[PATCH/RFC 6/8] serial: pxa: Update DT binding documentation

[Kevin Cernekee <cernekee@gmail.com>]

Add a couple of missing required properties; add the new optional
properties and an example.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
---
 .../devicetree/bindings/serial/mrvl-serial.txt     | 34 +++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/serial/mrvl-serial.txt b/Documentation/devicetree/bindings/serial/mrvl-serial.txt
index d744340..5bab455 100644
--- a/Documentation/devicetree/bindings/serial/mrvl-serial.txt
+++ b/Documentation/devicetree/bindings/serial/mrvl-serial.txt
@@ -1,4 +1,36 @@
 PXA UART controller
 
 Required properties:
-- compatible : should be "mrvl,mmp-uart" or "mrvl,pxa-uart".
+- compatible : should be "mrvl,mmp-uart", "mrvl,pxa-uart", or
+  "brcm,bcm7401-uart".
+- interrupts : a single interrupt specifier.
+- clocks : phandle to a clock; used to compute the baud divisor.
+
+Optional properties:
+- fifo-size : defaults to 64 bytes.
+- big-endian : always use BE register accesses.
+- native-endian : use BE register accesses if the kernel was built for BE,
+  otherwise use LE register accesses.
+
+Example:
+
+	clocks {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		uart_clk: uart_clk@0 {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <81000000>;
+		};
+	};
+
+	uart0: serial@10406900 {
+		compatible = "brcm,bcm7401-upg-uart";
+		reg = <0x10406900 0x20>;
+		native-endian;
+		fifo-size = <32>;
+		interrupt-parent = <&periph_intc>;
+		interrupts = <64>;
+		clocks = <&uart_clk>;
+	};
-- 
2.1.1