default or selected kernelversion does not have config value CONFIG_ARM_EXYNOS5_BUS_DEVFREQ.
Result is shown for kernelversion 6.5.1

ARM Exynos5250 Bus DEVFREQ Driver

modulename: exynos_ppmu.ko


Linux Kernel Configuration
└─>Device Drivers
└─>Generic Dynamic Voltage and Frequency Scaling (DVFS) support
└─>ARM Exynos5250 Bus DEVFREQ Driver
In linux kernel since version 3.11 (release Date: 2013-09-02)  
This adds the DEVFREQ driver for Exynos5250 bus interface (vdd_int).
It reads PPMU counters of memory controllers and adjusts the
operating frequencies and voltages with OPP support.

source code: