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Add the core SCMI notifications callbacks-registration support: allow users to register their own callbacks against the desired events. Whenever a registration request is issued against a still non existent event, mark such request as pending for later processing, in order to account for possible late initializations of SCMI Protocols associated to loadable drivers. Link: https://lore.kernel.org/r/20200701155348.52864-3-cristian.marussi@arm.com Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>