Some systems want to set the interrupt of virtio_mmio device as a wakeup source. On such systems, we'll use the existence of the "wakeup-source" property as a signal of requirement. Signed-off-by: Minghao Xue <quic_mingxue@quicinc.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Message-Id: <1654851507-13891-2-git-send-email-quic_mingxue@quicinc.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Bug: 253945054 Change-Id: Ia0ffae3c1f7783a676ea5e302f19663a4a0c50d9 (cherry picked from commit 51ded7cdf26deea7dd875047c2f005b81e80bdf4) Signed-off-by: Minghao Xue <quic_mingxue@quicinc.com>