Jetpack/kernel/nvidia/drivers/hwmon/Kconfig

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if HWMON
config GENERIC_PWM_TACHOMETER
tristate "Generic PWM based tachometer driver"
depends on PWM
help
Enables a driver to use PWM signal from motor to use
for measuring the motor speed. The RPM is captured by
PWM modules which has PWM capture capability and this
drivers reads the captured data from PWM IP to convert
it to speed in RPM.
endif