DT: watchdog: add Alphascale asm9260 watchdog binding documentation.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
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/alphascale-asm9260.txt b/Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt
new file mode 100644 (file)
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+++ b/Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt
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+Alphascale asm9260 Watchdog timer
+
+Required properties:
+
+- compatible : should be "alphascale,asm9260-wdt".
+- reg : Specifies base physical address and size of the registers.
+- clocks : the clocks feeding the watchdog timer. See clock-bindings.txt
+- clock-names : should be set to
+       "mod" - source for tick counter.
+       "ahb" - ahb gate.
+- resets : phandle pointing to the system reset controller with
+       line index for the watchdog.
+- reset-names : should be set to "wdt_rst".
+
+Optional properties:
+- timeout-sec : shall contain the default watchdog timeout in seconds,
+       if unset, the default timeout is 30 seconds.
+- alphascale,mode : three modes are supported
+       "hw" - hw reset (default).
+       "sw" - sw reset.
+       "debug" - no action is taken.
+
+Example:
+
+watchdog0: watchdog@80048000 {
+       compatible = "alphascale,asm9260-wdt";
+       reg = <0x80048000 0x10>;
+       clocks = <&acc CLKID_SYS_WDT>, <&acc CLKID_AHB_WDT>;
+       clock-names = "mod", "ahb";
+       interrupts = <55>;
+       resets = <&rst WDT_RESET>;
+       reset-names = "wdt_rst";
+       timeout-sec = <30>;
+       alphascale,mode = "hw";
+};