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CONFIG_TYPEC: USB Type-C Support

General informations

The Linux kernel configuration item CONFIG_TYPEC has multiple definitions:

found in drivers/usb/typec/Kconfig

The configuration item CONFIG_TYPEC:

Help text

(none)

USB Type-C Support found in drivers/usb/typec/Kconfig

The configuration item CONFIG_TYPEC:

Help text

USB Type-C Specification defines a cable and connector for USB where only one type of plug is supported on both ends, i.e. there will not be Type-A plug on one end of the cable and Type-B plug on the other. Determination of the host-to-device relationship happens through a specific Configuration Channel (CC) which goes through the USB Type-C cable. The Configuration Channel may also be used to detect optional Accessory Modes - Analog Audio and Debug - and if USB Power Delivery is supported, the Alternate Modes, where the connector is used for something else then USB communication.

USB Power Delivery Specification defines a protocol that can be used to negotiate the voltage and current levels with the connected partners. USB Power Delivery allows higher voltages then the normal 5V, up to 20V, and current up to 5A over the cable. The USB Power Delivery protocol is also used to negotiate the optional Alternate Modes when they are supported. USB Power Delivery does not depend on USB Type-C connector, however it is mostly used together with USB Type-C connectors.

USB Type-C and USB Power Delivery Specifications define a set of state machines that need to be implemented in either software or firmware. Simple USB Type-C PHYs, for example USB Type-C Port Controller Interface Specification compliant "Port Controllers" need the state machines to be handled in the OS, but stand-alone USB Type-C and Power Delivery controllers handle the state machines inside their firmware. The USB Type-C and Power Delivery controllers usually function autonomously, and do not necessarily require drivers.

Enable this configurations option if you have USB Type-C connectors on your system and 1) you know your USB Type-C hardware requires OS control (a driver) to function, or 2) if you need to be able to read the status of the USB Type-C ports in your system, or 3) if you need to be able to swap the power role (decide are you supplying or consuming power over the cable) or data role (host or device) when both roles are supported.

For more information, see the kernel documentation for USB Type-C Connector Class API (Documentation/driver-api/usb/typec.rst) https://www.kernel.org/doc/html/latest/driver-api/usb/typec.html and ABI (Documentation/ABI/testing/sysfs-class-typec).

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