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The interconnect controller hardware may support querying the current bandwidth settings, so add a callback for providers to implement this functionality if supported. Link: https://lore.kernel.org/r/20200825170152.6434-2-georgi.djakov@linaro.org Reviewed-by: Saravana Kannan <saravanak@google.com> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>