LED MTD (NAND/NOR) Trigger

modulename: ledtrig-mtd.ko

configname: CONFIG_LEDS_TRIGGER_MTD

Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
└─>LED Trigger support
└─>Memory Technology Device (MTD) support
└─>LED MTD (NAND/NOR) Trigger
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This allows LEDs to be controlled by MTD activity.
If unsure, say N.

source code:
drivers/leds/trigger/ledtrig-mtd.c