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Message-ID: <20190731023417.GD9523@lunn.ch>
Date:   Wed, 31 Jul 2019 04:34:17 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Tao Ren <taoren@...com>
Cc:     Vladimir Oltean <olteanv@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Arun Parameswaran <arun.parameswaran@...adcom.com>,
        Justin Chen <justinpopo6@...il.com>,
        netdev <netdev@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Andrew Jeffery <andrew@...id.au>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH net-next 2/2] net: phy: broadcom: add 1000Base-X support
 for BCM54616S

> Hi Andrew,
> 
> The BCM54616S PHY on my machine is connected to a BCM5396 switch chip over backplane (1000Base-KX).

Ah, that is different. So the board is using it for RGMII to 1000Base-KX?

phy-mode is about the MAC-PHY link. So in this case RGMII.

There is no DT way to configure the PHY-Switch link. However, it
sounds like you have the PHY strapped so it is doing 1000BaseX on the
PHY-Switch link. So do you actually need to configure this?

You report you never see link up? So maybe the problem is actually in
read_status? When in 1000BaseX mode, do you need to read the link
status from some other register? The Marvell PHYs use a second page
for 1000BaseX.

    Andrew

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