dt-bindings: watchdog: add description for UniPhier WDT controller

Add uniphier-wdt dt-bindings documentation.

Signed-off-by: Keiji Hayashibara <hayashibara.keiji@socionext.com>
Acked-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@iguana.be>

diff --git a/Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt b/Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt
new file mode 100644 (file)
index 0000000..bf63375
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt
@@ -0,0 +1,20 @@
+UniPhier watchdog timer controller
+
+This UniPhier watchdog timer controller must be under sysctrl node.
+
+Required properties:
+- compatible: should be "socionext,uniphier-wdt"
+
+Example:
+
+       sysctrl@61840000 {
+               compatible = "socionext,uniphier-ld11-sysctrl",
+                            "simple-mfd", "syscon";
+               reg = <0x61840000 0x4000>;
+
+               watchdog {
+                       compatible = "socionext,uniphier-wdt";
+               }
+
+               other nodes ...
+       };