firmware: arm_scmi: Add fast_switch_possible() interface
Add a new fast_switch_possible interface to the existing perf_ops to export the information of whether or not fast_switch is possible for a given device. This can be used by the cpufreq driver and framework to choose proper mechanism for frequency change. Link: https://lore.kernel.org/r/20200617094332.8391-1-nicola.mazzucato@arm.comSuggested-by: Lukasz Luba <lukasz.luba@arm.com> Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
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