The LTC3651 reports its status via GPIO lines. This driver translates
the GPIO levels to battery charger status information via sysfs.
It relies on devicetree to supply the IO configuration.
Signed-off-by: NMike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: NSebastian Reichel <sebastian.reichel@collabora.co.uk>