linux-kernel - Re: [PATCH 4/5] arm64: dts: allwinner: a527: add EMAC0 to Radxa A5E board

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Message-ID: <aa38baed-f528-4650-9e06-e7a76c25ec89@lunn.ch>
Date: Wed, 23 Apr 2025 18:58:37 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Yixun Lan <dlan@...too.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Maxime Ripard <mripard@...nel.org>,
	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>,
	Andre Przywara <andre.przywara@....com>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 4/5] arm64: dts: allwinner: a527: add EMAC0 to Radxa A5E
 board

> +&emac0 {
> +	phy-mode = "rgmii";

Does the PCB have extra long clock lines in order to provide the
needed 2ns delay? I guess not, so this should be rgmii-id.

> +	phy-handle = <&ext_rgmii_phy>;
> +
> +	allwinner,tx-delay-ps = <300>;
> +	allwinner,rx-delay-ps = <400>;

These are rather low delays, since the standard requires 2ns. Anyway,
once you change phy-mode, you probably don't need these.

     Andrew