And rename "it_shift" field to "regshift", as it seems to be more
popular for this (and I don't know what "it" stands for).

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 hw/char/serial.c         | 23 ++++++++++++++++++-----
 include/hw/char/serial.h |  2 +-
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/hw/char/serial.c b/hw/char/serial.c
index 4fc2bcedf1..18ca79ccf3 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -1026,7 +1026,7 @@ static uint64_t serial_mm_read(void *opaque, hwaddr addr,
                                unsigned size)
 {
     SerialMMState *s = SERIAL_MM(opaque);
-    return serial_ioport_read(s, addr >> s->it_shift, 1);
+    return serial_ioport_read(s, addr >> s->regshift, 1);
 }
 
 static void serial_mm_write(void *opaque, hwaddr addr,
@@ -1034,7 +1034,7 @@ static void serial_mm_write(void *opaque, hwaddr addr,
 {
     SerialMMState *s = SERIAL_MM(opaque);
     value &= 255;
-    serial_ioport_write(s, addr >> s->it_shift, value, 1);
+    serial_ioport_write(s, addr >> s->regshift, value, 1);
 }
 
 static const MemoryRegionOps serial_mm_ops[3] = {
@@ -1062,7 +1062,7 @@ static const MemoryRegionOps serial_mm_ops[3] = {
 };
 
 SerialState *serial_mm_init(MemoryRegion *address_space,
-                            hwaddr base, int it_shift,
+                            hwaddr base, int regshift,
                             qemu_irq irq, int baudbase,
                             Chardev *chr, enum device_endian end)
 {
@@ -1070,26 +1070,39 @@ SerialState *serial_mm_init(MemoryRegion *address_space,
     SerialMMState *m = SERIAL_MM(dev);
     SerialState *s = SERIAL(dev);
 
-    m->it_shift = it_shift;
     s->irq = irq;
     s->baudbase = baudbase;
     qdev_prop_set_chr(dev, "chardev", chr);
+    qdev_prop_set_uint8(dev, "regshift", regshift);
 
     serial_realize_core(s, &error_fatal);
     qdev_set_legacy_instance_id(DEVICE(s), base, 2);
     qdev_init_nofail(dev);
 
     memory_region_init_io(&s->io, NULL, &serial_mm_ops[end], s,
-                          "serial", 8 << it_shift);
+                          "serial", 8 << m->regshift);
     memory_region_add_subregion(address_space, base, &s->io);
 
     return s;
 }
 
+static Property serial_mm_properties[] = {
+    DEFINE_PROP_UINT8("regshift", SerialMMState, regshift, 0),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void serial_mm_class_init(ObjectClass *klass, void* data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->props = serial_mm_properties;
+}
+
 static const TypeInfo serial_mm_info = {
     .name = TYPE_SERIAL_MM,
     .parent = TYPE_SERIAL,
     .instance_size = sizeof(SerialMMState),
+    .class_init = serial_mm_class_init,
 };
 
 static void serial_register_types(void)
diff --git a/include/hw/char/serial.h b/include/hw/char/serial.h
index 62962e3c5a..613879ced8 100644
--- a/include/hw/char/serial.h
+++ b/include/hw/char/serial.h
@@ -82,7 +82,7 @@ typedef struct SerialState {
 typedef struct SerialMMState {
     SerialState parent;
 
-    int it_shift;
+    uint8_t regshift;
 } SerialMMState;
 
 extern const VMStateDescription vmstate_serial;
-- 
2.23.0.606.g08da6496b6