CONFIG_AT91_USE_OLD_CLK is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_AT91_USE_OLD_CLK.
Result is shown for kernelversion 6.5.1

CONFIG_AT91_USE_OLD_CLK (not configurable)

configname: CONFIG_AT91_USE_OLD_CLK

Linux Kernel Configuration
└─>AT91_USE_OLD_CLK
In linux kernel since version 3.14 (release Date: 2014-03-30)