CONFIG_ATMEL_TCB_CLKSRC_BLOCK (not configurable)

configname: CONFIG_ATMEL_TCB_CLKSRC_BLOCK

Linux Kernel Configuration
└─>Device Drivers
└─>Misc devices
└─>ATMEL_TCB_CLKSRC_BLOCK
In linux kernel since version 2.6.26 (release Date: 2008-07-13)  
Some chips provide more than one TC block, so you have the
choice of which one to use for the clock framework. The other
TC can be used for other purposes, such as PWM generation and
interval timing.