linux-kernel - Re: [PATCH v2 2/2] ARM: dts: imx7: add support for kamstrup flex concentrator

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Message-ID: <CAOMZO5B7cJmF4e78xbErzBHfMw4MuF09eXti4xAUFcKOGKXqNw@mail.gmail.com>
Date:   Thu, 16 Jul 2020 15:01:23 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Bruno Thomsen <bruno.thomsen@...il.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Shawn Guo <shawnguo@...nel.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        Bruno Thomsen <bth@...strup.com>
Subject: Re: [PATCH v2 2/2] ARM: dts: imx7: add support for kamstrup flex concentrator

Hi Bruno,

On Thu, Jul 16, 2020 at 2:26 PM Bruno Thomsen <bruno.thomsen@...il.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.