[PATCH v9 07/22] clk: Add API to get index of the clock parent
From: Sowjanya Komatineni <skomatineni@nvidia.com>
Date: 2019-08-16 19:42:35
Also in:
linux-clk, linux-gpio, linux-pm, linux-tegra, lkml
Subsystem:
common clk framework, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Linus Torvalds
This patch adds an API clk_hw_get_parent_index to get index of the clock parent to use during the clock restore operations on system resume. Reviewed-by: Thierry Reding <redacted> Reviewed-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com> --- drivers/clk/clk.c | 17 +++++++++++++++++ include/linux/clk-provider.h | 1 + 2 files changed, 18 insertions(+)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index cbcc333aec84..12ad0e9b8591 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c@@ -1645,6 +1645,23 @@ static int clk_fetch_parent_index(struct clk_core *core, return i; } +/** + * clk_hw_get_parent_index - return the index of parent clock + * @hw: clk_hw associated with the clk being consumed + * @parent_hw: clk_hw associated with the parent of clk + * + * Fetches and returns the index of parent clock. + * If hw or parent_hw is NULL, returns -EINVAL. + */ +int clk_hw_get_parent_index(struct clk_hw *hw, struct clk_hw *parent_hw) +{ + if (!hw || !parent_hw) + return -EINVAL; + + return clk_fetch_parent_index(hw->core, parent_hw->core); +} +EXPORT_SYMBOL_GPL(clk_hw_get_parent_index); + /* * Update the orphan status of @core and all its children. */
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index dce5521a9bf6..cce830780900 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h@@ -817,6 +817,7 @@ 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, struct clk_hw *parent_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);
--
2.7.4