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Change https://lore.kernel.org/all/20230525113034.46880-1-tony@atomide.com registers serial core controller as a child of msm uart device. Since child should suspend first, due to the child's auto suspend delay (SERIAL_PORT_AUTOSUSPEND_DELAY_MS), additional 500msecs delay is added during msm_geni_serial_runtime_suspend. Added new optional dtsi property 'qcom,suspend-ignore-children' which when set ignores dependencies on children by PM framework, this helps to exit quickly from msm_geni_serial_runtime_suspend and save power. Change-Id: I36b239cf19293ee7b1ebecf32cdd0ad0749dbca1 Signed-off-by: Visweswara Tanuku <quic_vtanuku@quicinc.com>