CONFIG_PLL_BYPASS is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_PLL_BYPASS.
Result is shown for kernelversion 6.7-rc3

Bypass PLL

configname: CONFIG_PLL_BYPASS

Linux Kernel Configuration
└─>Blackfin Processor Options
└─>Board customizations
└─>Bypass PLL
In linux kernel since version 2.6.24 (release Date: 2008-01-24)