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From: Brian Norris <computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: "Rafał Miłecki" <zajec5-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	"linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Ezequiel Garcia
	<ezequiel.garcia-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
	Marek Vasut <marex-ynQEQJNshbs@public.gmane.org>
Subject: Re: [PATCH 1/2] Documentation: devicetree: m25p80: add "nor-jedec" binding
Date: Tue, 24 Mar 2015 17:55:34 -0700	[thread overview]
Message-ID: <20150325005534.GC2677@norris-Latitude-E6410> (raw)
In-Reply-To: <CACna6ryvD2Dn2eQPMvoJ+1Yt75=w1J6OR=tvOSZsMsBgD2O4yg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On Sun, Mar 22, 2015 at 12:30:05AM +0100, Rafał Miłecki wrote:
> On 20 March 2015 at 20:12, Brian Norris <computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > Yes, and that is an eventual goal I suppose, but the current list is
> > excessive and is most likely not currently relied on by any one. So I
> > don't just want to C&P the entire list into this binding immediately.
> >
> > I guess my plan looks like this:
> >
> > 1. add "nor-jedec" binding, to provide lowest common denominator binding
> > (this series)
> >
> > 2. stop adding to the m25p_ids[] table unless necessary (enabled by this
> > series)
> >
> > 3. gauge whether we can remove certain entries from m25p_ids[] (e.g., if
> > they were only used in platform_data, not DT; or if they were very
> > recently added just to synchronize with spi-nor.c)
> 
> Why we can't remove (slowly) all entries from m25p_ids that don't need
> any extra handling?
> 
> If we'll have DT with
> "spansion,m25p80", "nor-jedec"
> and then m25p80.c will handle both: "m25p80" and "nor-jedec" without
> any difference, what's the point of keeping "m25p80" entry?

ABI stability. A lot of DTBs might be using m25p80 already, and they
aren't supposed to have to update just because SW decided to drop them.
But see [1] for the official word on ABI stability. I think that leaves
room for removing most/all of these eventually.

Brian

[1] Documentation/devicetree/bindings/ABI.txt
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WARNING: multiple messages have this Message-ID (diff)
From: Brian Norris <computersforpeace@gmail.com>
To: "Rafał Miłecki" <zajec5@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	Marek Vasut <marex@denx.de>,
	"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
	Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Subject: Re: [PATCH 1/2] Documentation: devicetree: m25p80: add "nor-jedec" binding
Date: Tue, 24 Mar 2015 17:55:34 -0700	[thread overview]
Message-ID: <20150325005534.GC2677@norris-Latitude-E6410> (raw)
In-Reply-To: <CACna6ryvD2Dn2eQPMvoJ+1Yt75=w1J6OR=tvOSZsMsBgD2O4yg@mail.gmail.com>

On Sun, Mar 22, 2015 at 12:30:05AM +0100, Rafał Miłecki wrote:
> On 20 March 2015 at 20:12, Brian Norris <computersforpeace@gmail.com> wrote:
> > Yes, and that is an eventual goal I suppose, but the current list is
> > excessive and is most likely not currently relied on by any one. So I
> > don't just want to C&P the entire list into this binding immediately.
> >
> > I guess my plan looks like this:
> >
> > 1. add "nor-jedec" binding, to provide lowest common denominator binding
> > (this series)
> >
> > 2. stop adding to the m25p_ids[] table unless necessary (enabled by this
> > series)
> >
> > 3. gauge whether we can remove certain entries from m25p_ids[] (e.g., if
> > they were only used in platform_data, not DT; or if they were very
> > recently added just to synchronize with spi-nor.c)
> 
> Why we can't remove (slowly) all entries from m25p_ids that don't need
> any extra handling?
> 
> If we'll have DT with
> "spansion,m25p80", "nor-jedec"
> and then m25p80.c will handle both: "m25p80" and "nor-jedec" without
> any difference, what's the point of keeping "m25p80" entry?

ABI stability. A lot of DTBs might be using m25p80 already, and they
aren't supposed to have to update just because SW decided to drop them.
But see [1] for the official word on ABI stability. I think that leaves
room for removing most/all of these eventually.

Brian

[1] Documentation/devicetree/bindings/ABI.txt

  parent reply	other threads:[~2015-03-25  0:55 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-11 21:57 [PATCH 1/2] Documentation: devicetree: m25p80: add "nor-jedec" binding Brian Norris
2015-03-11 21:57 ` Brian Norris
     [not found] ` <1426111046-29900-1-git-send-email-computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-03-11 21:57   ` [PATCH 2/2] mtd: m25p80: bind to "nor-jedec" ID, for auto-detection Brian Norris
2015-03-11 21:57     ` Brian Norris
2015-03-11 22:22   ` [PATCH 1/2] Documentation: devicetree: m25p80: add "nor-jedec" binding Marek Vasut
2015-03-11 22:22     ` Marek Vasut
     [not found]     ` <201503112322.46491.marex-ynQEQJNshbs@public.gmane.org>
2015-03-11 22:46       ` Brian Norris
2015-03-11 22:46         ` Brian Norris
2015-03-12 10:19   ` Geert Uytterhoeven
2015-03-12 10:19     ` Geert Uytterhoeven
     [not found]     ` <CAMuHMdUv2w0chGPK37oYaY5f64X4XK+Ab+aP7egxv2fnWa8k-g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-03-12 10:36       ` Rafał Miłecki
2015-03-12 10:36         ` Rafał Miłecki
     [not found]         ` <CACna6rz-4nKE_iV2-8aG3ZEcrpN88A0iX4cHC+FudJ-==H9p7w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-03-12 10:40           ` Geert Uytterhoeven
2015-03-12 10:40             ` Geert Uytterhoeven
2015-03-12 10:53           ` Mark Rutland
2015-03-12 10:53             ` Mark Rutland
2015-03-20 19:02             ` Brian Norris
2015-03-20 19:02               ` Brian Norris
2015-03-12 10:58   ` Mark Rutland
2015-03-12 10:58     ` Mark Rutland
2015-03-20 19:12     ` Brian Norris
2015-03-20 19:12       ` Brian Norris
2015-03-21 23:30       ` Rafał Miłecki
2015-03-21 23:30         ` Rafał Miłecki
     [not found]         ` <CACna6ryvD2Dn2eQPMvoJ+1Yt75=w1J6OR=tvOSZsMsBgD2O4yg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-03-25  0:55           ` Brian Norris [this message]
2015-03-25  0:55             ` Brian Norris

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