linux-kernel - Re: [PATCH v2 4/6] ARM: dts: aspeed: Add Facebook Cloudripper (AST2600) BMC

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Message-ID: <YRaFpq1LvRzMYr/A@lunn.ch>
Date:   Fri, 13 Aug 2021 16:45:58 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Tao Ren <rentao.bupt@...il.com>
Cc:     Joel Stanley <joel@....id.au>, Rob Herring <robh+dt@...nel.org>,
        Andrew Jeffery <andrew@...id.au>,
        devicetree <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Tao Ren <taoren@...com>
Subject: Re: [PATCH v2 4/6] ARM: dts: aspeed: Add Facebook Cloudripper
 (AST2600) BMC

On Thu, Aug 12, 2021 at 08:40:17PM -0700, Tao Ren wrote:
> On Fri, Aug 13, 2021 at 01:29:17AM +0000, Joel Stanley wrote:
> > On Thu, 5 Aug 2021 at 22:28, <rentao.bupt@...il.com> wrote:
> > > +&mdio1 {
> > > +       status = "okay";
> > 
> > You're enabling this but it looks like it's unused?
> 
> Thanks Joel for the careful review. The MDIO controller is not paired
> with BMC MAC; instead, it's connected to the MDC/MDIO interface of the
> on-board switch (whose ports are connected to BMC, Host and front panel
> management port).

What switch is it? Is there a DSA driver for it? drivers/net/dsa/*
Ideally you want Linux to be controlling the switch, in the standard
linux way.

     Andrew