linux-kernel - Re: [PATCH 2/2] ARM: dts: aspeed: ventura2: Add Meta ventura2 BMC

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Message-ID: <CAF7HswN0hhJQ-gmE59cKTuPyzrs1A3rM8Xw+Z8i3_AsHRiNcug@mail.gmail.com>
Date: Tue, 23 Dec 2025 17:26:02 +0800
From: Kyle Hsieh <kylehsieh1995@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Joel Stanley <joel@....id.au>, 
	Andrew Jeffery <andrew@...econstruct.com.au>, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: dts: aspeed: ventura2: Add Meta ventura2 BMC

On Tue, Dec 23, 2025 at 5:13 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> On Tue, Dec 23, 2025 at 09:49:02AM +0800, 謝政吉 wrote:
> > On Mon, Dec 22, 2025 at 5:30 PM Andrew Lunn <andrew@...n.ch> wrote:
> > >
> > > > +&mdio0 {
> > > > +     status = "okay";
> > > > +};
> > > > +
> > > > +&mac2 {
> > > > +     status = "okay";
> > > > +     phy-mode = "rmii";
> > > > +     pinctrl-names = "default";
> > > > +     pinctrl-0 = <&pinctrl_rmii3_default>;
> > > > +     fixed-link {
> > > > +             speed = <100>;
> > > > +             full-duplex;
> > > > +     };
> > > > +};
> > >
> > > That is an odd combination. You enable the MDIO bus, but don't have
> > > any PHYs on it, no phandles pointing to it. And you have this
> > > fixed-link. It makes me think you have an Ethernet switch on the bus,
> > > and this connects to it?
> > Thanks for the clarification.
> > Yes, there is an Ethernet switch in the design.
> > The MAC is connected to the switch via RMII using a fixed-link
> > configuration.
>
> What make/model of switch is it? Is it unmanaged, or does it use SPI
> or I2C for management?
The switch is connected via RMII to the MAC and is managed over MDIO.
On our board, MDIO is not wired directly to the processor; instead, we
use a USB-to-MPSSE bridge (FT2232) to toggle the MDIO signals for
switch management.
So the MDIO bus in the DTS is not used, and enabling it there was a mistake.
>
>         Andrew
Best Regard,
Kyle Hsieh