[RESEND PATCH v3 8/9] tty: cadence: Document DT binding

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Add binding documentation for the Cadence UART.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xxxxxxxxxx>
Acked-by: Peter Crosthwaite <peter.crosthwaite@xxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
Tested-by: Michal Simek <michal.simek@xxxxxxxxxx>
---

Changes in v3: None
Changes in v2: None

 .../devicetree/bindings/serial/cdns,uart.txt         | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/serial/cdns,uart.txt

diff --git a/Documentation/devicetree/bindings/serial/cdns,uart.txt b/Documentation/devicetree/bindings/serial/cdns,uart.txt
new file mode 100644
index 000000000000..a3eb154c32ca
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/cdns,uart.txt
@@ -0,0 +1,20 @@
+Binding for Cadence UART Controller
+
+Required properties:
+- compatible : should be "cdns,uart-r1p8", or "xlnx,xuartps"
+- reg: Should contain UART controller registers location and length.
+- interrupts: Should contain UART controller interrupts.
+- clocks: Must contain phandles to the UART clocks
+  See ../clocks/clock-bindings.txt for details.
+- clock-names: Tuple to identify input clocks, must contain "uart_clk" and "pclk"
+  See ../clocks/clock-bindings.txt for details.
+
+
+Example:
+	uart@e0000000 {
+		compatible = "cdns,uart-r1p8";
+		clocks = <&clkc 23>, <&clkc 40>;
+		clock-names = "uart_clk", "pclk";
+		reg = <0xE0000000 0x1000>;
+		interrupts = <0 27 4>;
+	};
-- 
1.9.1.1.gbb9f595

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