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clk: Changes for v5.5-rc1

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Contains a single core API addition that allows clock providers to query
 the parent index for a given struct clk_hw. This is used to implement
 suspend/resume support on Tegra SoCs.
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Merge tag 'tegra-for-5.5-clk-core-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into clk-hw-parent-index

Pull clk framework change from Thierry Reding:

Contains a single core API addition that allows clock providers to query
the parent index for a given struct clk_hw. This is used to implement
suspend/resume support on Tegra SoCs.

* tag 'tegra-for-5.5-clk-core-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
  clk: Add API to get index of the clock parent
This commit is contained in:
Stephen Boyd 2019-11-13 11:16:58 -08:00
commit 55ae8a11ee
2 changed files with 19 additions and 0 deletions
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18
drivers/clk/clk.c
View file

@ -1674,6 +1674,24 @@ static int clk_fetch_parent_index(struct clk_core *core,
return i;
}
/**
* clk_hw_get_parent_index - return the index of the parent clock
* @hw: clk_hw associated with the clk being consumed
*
* Fetches and returns the index of parent clock. Returns -EINVAL if the given
* clock does not have a current parent.
*/
int clk_hw_get_parent_index(struct clk_hw *hw)
{
struct clk_hw *parent = clk_hw_get_parent(hw);
if (WARN_ON(parent == NULL))
return -EINVAL;
return clk_fetch_parent_index(hw->core, parent->core);
}
EXPORT_SYMBOL_GPL(clk_hw_get_parent_index);
/*
* Update the orphan status of @core and all its children.
*/

1
include/linux/clk-provider.h
View file

@ -818,6 +818,7 @@ unsigned int clk_hw_get_num_parents(const struct clk_hw *hw);
struct clk_hw *clk_hw_get_parent(const struct clk_hw *hw);
struct clk_hw *clk_hw_get_parent_by_index(const struct clk_hw *hw,
unsigned int index);
int clk_hw_get_parent_index(struct clk_hw *hw);
int clk_hw_set_parent(struct clk_hw *hw, struct clk_hw *new_parent);
unsigned int __clk_get_enable_count(struct clk *clk);
unsigned long clk_hw_get_rate(const struct clk_hw *hw);