Commit 6914c587 authored by Boris BREZILLON's avatar Boris BREZILLON Committed by Wim Van Sebroeck

watchdog: at91sam9_wdt: update device tree doc

Add new at91sam9 watchdog properties to the documentation.
Signed-off-by: default avatarBoris BREZILLON <b.brezillon@overkiz.com>
Acked-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 5161b31d
...@@ -9,11 +9,37 @@ Required properties: ...@@ -9,11 +9,37 @@ Required properties:
Optional properties: Optional properties:
- timeout-sec: contains the watchdog timeout in seconds. - 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: Example:
watchdog@fffffd40 { watchdog@fffffd40 {
compatible = "atmel,at91sam9260-wdt"; compatible = "atmel,at91sam9260-wdt";
reg = <0xfffffd40 0x10>; 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";
}; };
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