| # Zephyr EC USBC Configuration |
| |
| [TOC] |
| |
| ## Overview |
| |
| [USB-C] is a flexible connector supporting multiple data rates, protocols, and |
| power in either direction. |
| |
| From the system, USB PD requires a complex state machine as USB PD can |
| operate in many different modes. This includes but isn't limited to: |
| |
| * Negotiated power contracts. Either side of the cable can source or sink |
| power up to 240W (if supported by device). |
| * Reversed cable mode. This requires a mux to switch the signals before |
| getting to the SoC (or AP). |
| * Debug accessory mode, e.g. [Case Closed Debugging (CCD)] |
| * Multiple uses for the 4 differential pair signals including |
| * USB SuperSpeed mode (up to 4 lanes for USB data) |
| * DisplayPort Alternate Mode (up to 4 lanes for DisplayPort data) |
| * Dock Mode (2 lanes for USB data, and 2 lanes for DisplayPort) |
| * USB4/Thunderbolt mode. (4 lanes for USB data) |
| |
| For a more complete list of USB-C Power Delivery features, see the |
| [USB-C PD spec][USB PD Spec Id]. |
| |
| The image below shows a block diagram of a typical [USB-C] setup. |
| |
| ![USBC Block Diagram] |
| # Legend |
| ## See the [EC Acronyms and Technologies] |
| * [AP] |
| * [EC] |
| * [PPC] |
| * [TCPC] |
| * [USB-C Mux] |
| * [Retimer] |
| |
| ## Kconfig Options |
| |
| The `CONFIG_PLATFORM_EC_USBC` option enables USB-C support on the Chromebook. |
| See [Kconfig.usbc] for sub-options related to this feature. |
| |
| The following sub-components must be configured for correct operation of USB-C: |
| * [Zephyr EC Type-C Port Controller] |
| * [Zephyr EC PPC Configuration] |
| * [Zephyr EC SS Mux and Retimer Configuration] |
| * [Zephyr EC Charger Configuration] |
| * [Zephyr EC Power Delivery Configuration] |
| |
| [USB-C]:../usb-c.md |
| [EC Acronyms and Technologies]:../ec_terms.md |
| [AP]:../ec_terms.md#ap |
| [EC]:../ec_terms.md#ec |
| [PPC]:../ec_terms.md#ppc |
| [TCPC]:../ec_terms.md#tcpc |
| [USB-C Mux]:../ec_terms.md#ssmux |
| [Retimer]:../ec_terms.md#retimer |
| [USBC Block Diagram]:../images/usbc_block_diagram.png |
| [USB PD Spec Id]: https://www.usb.org/document-library/usb-power-delivery |
| [Kconfig.usbc]: |
| https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/ec/zephyr/Kconfig.usbc |
| [Zephyr EC Power Delivery Configuration]:zephyr_pd.md |
| [Zephyr EC PPC Configuration]:zephyr_ppc.md |
| [Zephyr EC SS Mux and Retimer Configuration]:zephyr_usbc_ss_mux_and_retimer.md |
| [Zephyr EC Charger Configuration]:zephyr_charger.md |
| [Zephyr EC Type-C Port Controller]:zephyr_tcpc.md |
