Peter A. Bigot 13f96d439e sys: onoff: support clients using synchronous transitions ... The on-off manager infrastructure is designed to robust asynchronous transition between binary states where multiple clients may be initiating a transition from any context. The actual transition is performed using a manager that tracks the current state and pending operations. Requests are initiated by passing a reference to an onoff_client object that holds client state including the notification mechanism. This API may be used in subsystems where the transitions for a particular driver are always synchronous and isr-ok, e.g. setting a SoC-controlled GPIO. In this situation the full on-off manager infrastructure is wasteful. All we need is a record of the service state: off, active count, or error. Add a data structure and an API that can be used to replace the onoff manager functionality in a situation where all transitions are isr-ok and synchronous while retaining compatible behavior from the client perspective. Signed-off-by: Peter A. Bigot <pab@pabigot.com>		2020-08-14 17:53:39 +02:00
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