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Can the usb-c Port of RasPi 4 used for anything else but Power ?

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    in a word - no. Feb 22 '20 at 23:31
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    I believe it can be used for USB OTG - like the Pi Zero etc - although why you would want to do this eludes me.
    – Milliways
    Feb 23 '20 at 3:06
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YES! The USB-C port can be used as a USB On-The-Go (OTG) port, both power and data is populated in the connector, see schematic.

https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_SCH_4b_4p0_reduced.pdf

The OTG hardware present on previous models of Pi is still available and it has moved to a single connection on the USB-C port. The OTG hardware is intended to be used in device-only mode on Pi 4.

https://www.raspberrypi.org/documentation/hardware/raspberrypi/usb/README.md

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