qdev: add clock input&output support to devices.

Add functions to easily handle clocks with devices.
Clock inputs and outputs should be used to handle clock propagation
between devices.
The API is very similar the GPIO API.

This is based on the original work of Frederic Konrad.

Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20200406135251.157596-4-damien.hedde@greensocs.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index 85f062def7..dd77a56067 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -37,6 +37,7 @@
 #include "hw/qdev-properties.h"
 #include "hw/boards.h"
 #include "hw/sysbus.h"
+#include "hw/qdev-clock.h"
 #include "migration/vmstate.h"
 #include "trace.h"
 
@@ -855,6 +856,7 @@ static void device_set_realized(Object *obj, bool value, Error **errp)
     DeviceClass *dc = DEVICE_GET_CLASS(dev);
     HotplugHandler *hotplug_ctrl;
     BusState *bus;
+    NamedClockList *ncl;
     Error *local_err = NULL;
     bool unattached_parent = false;
     static int unattached_count;
@@ -902,6 +904,13 @@ static void device_set_realized(Object *obj, bool value, Error **errp)
          */
         g_free(dev->canonical_path);
         dev->canonical_path = object_get_canonical_path(OBJECT(dev));
+        QLIST_FOREACH(ncl, &dev->clocks, node) {
+            if (ncl->alias) {
+                continue;
+            } else {
+                clock_setup_canonical_path(ncl->clock);
+            }
+        }
 
         if (qdev_get_vmsd(dev)) {
             if (vmstate_register_with_alias_id(VMSTATE_IF(dev),
@@ -1025,6 +1034,7 @@ static void device_initfn(Object *obj)
     dev->allow_unplug_during_migration = false;
 
     QLIST_INIT(&dev->gpios);
+    QLIST_INIT(&dev->clocks);
 }
 
 static void device_post_init(Object *obj)
@@ -1054,6 +1064,8 @@ static void device_finalize(Object *obj)
          */
     }
 
+    qdev_finalize_clocklist(dev);
+
     /* Only send event if the device had been completely realized */
     if (dev->pending_deleted_event) {
         g_assert(dev->canonical_path);