ppc/pnv: populate the DT with realized XSCOM devices

Some devices could be initialized in the instance_init handler but not
realized for configuration reasons. Nodes should not be added in the DT
for such devices.
Signed-off-by: NCédric Le Goater <clg@kaod.org>
Message-Id: <20191210135845.19773-3-clg@kaod.org>
Reviewed-by: NGreg Kurz <groug@kaod.org>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

hw/ppc/pnv_xscom.c

@@ -304,7 +304,10 @@ static int xscom_dt_child(Object *child, void *opaque)
         PnvXScomInterface *xd = PNV_XSCOM_INTERFACE(child);
         PnvXScomInterfaceClass *xc = PNV_XSCOM_INTERFACE_GET_CLASS(xd);
 
-        if (xc->dt_xscom) {
+        /*
+         * Only "realized" devices should be configured in the DT
+         */
+        if (xc->dt_xscom && DEVICE(child)->realized) {
             _FDT((xc->dt_xscom(xd, args->fdt, args->xscom_offset)));
         }
     }