netdev - Re: [PATCH net-next v3 2/3] net: phy: add Broadcom BCM54140 support

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Date:   Wed, 22 Apr 2020 12:15:27 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     michael@...le.cc
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, jdelvare@...e.com, linux@...ck-us.net,
        andrew@...n.ch, f.fainelli@...il.com, hkallweit1@...il.com,
        linux@...linux.org.uk
Subject: Re: [PATCH net-next v3 2/3] net: phy: add Broadcom BCM54140 support

From: Michael Walle <michael@...le.cc>
Date: Mon, 20 Apr 2020 20:21:12 +0200

> The Broadcom BCM54140 is a Quad SGMII/QSGMII Copper/Fiber Gigabit
> Ethernet transceiver.
> 
> This also adds support for tunables to set and get downshift and
> energy detect auto power-down.
> 
> The PHY has four ports and each port has its own PHY address.
> There are per-port registers as well as global registers.
> Unfortunately, the global registers can only be accessed by reading
> and writing from/to the PHY address of the first port. Further,
> there is no way to find out what port you actually are by just
> reading the per-port registers. We therefore, have to scan the
> bus on the PHY probe to determine the port and thus what address
> we need to access the global registers.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>

Applied.