linux-kernel - Re: [PATCH 0/4] arm64: dts: rockchip: Add HINLINK H66K/H68K

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Message-ID: <2803b3d8-332e-4ada-a28f-eeba8285b7ec@lunn.ch>
Date: Sat, 30 Aug 2025 23:26:35 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Erik Beck <xunil@...omasoft.com>
Cc: Heiko Stuebner <heiko@...ech.de>, Chukun Pan <amadeus@....edu.cn>,
	Rob Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 0/4] arm64: dts: rockchip: Add HINLINK H66K/H68K

> As I worked on my dts, I discovered that the 1Gb ethernet ports, using an
> RTL8211, don't support rgmii-id mode; only rgmii.
> (https://www.realtek.com/Product/Index?id=3976&cate_id=786). 

Which exact RTL8211 does the board use? You link to information for
the RTL8211FD(I)-CG, which i assume is supported in Linux as RTL8211F.

https://elixir.bootlin.com/linux/v6.16.3/source/drivers/net/phy/realtek/realtek_main.c#L519

This indicates it supports all four RGMII modes. And in general, all
PHY drivers in Linux for RGMII PHYs support all four RGMII modes.

> Changing this makes a huge difference in the ethernet throughput speed. With
> rgmii-id mode specified, throughput is about 6.5 Mbs. Changing this to rgmii
> mode increases throughput to about 960 Mbs. 

Here is some more information about that the four RGMII modes mean,
and how you should use them in Linux:

https://elixir.bootlin.com/linux/v6.16.3/source/Documentation/devicetree/bindings/net/ethernet-controller.yaml#L264

	Andrew