linux-kernel - Re: [PATCH 1/2] net/smscx5xx: use the device tree for mac address

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Date:	Wed, 03 Feb 2016 16:42:02 +0100
From:	Lubomir Rintel <lkundrak@...sk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-rpi-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>,
	Lee Jones <lee@...nel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Peter Chen <peter.chen@...escale.com>
Subject: Re: [PATCH 1/2] net/smscx5xx: use the device tree for mac address

On Wed, 2016-02-03 at 16:23 +0100, Arnd Bergmann wrote:
> On Wednesday 03 February 2016 16:02:38 Lubomir Rintel wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> > 
> > This takes the MAC address for smsc75xx/smsc95xx USB network
> > devices
> > from a the device tree. This is required to get a usable persistent
> > address on the popular beagleboard, whose hardware designers
> > accidentally forgot that an ethernet device really requires an a
> > MAC address to be functional.
> > 
> > The smsc75xx and smsc95xx drivers are just two copies of the
> > same code, so better fix both.
> > 
> > Tested-by: Lubomir Rintel <lkundrak@...sk>
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > 
> 
> I have no memory of writing this patch, where did you find it?

2011's discussion: https://lkml.org/lkml/2011/3/17/416
(Link also in the cover letter).

> The changelog sounds like I wrote it, so I assume it was me after
> all.
> 
> > +       address = of_get_property(dev->udev->dev.of_node,
> > +                                 "local-mac-address", NULL);
> > +       if (address) {
> > +               memcpy(dev->net->dev_addr, address, ETH_ALEN);
> > +               return;
> > +       }
> 
> This should use of_get_mac_address(), not an open-coded property
> lookup. The function was probably added after I wrote the
> the original patch.

Okay. Will fix that up once I get feedback for the devicetree part.

> 	Arnd

Thanks,
Lubo