Hi Bartosz,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.19-rc3 next-20180912]
[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/Bartosz-Golaszewski/nvmem-rework-of-the-subsystem-for-non-DT-users/20180913-071053
config: powerpc-allnoconfig (attached as .config)
compiler: powerpc-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
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
        GCC_VERSION=7.2.0 make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

   In file included from include/linux/rtc.h:18:0,
                    from arch/powerpc/kernel/time.c:52:
   include/linux/nvmem-provider.h: In function 'devm_nvmem_unregister':
>> include/linux/nvmem-provider.h:101:9: error: return makes integer from pointer without a cast [-Werror=int-conversion]
     return ERR_PTR(-ENOSYS);
            ^~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +101 include/linux/nvmem-provider.h

    97	
    98	static inline int
    99	devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem)
   100	{
 > 101		return ERR_PTR(-ENOSYS);
   102	

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