[PATCH] arm64: dts: rockchip: Add compatible for Ethernet PHY

[Adrian Kossmann]

Hi Andrew,

> It is a bit unusual for phylib to get the wrong driver, so i would
like to understand this a bit more.

after double-checking my setup I found that the PHY is in fact always 
bound to the RTL8211F driver, even without the compatible string, and 
this was rather an issue with my setup. 

The link instability I observed was caused by inappropriate RGMII RX/TX 
delay settings in the mainline DTS. With the current values for 
rx_delay and tx_delay in the mainline DTS the link collapsed under load. 
I've troubleshooted this with a known-good DTB and using its rx_delay 
and tx_delay values fixes the issue. 
I will send a v2 patch adjusting the delays instead of adding a compatible.

      Adrian