[PATCH v3 1/2] drm/tinydrm: Move tinydrm_of_find_backlight into drm_of.c

[kbuild test robot]

Hi Meghana,

[auto build test ERROR on drm/drm-next]
[also build test ERROR on v4.14-rc2 next-20170929]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Meghana-Madhyastha/drm-tinydrm-drm_of_find_backlight-helper/20170930-063127
base:   git://people.freedesktop.org/~airlied/linux.git drm-next
config: arm-sunxi_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   drivers/gpu/drm/drm_of.o: In function `drm_of_find_backlight':
>> drm_of.c:(.text+0x3bc): undefined reference to `of_find_backlight_by_node'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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