dt-bindings: usb: usb251xb: add documentation for data lane swapping
Add optional binding to allow USB differential-pair (D+/D-) data lane swapping. The swapping can be specified for each port separately, default is no swapping. Signed-off-by: Marco Felsch <m.felsch@pengutronix.de> Reviewed-by: Richard Leitner <richard.leitner@skidata.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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