[U-Boot] [PATCH v3 01/16] dm: allow limiting pre-reloc markings to spl or tpl

[Simon Glass]

Hi Heiko,

On 16 February 2017 at 17:36, Heiko Stübner <heiko at sntech.de> wrote:
>
> Hi Simon,
>
> Am Montag, 6. Februar 2017, 07:34:54 CET schrieb Simon Glass:
> > On 3 February 2017 at 08:09, Heiko Stuebner <heiko at sntech.de> wrote:
> > > Right now the u-boot,dm-pre-reloc flag will make each marked node
> > > always appear in both spl and tpl. But systems needing an additional
> > > tpl might have special constraints for each, like the spl needing to
> > > be very tiny.
> > >
> > > So introduce two additional flags to mark nodes for only spl or tpl
> > > environments and introduce a function dm_fdt_pre_reloc to automate
> > > the necessary checks in code instances checking for pre-relocation
> > > flags.
> > >
> > > The behaviour of the original flag stays untouched and still marks
> > > a node for both spl and tpl.
> > >
> > > Signed-off-by: Heiko Stuebner <heiko at sntech.de>
> > > ---
> > >
> > >  doc/driver-model/README.txt      |  4 ++++
> > >  drivers/clk/at91/pmc.c           |  3 ++-
> > >  drivers/core/root.c              |  2 +-
> > >  drivers/core/util.c              | 29 +++++++++++++++++++++++++++++
> > >  drivers/pinctrl/pinctrl-uclass.c |  3 ++-
> > >  include/dm/util.h                |  2 ++
> > >  scripts/Makefile.spl             |  7 ++++++-
> > >  tools/dtoc/dtoc.py               |  2 ++
> > >  8 files changed, 48 insertions(+), 4 deletions(-)
> >
> > Reviewed-by: Simon Glass <sjg at chromium.org>
> >
> > s/u-boot/U-Boot
> >
> > Please add a comment for dm_fdt_pre_reloc() in the header file.
> >
> > Two things to consider:
> >
> > - Should we drop the use of u-boot,dm-pre-reloc in Makefile.spl, and
> > convert all users to your version? This would mean having both
> > u-boot,dm-pre-reloc and u-boot,dm-spl in some cases, I suspect.
>         ^^ u-boot,dm-spl and u-boot,dm-tpl I guess
>
> Dropping u-boot,dm-pre-reloc is for you to decide, as you wrote the original
> implementation ;-) . It will save one fdt-query but might need several
> iterations as I guess new boards will add new ones after we remove the old
> ones.

Let's do it. It is more efficient and I don't expect it to cause many
problems if we get it in at the start of the merge window.

>
> > - Can you use #ifdef in SPL/TPL to reduce code size fractionally in
> > dm_fdt_pre_reloc()?
>
> Do you mean moving the
> +       dm_spl = fdt_getprop(blob, offset, "u-boot,dm-spl", NULL);
> +       dm_tpl = fdt_getprop(blob, offset, "u-boot,dm-tpl", NULL);
>
> into the existing #ifdef CONFIG_TPL_BUILD / SPL_BUILD blocks or something
> else?

Well I don't think it matters, but the idea is that there would then
be no point in checking u-boot,dm-tpl except when CONFIG_TPL_BUILD is
defined.

Regards,
Simon