netdev - Re: [PATCH v3 net-next 05/10] net: dsa: microchip: add DSA support for microchip lan937x

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Message-ID: <20210811202019.seskua7bzagxis7u@skbuf>
Date:   Wed, 11 Aug 2021 23:20:19 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>,
        netdev@...r.kernel.org, robh+dt@...nel.org,
        UNGLinuxDriver@...rochip.com, Woojung.Huh@...rochip.com,
        hkallweit1@...il.com, davem@...emloft.net, kuba@...nel.org,
        linux-kernel@...r.kernel.org, vivien.didelot@...il.com,
        f.fainelli@...il.com, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 net-next 05/10] net: dsa: microchip: add DSA support
 for microchip lan937x

On Wed, Aug 11, 2021 at 09:14:14PM +0100, Russell King (Oracle) wrote:
> On Wed, Aug 11, 2021 at 08:23:04PM +0200, Andrew Lunn wrote:
> > > I hope that using "*-internal-delay-ps" for Mac would be the right option.
> > > Shall i include these changes as we discussed in next revision of the patch? 
> > 
> > Yes, that seems sensible. But please limit them to the CPU port. Maybe
> > return -EINVAL for other ports.
> 
> Hmm. Don't we want ports that are "MAC like" to behave "MAC like" ?
> In other words, shouldn't a DSA port that can be connected to an
> external PHY should accept the same properties as a conventional
> Ethernet MAC e.g. in a SoC device?

+1, I thought the whole purpose of the discussion was to stop singling
out the CPU port as being special in any way w.r.t. RGMII delays.