Cirrus Logic Arizona class audio SoCs

These devices are audio SoCs with extensive digital capabilities and a range
of analogue I/O.

This document lists regulator specific bindings, see the primary binding
document:
  ../mfd/arizona.txt

Optional properties:
  - wlf,ldoena : GPIO specifier for the GPIO controlling LDOENA

Optional subnodes:
  - ldo1 : Initial data for the LDO1 regulator, as covered in
    Documentation/devicetree/bindings/regulator/regulator.txt
  - micvdd : Initial data for the MICVDD regulator, as covered in
    Documentation/devicetree/bindings/regulator/regulator.txt
