Altera SOCFPGA System Manager

modulename: altera-sysmgr.ko

configname: CONFIG_MFD_ALTERA_SYSMGR

Linux Kernel Configuration
└─>Device Drivers
└─>Multifunction device drivers
└─>Device Tree and Open Firmware support
└─>Altera SOCFPGA System Manager
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
Select this to get System Manager support for all Altera branded
SOCFPGAs. The SOCFPGA System Manager handles all SOCFPGAs by
using regmap_mmio accesses for ARM32 parts and SMC calls to
EL3 for ARM64 parts.

source code: