netdev - Re: [PATCH 2/2] net: ks8851: Register MDIO bus and the internal PHY

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Date:   Wed, 30 Dec 2020 17:00:34 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Marek Vasut <marex@...x.de>
Cc:     netdev@...r.kernel.org, Heiner Kallweit <hkallweit1@...il.com>,
        Lukas Wunner <lukas@...ner.de>
Subject: Re: [PATCH 2/2] net: ks8851: Register MDIO bus and the internal PHY

> +static int ks8851_mdio_read(struct mii_bus *bus, int phy_id, int reg)
> +{
> +	struct ks8851_net *ks = bus->priv;
> +
> +	if (phy_id != 0)
> +		return 0xffffffff;
> +

Please check for C45 and return -EOPNOTSUPP.

       Andrew