linux-kernel - Re: [net-next v2 3/4] ARM: dts: aspeed: ast2600evb: Add delay setting for MAC

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Message-ID: <0f0383dd-a55b-48e6-824c-798c2a9e173e@lunn.ch>
Date: Fri, 15 Aug 2025 20:17:41 +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,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org,
	taoren@...a.com, bmc-sw2@...eedtech.com
Subject: Re: [net-next v2 3/4] ARM: dts: aspeed: ast2600evb: Add delay
 setting for MAC

> @@ -149,6 +155,9 @@ &mac2 {
>  
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_rgmii3_default>;
> +
> +	rx-internal-delay-ps = <2000>;
> +	tx-internal-delay-ps = <2000>;
>  };
>  
>  &mac3 {
> @@ -159,6 +168,9 @@ &mac3 {
>  
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_rgmii4_default>;
> +
> +	rx-internal-delay-ps = <2000>;
> +	tx-internal-delay-ps = <2000>;
>  };

Documentation/devicetree/bindings/net/ethernet-controller.yaml

# Sometimes there is a need to fine tune the delays. Often the MAC or
# PHY can perform this fine tuning. In the MAC node, the Device Tree
# properties 'rx-internal-delay-ps' and 'tx-internal-delay-ps' should
# be used to indicate fine tuning performed by the MAC. The values
# expected here are small. A value of 2000ps, i.e 2ns, and a phy-mode
# of 'rgmii' will not be accepted by Reviewers.

    Andrew

---
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