Cirrus Logic Lochnagar Audio Development Board

modulename: lochnagar-i2c.ko

configname: CONFIG_MFD_LOCHNAGAR

Linux Kernel Configuration
└─>Device Drivers
└─>Multifunction device drivers
└─>Device Tree and Open Firmware support
└─>Cirrus Logic Lochnagar Audio Development Board
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Support for Cirrus Logic Lochnagar audio development board.

source code: