netdev - Re: [PATCH RFC net-next 11/12] net: dsa: sja1105: convert to phylink_generic

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Message-ID: <YZ6p0V0ZOEJLhgEH@shell.armlinux.org.uk>
Date:   Wed, 24 Nov 2021 21:08:33 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        George McCollister <george.mccollister@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH RFC net-next 11/12] net: dsa: sja1105: convert to
 phylink_generic_validate()

On Wed, Nov 24, 2021 at 07:53:40PM +0000, Vladimir Oltean wrote:
> On Wed, Nov 24, 2021 at 05:53:19PM +0000, Russell King (Oracle) wrote:
> > Populate the supported interfaces and MAC capabilities for the SJA1105
> > DSA switch and remove the old validate implementation to allow DSA to
> > use phylink_generic_validate() for this switch driver.
> > 
> > This switch only supports a static model of configuration, so we
> > restrict the interface modes to the configured setting, and pass the
> > MAC capabilities. As it is unclear which interface modes support 1G
> > speeds, we keep the setting of MAC_1000FD conditional on the configured
> > interface mode.
> > 
> > Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> > ---
> 
> Please use this patch for sja1105. Thanks.

Your patch is combining two changes into one patch. Specifically, the
there are two logical changes in your patch:

1) changing the existing behaviour of the validate() function by
allowing switching between PHY_INTERFACE_MODE_SGMII and
PHY_INTERFACE_MODE_2500BASEX, which was not permitted before with the
sja1105_phy_mode_mismatch() check.

2) converting to supported_interfaces / mac_capabilities way of defining
what is supported.

Combining the two changes makes the patch harder to review, and it
becomes less obvious that it is actually correct. I would recommend
changing the existing behaviour prior to the conversion, but ultimately
that is your decision.

For more information please see the "Separate your changes" section in
Documentation/process/submitting-patches.rst

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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