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Date:   Wed, 26 Aug 2020 14:56:58 +0200
From:   Andrew Lunn <>
To:     Sascha Hauer <>
Cc:, Florian Fainelli <>,
        Heiner Kallweit <>,
Subject: Re: ethernet-phy-ieee802.3-c22 binding and reset-gpios

On Wed, Aug 26, 2020 at 10:58:57AM +0200, Sascha Hauer wrote:
> Hi Andrew,
> Well there is only one phy connected to the bus, so it makes no
> difference if I say the reset GPIO is for the whole bus or for a single
> phy only. The per bus reset should work, but currently it doesn't. First
> reason I found out that mdiobus_register() doesn't handle -EPROBE_DEFER
> returned by the devm_gpiod_get_optional() properly, patch follows.


> Second reason is that the phy is not detected (id read returns 0xffff)
> when the reset is attached to the bus. So far I haven't found the reason
> for that.

Try giving the PHY a bit longer to recover from the reset before
probing it.

And what SoC are you using? Is it FEC ethernet driver? That has MDIO
issues at the moment.


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