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Date:   Sat, 14 Aug 2021 17:26:55 +0200
From:   Andrew Lunn <andrew@lunn.ch>
To:     Tao Ren <rentao.bupt@gmail.com>
Cc:     Joel Stanley <joel@jms.id.au>, Rob Herring <robh+dt@kernel.org>,
        Andrew Jeffery <andrew@aj.id.au>,
        devicetree <devicetree@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        linux-aspeed <linux-aspeed@lists.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        OpenBMC Maillist <openbmc@lists.ozlabs.org>,
        Tao Ren <taoren@fb.com>
Subject: Re: [PATCH v2 4/6] ARM: dts: aspeed: Add Facebook Cloudripper
 (AST2600) BMC
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> Thanks for jumping in. We are using BCM5389 and the MDIO bus is used to
> access BCM5389 MDC/MDIO interface in Pseudo-PHY mode.
> 
> I didn't know drivers/net/dsa, but let me check out the drivers and see
> if it works in the Cloudripper environment.

The b53 driver knows about this switch, so please make use of that
driver. See Documentation/devicetree/bindings/net/dsa/brcm,b53.yaml
for how you describe it in DT.

    Andrew