linux-kernel - Re: 回覆: [net-next v2 0/4] Add AST2600 RGMII delay into ftgmac100

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Message-ID: <3966765c-876e-4433-9c82-8d89c6910490@lunn.ch>
Date: Wed, 20 Aug 2025 04:43:34 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Jacky Chou <jacky_chou@...eedtech.com>
Cc: 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>, Joel Stanley <joel@....id.au>,
	Andrew Jeffery <andrew@...econstruct.com.au>,
	Simon Horman <horms@...nel.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Uwe Kleine-König <u.kleine-koenig@...libre.com>,
	Po-Yu Chuang <ratbert@...aday-tech.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
	"taoren@...a.com" <taoren@...a.com>
Subject: Re: 回覆: [net-next v2 0/4] Add
 AST2600 RGMII delay into ftgmac100

On Wed, Aug 20, 2025 at 12:40:02AM +0000, Jacky Chou wrote:
> Hi Andrew,
> 
> Thank you for your reply.
> 
> > > This patch series adds support for configuring RGMII internal delays
> > > for the Aspeed AST2600 FTGMAC100 Ethernet MACs.
> > 
> > So i think you are doing things in the wrong order. You first need to sort out the
> > mess of most, if not all, AST2600 have the wrong phy-mode, because the
> > RGMII delay configuration is hidden, and set wrongly.
> > 
> > Please fix that first.
> > 
> 
> The RGMII delay is configured in U-boot stage, and it is not changed when booting to
> Linux. I want to know whether the first thing to correct here is whether the phy-mode
> in aspeed-ast2600-evb.dts is rgmii-id. Our AST2600 EVB, there is no delay on board,
> so, I need to change the phy-mode to "rgmii-id" to meet the RGMII usage first?

If there is no delay on the PCB, then phy-mode is "rgmii-id".

	Andrew