[Qemu-arm] [RFC PATCH 2/6] qdev: add power/clock gating control on bus tree

[Damien Hedde]

Add functions [qdev|qbus]_set_[power|clock]_all(_fn).
Theses allow to control power and clock gating along a bus hierarchy.

Signed-off-by: Damien Hedde <address@hidden>
---
 include/hw/qdev-core.h | 20 +++++++++++++++++
 hw/core/qdev.c         | 51 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+)

diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 659287e185..607c367738 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -464,4 +464,24 @@ void device_set_power(DeviceState *dev, bool en);
  */
 void device_set_clock(DeviceState *dev, bool en);
 
+/**
+ * qdev/qbus_set_power_all(_fn)
+ * Enable/Disable the power of a tree starting
+ * at given device or bus
+ */
+void qdev_set_power_all(DeviceState *dev, bool en);
+void qdev_set_power_all_fn(void *opaque, bool en);
+void qbus_set_power_all(BusState *bus, bool en);
+void qbus_set_power_all_fn(void *opaque, bool en);
+
+/**
+ * qdev/qbus_set_clock_all(_fn)
+ * Enable/Disable the clock of a tree starting
+ * at given device or bus
+ */
+void qdev_set_clock_all(DeviceState *dev, bool en);
+void qdev_set_clock_all_fn(void *opaque, bool en);
+void qbus_set_clock_all(BusState *bus, bool en);
+void qbus_set_clock_all_fn(void *opaque, bool en);
+
 #endif
diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index bb6d36eab9..24b90bd45f 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -1138,6 +1138,57 @@ void device_set_clock(DeviceState *dev, bool en)
     }
 }
 
+static int qdev_set_power_one(DeviceState *dev, void *opaque)
+{
+    device_set_power(dev, *((bool *)opaque));
+    return 0;
+}
+
+void qdev_set_power_all(DeviceState *dev, bool en)
+{
+    qdev_walk_children(dev, NULL, NULL, qdev_set_power_one, NULL, &en);
+}
+
+void qdev_set_power_all_fn(void *opaque, bool en)
+{
+    qdev_set_power_all(DEVICE(opaque), en);
+}
+
+void qbus_set_power_all(BusState *bus, bool en)
+{
+    qbus_walk_children(bus, NULL, NULL, qdev_set_power_one, NULL, &en);
+}
+
+void qbus_set_power_all_fn(void *opaque, bool en)
+{
+    qbus_set_power_all(BUS(opaque), en);
+}
+
+static int qdev_set_clock_one(DeviceState *dev, void *opaque)
+{
+    device_set_clock(dev, *((bool *)opaque));
+    return 0;
+}
+
+void qdev_set_clock_all(DeviceState *dev, bool en)
+{
+    qdev_walk_children(dev, NULL, NULL, qdev_set_clock_one, NULL, &en);
+}
+
+void qdev_set_clock_all_fn(void *opaque, bool en)
+{
+    qdev_set_clock_all(DEVICE(opaque), en);
+}
+
+void qbus_set_clock_all(BusState *bus, bool en)
+{
+    qbus_walk_children(bus, NULL, NULL, qdev_set_clock_one, NULL, &en);
+}
+
+void qbus_set_clock_all_fn(void *opaque, bool en)
+{
+    qbus_set_clock_all(BUS(opaque), en);
+}
 
 Object *qdev_get_machine(void)
 {
-- 
2.18.0