[PATCH 3/6] libnvdimm: Add device-tree based driver

[kbuild test robot]

Hi Oliver,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linux-nvdimm/libnvdimm-for-next]
[also build test WARNING on v4.16-rc6 next-20180323]
[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/Oliver-O-Halloran/libnvdimm-Add-of_node-to-region-and-bus-descriptors/20180325-082036
base:   https://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm.git libnvdimm-for-next
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/nvdimm/of_nvdimm.c:18:30: sparse: symbol 'bus_desc' was not declared. Should it be static?
   drivers/nvdimm/of_nvdimm.c:19:19: sparse: symbol 'bus' was not declared. Should it be static?

Please review and possibly fold the followup patch.

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