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From:   Fabio Estevam <festevam@gmail.com>
Date:   Thu, 16 Jul 2020 15:01:23 -0300
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Subject: Re: [PATCH v2 2/2] ARM: dts: imx7: add support for kamstrup flex concentrator
To:     Bruno Thomsen <bruno.thomsen@gmail.com>
Cc:     linux-kernel <linux-kernel@vger.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>, Shawn Guo <shawnguo@kernel.org>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        NXP Linux Team <linux-imx@nxp.com>,
        Bruno Thomsen <bth@kamstrup.com>
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Hi Bruno,

On Thu, Jul 16, 2020 at 2:26 PM Bruno Thomsen <bruno.thomsen@gmail.com> wrote:

> Limitations: Ethernet PHY type auto detection does not
> work when using reset-{assert-us,deassert-us,gpios}
> properties so it's using a fixed PHY type ID for now. Auto
> detection worked when using the deprecated FEC properties
> phy-reset-{gpios,duration,post-delay}.

I think we need to understand this better. Why does it fail?

I gave a test on an imx6q-sabresd and the Ethernet PHY (AR8031) could
be properly detected using reset-{assert-us,deassert-us,gpios}
properties inside the mdio node.

Is this a Micrel KSZ8081 specific issue?

Please report this issue to the Ethernet PHY folks.