Re: GENET and UNIMAC MDIO probe issue?

On 10/22/21 8:35 AM, Stefan Wahren wrote:

Hi Maxime,

Am 22.10.21 um 16:33 schrieb Maxime Ripard:

quoted

Hi Florian, Doug,

I'm currently trying to make the RaspberryPi CM4 IO board probe its
ethernet controller, and it looks like genet doesn't manage to find its
PHY and errors out with:

[    3.240435] libphy: Fixed MDIO Bus: probed
[    3.248849] bcmgenet fd580000.ethernet: GENET 5.0 EPHY: 0x0000
[    3.259118] libphy: bcmgenet MII bus: probed
[    3.278420] mdio_bus unimac-mdio--19: MDIO device at address 1 is missing.
[    3.285661] unimac-mdio unimac-mdio.-19: Broadcom UniMAC MDIO bus

....

[   13.082281] could not attach to PHY
[   13.089762] bcmgenet fd580000.ethernet eth0: failed to connect to PHY
[   74.739621] could not attach to PHY
[   74.746492] bcmgenet fd580000.ethernet eth0: failed to connect to PHY

Here's the full boot log:
https://pastebin.com/8RhuezSn

looks like you are using the vendor DTB, please use the upstream DTB
from linux-next:

bcm2711-rpi-cm4-io.dtb

Stefan beat me to it, but yes, it looked like you had an Ethernet PHY at
MDIO address 25, when arch/arm/boot/dts/bcm2711-rpi-cm4.dtsi indicates
that it should be at address 0, therefore it won't work.

The issue with mdio-bcm-unimac not being loaded would only be applicable
in a modular case anyway, when it is built-in, there would be no such
problem. Let me know if there are other changes that are necessary, DTS
or else.
-- 
Florian