quoted

--- a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
+++ b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts

@@ -196,7 +196,8 @@ &eth0 {

 	mdio {
 		phy0: phy@1 {
-			compatible = "ethernet-phy-ieee802.3-c22";
+			compatible = "ethernet-phy-id001c.c916",
+				     "ethernet-phy-ieee802.3-c22";

Indeed that's merely a workaround :(

Despite is being a workaround, there has not been much progress on a
generic framework for dealing with clocks, resets, regulators etc,
before probing PHYs. So this is probably what you want to do.

       Andrew