On Thu, Jun 03, 2021 at 04:34:53PM +0200, Pali Rohár wrote:

Hello!

In commit 84e0f1c13806 ("powerpc/mpc85xx: Add MDIO bus muxing support to
the board device tree(s)") was added following DT property into DT node:
arch/powerpc/boot/dts/fsl/t1023rdb.dts fm1mac3: ethernet@e4000

    phy-connection-type = "sgmii-2500";

But currently kernel does not recognize this "sgmii-2500" phy mode. See
file include/linux/phy.h. In my opinion it should be "2500base-x" as
this is mode which operates at 2.5 Gbps.

I do not think that sgmii-2500 mode exist at all (correct me if I'm
wrong).

Kind of exist, unofficially. Some vendors run SGMII over clocked at
2500. But there is no standard for it, and it is unclear how inband
signalling should work. Whenever i see code saying 2.5G SGMII, i
always ask, are you sure, is it really 2500BaseX? Mostly it gets
changed to 2500BaseX after review.

PHY mode sgmii-2500 does not exist in mainline.

	Andrew