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atmel,idle-halt 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 of the CPU stop working while it is in idle state, which is probably not what you want. Signed-off-by: Sylvain Rochet <sylvain.rochet@finsecur.com> Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
51 lines
1.9 KiB
Plaintext
51 lines
1.9 KiB
Plaintext
* Atmel Watchdog Timers
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** at91sam9-wdt
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Required properties:
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- compatible: must be "atmel,at91sam9260-wdt".
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- reg: physical base address of the controller and length of memory mapped
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region.
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Optional properties:
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- timeout-sec: contains the watchdog timeout in seconds.
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- interrupts : Should contain WDT interrupt.
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- atmel,max-heartbeat-sec : Should contain the maximum heartbeat value in
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seconds. This value should be less or equal to 16. It is used to
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compute the WDV field.
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- atmel,min-heartbeat-sec : Should contain the minimum heartbeat value in
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seconds. This value must be smaller than the max-heartbeat-sec value.
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It is used to compute the WDD field.
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- atmel,watchdog-type : Should be "hardware" or "software". Hardware watchdog
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use the at91 watchdog reset. Software watchdog use the watchdog
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interrupt to trigger a software reset.
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- atmel,reset-type : Should be "proc" or "all".
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"all" : assert peripherals and processor reset signals
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"proc" : assert the processor reset signal
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This is valid only when using "hardware" watchdog.
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- atmel,disable : Should be present if you want to disable the watchdog.
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- atmel,idle-halt : Should be present if you want to stop the watchdog when
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entering idle state.
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CAUTION: This property should be used with care, it actually makes the
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watchdog not counting when the CPU is in idle state, therefore the
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watchdog reset time depends on mean CPU usage and will not reset at all
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if the CPU stop working while it is in idle state, which is probably
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not what you want.
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- atmel,dbg-halt : Should be present if you want to stop the watchdog when
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entering debug state.
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Example:
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watchdog@fffffd40 {
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compatible = "atmel,at91sam9260-wdt";
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reg = <0xfffffd40 0x10>;
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interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
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timeout-sec = <15>;
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atmel,watchdog-type = "hardware";
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atmel,reset-type = "all";
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atmel,dbg-halt;
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atmel,idle-halt;
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atmel,max-heartbeat-sec = <16>;
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atmel,min-heartbeat-sec = <0>;
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status = "okay";
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};
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