CONFIG_CLKSRC_ST_LPC (not configurable)

modulename: clksrc_st_lpc.ko

configname: CONFIG_CLKSRC_ST_LPC

Linux Kernel Configuration
└─>Device Drivers
└─>Clock Source drivers
└─>CLKSRC_ST_LPC
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Enable this option to use the Low Power controller timer
as clocksource.

source code:
drivers/clocksource/clksrc_st_lpc.c