linux-kernel - Re: [PATCH v1 1/5] ARM: imx28: add basic dt support

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Message-ID: <20321.37353.63115.664975@ipc1.ka-ro>
Date:	Thu, 15 Mar 2012 07:53:29 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Dong Aisheng <aisheng.dong@...escale.com>
Cc:	"s.hauer\@pengutronix.de" <s.hauer@...gutronix.de>,
	Guo Shawn-R65073 <r65073@...escale.com>,
	"vinod.koul\@linux.intel.com" <vinod.koul@...ux.intel.com>,
	"devicetree-discuss\@lists.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-mmc\@vger.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"rob.herring\@calxeda.com" <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	"rdunlap\@xenotime.net" <rdunlap@...otime.net>,
	"kernel\@pengutronix.de" <kernel@...gutronix.de>,
	"cjb\@laptop.org" <cjb@...top.org>,
	Dong Aisheng-B29396 <B29396@...escale.com>,
	"linux-arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 1/5] ARM: imx28: add basic dt support

Hi,

Dong Aisheng writes:
> On Wed, Mar 14, 2012 at 10:16:43PM +0800, s.hauer@...gutronix.de wrote:
> > On Wed, Mar 14, 2012 at 08:45:23PM +0800, Dong Aisheng wrote:
> > > On Wed, Mar 14, 2012 at 01:23:51AM +0800, Grant Likely wrote:
[...]
> > > But it seems this needs pass mac address to fec driver via platforom data which is
> > > not friendly to dt.
> > > 
> > > Another way may be changing fec driver to get the fixed part of mac address(first
> > > two bytes) from device tree and read the left dynamical part from otp which i'm not
> > > sure is better enough.
> > > 
> > > BTW, filling with zeros seems not work since it's invalid mac address.
> > 
> > Yes, that's the idea of using this value...
> > 
> But comparing to use an invalid value, why not just do not define that
> local-mac-address property?
> 
Because a MAC address is by definition a GLOBALLY UNIQUE IDENTIFIER
which is contrary to coding a "valid" default value for it somewhere!
The owner of a certain MAC address range (OUI) is responsible for
ensuring the uniqueness. Thus only they may assign a specific MAC
address to a specific device.


Lothar Waßmann
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