Re: [PATCH] Add support for always enabled watchdog timers

[Evgeny Boger]

On 08/23/2014 09:33 PM, Guenter Roeck wrote:
> On 08/23/2014 10:25 AM, Alexander Shiyan wrote:
> > Sat, 23 Aug 2014 10:16:08 -0700 ÐÑ Guenter Roeck <linux@xxxxxxxxxxxx>:
> > > On 08/16/2014 05:45 PM, Evgeny Boger wrote:
> > > > From: Evgeny Boger <boger@xxxxxxxxxxxxxx>
> > > >
> > > > Add option to use with watchdog timers which are always enabled
> > > > in hardware, i.e. there is no way to enable/disable it via GPIO pin.
> > > > The driver will start pinging WDT immediately upon loading
> > > > and will continue to do so even after stopping the watchdog.
> > > The headline needs a reference to the affected driver.
> > >
> > > Also, please copy the dt mailing list and maintainers.
> > >
> > > > Signed-off-by: Evgeny Boger <boger@xxxxxxxxxxxxxx>
> > > > ---
> > > >    .../devicetree/bindings/watchdog/gpio-wdt.txt      | 14 ++++++-
> > > >    drivers/watchdog/gpio_wdt.c                        | 45 
> > > > +++++++++++++++++-----
> > > >    2 files changed, 48 insertions(+), 11 deletions(-)
> > > >
> > > > diff --git 
> > > > a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt 
> > > > b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
> > > > index 37afec1..1f8ca46 100644
> > > > --- a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
> > > > +++ b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
> > > > @@ -12,8 +12,11 @@ Required Properties:
> > > >        the opposite level disables the WDT. Active level is determined
> > > >        by the GPIO flags.
> > > >    - hw_margin_ms: Maximum time to reset watchdog circuit 
> > > > (milliseconds).
> > > > +- always-enabled: Use with wathdog timer which is always enabled
> >
> > Similar to NOWAYOUT?
> I think this one is different. NOWAYOUT is a software flag, while
> the flag here is supposed to mean that the hardware watchdog
> is always enabled and running, and can not be disabled. Or at least
> this is my understanding.

exactly

> Guenter


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