devicetree: Add Cadence WDT devicetree bindings documentation

Add cadence-wdt bindings documentation.

Signed-off-by: Harini Katakam <harinik@xilinx.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/Documentation/devicetree/bindings/watchdog/cadence-wdt.txt b/Documentation/devicetree/bindings/watchdog/cadence-wdt.txt
new file mode 100644 (file)
index 0000000..c3a36ee
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/cadence-wdt.txt
@@ -0,0 +1,24 @@
+Zynq Watchdog Device Tree Bindings
+-------------------------------------------
+
+Required properties:
+- compatible           : Should be "cdns,wdt-r1p2".
+- clocks               : This is pclk (APB clock).
+- interrupts           : This is wd_irq - watchdog timeout interrupt.
+- interrupt-parent     : Must be core interrupt controller.
+
+Optional properties
+- reset-on-timeout     : If this property exists, then a reset is done
+                         when watchdog times out.
+- timeout-sec          : Watchdog timeout value (in seconds).
+
+Example:
+       watchdog@f8005000 {
+               compatible = "cdns,wdt-r1p2";
+               clocks = <&clkc 45>;
+               interrupt-parent = <&intc>;
+               interrupts = <0 9 1>;
+               reg = <0xf8005000 0x1000>;
+               reset-on-timeout;
+               timeout-sec = <10>;
+       };