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watchdog: at91sam9_wdt: update device tree doc

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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>
This commit is contained in:
Boris BREZILLON 2013-10-04 09:24:13 +02:00 committed by Wim Van Sebroeck
parent 5161b31dc3
commit 6914c5873c
1 changed files with 28 additions and 2 deletions
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30
Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
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@ -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";
};