dt-bindings: watchdog: Document armada-37xx-wdt binding

This adds device tree binding documentation for the CPU watchdog found
on Armada 37xx SOCs (EspressoBin, Turris Mox).

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/Documentation/devicetree/bindings/watchdog/armada-37xx-wdt.txt b/Documentation/devicetree/bindings/watchdog/armada-37xx-wdt.txt
new file mode 100644 (file)
index 0000000..a8d00c3
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/armada-37xx-wdt.txt
@@ -0,0 +1,23 @@
+* Armada 37xx CPU Watchdog Timer Controller
+
+Required properties:
+- compatible : must be "marvell,armada-3700-wdt"
+- reg : base physical address of the controller and length of memory mapped
+       region.
+- clocks : the clock feeding the watchdog timer. See clock-bindings.txt
+- marvell,system-controller : reference to syscon node for the CPU Miscellaneous
+       Registers
+
+Example:
+
+       cpu_misc: system-controller@d000 {
+               compatible = "marvell,armada-3700-cpu-misc", "syscon";
+               reg = <0xd000 0x1000>;
+       };
+
+       wdt: watchdog@8300 {
+               compatible = "marvell,armada-3700-wdt";
+               reg = <0x8300 0x40>;
+               marvell,system-controller = <&cpu_misc>;
+               clocks = <&xtalclk>;
+       };