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Commit f4fff94e authored by Wenyou Yang's avatar Wenyou Yang Committed by Wim Van Sebroeck
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Documentation: dt: binding: atmel-sama5d4-wdt: for SAMA5D4 watchdog driver 



The compatible "atmel,sama5d4-wdt" supports the SAMA5D4 watchdog driver
and the watchdog's WDT_MR register can be written more than once.

Signed-off-by: default avatarWenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 76534860

Documentation/devicetree/bindings/watchdog/atmel-sama5d4-wdt.txt

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* Atmel SAMA5D4 Watchdog Timer (WDT) Controller



Required properties:

- compatible: "atmel,sama5d4-wdt"

- reg: base physical address and length of memory mapped region.



Optional properties:

- timeout-sec: watchdog timeout value (in seconds).

- interrupts: interrupt number to the CPU.

- atmel,watchdog-type: should be "hardware" or "software".

	"hardware": enable watchdog fault reset. A watchdog fault triggers

		    watchdog reset.

	"software": enable watchdog fault interrupt. A watchdog fault asserts

		    watchdog interrupt.

- atmel,idle-halt: present if you want to stop the watchdog when the CPU is

		   in 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: present if you want to stop the watchdog when the CPU is

		  in debug state.



Example:

	watchdog@fc068640 {

		compatible = "atmel,sama5d4-wdt";

		reg = <0xfc068640 0x10>;

		interrupts = <4 IRQ_TYPE_LEVEL_HIGH 5>;

		timeout-sec = <10>;

		atmel,watchdog-type = "hardware";

		atmel,dbg-halt;

		atmel,idle-halt;

		status = "okay";

	};