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The WCH CH334/CH335[0] are USB2.0 protocol compliant 4-port USB HUB controller chips, supporting USB2.0 high-speed and full-speed for upstream ports, and USB2.0 high-speed 480Mbps, full-speed 12Mbps and low-speed 1.5Mbps for downstream ports, supporting not only low-cost STT mode (single TT schedules 4 downstream ports in time share), but also supports high performance MTT mode (4 TTs each corresponding to 1 port, concurrent processing). [0]: https://www.wch-ic.com/downloads/CH334DS1_PDF.html Signed-off-by: Chaoyi Chen <chaoyi.chen@rock-chips.com> Link: https://patch.msgid.link/20260113095827.115-3-kernel@airkyi.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>