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Date:   Wed, 14 Mar 2018 00:01:57 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     David Airlie <airlied@...ux.ie>,
        Philippe CORNU <philippe.cornu@...com>,
        Linus Walleij <linus.walleij@...aro.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/panel: rm68200: add backlight dependency

On Tue, Mar 13, 2018 at 09:59:54PM +0100, Arnd Bergmann wrote:
> Like many other panel drivers, this one fails to build
> when backlight support is disabled:
> 
> drivers/gpu/drm/panel/panel-raydium-rm68200.o: In function `rm68200_probe':
> panel-raydium-rm68200.c:(.text+0x14a): undefined reference to `devm_of_find_backlight'
> 
> This adds the appropriate dependency.
> 
> Fixes: 2b7ed18bed1a ("drm/panel: Add support for Raydium RM68200 panel driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/gpu/drm/panel/Kconfig | 1 +
>  1 file changed, 1 insertion(+)

This shouldn't be necessary. include/linux/backlight.h defines a stub if
the backlight class is not enabled.

What tree are you seeing this on?

Thierry

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