clk: add clk_set_parent()
Clocks may support multiple parents: this change introduces an
optional operation on the clk-uclass to set a clock's parent.
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: David Wu <david.wu@rock-chips.com>
Series-changes: 2
- Fixed David's email address.
diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c
index fbea720..20ee0c5 100644
--- a/drivers/clk/clk-uclass.c
+++ b/drivers/clk/clk-uclass.c
@@ -188,6 +188,18 @@
return ops->set_rate(clk, rate);
}
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+ const struct clk_ops *ops = clk_dev_ops(clk->dev);
+
+ debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
+
+ if (!ops->set_parent)
+ return -ENOSYS;
+
+ return ops->set_parent(clk, parent);
+}
+
int clk_enable(struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
diff --git a/include/clk-uclass.h b/include/clk-uclass.h
index e7ea334..75933eb 100644
--- a/include/clk-uclass.h
+++ b/include/clk-uclass.h
@@ -78,6 +78,14 @@
*/
ulong (*set_rate)(struct clk *clk, ulong rate);
/**
+ * set_parent() - Set current clock parent
+ *
+ * @clk: The clock to manipulate.
+ * @parent: New clock parent.
+ * @return zero on success, or -ve error code.
+ */
+ int (*set_parent)(struct clk *clk, struct clk *parent);
+ /**
* enable() - Enable a clock.
*
* @clk: The clock to manipulate.
diff --git a/include/clk.h b/include/clk.h
index e7ce3e8..e463d8e 100644
--- a/include/clk.h
+++ b/include/clk.h
@@ -178,6 +178,17 @@
ulong clk_set_rate(struct clk *clk, ulong rate);
/**
+ * clk_set_parent() - Set current clock parent.
+ *
+ * @clk: A clock struct that was previously successfully requested by
+ * clk_request/get_by_*().
+ * @parent: A clock struct that was previously successfully requested by
+ * clk_request/get_by_*().
+ * @return new rate, or -ve error code.
+ */
+int clk_set_parent(struct clk *clk, struct clk *parent);
+
+/**
* clk_enable() - Enable (turn on) a clock.
*
* @clk: A clock struct that was previously successfully requested by