linux-kernel - Re: [PATCH] net: phy: Add sysfs attribute for PHY c45 identifiers.

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Message-ID: <ZIc1YJvUCsvX2+0p@shell.armlinux.org.uk>
Date:   Mon, 12 Jun 2023 16:10:24 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Jianhui Zhao <zhaojh329@...il.com>
Cc:     andrew@...n.ch, davem@...emloft.net, edumazet@...gle.com,
        hkallweit1@...il.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com
Subject: Re: [PATCH] net: phy: Add sysfs attribute for PHY c45 identifiers.

On Mon, Jun 12, 2023 at 04:06:32PM +0100, Russell King (Oracle) wrote:
> On Mon, Jun 12, 2023 at 10:04:26PM +0800, Jianhui Zhao wrote:
> > diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> > index 17d0d0555a79..81a4bc043ee2 100644
> > --- a/drivers/net/phy/phy_device.c
> > +++ b/drivers/net/phy/phy_device.c
> > @@ -541,8 +541,10 @@ static int phy_bus_match(struct device *dev, struct device_driver *drv)
> >  
> >  			if ((phydrv->phy_id & phydrv->phy_id_mask) ==
> >  			    (phydev->c45_ids.device_ids[i] &
> > -			     phydrv->phy_id_mask))
> > +			     phydrv->phy_id_mask)) {
> > +				phydev->phy_id = phydev->c45_ids.device_ids[i];
> >  				return 1;
> > +			}
> >  		}
> >  		return 0;
> >  	} else {
> > 
> > How about modifying it like this?
> 
> No - there are C45 PHYs where the ID in each MMD are different. 88x3310
> is one such example. If we're going to report any of them, we should
> report all of them.

The other issue is, this will remain as zero until a driver has
successfully matched the device, which means as far as userspace
knowing what type of PHY it is (to find a driver) this doesn't
improve the situation.

I don't think this is a very good solution.

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