status = "okay";
> > +	phy-mode = "rgmii";
> 
> Does the PCB have extra long clock lines to implement the 2ns delay?
> 
> 	Andrew

Hi Andrew,

Thank you for catching it. I didn't notice the settings because the file
is copied from the exiting fuji.dts with minor changes.

The delay is currently introduced on MAC side (by manually setting SCU
registers), but I guess I can update phy-mode to "rgmii-id" so the delay
can be handled by the PHY?


Thanks,

Tao