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Date:   Sun, 26 Dec 2021 22:51:08 +0100
From:   Andrew Lunn <andrew@lunn.ch>
To:     Daniel Golle <daniel@makrotopia.org>
Cc:     linux-mediatek@lists.infradead.org, netdev@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Felix Fietkau <nbd@nbd.name>, John Crispin <john@phrozen.org>,
        Sean Wang <sean.wang@mediatek.com>,
        Mark Lee <Mark-MC.Lee@mediatek.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Russell King <linux@armlinux.org.uk>
Subject: Re: [PATCH] net: ethernet: mtk_eth_soc: implement Clause 45 MDIO
 access
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> +	if (phy_register & MII_ADDR_C45) {
> +		u8 dev_num = (phy_register >> 16) & 0x1f;
> +		u16 reg = (u16)(phy_register & 0xffff);

Hi Daniel

You can use the helpers

mdio_phy_id_is_c45()
mdio_phy_id_prtad()
mdio_phy_id_devad()

	Andrew