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Documentation / devicetree / bindings / watchdog / atmel-wdt.txt




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Based on kernel version 3.15.4. Page generated on 2014-07-07 09:02 EST.

1	* Atmel Watchdog Timers
2	
3	** at91sam9-wdt
4	
5	Required properties:
6	- compatible: must be "atmel,at91sam9260-wdt".
7	- reg: physical base address of the controller and length of memory mapped
8	  region.
9	
10	Optional properties:
11	- timeout-sec: contains the watchdog timeout in seconds.
12	- interrupts : Should contain WDT interrupt.
13	- atmel,max-heartbeat-sec : Should contain the maximum heartbeat value in
14		seconds. This value should be less or equal to 16. It is used to
15		compute the WDV field.
16	- atmel,min-heartbeat-sec : Should contain the minimum heartbeat value in
17		seconds. This value must be smaller than the max-heartbeat-sec value.
18		It is used to compute the WDD field.
19	- atmel,watchdog-type : Should be "hardware" or "software". Hardware watchdog
20		use the at91 watchdog reset. Software watchdog use the watchdog
21		interrupt to trigger a software reset.
22	- atmel,reset-type : Should be "proc" or "all".
23		"all" : assert peripherals and processor reset signals
24		"proc" : assert the processor reset signal
25		This is valid only when using "hardware" watchdog.
26	- atmel,disable : Should be present if you want to disable the watchdog.
27	- atmel,idle-halt : Should be present if you want to stop the watchdog when
28		entering idle state.
29	- atmel,dbg-halt : Should be present if you want to stop the watchdog when
30		entering debug state.
31	
32	Example:
33		watchdog@fffffd40 {
34			compatible = "atmel,at91sam9260-wdt";
35			reg = <0xfffffd40 0x10>;
36			interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
37			timeout-sec = <15>;
38			atmel,watchdog-type = "hardware";
39			atmel,reset-type = "all";
40			atmel,dbg-halt;
41			atmel,idle-halt;
42			atmel,max-heartbeat-sec = <16>;
43			atmel,min-heartbeat-sec = <0>;
44			status = "okay";
45		};
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