[RFC Patch 0/4] mfd: AXP20x: Add power supply sub-driver

This series adds a power-supply driver to cover backup/RTC battery
charger, VBUS/OTG power in, AC power in and battery charger features
supported by AXP20x PMIC.

The DT bindings documentation patch depends on the following patch
from Carlo Caione:
  http://lists.infradead.org/pipermail/linux-arm-kernel/2014-June/267604.html

Note, the reporting of some of the power supply interrupts might need
to be changed to dev_debug instead of dev_info.

For the DT bindings names they might need prefixing in which case
the corresponding prefix declaration patch from Carlo would be needed
as well:
  http://lists.infradead.org/pipermail/linux-arm-kernel/2014-June/267606.html


Changes since initial posting on linux-sunxi:
 - A few typo fixes in strings/comments
 - Patch splitting

Bruno