[PATCH V2 3/3] nvmem: add driver handling U-Boot environment variables

[kernel test robot]

Hi "Rafał,

I love your patch! Yet something to improve:

[auto build test ERROR on robh/for-next]
[also build test ERROR on mtd/mtd/next mtd/mtd/fixes linus/master v5.16-rc8]
[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]

url:    https://github.com/0day-ci/linux/commits/Rafa-Mi-ecki/mtd-core-call-devm_of_platform_populate-for-MTD-devices/20211230-170531
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: nios2-randconfig-r013-20220105 (https://download.01.org/0day-ci/archive/20220105/202201051502.yOxThsL0-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/52f6be4712d04b927cd356dd95940bd76f1f5b97
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Rafa-Mi-ecki/mtd-core-call-devm_of_platform_populate-for-MTD-devices/20211230-170531
        git checkout 52f6be4712d04b927cd356dd95940bd76f1f5b97
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nios2 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>):

   nios2-linux-ld: drivers/nvmem/u-boot-env.o: in function `u_boot_env_read':
   u-boot-env.c:(.text+0x2c): undefined reference to `mtd_read'
   u-boot-env.c:(.text+0x2c): relocation truncated to fit: R_NIOS2_CALL26 against `mtd_read'
   nios2-linux-ld: drivers/nvmem/u-boot-env.o: in function `u_boot_env_parse':
   u-boot-env.c:(.text+0x2d4): undefined reference to `mtd_read'
   u-boot-env.c:(.text+0x2d4): relocation truncated to fit: R_NIOS2_CALL26 against `mtd_read'
>> nios2-linux-ld: u-boot-env.c:(.text+0x314): undefined reference to `mtd_read'
   u-boot-env.c:(.text+0x314): relocation truncated to fit: R_NIOS2_CALL26 against `mtd_read'
   nios2-linux-ld: drivers/nvmem/u-boot-env.o: in function `u_boot_env_probe':
   u-boot-env.c:(.text+0x4ec): undefined reference to `get_mtd_device_nm'
   u-boot-env.c:(.text+0x4ec): relocation truncated to fit: R_NIOS2_CALL26 against `get_mtd_device_nm'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org