Hi Quentin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on ]

url:    https://github.com/0day-ci/linux/commits/Quentin-Schulz/add-support-for-AXP813-ADC-and-battery-power-supply/20180220-051138
base:    
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

quoted

drivers/power/supply/axp20x_battery.c:479:23: sparse: symbol 'axp209_data' was not declared. Should it be
drivers/power/supply/axp20x_battery.c:486:23: sparse: symbol 'axp221_data' was not declared. Should it be

Please review and possibly fold the followup patch.

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