netdev - Re: [PATCH v2 05/10] ARM: dts: aspeed: system1: Add RGMII support

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Message-ID: <8ae7c237-abcf-4079-a4ba-ce17e401917d@lunn.ch>
Date: Thu, 9 Jan 2025 15:48:09 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Ninad Palsule <ninad@...ux.ibm.com>
Cc: Jacky Chou <jacky_chou@...eedtech.com>,
	"andrew+netdev@...n.ch" <andrew+netdev@...n.ch>,
	"andrew@...econstruct.com.au" <andrew@...econstruct.com.au>,
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	"davem@...emloft.net" <davem@...emloft.net>,
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	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
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Subject: Re: [PATCH v2 05/10] ARM: dts: aspeed: system1: Add RGMII support

> When does someone use rgmii-txid and rgmii-rxid?

When there is an extra long RX clock line on the PCB, but not the TX
clock line, you would use rgmii-txid. If there is an extra long TX
clock line, but not RX clock, you would use rgmii-rxid. You do not see
this very often, but it does exist:

arch/arm/boot/dts/nxp/ls/ls1021a-tsn.dts

/* RGMII delays added via PCB traces */
&enet2 {
        phy-mode = "rgmii";
        status = "okay";

	Andrew