linux-kernel - Re: are device names part of sysfs ABI? (was Re: devicename part of LEDs under ethernet MAC / PHY)

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Message-ID: <20211004073841.GA20163@amd>
Date:   Mon, 4 Oct 2021 09:38:41 +0200
From:   Pavel Machek <pavel@....cz>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Marek Behún <kabel@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        "linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
        netdev@...r.kernel.org,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: are device names part of sysfs ABI? (was Re: devicename part of
 LEDs under ethernet MAC / PHY)

Hi!

> > > > Are device names (as returned by dev_name() function) also part of
> > > > sysfs ABI? Should these names be stable across reboots / kernel
> > > > upgrades?  
> > > 
> > > Stable in what exact way?
> > 
> > Example:
> > - Board has an ethernet PHYs that is described in DT, and therefore
> >   has stable sysfs path (derived from DT path), something like
> >     /sys/devices/.../mdio_bus/f1072004.mdio-mii/f1072004.mdio-mii:01
> 
> None of the numbers there are "stable", right?

At least f1072004 part is stable (and probably whole path). DT has
advantages here, and we should provide stable paths when we can.

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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