linux-kernel - Re: [RFC PATCH] dt-bindings: net: nxp,tja11xx: add compatible support

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Message-ID: <20200504134032.GB190789@lunn.ch>
Date:   Mon, 4 May 2020 15:40:32 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Marek Vasut <marex@...x.de>, David Jander <david@...tonic.nl>,
        devicetree@...r.kernel.org
Subject: Re: [RFC PATCH] dt-bindings: net: nxp,tja11xx: add compatible support

On Mon, May 04, 2020 at 10:44:12AM +0200, Oleksij Rempel wrote:
> Hi all,
> 
> here is first attempt to rework this binding. So far I have following
> questions and/or issues:
> - currently this PHY is identified by ID, not by compatible. Should it
>   be probed by compatible?
>   Theoretically I can use:
>   	compatible = "nxp,tja1102", "ethernet-phy-ieee802.3-c22";

Hi Oleksij

This will not work, in the current framework. PHYs probe via the ID
registers, or ethernet-phy-id0141.0e90 like compatible strings. MDIO
devices, which means devices like Ethernet switches, probe via
compatible strings. There are a few old DT blobs which do have a
compatible for the PHY, but they are white listed and ignored. See
of_mdio.c, whitelist_phys and of_mdiobus_child_is_phy().

If the DT validation code is wrongly forcing you to have a compatible,
i think your best bet is to use the ethernet-phy-id with the correct
ID values.

   Andrew