CONFIG_BUS_CLOCK is not available for thedefaultarchitecture x86.
Result is shown for architecture m32r
default or selected kernelversion does not have config value CONFIG_BUS_CLOCK.
Result is shown for kernelversion 6.7-rc3

Bus Clock [Hz] (integer)

configname: CONFIG_BUS_CLOCK

Linux Kernel Configuration
└─>Processor type and features
└─>Bus Clock [Hz] (integer)
In linux kernel since version 2.6.12