| Wenyou Yang | f4fff94 | 2015-08-06 18:17:05 +0800 | [diff] [blame] | 1 | * Atmel SAMA5D4 Watchdog Timer (WDT) Controller |
| 2 | |
| 3 | Required properties: |
| 4 | - compatible: "atmel,sama5d4-wdt" |
| 5 | - reg: base physical address and length of memory mapped region. |
| 6 | |
| 7 | Optional properties: |
| 8 | - timeout-sec: watchdog timeout value (in seconds). |
| 9 | - interrupts: interrupt number to the CPU. |
| 10 | - atmel,watchdog-type: should be "hardware" or "software". |
| 11 | "hardware": enable watchdog fault reset. A watchdog fault triggers |
| 12 | watchdog reset. |
| 13 | "software": enable watchdog fault interrupt. A watchdog fault asserts |
| 14 | watchdog interrupt. |
| 15 | - atmel,idle-halt: present if you want to stop the watchdog when the CPU is |
| 16 | in idle state. |
| 17 | CAUTION: This property should be used with care, it actually makes the |
| 18 | watchdog not counting when the CPU is in idle state, therefore the |
| 19 | watchdog reset time depends on mean CPU usage and will not reset at all |
| 20 | if the CPU stop working while it is in idle state, which is probably |
| 21 | not what you want. |
| 22 | - atmel,dbg-halt: present if you want to stop the watchdog when the CPU is |
| 23 | in debug state. |
| 24 | |
| 25 | Example: |
| 26 | watchdog@fc068640 { |
| 27 | compatible = "atmel,sama5d4-wdt"; |
| 28 | reg = <0xfc068640 0x10>; |
| 29 | interrupts = <4 IRQ_TYPE_LEVEL_HIGH 5>; |
| 30 | timeout-sec = <10>; |
| 31 | atmel,watchdog-type = "hardware"; |
| 32 | atmel,dbg-halt; |
| 33 | atmel,idle-halt; |
| 34 | status = "okay"; |
| 35 | }; |