linux-kernel - Re: [PATCH 1/2] gpio: mcp23s08: rename the device tree property

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Date:	Fri, 23 Aug 2013 17:22:10 +0200
From:	Lars Poeschel <poeschel@...onage.de>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Lars Poeschel <larsi@....tu-dresden.de>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"arnd@...db.de" <arnd@...db.de>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 1/2] gpio: mcp23s08: rename the device tree property

On Friday 23 August 2013 at 16:24:21, Mark Rutland wrote:
> On Thu, Aug 22, 2013 at 10:56:17AM +0100, Lars Poeschel wrote:
> > From: Lars Poeschel <poeschel@...onage.de>
> > 
> > The device tree property should be more descriptive.
> > microchip seems more reasonable than mcp. As there are no
> > in tree users of this property, so the rename can still be
> > done without pain.
> 
> Are there definitely no users? I see there are no dts with a
> "mcp,mcp23***" compatible string, but are there any boards already out
> there with this hardware that someone might be using and a currently
> release kernel supports?

What do you mean by "release"? The device tree support for the gpio-
mcp23s08 driver and thus the "mcp" string came in with v3.9. This is stable 
but not longterm.

> With the bcm/broadcom => brcm change, we marked the old vendor prefix as
> deprecated (but left the support code).
> 
> If we can 100% guarantee no-one's using the compatible string, I'm happy
> to change it. Otherwise we just have to mark the old string as
> deprecated.

I am the developer of the device tree support for that driver and I am not 
aware of any user, but surely I can not guarantee it.

I never imagined how hard it would be. ;-)
I presented both variants:
1.) simply add mcp to vendor-prefixes.txt
2.) change the driver to microchip and add microchip to vendor-prefixes.txt

May one of the maintainers decide which one to take or even take none of 
the patches.
Or do you need a third variant with both strings in the driver and 
microchip in vendor-prefixes?

Lars
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