[PATCH 01/16] clk: permit to define a custom parent for clk_hw_get_parent_index

Ansuel Smith
2022-03-13T19:05:14Z

Clk can have multiple parents. Some clk may require to get the cached
index of other parent that are not current associated with the clk.
Extend clk_hw_get_parent_index() with an optional parent to permit a
driver to get the cached index. If parent is NULL, the parent associated
with the provided hw clk is used.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
---
drivers/clk/clk.c | 14 +++++++++-----
drivers/clk/tegra/clk-periph.c | 2 +-
drivers/clk/tegra/clk-sdmmc-mux.c | 2 +-
drivers/clk/tegra/clk-super.c | 4 ++--
include/linux/clk-provider.h | 2 +-
5 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 8de6a22498e7..fe42f56bfbdf 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1711,15 +1711,19 @@ static int clk_fetch_parent_index(struct clk_core *core,
/**
* clk_hw_get_parent_index - return the index of the parent clock
* @hw: clk_hw associated with the clk being consumed
+ * @parent: optional clk_hw of the parent to be fetched
*
- * Fetches and returns the index of parent clock. Returns -EINVAL if the given
- * clock does not have a current parent.
+ * Fetches and returns the index of parent clock. If parent is not
+ * provided the parent of hw is used.
+ * Returns -EINVAL if the given clock does not have a current parent.
*/
-int clk_hw_get_parent_index(struct clk_hw *hw)
+int clk_hw_get_parent_index(struct clk_hw *hw, struct clk_hw *parent)
{
- struct clk_hw *parent = clk_hw_get_parent(hw);
+ /* With parent NULL get the current parent of hw */
+ if (!parent)
+ parent = clk_hw_get_parent(hw);

- if (WARN_ON(parent == NULL))
+ if (WARN_ON(!parent))
return -EINVAL;

return clk_fetch_parent_index(hw->core, parent->core);
diff --git a/drivers/clk/tegra/clk-periph.c b/drivers/clk/tegra/clk-periph.c
index 79ca3aa072b7..0fecdbbaca8f 100644
--- a/drivers/clk/tegra/clk-periph.c
+++ b/drivers/clk/tegra/clk-periph.c
@@ -116,7 +116,7 @@ static void clk_periph_restore_context(struct clk_hw *hw)
struct clk_hw *div_hw = &periph->divider.hw;
int parent_id;

- parent_id = clk_hw_get_parent_index(hw);
+ parent_id = clk_hw_get_parent_index(hw, NULL);
if (WARN_ON(parent_id < 0))
return;

diff --git a/drivers/clk/tegra/clk-sdmmc-mux.c b/drivers/clk/tegra/clk-sdmmc-mux.c
index 4f2c3309eea4..6013ca8444f4 100644
--- a/drivers/clk/tegra/clk-sdmmc-mux.c
+++ b/drivers/clk/tegra/clk-sdmmc-mux.c
@@ -210,7 +210,7 @@ static void clk_sdmmc_mux_restore_context(struct clk_hw *hw)
unsigned long rate = clk_hw_get_rate(hw);
int parent_id;

- parent_id = clk_hw_get_parent_index(hw);
+ parent_id = clk_hw_get_parent_index(hw, NULL);
if (WARN_ON(parent_id < 0))
return;

diff --git a/drivers/clk/tegra/clk-super.c b/drivers/clk/tegra/clk-super.c
index a98a420398fa..27cbbc09ef68 100644
--- a/drivers/clk/tegra/clk-super.c
+++ b/drivers/clk/tegra/clk-super.c
@@ -128,7 +128,7 @@ static void clk_super_mux_restore_context(struct clk_hw *hw)
{
int parent_id;

- parent_id = clk_hw_get_parent_index(hw);
+ parent_id = clk_hw_get_parent_index(hw, NULL);
if (WARN_ON(parent_id < 0))
return;

@@ -180,7 +180,7 @@ static void clk_super_restore_context(struct clk_hw *hw)
struct clk_hw *div_hw = &super->frac_div.hw;
int parent_id;

- parent_id = clk_hw_get_parent_index(hw);
+ parent_id = clk_hw_get_parent_index(hw, NULL);
if (WARN_ON(parent_id < 0))
return;

diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 2faa6f7aa8a8..65b2850c09be 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -1198,7 +1198,7 @@ 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_get_parent_index(struct clk_hw *hw, struct clk_hw *parent);
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);
--
2.34.1