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clk: add clk_set_parent()

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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.
This commit is contained in:
Philipp Tomsich
2018-01-08 11:15:08 +01:00
parent 1a7f6d4597
commit f7d1046da1
3 changed files with 31 additions and 0 deletions
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11
include/clk.h
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@@ -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.
*