In order to provide a way to know clock limits to clock providers.
The patch is needed for fixing commit 5d890c2df900 ("clk: rockchip:
add special approximation to fix up fractional clk's jitter").
Custom approximation function introduced by the patch, can
select frequency rate larger than one configured using
clk_set_max_rate().
Signed-off-by: Alexander Kochetkov <al.kochet at gmail.com>
---
drivers/clk/clk.c | 14 ++++++++------
include/linux/clk-provider.h | 2 ++
2 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index c8d83ac..8943aac 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -421,10 +421,11 @@ struct clk *__clk_lookup(const char *name)
return !core ? NULL : core->hw->clk;
}
-static void clk_core_get_boundaries(struct clk_core *core,
- unsigned long *min_rate,
- unsigned long *max_rate)
+void clk_hw_get_boundaries(struct clk_hw *hw,
+ unsigned long *min_rate,
+ unsigned long *max_rate)
{
+ struct clk_core *core = hw->core;
struct clk *clk_user;
*min_rate = core->min_rate;
@@ -436,6 +437,7 @@ static void clk_core_get_boundaries(struct clk_core *core,
hlist_for_each_entry(clk_user, &core->clks, clks_node)
*max_rate = min(*max_rate, clk_user->max_rate);
}
+EXPORT_SYMBOL_GPL(clk_hw_get_boundaries);
void clk_hw_set_rate_range(struct clk_hw *hw, unsigned long min_rate,
unsigned long max_rate)
@@ -894,7 +896,7 @@ unsigned long clk_hw_round_rate(struct clk_hw *hw, unsigned long rate)
int ret;
struct clk_rate_request req;
- clk_core_get_boundaries(hw->core, &req.min_rate, &req.max_rate);
+ clk_hw_get_boundaries(hw, &req.min_rate, &req.max_rate);
req.rate = rate;
ret = clk_core_round_rate_nolock(hw->core, &req);
@@ -924,7 +926,7 @@ long clk_round_rate(struct clk *clk, unsigned long rate)
clk_prepare_lock();
- clk_core_get_boundaries(clk->core, &req.min_rate, &req.max_rate);
+ clk_hw_get_boundaries(clk->core->hw, &req.min_rate, &req.max_rate);
req.rate = rate;
ret = clk_core_round_rate_nolock(clk->core, &req);
@@ -1353,7 +1355,7 @@ static struct clk_core *clk_calc_new_rates(struct clk_core *core,
if (parent)
best_parent_rate = parent->rate;
- clk_core_get_boundaries(core, &min_rate, &max_rate);
+ clk_hw_get_boundaries(core->hw, &min_rate, &max_rate);
/* find the closest rate and parent clk/rate */
if (core->ops->determine_rate) {
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 5100ec1..2f10999 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -755,6 +755,8 @@ int __clk_mux_determine_rate_closest(struct clk_hw *hw,
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);
+void clk_hw_get_boundaries(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)
{
--
1.7.9.5
