From: boris.brezillon@free-electrons.com (Boris Brezillon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCHv2 1/2] dts: Documentation: AT91 Watchdog, explain what atmel,idle-halt property really do
Date: Thu, 22 Jan 2015 19:14:03 +0100 [thread overview]
Message-ID: <20150122191403.322059e3@bbrezillon> (raw)
In-Reply-To: <1421587611-32708-2-git-send-email-sylvain.rochet@finsecur.com>
On Sun, 18 Jan 2015 14:26:50 +0100
Sylvain Rochet <sylvain.rochet@finsecur.com> wrote:
> 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>
> ---
> Documentation/devicetree/bindings/watchdog/atmel-wdt.txt | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt b/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
> index f90e294..a4d8697 100644
> --- a/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
> +++ b/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
> @@ -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.
>
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
next prev parent reply other threads:[~2015-01-22 18:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-17 21:49 [PATCH] AT91: DT: Watchdog, remove property idle halt by default Sylvain Rochet
2015-01-18 8:08 ` Boris Brezillon
2015-01-18 13:26 ` [PATCHv2 0/2] dts: AT91 " Sylvain Rochet
2015-01-18 13:26 ` [PATCHv2 1/2] dts: Documentation: AT91 Watchdog, explain what atmel, idle-halt property really do Sylvain Rochet
2015-01-22 18:14 ` Boris Brezillon [this message]
2015-01-18 13:26 ` [PATCHv2 2/2] dts: AT91 Watchdog, remove property idle halt by default Sylvain Rochet
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