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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:
  For Wolfson Microelectronic Arizona codecs: ../mfd/arizona.txt
  For Cirrus Logic Madera codecs: ../mfd/madera.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