wm831x: Factor out WM831x backup battery charger
The backup battery on WM831x is a separate IP block to the main PMU and is largely unrelated to the main supply functionality. Factor it out into a separate driver in order to reflect this and better support future hardware versions. Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: NSamuel Ortiz <sameo@linux.intel.com> Signed-off-by: NAnton Vorontsov <cbouatmailru@gmail.com>
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drivers/power/wm831x_backup.c
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