Clean-ups: qom-ify serial and remove QDEV_PROP_PTR Hi, QDEV_PROP_PTR is marked in multiple places as "FIXME/TODO/remove me". In most cases, it can be easily replaced with QDEV_PROP_LINK when the pointer points to an Object. There are a few places where such substitution isn't possible. For those places, it seems reasonable to use a specific setter method instead, and keep the user_creatable = false. In other places, proper usage of qdev or other facilies is the solution. The serial code wasn't converted to qdev, which makes it a bit more archaic to deal with. Let's convert it first, so we can more easily embed it from other devices, and re-export some properties and drop QDEV_PROP_PTR usage.