[Qemu-devel] [RFC PATCH 02/11] qemu-clk: allow to attach a clock to a device

[fred.konrad@greensocs.com]

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

This allows to attach 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>
---
 include/qemu/qemu-clock.h | 24 +++++++++++++++++++++++-
 qemu-clock.c              | 22 ++++++++++++++++++++++
 2 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/include/qemu/qemu-clock.h b/include/qemu/qemu-clock.h
index e7acd68..a2ba105 100644
--- a/include/qemu/qemu-clock.h
+++ b/include/qemu/qemu-clock.h
@@ -33,8 +33,30 @@
 typedef struct qemu_clk {
     /*< private >*/
     Object parent_obj;
+    char *name;            /* name of this clock in the device. */
 } *qemu_clk;
 
-#endif /* QEMU_CLOCK_H */
+/**
+ * qemu_clk_attach_to_device:
+ * @d: the device on which the clock need to be attached.
+ * @clk: the clock which need to be attached.
+ * @name: the name of the clock can't be NULL.
+ *
+ * Attach @clk named @name to the device @d.
+ *
+ */
+void qemu_clk_attach_to_device(DeviceState *d, qemu_clk clk,
+                               const char *name);
 
+/**
+ * qemu_clk_get_pin:
+ * @d: the device which contain the clock.
+ * @name: the name of the clock.
+ *
+ * Get the clock named @name located in the device @d, or NULL if not found.
+ *
+ * Returns the clock named @name contained in @d.
+ */
+qemu_clk qemu_clk_get_pin(DeviceState *d, const char *name);
 
+#endif /* QEMU_CLOCK_H */
diff --git a/qemu-clock.c b/qemu-clock.c
index 4a47fb4..81f2852 100644
--- a/qemu-clock.c
+++ b/qemu-clock.c
@@ -23,6 +23,7 @@
 
 #include "qemu/qemu-clock.h"
 #include "hw/hw.h"
+#include "qapi/error.h"
 
 /* #define DEBUG_QEMU_CLOCK */
 
@@ -33,6 +34,27 @@ do { printf("qemu-clock: " fmt , ## __VA_ARGS__); } while (0)
 #define DPRINTF(fmt, ...) do { } while (0)
 #endif
 
+void qemu_clk_attach_to_device(DeviceState *d, qemu_clk clk, const char *name)
+{
+    assert(name);
+    assert(!clk->name);
+    object_property_add_child(OBJECT(d), name, OBJECT(clk), &error_abort);
+    clk->name = g_strdup(name);
+}
+
+qemu_clk qemu_clk_get_pin(DeviceState *d, const char *name)
+{
+    gchar *path = NULL;
+    Object *clk;
+    bool ambiguous;
+
+    path = g_strdup_printf("%s/%s", object_get_canonical_path(OBJECT(d)),
+                           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,
-- 
2.5.5