diff options
Diffstat (limited to 'doc/device-tree-bindings/watchdog')
| -rw-r--r-- | doc/device-tree-bindings/watchdog/gpio-wdt.txt | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/doc/device-tree-bindings/watchdog/gpio-wdt.txt b/doc/device-tree-bindings/watchdog/gpio-wdt.txt index c9a8559a3e..746c2c081e 100644 --- a/doc/device-tree-bindings/watchdog/gpio-wdt.txt +++ b/doc/device-tree-bindings/watchdog/gpio-wdt.txt @@ -5,7 +5,12 @@ Describes a simple watchdog timer which is reset by toggling a gpio. Required properties: - compatible: Must be "linux,wdt-gpio". -- gpios: gpio to toggle when wdt driver reset method is called. +- gpios: From common gpio binding; gpio connection to WDT reset pin. +- hw_algo: The algorithm used by the driver. Should be one of the + following values: + - toggle: Toggle from high-to-low or low-to-high when resetting the watchdog. + - level: Maintain a constant high/low level, and trigger a short pulse when + resetting the watchdog. Active level is determined by the GPIO flags. - always-running: Boolean property indicating that the watchdog cannot be disabled. At present, U-Boot only supports this kind of GPIO watchdog. @@ -15,5 +20,6 @@ Example: gpio-wdt { gpios = <&gpio0 1 0>; compatible = "linux,wdt-gpio"; + hw_algo = "toggle"; always-running; }; |