Re: [RFC PATCH v2 2/3] of: Add support for -@ when compiling overlays

[Florian Fainelli]

On 4/27/2022 2:24 PM, Rob Herring wrote:
> On Wed, Apr 27, 2022 at 02:52:42PM -0400, Detlev Casanova wrote:
> > This commit adds an option to compile all device trees with -@ to add the
> > symbol table to the Device Tree Blobs.
>
> Why would we want to tie this to the kernel config?
>
> Globally enabling it has already been discussed and rejected.
>
> > It prepares the introduction of device tree overlays that are
> > not applied on device trees at compile time (dtbo files.)
> >
> > These device tree overlays will be used by either a bootloader or a
> > linux userspace tool to extend the base device tree.
> >
> > This is used e.g. for drivers that need device tree nodes for optional
> > non plug and play devices, like an external DSI touchscreen panel that
> > embeds different i2c devices to control it.
>
> You can already set DTC_FLAGS per directory (and target?), so enable it
> for the dtbs that have overlays.

Looks like this patch series from Aurelien should take care of that:

https://lore.kernel.org/linux-arm-kernel/20220427233607.1225419-1-
aurelien@xxxxxxxxxxx/
--
Florian