linux-kernel - Re: [PATCH V3 1/3] dts: change Marvell prefix to 'marvell'

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Date:	Fri, 12 Jul 2013 12:14:23 -0400
From:	Jason Cooper <jason@...edaemon.net>
To:	Daniel Drake <dsd@...top.org>
Cc:	Haojian Zhuang <haojian.zhuang@...il.com>,
	Bergmann Arnd <arnd@...db.de>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Neil Zhang <zhangwm@...vell.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V3 1/3] dts: change Marvell prefix to 'marvell'

On Fri, Jul 12, 2013 at 10:05:45AM -0600, Daniel Drake wrote:
> On Fri, Jul 12, 2013 at 9:57 AM, Jason Cooper <jason@...edaemon.net> wrote:
> > This also means we should do a patch for stable v3.5+ appending the
> > "mrvl,..." string to the drivers that had it removed improperly, as
> > Daniel discovered.  Daniel, since you are probably most familiar (and
> > most able to test ;-) ), would you mind putting that patch together?
> 
> I will look at that. There was another case of a quiet mrvl->marvell
> conversion that bit us around a year ago as well, so I will dig that
> up too for consideration.

Ok, thanks.

> > So we don't have to keep it around forever, we could do as Arnd has
> > suggested in the past (for an entirely different problem):
> >
> >         /* assuming it goes in for v3.12 */
> >         if (WARN_ON(of_device_is_compatible(dev, "mrvl,..."))) {
> >                 dev_info(&dev->dev, "compatible string \"mrvl,...\" being removed in v3.15\n");
> >                 BUG_ON(LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0));
> >         }
> >
> > * I can't find where Arnd's suggestion was, so this hack is completely
> > my own.
> >
> > Keep in mind, the above hack is just a suggestion, it makes my skin
> > crawl just looking at it... I'm open to other ideas.  Or, not doing it
> > at all.
> 
> A new OpenFirmware or dtb file would want to keep the old mrvl
> compatible string around in order to have compatibility with old
> kernels. So I think that hack would have to be extended to "if device
> is compatible with mrvl, but not marvell, then warn". And that seems
> so ugly that my vote would be to avoid it. Especially while we don't
> know of existing users who have a requirement of stability.

whew!  Ok, drop that idea.

thx,

Jason.
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