Commit 25399325 authored by Maxime Ripard's avatar Maxime Ripard Committed by Stephen Boyd
Browse files

clk: Introduce the clk_hw_get_rate_range function 



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: default avatarMaxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-24-maxime@cerno.tech


Tested-by: default avatarLinux Kernel Functional Testing <lkft@linaro.org>
Tested-by: default avatarNaresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent b46fd8db

drivers/clk/clk.c

+16 −0
Original line number Diff line number Diff line
@@ -684,6 +684,22 @@ 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)

include/linux/clk-provider.h

+2 −0
Original line number Diff line number Diff line
@@ -1267,6 +1267,8 @@ 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);