watchdog: at91sam9_wdt: update device tree doc

Add new at91sam9 watchdog properties to the documentation.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 28 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt b/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
index fcdd48f7dcff..f90e294d7631 100644
--- a/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
@@ -9,11 +9,37 @@ Required properties:
 
 Optional properties:
 - timeout-sec: contains the watchdog timeout in seconds.
+- interrupts : Should contain WDT interrupt.
+- atmel,max-heartbeat-sec : Should contain the maximum heartbeat value in
+        seconds. This value should be less or equal to 16. It is used to
+        compute the WDV field.
+- atmel,min-heartbeat-sec : Should contain the minimum heartbeat value in
+        seconds. This value must be smaller than the max-heartbeat-sec value.
+        It is used to compute the WDD field.
+- atmel,watchdog-type : Should be "hardware" or "software". Hardware watchdog
+        use the at91 watchdog reset. Software watchdog use the watchdog
+        interrupt to trigger a software reset.
+- atmel,reset-type : Should be "proc" or "all".
+        "all" : assert peripherals and processor reset signals
+        "proc" : assert the processor reset signal
+        This is valid only when using "hardware" watchdog.
+- atmel,disable : Should be present if you want to disable the watchdog.
+- atmel,idle-halt : Should be present if you want to stop the watchdog when
+        entering idle state.
+- atmel,dbg-halt : Should be present if you want to stop the watchdog when
+        entering debug state.
 
 Example:
-
         watchdog@fffffd40 {
                 compatible = "atmel,at91sam9260-wdt";
                 reg = <0xfffffd40 0x10>;
-                timeout-sec = <10>;
+                interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
+                timeout-sec = <15>;
+                atmel,watchdog-type = "hardware";
+                atmel,reset-type = "all";
+                atmel,dbg-halt;
+                atmel,idle-halt;
+                atmel,max-heartbeat-sec = <16>;
+                atmel,min-heartbeat-sec = <0>;
+                status = "okay";
         };