[Ksummit-discuss] Devicetree Workshop at Kernel Summit Prague (26 Oct 2017)

Ian Lepore ian at freebsd.org
Tue Oct 17 16:21:16 UTC 2017


On Tue, 2017-10-17 at 14:48 +0100, Grant Likely wrote:
> On Tue, Oct 17, 2017 at 10:48 AM, Boris Brezillon
> <boris.brezillon at free-electrons.com> wrote:
> > 
> > Hello Grant,
> > 
> > On Mon, 9 Oct 2017 21:39:51 +0100
> > Grant Likely <grant.likely at secretlab.ca> wrote:
> > 
> > > 
> > > Kernel Summit is now just over 2 weeks away and it is time to pull
> > > together the schedule for the Devicetree workshop. Originally I
> > > planned on just an afternoon, but I've got the room for the whole day,
> > > so I've got a lot of flexibility on the schedule. Unscheduled time can
> > > be used for hacking.
> > > 
> > > Date: 26 Oct 2017
> > > Time: 9:00am-5:30pm (Lunch from 12:30-2:30)
> > > Location: Athens room - Hilton Prague
> > > 
> > > If you plan to attend, make sure you update your OSSunmitE/ELCE
> > > registration to include the DT Workshop (log in to access and modify
> > > your registration):
> > > 
> > > https://www.regonline.com/register/login.aspx?eventID=1883377&MethodId=0&EventsessionId=&Email_Address=&membershipID=
> > > 
> > > Here is my current list of topics in no particular order, including
> > > the topic moderator:
> > > 
> > > Runtime memory consumption (Rob Herring)
> > > Overlay maintenance plan (TBC)
> > > Stable ABI for devicetree (TBC)
> > > DT YAML encoding (Pantelis Antoniou)
> > > DT Schema format - option 1 (Pantelis Antoniou)
> > > DT Schema format - option 2 (Grant Likely)
> > > Sharing Generic bindings (TBC)
> > > devicetree.org update (Grant)
> > > 
> > > Reply to this email if you want to propose another topic.
> > Not sure yet if I'll attend the DT workshop or not, but I thought I
> > could ask my question here because it might be of interest to someone
> > else who is attending.
> > 
> > What happens when the DT bindings is not documented in Linux but in an
> > another project because this project was the first to use it.
> > 
> > I had the case here http://patchwork.ozlabs.org/patch/810275/, and I'm
> > not sure what's the policy when this happens. Should we add a file
> > under Documentation/devicetree/bindings/... that points to the external
> > doc file, should we duplicate the DT bindings doc in Linux, or should
> > we just leave the bindings undocumented in the kernel tree?
> I'm going to add this as a topic. I've got my own opinion, but it
> would be better to discuss in the room because it affects maintainers.
> 
> g.


I've run into the same thing in FreeBSD.  We use bindings and dts
files, exacted periodically from the linux tree and imported into ours,
for all modern arm boards/systems.  Several times I've created drivers
for small things like i2c RTC chips that aren't supported currently by
linux, and it's not clear to me that it's even possible to submit
bindings and dts for them back upstream without also submitting a linux
driver that uses them (which of course I'm not in a position to do).

-- Ian



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