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diff --git a/Documentation/devicetree/bindings/serial/omap_serial.txt b/Documentation/devicetree/bindings/serial/omap_serial.txt
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+OMAP UART controller
+
+Required properties:
+- compatible : should be "ti,j721e-uart", "ti,am654-uart" for J721E controllers
+- compatible : should be "ti,am654-uart" for AM654 controllers
+- compatible : should be "ti,omap2-uart" for OMAP2 controllers
+- compatible : should be "ti,omap3-uart" for OMAP3 controllers
+- compatible : should be "ti,omap4-uart" for OMAP4 controllers
+- compatible : should be "ti,am4372-uart" for AM437x controllers
+- compatible : should be "ti,am3352-uart" for AM335x controllers
+- compatible : should be "ti,dra742-uart" for DRA7x controllers
+- reg : address and length of the register space
+- interrupts or interrupts-extended : Should contain the uart interrupt
+                                      specifier or both the interrupt
+                                      controller phandle and interrupt
+                                      specifier.
+- ti,hwmods : Must be "uart<n>", n being the instance number (1-based)
+
+Optional properties:
+- clock-frequency : frequency of the clock input to the UART
+- dmas : DMA specifier, consisting of a phandle to the DMA controller
+         node and a DMA channel number.
+- dma-names : "rx" for receive channel, "tx" for transmit channel.
+- rs485-rts-delay, rs485-rx-during-tx, linux,rs485-enabled-at-boot-time: see rs485.txt
+- rs485-rts-active-high: drive RTS high when sending (default is low).
+- clocks: phandle to the functional clock as per
+  Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Example:
+
+                uart4: serial@49042000 {
+                        compatible = "ti,omap3-uart";
+                        reg = <0x49042000 0x400>;
+                        interrupts = <80>;
+                        dmas = <&sdma 81 &sdma 82>;
+                        dma-names = "tx", "rx";
+                        ti,hwmods = "uart4";
+                        clock-frequency = <48000000>;
+                };