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From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
To: Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
	Shiraz Hashim <shiraz.hashim-qxv4g6HH51o@public.gmane.org>,
	Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>,
	linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Haojian Zhuang
	<haojian.zhuang-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Jingchang Lu <b35083-KZfg59tc24xl57MIdRCFDg@public.gmane.org>,
	devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH V2 5/5] ARM: remove #gpio-ranges-cells property
Date: Tue, 16 Jul 2013 17:30:23 -0600	[thread overview]
Message-ID: <51E5D78F.8060400@wwwdotorg.org> (raw)
In-Reply-To: <51E47F85.4050905-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>

On 07/15/2013 05:02 PM, Stephen Warren wrote:
> On 07/15/2013 01:34 PM, Rob Herring wrote:
>> On 07/15/2013 01:40 PM, Stephen Warren wrote:
>>> From: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>>>
>>> This property is no longer required by the GPIO binding. Remove it.
>>
>> Won't this break compatibility with older kernel? It is one thing to
>> deprecate, but removal is another. If the relevant maintainers don't
>> care, then I guess it is fine.
> 
> Yes.
> 
> I had originally hoped this could sneak in late for 3.11, but I suppose
> it's too late now. vf610.dtsi is a new file in 3.11 so has no legacy to
> protect.
> 
> Admittedly, the #gpio-cells property was added into the SPEAr files in 3.10.

One more thought here:

I know DT bindings are supposed to evolve so that a new kernel will
support arbitrary old DTs. I'll call that backwards-compatibility for
the DT parsing code.

However, this situation is the reverse; this patch would prevent a new
DT running on an older kernel. I'll call that forwards-compatibility.
I'm not sure if the intent is to support this or not? It's certainly the
first I explicitly thought about compatibility in this direction...

  parent reply	other threads:[~2013-07-16 23:30 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-15 18:40 [PATCH V2 1/5] gpio: clean up gpio-ranges documentation Stephen Warren
2013-07-15 18:40 ` [PATCH V2 4/5] gpio: implement gpio-ranges binding document fix Stephen Warren
     [not found] ` <1373913629-32179-1-git-send-email-swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-07-15 18:40   ` [PATCH V2 2/5] of: move documentation of of_parse_phandle_with_args Stephen Warren
2013-07-15 18:40   ` [PATCH V2 3/5] of: introduce of_parse_phandle_with_fixed_args Stephen Warren
2013-07-15 18:59     ` Sergei Shtylyov
     [not found]       ` <51E44688.3050805-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@public.gmane.org>
2013-07-15 23:06         ` Stephen Warren
2013-07-15 18:40   ` [PATCH V2 5/5] ARM: remove #gpio-ranges-cells property Stephen Warren
     [not found]     ` <1373913629-32179-5-git-send-email-swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-07-15 19:34       ` Rob Herring
     [not found]         ` <51E44ED9.9020807-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-07-15 23:02           ` Stephen Warren
     [not found]             ` <51E47F85.4050905-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-07-16 23:30               ` Stephen Warren [this message]
     [not found]                 ` <51E5D78F.8060400-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-07-17  1:50                   ` Rob Herring
     [not found]                     ` <CAL_JsqJ7CYUieGbvAZtQDEYsUKdM3yYBHSu871jUqOLeASc08g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-17  2:58                       ` Stephen Warren
2013-07-18  1:35       ` Laurent Pinchart
2013-07-22 22:31 ` [PATCH V2 1/5] gpio: clean up gpio-ranges documentation Linus Walleij
2013-07-23 16:14   ` Stephen Warren

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