I'm trying to decipher how the Adafruit_BBIO Python library does PWM, in 
preparation for supporting kernels 4.1+. The library currently loads a cape 
file of the name "bone_pwm_P9_21" or whatever pin number. I've looked in the 
/lib/firmware folder and there is no such .dtbo file.

The elinux wiki page on the topic (http://elinux.org/Capemgr) says that the 
capemgr checks in  arch/arm/boot/dts/am335x-bone-common.dtsi for a 
corresponding .dtbo file, or /lib/firmware. My question is: how can I read that 
.dtsi file to know where it's getting the corresponding .dtbo?

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