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ARM: dts: at91rm9200: pullup rx on uart0
For consistency with all other serial pins, add this pullup. It also prevents the signal from floating and so consuming a useless extra amount of power in crowbarred state if nothing is connected to RX. Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
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