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allwinner: Add support for P2WI bus

Description

allwinner: Add support for P2WI bus

P2WI (Push-Pull Two Wire Interface) is an I2C-like bus used in sun6i SoC
for talking to power management unit IC.

Details

Provenance
manuAuthored on
Parents
rS307821: In the fueword64(9) wrapper for architectures which do not implemented
Branches
Unknown
Tags
Unknown
Reverted By
rS307862: Revert 307822