[PATCH 3/3] mailbox: mediatek: Add mtk-apu-mailbox driver

[kernel test robot]

Hi Karl.Li,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master v6.12-rc4 next-20241025]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Karl-Li/dt-bindings-mailbox-mediatek-Add-apu-mailbox-document/20241024-173032
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20241024092608.431581-4-karl.li%40mediatek.com
patch subject: [PATCH 3/3] mailbox: mediatek: Add mtk-apu-mailbox driver
config: nios2-randconfig-r111-20241027 (https://download.01.org/0day-ci/archive/20241027/202410271207.42FIkHwC-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 14.1.0
reproduce: (https://download.01.org/0day-ci/archive/20241027/202410271207.42FIkHwC-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410271207.42FIkHwC-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/mailbox/mtk-apu-mailbox.c:29:24: sparse: sparse: symbol 'g_mbox' was not declared. Should it be static?

vim +/g_mbox +29 drivers/mailbox/mtk-apu-mailbox.c

    28	
  > 29	struct mtk_apu_mailbox *g_mbox;
    30	

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