default or selected kernelversion does not have config value CONFIG_SHMOBILE_IPMMU.
Result is shown for kernelversion 6.5.1

CONFIG_SHMOBILE_IPMMU (not configurable)

modulename: shmobile-ipmmu.ko

configname: CONFIG_SHMOBILE_IPMMU

Linux Kernel Configuration
└─>Device Drivers
└─>IOMMU Hardware Support
└─>SHMOBILE_IPMMU
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
drivers/iommu/shmobile-ipmmu.c

is depended by
CONFIG_SHMOBILE_IOMMU