From: Andrew Lunn <andrew@lunn.ch>
To: Tiju Jacob <jacobtiju@gmail.com>
Cc: netdev@vger.kernel.org, Vivien Didelot <vivien.didelot@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Vladimir Oltean <olteanv@gmail.com>
Subject: Re: mv88e6xxx: 88E6320 external PHY on MDC_PHY/MDIO_PHY - (GPIO 7/8) — is mdio-gpio the right approach?
Date: Tue, 12 May 2026 14:39:04 +0200 [thread overview]
Message-ID: <1b509630-5c2e-4763-af07-28cd165678fa@lunn.ch> (raw)
In-Reply-To: <CADAg6uxK+xjPRgmSXeqfmbw1RgzOhUukkc-X72O61ywKhvx1_Q@mail.gmail.com>
On Tue, May 12, 2026 at 07:32:19AM -0400, Tiju Jacob wrote:
> Hi All,
>
> We have an 88E6320 (marvell,mv88e6085) with an 88E1512 PHY on Port 5.
>
> The PHY's MDIO is wired to the switch's MDC_PHY/MDIO_PHY pins (52/53
> =GPIO 7/8), which are separate physical pins from MDC_CPU/MDIO_CPU
> (54/55) used by the CPU. GPIO 7/8 read HIGH as inputs confirming the
> PHY is alive.
>
> We tested exhaustively at runtime: marvell,mv88e6xxx-mdio-external,
marvell,mv88e6xxx-mdio-external is for the 6390 family and newer. It
is not relevant for the 6320.
The 6320 has one MDIO bus, covering both the internal and external
devices. What address do you have the 88E1512 PHY strapped to? You
need to avoid the internal devices. Ideally you want it on address 5,
but it can be other addresses.
Andrew
prev parent reply other threads:[~2026-05-12 12:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-12 11:32 mv88e6xxx: 88E6320 external PHY on MDC_PHY/MDIO_PHY - (GPIO 7/8) — is mdio-gpio the right approach? Tiju Jacob
2026-05-12 12:39 ` Andrew Lunn [this message]
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