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dts: Documentation: AT91 Watchdog, explain what atmel,idle-halt property really do

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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>
This commit is contained in:
Sylvain Rochet 2015-01-18 14:26:50 +01:00 committed by Nicolas Ferre
parent efff4b1a5a
commit 566084007d
1 changed files with 5 additions and 0 deletions
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5
Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
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@ -26,6 +26,11 @@ Optional properties:
- 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.