[PATCH 1/2] dts: add property removal option CONFIG_OF_REMOVE_PROPS

[Tom Rini]

On Sat, Jan 11, 2020 at 04:13:02AM +0900, Masahiro Yamada wrote:
> Hi Tom,
> 
> On Sat, Jan 11, 2020 at 1:39 AM Tom Rini <trini at konsulko.com> wrote:
> 
> > >  quiet_cmd_shipped = SHIPPED $@
> > > -cmd_shipped = cat $< > $@
> > > +cmd_shipped = cat $< | $(objtree)/tools/fdtgrep -r -O dtb - -o $@    \
> > > +             $(addprefix -P ,$(subst $\",,$(CONFIG_OF_REMOVE_PROPS)))
> > >
> > >  $(obj)/%: $(src)/%_shipped
> > >       $(call cmd,shipped)
> >
> > On further thinking, this will make it harder in the case of passing the
> > DTB directly to the kernel.  We should guard this option by something
> > else first.
> 
> Please let me ask a question about this.
> In my understanding, U-Boot DTB is a different instance
> from the DTB passed to the kernel.
> Was it changed, or is the change planned?

For a long time now I believe we've had some platforms that wanted to be
passed, and pass on again, a single DTB.  There's also been boards that
have wanted to (or have been) passing what we have on.  We also have the
case of platforms that more constrained and so stripping information out
of the DTB for U-Boot, and continuing to load the kernel DTB from
somewhere else, is what they need and want.

-- 
Tom
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