linux-kernel - Re: [PATCH net-next 1/4] net: mdio: Introduce a regmap-based mdio driver

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Date:   Wed, 24 May 2023 20:41:45 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Mark Brown <broonie@...nel.org>, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        alexis.lothore@...tlin.com, thomas.petazzoni@...tlin.com,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Ioana Ciornei <ioana.ciornei@....com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>
Subject: Re: [PATCH net-next 1/4] net: mdio: Introduce a regmap-based mdio
 driver

On Wed, May 24, 2023 at 07:30:51PM +0200, Andrew Lunn wrote:
> > +	mii->name = DRV_NAME;
> > +	strscpy(mii->id, config->name, MII_BUS_ID_SIZE);
> > +	mii->parent = config->parent;
> > +	mii->read = mdio_regmap_read_c22;
> > +	mii->write = mdio_regmap_write_c22;
> 
> Since there is only one valid address on the bus, you can set
> mii->phy_mask to make the scanning of the bus a little faster.

Sorry, I didn't reach this thread yet, I don't have the full context.
Just wanted to add: if the caller knows that there's only a PCS and not
a PHY on this bus, you don't want auto-scanning at all, since that will
create an unconnected phy_device. It would be good if the caller provided
the phy_mask.