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path: root/drivers/clk/clk-composite.c
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-rw-r--r--drivers/clk/clk-composite.c206
1 files changed, 176 insertions, 30 deletions
diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c
index 46604214bba0..66759fe28fad 100644
--- a/drivers/clk/clk-composite.c
+++ b/drivers/clk/clk-composite.c
@@ -3,8 +3,8 @@
* Copyright (c) 2013 NVIDIA CORPORATION. All rights reserved.
*/
-#include <linux/clk.h>
#include <linux/clk-provider.h>
+#include <linux/device.h>
#include <linux/err.h>
#include <linux/slab.h>
@@ -42,6 +42,29 @@ static unsigned long clk_composite_recalc_rate(struct clk_hw *hw,
return rate_ops->recalc_rate(rate_hw, parent_rate);
}
+static int clk_composite_determine_rate_for_parent(struct clk_hw *rate_hw,
+ struct clk_rate_request *req,
+ struct clk_hw *parent_hw,
+ const struct clk_ops *rate_ops)
+{
+ long rate;
+
+ req->best_parent_hw = parent_hw;
+ req->best_parent_rate = clk_hw_get_rate(parent_hw);
+
+ if (rate_ops->determine_rate)
+ return rate_ops->determine_rate(rate_hw, req);
+
+ rate = rate_ops->round_rate(rate_hw, req->rate,
+ &req->best_parent_rate);
+ if (rate < 0)
+ return rate;
+
+ req->rate = rate;
+
+ return 0;
+}
+
static int clk_composite_determine_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
@@ -51,54 +74,62 @@ static int clk_composite_determine_rate(struct clk_hw *hw,
struct clk_hw *rate_hw = composite->rate_hw;
struct clk_hw *mux_hw = composite->mux_hw;
struct clk_hw *parent;
- unsigned long parent_rate;
- long tmp_rate, best_rate = 0;
unsigned long rate_diff;
unsigned long best_rate_diff = ULONG_MAX;
- long rate;
- int i;
+ unsigned long best_rate = 0;
+ int i, ret;
- if (rate_hw && rate_ops && rate_ops->determine_rate) {
- __clk_hw_set_clk(rate_hw, hw);
- return rate_ops->determine_rate(rate_hw, req);
- } else if (rate_hw && rate_ops && rate_ops->round_rate &&
- mux_hw && mux_ops && mux_ops->set_parent) {
+ if (rate_hw && rate_ops &&
+ (rate_ops->determine_rate || rate_ops->round_rate) &&
+ mux_hw && mux_ops && mux_ops->set_parent) {
req->best_parent_hw = NULL;
if (clk_hw_get_flags(hw) & CLK_SET_RATE_NO_REPARENT) {
+ struct clk_rate_request tmp_req;
+
parent = clk_hw_get_parent(mux_hw);
- req->best_parent_hw = parent;
- req->best_parent_rate = clk_hw_get_rate(parent);
- rate = rate_ops->round_rate(rate_hw, req->rate,
- &req->best_parent_rate);
- if (rate < 0)
- return rate;
+ clk_hw_forward_rate_request(hw, req, parent, &tmp_req, req->rate);
+ ret = clk_composite_determine_rate_for_parent(rate_hw,
+ &tmp_req,
+ parent,
+ rate_ops);
+ if (ret)
+ return ret;
+
+ req->rate = tmp_req.rate;
+ req->best_parent_hw = tmp_req.best_parent_hw;
+ req->best_parent_rate = tmp_req.best_parent_rate;
- req->rate = rate;
return 0;
}
for (i = 0; i < clk_hw_get_num_parents(mux_hw); i++) {
+ struct clk_rate_request tmp_req;
+
parent = clk_hw_get_parent_by_index(mux_hw, i);
if (!parent)
continue;
- parent_rate = clk_hw_get_rate(parent);
-
- tmp_rate = rate_ops->round_rate(rate_hw, req->rate,
- &parent_rate);
- if (tmp_rate < 0)
+ clk_hw_forward_rate_request(hw, req, parent, &tmp_req, req->rate);
+ ret = clk_composite_determine_rate_for_parent(rate_hw,
+ &tmp_req,
+ parent,
+ rate_ops);
+ if (ret)
continue;
- rate_diff = abs(req->rate - tmp_rate);
+ if (req->rate >= tmp_req.rate)
+ rate_diff = req->rate - tmp_req.rate;
+ else
+ rate_diff = tmp_req.rate - req->rate;
if (!rate_diff || !req->best_parent_hw
|| best_rate_diff > rate_diff) {
req->best_parent_hw = parent;
- req->best_parent_rate = parent_rate;
+ req->best_parent_rate = tmp_req.best_parent_rate;
best_rate_diff = rate_diff;
- best_rate = tmp_rate;
+ best_rate = tmp_req.rate;
}
if (!rate_diff)
@@ -107,6 +138,9 @@ static int clk_composite_determine_rate(struct clk_hw *hw,
req->rate = best_rate;
return 0;
+ } else if (rate_hw && rate_ops && rate_ops->determine_rate) {
+ __clk_hw_set_clk(rate_hw, hw);
+ return rate_ops->determine_rate(rate_hw, req);
} else if (mux_hw && mux_ops && mux_ops->determine_rate) {
__clk_hw_set_clk(mux_hw, hw);
return mux_ops->determine_rate(mux_hw, req);
@@ -200,15 +234,16 @@ static void clk_composite_disable(struct clk_hw *hw)
gate_ops->disable(gate_hw);
}
-struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
- const char * const *parent_names, int num_parents,
+static struct clk_hw *__clk_hw_register_composite(struct device *dev,
+ const char *name, const char * const *parent_names,
+ const struct clk_parent_data *pdata, int num_parents,
struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
unsigned long flags)
{
struct clk_hw *hw;
- struct clk_init_data init;
+ struct clk_init_data init = {};
struct clk_composite *composite;
struct clk_ops *clk_composite_ops;
int ret;
@@ -218,8 +253,11 @@ struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
return ERR_PTR(-ENOMEM);
init.name = name;
- init.flags = flags | CLK_IS_BASIC;
- init.parent_names = parent_names;
+ init.flags = flags;
+ if (parent_names)
+ init.parent_names = parent_names;
+ else
+ init.parent_data = pdata;
init.num_parents = num_parents;
hw = &composite->hw;
@@ -313,6 +351,35 @@ err:
return hw;
}
+struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
+ const char * const *parent_names, int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ return __clk_hw_register_composite(dev, name, parent_names, NULL,
+ num_parents, mux_hw, mux_ops,
+ rate_hw, rate_ops, gate_hw,
+ gate_ops, flags);
+}
+EXPORT_SYMBOL_GPL(clk_hw_register_composite);
+
+struct clk_hw *clk_hw_register_composite_pdata(struct device *dev,
+ const char *name,
+ const struct clk_parent_data *parent_data,
+ int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ return __clk_hw_register_composite(dev, name, NULL, parent_data,
+ num_parents, mux_hw, mux_ops,
+ rate_hw, rate_ops, gate_hw,
+ gate_ops, flags);
+}
+
struct clk *clk_register_composite(struct device *dev, const char *name,
const char * const *parent_names, int num_parents,
struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
@@ -329,6 +396,25 @@ struct clk *clk_register_composite(struct device *dev, const char *name,
return ERR_CAST(hw);
return hw->clk;
}
+EXPORT_SYMBOL_GPL(clk_register_composite);
+
+struct clk *clk_register_composite_pdata(struct device *dev, const char *name,
+ const struct clk_parent_data *parent_data,
+ int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ struct clk_hw *hw;
+
+ hw = clk_hw_register_composite_pdata(dev, name, parent_data,
+ num_parents, mux_hw, mux_ops, rate_hw, rate_ops,
+ gate_hw, gate_ops, flags);
+ if (IS_ERR(hw))
+ return ERR_CAST(hw);
+ return hw->clk;
+}
void clk_unregister_composite(struct clk *clk)
{
@@ -344,3 +430,63 @@ void clk_unregister_composite(struct clk *clk)
clk_unregister(clk);
kfree(composite);
}
+
+void clk_hw_unregister_composite(struct clk_hw *hw)
+{
+ struct clk_composite *composite;
+
+ composite = to_clk_composite(hw);
+
+ clk_hw_unregister(hw);
+ kfree(composite);
+}
+EXPORT_SYMBOL_GPL(clk_hw_unregister_composite);
+
+static void devm_clk_hw_release_composite(struct device *dev, void *res)
+{
+ clk_hw_unregister_composite(*(struct clk_hw **)res);
+}
+
+static struct clk_hw *__devm_clk_hw_register_composite(struct device *dev,
+ const char *name, const char * const *parent_names,
+ const struct clk_parent_data *pdata, int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ struct clk_hw **ptr, *hw;
+
+ ptr = devres_alloc(devm_clk_hw_release_composite, sizeof(*ptr),
+ GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ hw = __clk_hw_register_composite(dev, name, parent_names, pdata,
+ num_parents, mux_hw, mux_ops, rate_hw,
+ rate_ops, gate_hw, gate_ops, flags);
+
+ if (!IS_ERR(hw)) {
+ *ptr = hw;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return hw;
+}
+
+struct clk_hw *devm_clk_hw_register_composite_pdata(struct device *dev,
+ const char *name,
+ const struct clk_parent_data *parent_data,
+ int num_parents,
+ struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
+ struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
+ struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
+ unsigned long flags)
+{
+ return __devm_clk_hw_register_composite(dev, name, NULL, parent_data,
+ num_parents, mux_hw, mux_ops,
+ rate_hw, rate_ops, gate_hw,
+ gate_ops, flags);
+}
generated by cgit (git 2.34.1) at 2025-12-24 22:28:16 +0000