dt: bindings: add documentation for zx2967 family watchdog controller

This patch adds dt-binding documentation for zx2967 family
watchdog controller.

Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt b/Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt
new file mode 100644 (file)
index 0000000..06ce677
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt
@@ -0,0 +1,32 @@
+ZTE zx2967 Watchdog timer
+
+Required properties:
+
+- compatible : should be one of the following.
+       * zte,zx296718-wdt
+- reg : Specifies base physical address and size of the registers.
+- clocks : Pairs of phandle and specifier referencing the controller's clocks.
+- resets : Reference to the reset controller controlling the watchdog
+           controller.
+
+Optional properties:
+
+- timeout-sec : Contains the watchdog timeout in seconds.
+- zte,wdt-reset-sysctrl : Directs how to reset system by the watchdog.
+       if we don't want to restart system when watchdog been triggered,
+       it's not required, vice versa.
+       It should include following fields.
+         * phandle of aon-sysctrl.
+         * offset of register that be written, should be 0xb0.
+         * configure value that be written to aon-sysctrl.
+         * bit mask, corresponding bits will be affected.
+
+Example:
+
+wdt: watchdog@1465000 {
+       compatible = "zte,zx296718-wdt";
+       reg = <0x1465000 0x1000>;
+       clocks = <&topcrm WDT_WCLK>;
+       resets = <&toprst 35>;
+       zte,wdt-reset-sysctrl = <&aon_sysctrl 0xb0 1 0x115>;
+};