[PATCH v6 26/28] clk: Introduce the clk_hw_get_rate_range function

Maxime Ripard
2022-07-11T15:25:19Z

Some clock providers are hand-crafting their clk_rate_request, and need
to figure out the current boundaries of their clk_hw to fill it
properly.

Let's create such a function for clock providers.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
drivers/clk/clk.c | 16 ++++++++++++++++
include/linux/clk-provider.h | 2 ++
2 files changed, 18 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 77601f435f12..5bdfd645f1dc 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -683,6 +683,22 @@ static void clk_core_get_boundaries(struct clk_core *core,
*max_rate = min(*max_rate, clk_user->max_rate);
}

+/*
+ * clk_hw_get_rate_range() - returns the clock rate range for a hw clk
+ * @hw: the hw clk we want to get the range from
+ * @min_rate: pointer to the variable that will hold the minimum
+ * @max_rate: pointer to the variable that will hold the maximum
+ *
+ * Fills the @min_rate and @max_rate variables with the minimum and
+ * maximum that clock can reach.
+ */
+void clk_hw_get_rate_range(struct clk_hw *hw, unsigned long *min_rate,
+ unsigned long *max_rate)
+{
+ clk_core_get_boundaries(hw->core, min_rate, max_rate);
+}
+EXPORT_SYMBOL_GPL(clk_hw_get_rate_range);
+
static bool clk_core_check_boundaries(struct clk_core *core,
unsigned long min_rate,
unsigned long max_rate)
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 0bfebea2a50a..1e38886a2916 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -1233,6 +1233,8 @@ int clk_mux_determine_rate_flags(struct clk_hw *hw,
struct clk_rate_request *req,
unsigned long flags);
void clk_hw_reparent(struct clk_hw *hw, struct clk_hw *new_parent);
+void clk_hw_get_rate_range(struct clk_hw *hw, unsigned long *min_rate,
+ unsigned long *max_rate);
void clk_hw_set_rate_range(struct clk_hw *hw, unsigned long min_rate,
unsigned long max_rate);

--
2.36.1