Documentation: DT: Add entries for bcm63xx UART

This squashes a checkpatch warning on my new bcm3384 dts submission.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/serial/bcm63xx-uart.txt b/Documentation/devicetree/bindings/serial/bcm63xx-uart.txt
new file mode 100644 (file)
index 0000000..5c52e5e
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/bcm63xx-uart.txt
@@ -0,0 +1,30 @@
+* BCM63xx UART
+
+Required properties:
+
+- compatible: "brcm,bcm6345-uart"
+
+- reg: The base address of the UART register bank.
+
+- interrupts: A single interrupt specifier.
+
+- clocks: Clock driving the hardware; used to figure out the baud rate
+  divisor.
+
+Example:
+
+       uart0: serial@14e00520 {
+               compatible = "brcm,bcm6345-uart";
+               reg = <0x14e00520 0x18>;
+               interrupt-parent = <&periph_intc>;
+               interrupts = <2>;
+               clocks = <&periph_clk>;
+       };
+
+       clocks {
+               periph_clk: periph_clk@0 {
+                       compatible = "fixed-clock";
+                       #clock-cells = <0>;
+                       clock-frequency = <54000000>;
+               };
+       };