linux-kernel - RE: [PATCH v1 net-next] net: stmmac: enable clause 45 mdio support

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Date:   Thu, 4 Jul 2019 15:27:16 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Andrew Lunn <andrew@...n.ch>,
        "Voon, Weifeng" <weifeng.voon@...el.com>
CC:     "David S. Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        biao huang <biao.huang@...iatek.com>,
        "Ong, Boon Leong" <boon.leong.ong@...el.com>,
        "Kweh, Hock Leong" <hock.leong.kweh@...el.com>
Subject: RE: [PATCH v1 net-next] net: stmmac: enable clause 45 mdio support

From: Andrew Lunn <andrew@...n.ch>

> 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.