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Introduce an identifier (cdev_id) for cooling devices registered from device tree. This prepares support for a new DT binding where cooling devices are identified by a tuple (device node, ID), instead of relying on child nodes. Existing users are updated to pass a default ID of 0, preserving the current behavior. Future changes will extend the cooling map parsing to match cooling devices based on both the device node and the ID. No functional change intended. Signed-off-by: Daniel Lezcano <daniel.lezcano@oss.qualcomm.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> Acked-by: Rafael J. Wysocki (Intel) <rafael@kernel.org> Link: https://patch.msgid.link/20260526140802.1059293-19-daniel.lezcano@oss.qualcomm.com