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

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Message-ID: <20230525110429.66ba241b@pc-7.home>
Date:   Thu, 25 May 2023 11:04:29 +0200
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Andrew Lunn <andrew@...n.ch>, 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

Hello Vlad, Andrew,

On Wed, 24 May 2023 20:41:45 +0300
Vladimir Oltean <vladimir.oltean@....com> wrote:

> 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.  

Good point, I'll add that.

> 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.

As there can only be one mdiodevice on that bus, and we are already
passing the address of the only available device in struct
mdio_rgmap_config.valid_addr, I guess we can simply add a flag to
indicate if autoscan needs to be enabled or not, and set phy_mask to
either unmask the only valid address, or plain ~0UL if we don't want
autoscan at all.

Thanks both of you for the reviews,

Maxime