config DM_PWM bool "Enable support for pulse-width modulation devices (PWM)" depends on DM help A pulse-width modulator emits a pulse of varying width and provides control over the duty cycle (high and low time) of the signal. This is often used to control a voltage level. The more time the PWM spends in the 'high' state, the higher the voltage. The PWM's frequency/period can be controlled along with the proportion of that time that the signal is high.