path: root/Documentation
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authorMike Looijmans <mike.looijmans@topic.nl>2015-01-14 07:28:29 +0100
committerWim Van Sebroeck <wim@iguana.be>2015-02-17 21:33:22 +0100
commitba804a9510df555c42c2be6c340960879afe39d2 (patch)
tree39ddf8b02b9004c5f9124c5ebd2eae23e149344c /Documentation
parent396f163ceba3ac2829e3076764efcfb10797293c (diff)
watchdog: gpio_wdt: Add "always_running" feature to GPIO watchdog
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 <mike.looijmans@topic.nl> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'Documentation')
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
index 37afec194949..198794963786 100644
--- a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
@@ -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.
watchdog: watchdog {
/* ADM706 */

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