MDIO bus for non-phy device

Andy041292 · 01-30-2020, 12:09 AM

I have a board with three devices on mdio bus connected to SoC (AM3358). Only one phy (AR8035) is connected to SoC through rgmii, the other two devices (MAX24287 and DP83620) have only mdio connection. I've integrated drivers for these devices into linux kernel (4.14.40). Davinchi_mdio finds all devices and attaches appropriate drivers, but I can't access registers through mdio because I only have two interfaces (I don't have Ethernet interfaces for MAX24287 and DP83620). How can I workaround these issue? Maybe there is a way I can describe non-phy MDIO devices in linux device tree?

Mahdi_sh · 01-05-2023, 09:55 AM

Hello, I have a similar issue. Did you manage to resolve your case?

kaehnd · 01-26-2023, 11:52 AM

One option would be to use mdio-tools, and the associated mdio-netlink kernel module (though this would not have worked for the OP, since this requires kernel 5.6 or later)

https://github.com/wkz/mdio-tools

If building a distro with yocto, this is newly available as a recipe within meta-networking:
https://github.com/openembedded/meta...ort/mdio-tools

hueljannie · 12-07-2023, 02:34 AM

Quote:

Originally Posted by kaehnd

One option would be to use mdio-tools, and the associated mdio-netlink kernel module (though this would not have worked for the OP, since this requires kernel 5.6 or later)

https://github.com/wkz/mdio-tools

If building a distro with yocto, this is newly available as a recipe within meta-networking:
https://github.com/openembedded/meta...ort/mdio-tools geometry dash

Thank you, I encountered a comparable issue as well.
I have successfully resolved the issue I was facing. I lack the expertise to identify this.