default or selected kernelversion does not have config value CONFIG_ARM_S3C24XX_CPUFREQ_IODEBUG.
Result is shown for kernelversion 6.9.2

Debug CPUfreq Samsung driver IO timing


Linux Kernel Configuration
└─>Power management and ACPI options
└─>CPU Frequency scaling
└─>Debug CPUfreq Samsung driver IO timing
In linux kernel since version 3.11 (release Date: 2013-09-02)  
Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core