From f7d1046da18fd03a047b5f4d290a8ab8550ebf73 Mon Sep 17 00:00:00 2001
From: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Date: Mon, 8 Jan 2018 11:15:08 +0100
Subject: [PATCH] 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.
---
drivers/clk/clk-uclass.c | 12 ++++++++++++
include/clk-uclass.h | 8 ++++++++
include/clk.h | 11 +++++++++++
3 files changed, 31 insertions(+)
diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c
index fbea72091b..20ee0c5424 100644
--- a/drivers/clk/clk-uclass.c
+++ b/drivers/clk/clk-uclass.c
@@ -188,6 +188,18 @@ ulong clk_set_rate(struct clk *clk, ulong rate)
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 e7ea334c60..75933eb884 100644
--- a/include/clk-uclass.h
+++ b/include/clk-uclass.h
@@ -77,6 +77,14 @@ struct clk_ops {
* @return new rate, or -ve error code.
*/
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.
*
diff --git a/include/clk.h b/include/clk.h
index e7ce3e8576..e463d8e60d 100644
--- a/include/clk.h
+++ b/include/clk.h
@@ -177,6 +177,17 @@ ulong clk_get_rate(struct clk *clk);
*/
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.
*
--
2.39.5