The driver supports both level triggered and edge triggered power off.
At driver load time, the driver will request the given gpio line and
-install a pm_power_off handler. If the optional properties 'input' is
-not found, the GPIO line will be driven in the inactive
+install a handler to power off the system. If the optional properties
+'input' is not found, the GPIO line will be driven in the inactive
state. Otherwise its configured as an input.
-When the pm_power_off is called, the gpio is configured as an output,
-and drive active, so triggering a level triggered power off
+When the power-off handler is called, the gpio is configured as an
+output, and drive active, so triggering a level triggered power off
condition. This will also cause an inactive->active edge condition, so
triggering positive edge triggered power off. After a delay of 100ms,
the GPIO is set to inactive, thus causing an active->inactive edge,
Optional properties:
- input : Initially configure the GPIO line as an input. Only reconfigure
- it to an output when the pm_power_off function is called. If this optional
+ it to an output when the power-off handler is called. If this optional
property is not specified, the GPIO is initialized as an output in its
inactive state.