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Date:   Thu, 4 Jul 2019 15:27:16 +0000
From:   Jose Abreu <>
To:     Andrew Lunn <>,
        "Voon, Weifeng" <>
CC:     "David S. Miller" <>,
        Maxime Coquelin <>,
        "" <>,
        "" <>,
        Giuseppe Cavallaro <>,
        Florian Fainelli <>,
        Alexandre Torgue <>,
        biao huang <>,
        "Ong, Boon Leong" <>,
        "Kweh, Hock Leong" <>
Subject: RE: [PATCH v1 net-next] net: stmmac: enable clause 45 mdio support

From: Andrew Lunn <>

> Yes, that is all clear. The stmmac_mdio_c45_setup() does part of this
> setup. There is also a write to mii_address which i snipped out when
> replying. But why do you need to write to the data registers during a
> read? C22 does not need this write. Are there some bits in the top of
> the data register which are relevant to C45?

Yes. The register is 32bits. 16 lower bits are for data and remaining 
for C45 register address.

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