Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / watchdog / atmel-wdt.txt

diff --git a/kernel/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt b/kernel/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
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+* 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.
+       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>;
+               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";
+       };