orangepi5: initial motorcomm phy

[apowers313]

Adds MotorComm PHY support. Code compiles and boots, but PHY and Ethernet aren't recognized on boot.

[apowers313]

I believe the MotorComm PHY is working, but U-Boot shows "Net: No ethernet found." because the right Ethernet MAC isn't compiled in to call phy_connect().

I have tried CONFIG_RGMII, CONFIG_GMAC_ROCKCHIP, and CONFIG_ETH_DESIGNWARE but none of the those three seem to detect the rk3588 Ethernet MAC.

Any ideas would be helpful.

[apowers313]

It looks like this might require CONFIG_SPL_ETH_SUPPORT.

[apowers313]

Might also require updating the device tree in rk3588s-orangepi-5.dts.

When Linux boots, it appears to pick up the second ethernet port from the device tree (as denoted by the device fe1c0000.ethernet):

[ 15.718173] rk_gmac-dwmac fe1c0000.ethernet eth0: PHY [stmmac-1:01] driver [YT8531 Gigabit Ethernet] (irq=POLL)

This device can be found in rk3588s.dtsi in the Linux device tree. A similar (but not identical) rk3588s.dtsi exists in the U-Boot tree but isn't currently included in rk3588s-orangepi-5.dts in U-Boot like it is in Linux.