[RFC/PATCH] lib/Kconfig: Enable OF_LIBFDT_OVERLAY by default when FIT is enabled

[Tom Rini]

On Sun, Jan 29, 2023 at 06:30:22PM +0200, Laurent Pinchart wrote:

> FIT image support is commonly used to bundle a kernel image, a device
> tree, and device tree overlays. Applying overlays requires the
> OF_LIBFDT_OVERLAY config option to be set, which lots of boards fail to
> select, most likely because developers never noticed. This leads to an
> error when trying to apply overlays:
> 
> "config with overlays but CONFIG_OF_LIBFDT_OVERLAY not set"
> 
> TI ARM boards select the option by default. Extend this to all systems
> that select the FIT option. This only affects the default, overlay
> support can still be disabled manually in the configuration.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> Reviewed-by: Marek Vasut <marex at denx.de>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> ---
> I'm posting this as an RFC to get feedback. If the idea is generally
> appreciated, I'll update the defconfig files accordingly.

Alright, so, I put this through a world build, and most platforms grow
by 4-5kB. I think that means what I'd really like to see as a starting
point is more SoCs doing an "imply OF_LIBFDT_OVERLAY if OF_LIBFDT && FIT"
or adding to the default y list below, or similar.  If that brings us to
the point where a good number of ARM boards with FIT are enabling it, we
can default y if ARM, for example.  But right now it's more like several
hundred boards growing in size, which is uncomfortable, given the size
it's growing by.

-- 
Tom
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