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watchdog: gpio_wdt: Add "always_running" feature to GPIO watchdog

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On some chips, like the TPS386000, the trigger cannot be disabled
and the CPU must keep toggling the line at all times. Add a switch
"always_running" to keep toggling the GPIO line regardless of the
state of the soft part of the watchdog. The "armed" member keeps
track of whether a timeout must also cause a reset.

Signed-off-by: Mike Looijmans <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>
This commit is contained in:
Mike Looijmans 2015-01-14 07:28:29 +01:00 • committed by Wim Van Sebroeck
commit ba804a9510
2 changed files with 34 additions and 8 deletions
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5
Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
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@ -13,6 +13,11 @@ Required Properties:
by the GPIO flags.
- hw_margin_ms: Maximum time to reset watchdog circuit (milliseconds).
Optional Properties:
- always-running: If the watchdog timer cannot be disabled, add this flag to
have the driver keep toggling the signal without a client. It will only cease
to toggle the signal when the device is open and the timeout elapsed.
Example:
watchdog: watchdog {
/* ADM706 */