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@theobroma-systems.com ---
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 fbea720..20ee0c5 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 e7ea334..75933eb 100644 --- a/include/clk-uclass.h +++ b/include/clk-uclass.h @@ -78,6 +78,14 @@ struct clk_ops { */ 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_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. * * @clk: A clock struct that was previously successfully requested by