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

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Date:   Wed, 27 Apr 2022 16:24:39 -0500
From:   Rob Herring <robh@...nel.org>
To:     Detlev Casanova <detlev.casanova@...labora.com>
Cc:     linux-kernel@...r.kernel.org, arnd@...db.de,
        bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        f.fainelli@...il.com, frowand.list@...il.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, masahiroy@...nel.org,
        michal.lkml@...kovi.net, ndesaulniers@...gle.com,
        nsaenz@...nel.org, olof@...om.net, rjui@...adcom.com,
        sbranden@...adcom.com, soc@...nel.org, stefan.wahren@...e.com
Subject: Re: [RFC PATCH v2 2/3] of: Add support for -@ when compiling overlays

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.

> 
> Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
> ---
>  drivers/of/Kconfig   | 8 ++++++++
>  scripts/Makefile.lib | 9 +++++++--
>  2 files changed, 15 insertions(+), 2 deletions(-)