firmware: arm_scpi: add support for device power state management
SCPI protocol supports device power state management. This deals with power states of various peripheral devices in the system other than the core compute subsystem. This patch adds support for the power state management of those peripheral devices. Tested-by: NMathieu Poirier <mathieu.poirier@linaro.org> Tested-by: NJon Medhurst <tixy@linaro.org> Reviewed-by: NJon Medhurst <tixy@linaro.org> Reviewed-by: NKevin Hilman <khilman@baylibre.com> Reviewed-by: NUlf Hansson <ulf.hansson@linaro.org> Signed-off-by: NSudeep Holla <sudeep.holla@arm.com>
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