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The _UID object is optional, but is required when the device has no other way to report a persistent unique device ID. This patch is required for ACPI 5.0 ACPI enumerated IP cores. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rui Zhang <rui.zhang@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>