linux-kernel - Re: [PATCH] arm64: dts: marvell: espressobin: Add ethernet switch aliases

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Message-ID: <20200907145213.fwlyz4k6scible7x@pali>
Date:   Mon, 7 Sep 2020 16:52:13 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Jason Cooper <jason@...edaemon.net>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Tomasz Maciej Nowak <tmn505@...il.com>,
        Andre Heider <a.heider@...il.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: marvell: espressobin: Add ethernet switch
 aliases

On Monday 07 September 2020 16:42:28 Andrew Lunn wrote:
> On Mon, Sep 07, 2020 at 01:27:17PM +0200, Pali Rohár wrote:
> > Espressobin boards have 3 ethernet ports and some of them got assigned more
> > then one MAC address. MAC addresses are stored in U-Boot environment.
> > 
> > Since commit a2c7023f7075c ("net: dsa: read mac address from DT for slave
> > device") kernel can use MAC addresses from DT for particular DSA port.
> > 
> > Currently Espressobin DTS file contains alias just for ethernet0.
> > 
> > This patch defines additional ethernet aliases in Espressobin DTS files, so
> > bootloader can fill correct MAC address for DSA switch ports if more MAC
> > addresses were specified.
> > 
> > DT alias ethernet1 is used for wan port, DT aliases ethernet2 and ethernet3
> > are used for lan ports for both Espressobin revisions (V5 and V7).
> > 
> > Fixes: 5253cb8c00a6f ("arm64: dts: marvell: espressobin: add ethernet alias")
> > Signed-off-by: Pali Rohár <pali@...nel.org>
> 
> I'm not sure a Fixes: is appropriate here. What is actually broken?
> This just seems like a new feature.

Hello Andrew! With "fixes" I mean that this patch fixes aliases list in
that mentioned commit as it was incomplete. Probably better would be
"related" or "extended" keyword in this case. But I do not know.

I would not say it is a "new feature". But rather that patch in this
email fixes issue that Linux kernel did not set correct MAC address for
DSA slave ports. I think it is something which could be backported also
to stable releases as "ignoring" vendor/factory MAC address is not
correct behavior.

If you have an idea how to reformulate commit description I will do it.