[PATCH 0/4] arm64: dts: rockchip: Add HINLINK H66K/H68K

[Erik Beck]

> On Aug 30, 2025, at 17:30, Andrew Lunn <andrew at lunn.ch> wrote:
> 
> 
>> 
>> 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.

Thanks Andrew; It isn't clear to me which specific variation it has. I'll take another look at the boot logs and see. The silkscreen on the chips are faint, but will look there too.
> 
> 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

Thank you!
> 
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