DT include files (was: [GIT PULL 2/2] ARM: imx: device tree changes for 3.14)

[Shawn Guo]

On Fri, Jan 03, 2014 at 11:29:35AM -0800, Olof Johansson wrote:
> On Thu, Jan 2, 2014 at 7:04 PM, Shawn Guo <shawn.guo at linaro.org> wrote:
> > On Thu, Jan 02, 2014 at 06:41:30PM -0800, Olof Johansson wrote:
> >> Ok, then it's probably just the location of the header files that
> >> should be adjusted. Other subsystems have placed them under
> >> include/dt-bindings/<subsystem>, so that's likely a better place for
> >> these as well, don't you think?
> >
> > I had a little discussion with DT people when the headers were firstly
> > created.  These pinctrl headers are a little different from the headers
> > in include/dt-bindings/<subsystem>.  The latter are used by both kernel
> > and device tree sources, while the pinctrl headers are used by device
> > tree sources only, so I chose to put them just in the same folder as
> > dts files.  And DT people are fine with my take.
> 
> Since you don't provide references to this I had to go searching for
> it. All I find is some discussion from 8 months ago, and quite a bit
> of that seems to have been about changing bindings, and some about the
> preprocessor behavior. Also, the patches seem to have been too big to
> make it out on the lists.
> 
> I'd like a fresh look from DT people on this just to make sure no
> opinions have changed -- lots of things have changed in the last 8
> months w.r.t. DT.

Indeed, it's been quite a long time.  Let me restate my point.  The
include/dt-bindings is introduced as a folder to hold headers that are
referenced by both kernel and DTS.  That's why we create the folder in
the kernel include folder and have arch/arm/boot/dts/include/dt-bindings
being a symbol link to it.  All the headers in there need to be
duplicated between kernel and DTS tree, when we move DTS files into
a separated repository.  Putting DTS local headers into the folder is
absolutely unnecessary, and will only confuse people and bother
ourselves when moving DTS files out of kernel tree.

Shawn

> 
> I've pinged them on IRC, let's see if they wake up. Adding explicit cc too.
> 
> 
> -Olof