dt-bindings: watchdog: Add bindings for RAVE SP watchdog driver

Add Device Tree bindings for RAVE SP watchdog drvier - an MFD cell of
parent RAVE SP driver (documented in
Documentation/devicetree/bindings/mfd/zii,rave-sp.txt).

Acked-by: Philippe Ombredanne <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Acked-by: Rob Herring <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Signed-off-by: Nikita Yushchenko <[email protected]>
Signed-off-by: Andrey Smirnov <[email protected]>
Signed-off-by: Lee Jones <[email protected]>

diff --git a/Documentation/devicetree/bindings/watchdog/zii,rave-sp-wdt.txt b/Documentation/devicetree/bindings/watchdog/zii,rave-sp-wdt.txt
new file mode 100644 (file)
index 0000000..3de9618
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/zii,rave-sp-wdt.txt
@@ -0,0 +1,39 @@
+Zodiac Inflight Innovations RAVE Supervisory Processor Watchdog Bindings
+
+RAVE SP watchdog device is a "MFD cell" device corresponding to
+watchdog functionality of RAVE Supervisory Processor. It is expected
+that its Device Tree node is specified as a child of the node
+corresponding to the parent RAVE SP device (as documented in
+Documentation/devicetree/bindings/mfd/zii,rave-sp.txt)
+
+Required properties:
+
+- compatible: Depending on wire protocol implemented by RAVE SP
+  firmware, should be one of:
+       - "zii,rave-sp-watchdog"
+       - "zii,rave-sp-watchdog-legacy"
+
+Optional properties:
+
+- wdt-timeout: Two byte nvmem cell specified as per
+               Documentation/devicetree/bindings/nvmem/nvmem.txt
+
+Example:
+
+       rave-sp {
+               compatible = "zii,rave-sp-rdu1";
+               current-speed = <38400>;
+
+               eeprom {
+                       wdt_timeout: wdt-timeout@8E {
+                               reg = <0x8E 2>;
+                       };
+               };
+
+               watchdog {
+                       compatible = "zii,rave-sp-watchdog";
+                       nvmem-cells = <&wdt_timeout>;
+                       nvmem-cell-names = "wdt-timeout";
+               };
+       }
+