netdev - Re: GENET and UNIMAC MDIO probe issue?

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Date:   Fri, 22 Oct 2021 17:58:39 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Stefan Wahren <stefan.wahren@...e.com>
Cc:     Doug Berger <opendmb@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        Nicolas Saenz Julienne <nsaenz@...nel.org>
Subject: Re: GENET and UNIMAC MDIO probe issue?

Hi Stefan,

On Fri, Oct 22, 2021 at 05:35:50PM +0200, Stefan Wahren wrote:
> Hi Maxime,
> 
> Am 22.10.21 um 16:33 schrieb Maxime Ripard:
> > 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

I thought upstream_kernel would be enough, but following your message
I forced it using device_tree, and indeed it works.

But I'm confused now, I don't have any other DTB for the CM4 on that
boot partition, where is that other device tree coming from?

Maxime
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