From: Rob Herring <robherring2@gmail.com> To: Olof Johansson <olof@lixom.net> Cc: Mark Brown <broonie@kernel.org>, Richard Cochran <richardcochran@gmail.com>, Mark Rutland <mark.rutland@arm.com>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, "ksummit-2013-discuss@lists.linuxfoundation.org" <ksummit-2013-discuss@lists.linuxfoundation.org>, Russell King - ARM Linux <linux@arm.linux.org.uk>, Ian Campbell <ian.campbell@citrix.com>, Pawel Moll <Pawel.Moll@arm.com>, Stephen Warren <swarren@wwwdotorg.org>, Domenico Andreoli <cavokz@gmail.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Jason Gunthorpe <jgunthorpe@obsidianresearch.com>, Dave P Martin <Dave.Martin@arm.com>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org> Subject: Re: [Ksummit-2013-discuss] DT bindings as ABI [was: Do we have people interested in device tree janitoring / cleanup?] Date: Fri, 26 Jul 2013 11:36:13 -0500 [thread overview] Message-ID: <51F2A57D.1090704@gmail.com> (raw) In-Reply-To: <CAOesGMhEr3DiFm5uSgoHPFUMY4jWu4HkeTU2UmOGj=dS75Vk+g@mail.gmail.com> On 07/26/2013 10:49 AM, Olof Johansson wrote: > On Fri, Jul 26, 2013 at 7:10 AM, Mark Brown <broonie@kernel.org> wrote: >> On Fri, Jul 26, 2013 at 03:09:29PM +0200, Richard Cochran wrote: >> >>> Unless I totally misunderstood, the thread is talking about letting >>> established bindings change with each new kernel version. I am >>> opposed to that. >> >> No, nobody is really saying that is a particularly good idea. There is >> some debate about how we work out what an established binding is but >> there's no serious suggestion that we don't want stable bindings. > > Yes, what Mark said -- _today_ all bindings are subject to change and > can be changed in lockstep with the kernel. This has been necessary as > part of development to sort out all of the various bootstrapping > issues across platforms. This is absolutely not true on a global basis. Any binding used on powerpc or sparc is not subject to change. Furthermore, there are ARM platforms such as highbank where the bindings are expected to be stable. That's not saying they don't change (new properties for SATA just today), but they only change in a backwards compatible way. Rob > > What we're talking about is to end that mode of operation, and moving > over to locking in bindings. Device tree contents, as mentioned > elsewhere, might still be changed just like code is -- bugs are fixed, > etc. But it's time to start locking down the bindings, in particular > no longer change the established ones. > > Long term, final goal is likely to be close to what Russell is saying > -- nothing should go into the kernel tree unless the binding is in a > fully stable state. However, we have a transitional period between now > and then, and even when we're at the final state there will be need to > have some sort of sandbox for development and test of future bindings. > Dealing with all that, as well as the actual process for locking in > bindings, is what needs to be sorted out. > > I think we're all in agreement that bindings that change over time are > nothing but pain, but we're arguing that in circles anyway. > > > -Olof >
WARNING: multiple messages have this Message-ID (diff)
From: robherring2@gmail.com (Rob Herring) To: linux-arm-kernel@lists.infradead.org Subject: [Ksummit-2013-discuss] DT bindings as ABI [was: Do we have people interested in device tree janitoring / cleanup?] Date: Fri, 26 Jul 2013 11:36:13 -0500 [thread overview] Message-ID: <51F2A57D.1090704@gmail.com> (raw) In-Reply-To: <CAOesGMhEr3DiFm5uSgoHPFUMY4jWu4HkeTU2UmOGj=dS75Vk+g@mail.gmail.com> On 07/26/2013 10:49 AM, Olof Johansson wrote: > On Fri, Jul 26, 2013 at 7:10 AM, Mark Brown <broonie@kernel.org> wrote: >> On Fri, Jul 26, 2013 at 03:09:29PM +0200, Richard Cochran wrote: >> >>> Unless I totally misunderstood, the thread is talking about letting >>> established bindings change with each new kernel version. I am >>> opposed to that. >> >> No, nobody is really saying that is a particularly good idea. There is >> some debate about how we work out what an established binding is but >> there's no serious suggestion that we don't want stable bindings. > > Yes, what Mark said -- _today_ all bindings are subject to change and > can be changed in lockstep with the kernel. This has been necessary as > part of development to sort out all of the various bootstrapping > issues across platforms. This is absolutely not true on a global basis. Any binding used on powerpc or sparc is not subject to change. Furthermore, there are ARM platforms such as highbank where the bindings are expected to be stable. That's not saying they don't change (new properties for SATA just today), but they only change in a backwards compatible way. Rob > > What we're talking about is to end that mode of operation, and moving > over to locking in bindings. Device tree contents, as mentioned > elsewhere, might still be changed just like code is -- bugs are fixed, > etc. But it's time to start locking down the bindings, in particular > no longer change the established ones. > > Long term, final goal is likely to be close to what Russell is saying > -- nothing should go into the kernel tree unless the binding is in a > fully stable state. However, we have a transitional period between now > and then, and even when we're at the final state there will be need to > have some sort of sandbox for development and test of future bindings. > Dealing with all that, as well as the actual process for locking in > bindings, is what needs to be sorted out. > > I think we're all in agreement that bindings that change over time are > nothing but pain, but we're arguing that in circles anyway. > > > -Olof >
next prev parent reply other threads:[~2013-07-26 16:36 UTC|newest] Thread overview: 284+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-07-25 16:09 DT bindings as ABI [was: Do we have people interested in device tree janitoring / cleanup?] Olof Johansson 2013-07-25 16:09 ` Olof Johansson 2013-07-25 17:57 ` Mark Rutland 2013-07-25 17:57 ` Mark Rutland 2013-07-25 18:05 ` Stephen Warren 2013-07-25 18:05 ` Stephen Warren 2013-07-25 18:25 ` Olof Johansson 2013-07-25 18:25 ` Olof Johansson 2013-07-25 18:50 ` Stephen Warren 2013-07-25 18:50 ` Stephen Warren 2013-07-25 19:30 ` [Ksummit-2013-discuss] " Mark Brown 2013-07-25 19:30 ` Mark Brown 2013-07-25 18:29 ` Mark Rutland 2013-07-25 18:29 ` Mark Rutland 2013-07-25 18:48 ` Richard Cochran 2013-07-25 18:48 ` Richard Cochran 2013-07-25 18:53 ` Stephen Warren 2013-07-25 18:53 ` Stephen Warren 2013-07-25 21:41 ` Domenico Andreoli 2013-07-25 21:41 ` Domenico Andreoli 2013-07-26 4:43 ` Richard Cochran 2013-07-26 4:43 ` Richard Cochran 2013-07-25 21:37 ` Jason Gunthorpe 2013-07-25 21:37 ` Jason Gunthorpe 2013-07-26 4:54 ` Richard Cochran 2013-07-26 4:54 ` Richard Cochran 2013-07-26 13:42 ` Rob Herring 2013-07-26 13:42 ` Rob Herring 2013-07-26 17:15 ` Jason Gunthorpe 2013-07-26 17:15 ` Jason Gunthorpe 2013-07-27 8:48 ` Richard Cochran 2013-07-27 8:48 ` Richard Cochran 2013-07-27 10:40 ` [Ksummit-2013-discuss] " Mark Brown 2013-07-27 10:40 ` Mark Brown 2013-07-27 17:37 ` Richard Cochran 2013-07-27 17:37 ` Richard Cochran 2013-07-27 17:57 ` David Lang 2013-07-27 17:57 ` David Lang 2013-07-27 18:17 ` Richard Cochran 2013-07-27 18:17 ` Richard Cochran 2013-07-28 11:27 ` Mark Brown 2013-07-28 11:27 ` Mark Brown 2013-07-29 17:54 ` Jason Gunthorpe 2013-07-29 17:54 ` Jason Gunthorpe 2013-07-29 18:16 ` Russell King - ARM Linux 2013-07-29 18:16 ` Russell King - ARM Linux 2013-07-29 18:40 ` Jason Gunthorpe 2013-07-29 18:40 ` Jason Gunthorpe 2013-07-27 8:53 ` Richard Cochran 2013-07-27 8:53 ` Richard Cochran 2013-07-27 10:20 ` Tomasz Figa 2013-07-27 10:20 ` Tomasz Figa 2013-07-27 11:36 ` [Ksummit-2013-discuss] " Mark Brown 2013-07-27 11:36 ` Mark Brown 2013-07-27 18:07 ` Richard Cochran 2013-07-27 18:07 ` Richard Cochran 2013-07-28 12:10 ` Mark Brown 2013-07-28 12:10 ` Mark Brown 2013-07-26 8:01 ` Richard Cochran 2013-07-26 8:01 ` Richard Cochran 2013-07-26 9:42 ` [Ksummit-2013-discuss] " David Woodhouse 2013-07-26 9:42 ` David Woodhouse 2013-07-26 13:09 ` Richard Cochran 2013-07-26 13:09 ` Richard Cochran 2013-07-26 13:14 ` Russell King - ARM Linux 2013-07-26 13:14 ` Russell King - ARM Linux 2013-07-27 15:28 ` David Gibson 2013-07-27 15:28 ` David Gibson 2013-07-26 13:27 ` Jason Cooper 2013-07-26 13:27 ` Jason Cooper 2013-07-26 13:38 ` Russell King - ARM Linux 2013-07-26 13:38 ` Russell King - ARM Linux 2013-07-26 13:45 ` Jason Cooper 2013-07-26 13:45 ` Jason Cooper 2013-07-26 13:50 ` David Woodhouse 2013-07-26 13:50 ` David Woodhouse 2013-07-26 13:59 ` Jason Cooper 2013-07-26 13:59 ` Jason Cooper 2013-07-26 13:41 ` David Woodhouse 2013-07-26 13:41 ` David Woodhouse 2013-07-26 13:47 ` Jason Cooper 2013-07-26 13:47 ` Jason Cooper 2013-07-26 14:14 ` jonsmirl 2013-07-26 14:14 ` jonsmirl at gmail.com 2013-07-26 14:16 ` David Woodhouse 2013-07-26 14:16 ` David Woodhouse 2013-07-26 14:21 ` Russell King - ARM Linux 2013-07-26 14:21 ` Russell King - ARM Linux 2013-07-26 14:39 ` jonsmirl 2013-07-26 14:39 ` jonsmirl at gmail.com 2013-07-26 14:40 ` Mark Brown 2013-07-26 14:40 ` Mark Brown 2013-07-29 15:32 ` Matt Porter 2013-07-29 15:32 ` Matt Porter 2013-07-27 15:19 ` David Gibson 2013-07-27 15:19 ` David Gibson 2013-07-27 19:37 ` Grant Likely 2013-07-27 19:37 ` Grant Likely 2013-07-27 9:16 ` Ming Lei 2013-07-27 9:16 ` Ming Lei 2013-07-26 14:10 ` Mark Brown 2013-07-26 14:10 ` Mark Brown 2013-07-26 15:49 ` Olof Johansson 2013-07-26 15:49 ` Olof Johansson 2013-07-26 16:36 ` Rob Herring [this message] 2013-07-26 16:36 ` Rob Herring 2013-07-27 4:57 ` Richard Cochran 2013-07-27 4:57 ` Richard Cochran 2013-07-27 5:04 ` Richard Cochran 2013-07-27 5:04 ` Richard Cochran 2013-07-27 9:51 ` Tomasz Figa 2013-07-27 9:51 ` Tomasz Figa 2013-07-27 10:24 ` Arend van Spriel 2013-07-27 10:24 ` Arend van Spriel 2013-07-27 10:34 ` Arend van Spriel 2013-07-27 10:34 ` Arend van Spriel 2013-07-27 11:09 ` Russell King - ARM Linux 2013-07-27 11:09 ` Russell King - ARM Linux 2013-07-27 10:36 ` Tomasz Figa 2013-07-27 10:36 ` Tomasz Figa 2013-07-27 10:59 ` Arend van Spriel 2013-07-27 10:59 ` Arend van Spriel 2013-07-27 19:45 ` Grant Likely 2013-07-27 19:45 ` Grant Likely 2013-07-27 20:01 ` jonsmirl 2013-07-27 20:01 ` jonsmirl at gmail.com 2013-07-27 20:03 ` David Woodhouse 2013-07-27 20:03 ` David Woodhouse 2013-07-27 20:25 ` Grant Likely 2013-07-27 20:25 ` Grant Likely 2013-07-28 3:28 ` Grant Likely 2013-07-28 3:28 ` Grant Likely 2013-07-28 5:11 ` James Bottomley 2013-07-28 5:11 ` James Bottomley 2013-07-28 5:13 ` Grant Likely 2013-07-28 5:13 ` Grant Likely 2013-07-30 1:44 ` David Gibson 2013-07-30 1:44 ` David Gibson 2013-07-30 2:15 ` jonsmirl 2013-07-30 2:15 ` jonsmirl at gmail.com 2013-07-30 3:29 ` David Gibson 2013-07-30 3:29 ` David Gibson 2013-07-30 4:35 ` Grant Likely 2013-07-30 4:35 ` Grant Likely 2013-07-30 8:39 ` Maxime Ripard 2013-07-30 8:39 ` Maxime Ripard 2013-07-30 16:30 ` Stephen Warren 2013-07-30 16:30 ` Stephen Warren 2013-07-30 17:27 ` John W. Linville 2013-07-30 17:27 ` John W. Linville 2013-07-30 16:40 ` Stephen Warren 2013-07-30 16:40 ` Stephen Warren 2013-07-29 9:19 ` Arend van Spriel 2013-07-29 9:19 ` Arend van Spriel 2013-07-29 10:16 ` Arend van Spriel 2013-07-29 10:16 ` Arend van Spriel 2013-07-27 18:31 ` Richard Cochran 2013-07-27 18:31 ` Richard Cochran 2013-07-27 18:51 ` Tomasz Figa 2013-07-27 18:51 ` Tomasz Figa 2013-07-27 19:22 ` jonsmirl 2013-07-27 19:22 ` jonsmirl at gmail.com 2013-07-28 8:56 ` Richard Cochran 2013-07-28 8:56 ` Richard Cochran 2013-07-28 9:12 ` Tomasz Figa 2013-07-28 9:12 ` Tomasz Figa 2013-07-28 13:19 ` Richard Cochran 2013-07-28 13:19 ` Richard Cochran 2013-07-28 13:39 ` Tomasz Figa 2013-07-28 13:39 ` Tomasz Figa 2013-07-28 14:09 ` jonsmirl 2013-07-28 14:09 ` jonsmirl at gmail.com 2013-07-28 15:35 ` Richard Cochran 2013-07-28 15:35 ` Richard Cochran 2013-07-28 15:50 ` jonsmirl 2013-07-28 15:50 ` jonsmirl at gmail.com 2013-07-28 17:41 ` Mark Brown 2013-07-28 17:41 ` Mark Brown 2013-07-28 21:46 ` David Gibson 2013-07-28 21:46 ` David Gibson 2013-07-28 15:30 ` Richard Cochran 2013-07-28 15:30 ` Richard Cochran 2013-07-29 7:31 ` Maxime Ripard 2013-07-29 7:31 ` Maxime Ripard 2013-07-29 18:38 ` Richard Cochran 2013-07-29 18:38 ` Richard Cochran 2013-07-29 18:51 ` Richard Cochran 2013-07-29 18:51 ` Richard Cochran 2013-07-29 18:05 ` Jason Gunthorpe 2013-07-29 18:05 ` Jason Gunthorpe 2013-07-29 18:27 ` Russell King - ARM Linux 2013-07-29 18:27 ` Russell King - ARM Linux 2013-07-29 22:20 ` David Gibson 2013-07-29 22:20 ` David Gibson 2013-07-29 23:14 ` Jason Gunthorpe 2013-07-29 23:14 ` Jason Gunthorpe 2013-07-29 23:49 ` David Gibson 2013-07-29 23:49 ` David Gibson 2013-07-31 10:37 ` Maxime Bizon 2013-07-31 10:37 ` Maxime Bizon 2013-07-31 10:59 ` Tomasz Figa 2013-07-31 10:59 ` Tomasz Figa 2013-07-31 15:07 ` Richard Cochran 2013-07-31 15:07 ` Richard Cochran 2013-07-31 15:23 ` Tomasz Figa 2013-07-31 15:23 ` Tomasz Figa 2013-07-31 19:12 ` Richard Cochran 2013-07-31 19:12 ` Richard Cochran 2013-07-31 19:29 ` Tomasz Figa 2013-07-31 19:29 ` Tomasz Figa 2013-07-31 20:00 ` Richard Cochran 2013-07-31 20:00 ` Richard Cochran 2013-07-31 20:14 ` Russell King - ARM Linux 2013-07-31 20:14 ` Russell King - ARM Linux 2013-07-31 20:37 ` jonsmirl 2013-07-31 20:37 ` jonsmirl at gmail.com 2013-07-31 20:48 ` Russell King - ARM Linux 2013-07-31 20:48 ` Russell King - ARM Linux 2013-07-31 21:26 ` jonsmirl 2013-07-31 21:26 ` jonsmirl at gmail.com 2013-08-01 9:57 ` Arend van Spriel 2013-08-01 9:57 ` Arend van Spriel 2013-08-01 10:09 ` Mark Brown 2013-08-01 10:09 ` Mark Brown 2013-08-01 10:18 ` David Woodhouse 2013-08-01 10:18 ` David Woodhouse 2013-08-01 13:34 ` jonsmirl 2013-08-01 13:34 ` jonsmirl at gmail.com 2013-08-01 13:43 ` jonsmirl 2013-08-01 13:43 ` jonsmirl at gmail.com 2013-08-01 13:48 ` Rob Herring 2013-08-01 13:48 ` Rob Herring 2013-08-02 3:50 ` David Gibson 2013-08-02 3:50 ` David Gibson 2013-08-13 23:32 ` H. Peter Anvin 2013-08-13 23:32 ` H. Peter Anvin 2013-08-14 1:49 ` Guenter Roeck 2013-08-14 1:49 ` Guenter Roeck 2013-08-14 14:46 ` H. Peter Anvin 2013-08-14 14:46 ` H. Peter Anvin 2013-08-02 8:49 ` Tony Lindgren 2013-08-02 8:49 ` Tony Lindgren 2013-07-29 15:45 ` Matt Porter 2013-07-29 15:45 ` Matt Porter 2013-07-31 12:58 ` Ian Campbell 2013-07-31 12:58 ` Ian Campbell 2013-07-25 17:59 ` Stephen Warren 2013-07-25 17:59 ` Stephen Warren 2013-07-25 19:11 ` Rob Herring 2013-07-25 19:11 ` Rob Herring 2013-07-25 19:31 ` Jason Cooper 2013-07-25 19:31 ` Jason Cooper 2013-07-25 20:04 ` [Ksummit-2013-discuss] " Mark Brown 2013-07-25 20:04 ` Mark Brown 2013-07-25 20:08 ` Jason Cooper 2013-07-25 20:08 ` Jason Cooper 2013-07-25 20:16 ` Rob Herring 2013-07-25 20:16 ` Rob Herring 2013-07-25 20:32 ` Jason Cooper 2013-07-25 20:32 ` Jason Cooper 2013-07-25 21:53 ` [Ksummit-2013-discuss] " Ben Hutchings 2013-07-25 21:53 ` Ben Hutchings 2013-07-26 0:36 ` Stephen Warren 2013-07-26 0:36 ` Stephen Warren 2013-07-26 12:14 ` Jason Cooper 2013-07-26 12:14 ` Jason Cooper 2013-07-26 0:34 ` Stephen Warren 2013-07-26 0:34 ` Stephen Warren 2013-07-26 22:11 ` Rob Herring 2013-07-26 22:11 ` Rob Herring 2013-07-25 23:18 ` Russell King - ARM Linux 2013-07-25 23:18 ` Russell King - ARM Linux 2013-07-26 0:27 ` jonsmirl 2013-07-26 0:27 ` jonsmirl at gmail.com 2013-07-26 11:38 ` Jason Cooper 2013-07-26 11:38 ` Jason Cooper 2013-07-26 14:08 ` [Ksummit-2013-discuss] " David Woodhouse 2013-07-26 14:08 ` David Woodhouse 2013-07-26 13:57 ` Mark Brown 2013-07-26 13:57 ` Mark Brown 2013-07-26 10:55 ` Mark Brown 2013-07-26 10:55 ` Mark Brown 2013-07-28 4:39 ` Grant Likely 2013-07-28 4:39 ` Grant Likely
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