linux-kernel - panel-sitronix-st7789v.c:undefined reference to `of_find_backlight_by

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Date:   Mon, 5 Jun 2017 04:09:25 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Thierry Reding <treding@...dia.com>
Subject: panel-sitronix-st7789v.c:undefined reference to
 `of_find_backlight_by_node'

Hi Maxime,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3c06e6cbdb6a3faa73fbdfd9022e23f82d24c372
commit: 7142afb3a186ed2cd028318205a4852f04283380 drm/panel: Add driver for sitronix ST7789V LCD controller
date:   8 weeks ago
config: x86_64-randconfig-u0-06050046 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 7142afb3a186ed2cd028318205a4852f04283380
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `st7789v_probe':
>> panel-sitronix-st7789v.c:(.text+0x173ea1): undefined reference to `of_find_backlight_by_node'

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