46 lines
1.6 KiB
Plaintext
46 lines
1.6 KiB
Plaintext
* Atmel Watchdog Timers
|
|
|
|
** at91sam9-wdt
|
|
|
|
Required properties:
|
|
- compatible: must be "atmel,at91sam9260-wdt".
|
|
- reg: physical base address of the controller and length of memory mapped
|
|
region.
|
|
|
|
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>;
|
|
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";
|
|
};
|