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diff --git a/kernel/Documentation/devicetree/bindings/serial/altera_uart.txt b/kernel/Documentation/devicetree/bindings/serial/altera_uart.txt
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+Altera UART
+
+Required properties:
+- compatible : should be "ALTR,uart-1.0" <DEPRECATED>
+- compatible : should be "altr,uart-1.0"
+
+Optional properties:
+- clock-frequency : frequency of the clock input to the UART