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authorBoris BREZILLON <b.brezillon@overkiz.com>2013-10-04 09:24:13 +0200
committerWim Van Sebroeck <wim@iguana.be>2014-01-28 21:29:08 +0100
commit6914c5873c227f0eb03e3860a1cf95a930a06f31 (patch)
treeeba8c919e4cef557bc8602482e38999b7016a981 /Documentation
parent5161b31dc39a6d6dadc95f298de48a725b73ada8 (diff)
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/watchdog/atmel-wdt.txt30
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";
};