linux-kernel - Re: [PATCH v3] net: dsa: mv88e6xxx: support RGMII cmode

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Message-ID: <20220825155140.038e4d12@kernel.org>
Date:   Thu, 25 Aug 2022 15:51:40 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Marek Behún <kabel@...nel.org>
Cc:     Marcus Carlberg <marcus.carlberg@...s.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, <kernel@...s.com>,
        Pavana Sharma <pavana.sharma@...i.com>,
        Ashkan Boldaji <ashkan.boldaji@...i.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] net: dsa: mv88e6xxx: support RGMII cmode

On Fri, 26 Aug 2022 00:06:05 +0200 Marek Behún wrote:
> > On Mon, 22 Aug 2022 16:41:36 +0200 Marcus Carlberg wrote:  
> > > Since the probe defaults all interfaces to the highest speed possible
> > > (10GBASE-X in mv88e6393x) before the phy mode configuration from the
> > > devicetree is considered it is currently impossible to use port 0 in
> > > RGMII mode.
> > > 
> > > This change will allow RGMII modes to be configurable for port 0
> > > enabling port 0 to be configured as RGMII as well as serial depending
> > > on configuration.
> > > 
> > > Fixes: de776d0d316f ("net: dsa: mv88e6xxx: add support for mv88e6393x family")
> > > Signed-off-by: Marcus Carlberg <marcus.carlberg@...s.com>    
> > 
> > Seems like a new configuration which was not previously supported
> > rather than a regression, right? If so I'll drop the Fixes tag
> > when applying.  
> 
> Please leave the fixes tag. This configuration should have been
> supported from the beginning.

Could you explain why? Is there an upstream-supported platform
already in Linus's tree which doesn't boot or something?