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Commit 9783c0d9 authored by Stephen Boyd's avatar Stephen Boyd
Browse files

clk: Allow providers to configure min/max rates 



clk providers are using the consumer APIs to set min/max rates on
the clock they're providing. To encourage clk providers to move
away from the consumer APIs, add a provider API to set the
min/max rate of a clock. The assumption is that this is done
before the clock can be requested via clk_get() and that the
clock rate is already within the boundaries of the min/max that's
configured.

Tested-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent 5c757456

drivers/clk/clk.c

+14 −2
Original line number Diff line number Diff line
@@ -58,6 +58,8 @@ struct clk_core { 
	unsigned long		flags;

	unsigned int		enable_count;

	unsigned int		prepare_count;

	unsigned long		min_rate;

	unsigned long		max_rate;

	unsigned long		accuracy;

	int			phase;

	struct hlist_head	children;
@@ -512,8 +514,8 @@ static void clk_core_get_boundaries(struct clk_core *core, 
{

	struct clk *clk_user;



	*min_rate = 0;

	*max_rate = ULONG_MAX;

	*min_rate = core->min_rate;

	*max_rate = core->max_rate;



	hlist_for_each_entry(clk_user, &core->clks, clks_node)

		*min_rate = max(*min_rate, clk_user->min_rate);
@@ -522,6 +524,14 @@ static void clk_core_get_boundaries(struct clk_core *core, 
		*max_rate = min(*max_rate, clk_user->max_rate);

}



void clk_hw_set_rate_range(struct clk_hw *hw, unsigned long min_rate,

			   unsigned long max_rate)

{

	hw->core->min_rate = min_rate;

	hw->core->max_rate = max_rate;

}

EXPORT_SYMBOL_GPL(clk_hw_set_rate_range);



/*

 * Helper for finding best parent to provide a given frequency. This can be used

 * directly as a determine_rate callback (e.g. for a mux), or from a more
@@ -2498,6 +2508,8 @@ struct clk *clk_register(struct device *dev, struct clk_hw *hw) 
	core->hw = hw;

	core->flags = hw->init->flags;

	core->num_parents = hw->init->num_parents;

	core->min_rate = 0;

	core->max_rate = ULONG_MAX;

	hw->core = core;



	/* allocate local copy in case parent_names is __initdata */

include/linux/clk-provider.h

+2 −0
Original line number Diff line number Diff line
@@ -619,6 +619,8 @@ int __clk_determine_rate(struct clk_hw *core, struct clk_rate_request *req); 
int __clk_mux_determine_rate_closest(struct clk_hw *hw,

				     struct clk_rate_request *req);

void clk_hw_reparent(struct clk_hw *hw, struct clk_hw *new_parent);

void clk_hw_set_rate_range(struct clk_hw *hw, unsigned long min_rate,

			   unsigned long max_rate);



static inline void __clk_hw_set_clk(struct clk_hw *dst, struct clk_hw *src)

{