| * 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. |
| - clocks: phandle to input clock. |
| |
| 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. |
| CAUTION: This property should be used with care, it actually makes the |
| watchdog not counting when the CPU is in idle state, therefore the |
| watchdog reset time depends on mean CPU usage and will not reset at all |
| if the CPU stop working while it is in idle state, which is probably |
| not what you want. |
| - 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>; |
| clocks = <&clk32k>; |
| 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>; |
| }; |
