CONFIG_OMAP_SMARTREFLEX_CLASS3 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_OMAP_SMARTREFLEX_CLASS3.
Result is shown for kernelversion 6.2.5

Class 3 mode of Smartreflex Implementation

modulename: smartreflex-class3.ko

configname: CONFIG_OMAP_SMARTREFLEX_CLASS3

Linux Kernel Configuration
└─>TI OMAP Common Features
└─>Class 3 mode of Smartreflex Implementation
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
Say Y to enable Class 3 implementation of Smartreflex

Class 3 implementation of Smartreflex employs continuous hardware
voltage calibration.

source code: