serial: add device tree binding documentation for ETRAX FS UART
Signed-off-by:Niklas Cassel <nks@flawful.org> Signed-off-by:
Rob Herring <robh@kernel.org>
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Signed-off-by:Niklas Cassel <nks@flawful.org> Signed-off-by:
Rob Herring <robh@kernel.org>