From: KONRAD Frederic <fred.konrad@greensocs.com>

This allows to add a clock to a DeviceState.
Contrary to gpios, the clock pins are not contained in the DeviceState but
with the child property so they can appears in the qom-tree.

Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>

V2 -> V3:
  * s/qemu_clk/QEMUClock/g
V1 -> V2:
  * Rename the function use 'add' instead of 'attach'
---
 include/qemu/qemu-clock.h | 24 +++++++++++++++++++++++-
 qemu-clock.c              | 23 +++++++++++++++++++++++
 2 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/include/qemu/qemu-clock.h b/include/qemu/qemu-clock.h
index 446a490..ffe743d 100644
--- a/include/qemu/qemu-clock.h
+++ b/include/qemu/qemu-clock.h
@@ -33,8 +33,30 @@
 typedef struct QEMUClock {
     /*< private >*/
     Object parent_obj;
+    char *name;            /* name of this clock in the device. */
 } QEMUClock;
 
-#endif /* QEMU_CLOCK_H */
+/**
+ * qemu_clk_device_add_clock:
+ * @dev: the device on which the clock needs to be added.
+ * @clk: the clock which needs to be added.
+ * @name: the name of the clock can't be NULL.
+ *
+ * Add @clk to device @dev as a clock named @name.
+ *
+ */
+void qemu_clk_device_add_clock(DeviceState *dev, QEMUClock *clk,
+                               const char *name);
 
+/**
+ * qemu_clk_device_get_clock:
+ * @dev: the device which contains the clock.
+ * @name: the name of the clock.
+ *
+ * Get the clock named @name contained in the device @dev, or NULL if not found.
+ *
+ * Returns the clock named @name contained in @dev.
+ */
+QEMUClock *qemu_clk_device_get_clock(DeviceState *dev, const char *name);
 
+#endif /* QEMU_CLOCK_H */
diff --git a/qemu-clock.c b/qemu-clock.c
index 3bef144..6eeecf3 100644
--- a/qemu-clock.c
+++ b/qemu-clock.c
@@ -25,6 +25,7 @@
 #include "qemu/qemu-clock.h"
 #include "hw/hw.h"
 #include "qemu/log.h"
+#include "qapi/error.h"
 
 #ifndef DEBUG_QEMU_CLOCK
 #define DEBUG_QEMU_CLOCK 0
@@ -36,6 +37,28 @@
     }                                                                        \
 } while (0);
 
+void qemu_clk_device_add_clock(DeviceState *dev, QEMUClock *clk,
+                               const char *name)
+{
+    assert(name);
+    assert(!clk->name);
+    object_property_add_child(OBJECT(dev), name, OBJECT(clk), &error_abort);
+    clk->name = g_strdup(name);
+}
+
+QEMUClock *qemu_clk_device_get_clock(DeviceState *dev, const char *name)
+{
+    gchar *path = NULL;
+    Object *clk;
+    bool ambiguous;
+
+    path = g_strdup_printf("%s/%s", object_get_canonical_path(OBJECT(dev)),
+                           name);
+    clk = object_resolve_path(path, &ambiguous);
+    g_free(path);
+    return QEMU_CLOCK(clk);
+}
+
 static const TypeInfo qemu_clk_info = {
     .name          = TYPE_CLOCK,
     .parent        = TYPE_OBJECT,
-- 
1.8.3.1