default or selected kernelversion does not have config value CONFIG_LEDS_ATMEL_PWM.
Result is shown for kernelversion 6.5.1

LED Support using Atmel PWM outputs

modulename: leds-atmel-pwm.ko


Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
└─>LED Support using Atmel PWM outputs
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
This option enables support for LEDs driven using outputs
of the dedicated PWM controller found on newer Atmel SOCs.

source code: