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关于AM335X的PWM驱动



我将内核中PWM驱动改为模块加载的方式,加载之前在开发板中输入以下命令  ls sys/class/pwm发现有:
ecap.2      ehrpwm.1:0  ehrpwm.1:1
看样子是在驱动加载之前就已经有了,请问ecap.2      ehrpwm.1:0  ehrpwm.1:1这几个设备名是什么时候注册进内核的,在什么文件中可以找到?