dt-binding: usb: add "super-speed-plus"

This commit adds "super-speed-plus" to valid argument list of
"maximum-speed" property.

Signed-off-by: JC Kuo <jckuo@nvidia.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
JC Kuo 2020-01-13 14:00:46 +08:00 • committed by Rob Herring
commit 1eb69bfded