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path: root/drivers/clk/clkdev.c
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Diffstat (limited to 'drivers/clk/clkdev.c')
-rw-r--r--drivers/clk/clkdev.c110
1 files changed, 76 insertions, 34 deletions
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index da4bda8b7fc7..043fd3633373 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -19,6 +19,7 @@
#include <linux/mutex.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
#include <linux/of.h>
#include "clk.h"
@@ -28,6 +29,20 @@ static DEFINE_MUTEX(clocks_mutex);
#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
+static struct clk *__of_clk_get_by_clkspec(struct of_phandle_args *clkspec,
+ const char *dev_id, const char *con_id)
+{
+ struct clk *clk;
+
+ if (!clkspec)
+ return ERR_PTR(-EINVAL);
+
+ of_clk_lock();
+ clk = __of_clk_get_from_provider(clkspec, dev_id, con_id);
+ of_clk_unlock();
+ return clk;
+}
+
/**
* of_clk_get_by_clkspec() - Lookup a clock form a clock provider
* @clkspec: pointer to a clock specifier data structure
@@ -38,22 +53,11 @@ static DEFINE_MUTEX(clocks_mutex);
*/
struct clk *of_clk_get_by_clkspec(struct of_phandle_args *clkspec)
{
- struct clk *clk;
-
- if (!clkspec)
- return ERR_PTR(-EINVAL);
-
- of_clk_lock();
- clk = __of_clk_get_from_provider(clkspec);
-
- if (!IS_ERR(clk) && !__clk_get(clk))
- clk = ERR_PTR(-ENOENT);
-
- of_clk_unlock();
- return clk;
+ return __of_clk_get_by_clkspec(clkspec, NULL, __func__);
}
-struct clk *of_clk_get(struct device_node *np, int index)
+static struct clk *__of_clk_get(struct device_node *np, int index,
+ const char *dev_id, const char *con_id)
{
struct of_phandle_args clkspec;
struct clk *clk;
@@ -67,22 +71,21 @@ struct clk *of_clk_get(struct device_node *np, int index)
if (rc)
return ERR_PTR(rc);
- clk = of_clk_get_by_clkspec(&clkspec);
+ clk = __of_clk_get_by_clkspec(&clkspec, dev_id, con_id);
of_node_put(clkspec.np);
+
return clk;
}
+
+struct clk *of_clk_get(struct device_node *np, int index)
+{
+ return __of_clk_get(np, index, np->full_name, NULL);
+}
EXPORT_SYMBOL(of_clk_get);
-/**
- * of_clk_get_by_name() - Parse and lookup a clock referenced by a device node
- * @np: pointer to clock consumer node
- * @name: name of consumer's clock input, or NULL for the first clock reference
- *
- * This function parses the clocks and clock-names properties,
- * and uses them to look up the struct clk from the registered list of clock
- * providers.
- */
-struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
+static struct clk *__of_clk_get_by_name(struct device_node *np,
+ const char *dev_id,
+ const char *name)
{
struct clk *clk = ERR_PTR(-ENOENT);
@@ -97,10 +100,10 @@ struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
*/
if (name)
index = of_property_match_string(np, "clock-names", name);
- clk = of_clk_get(np, index);
- if (!IS_ERR(clk))
+ clk = __of_clk_get(np, index, dev_id, name);
+ if (!IS_ERR(clk)) {
break;
- else if (name && index >= 0) {
+ } else if (name && index >= 0) {
if (PTR_ERR(clk) != -EPROBE_DEFER)
pr_err("ERROR: could not get clock %s:%s(%i)\n",
np->full_name, name ? name : "", index);
@@ -119,7 +122,33 @@ struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
return clk;
}
+
+/**
+ * of_clk_get_by_name() - Parse and lookup a clock referenced by a device node
+ * @np: pointer to clock consumer node
+ * @name: name of consumer's clock input, or NULL for the first clock reference
+ *
+ * This function parses the clocks and clock-names properties,
+ * and uses them to look up the struct clk from the registered list of clock
+ * providers.
+ */
+struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
+{
+ if (!np)
+ return ERR_PTR(-ENOENT);
+
+ return __of_clk_get_by_name(np, np->full_name, name);
+}
EXPORT_SYMBOL(of_clk_get_by_name);
+
+#else /* defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) */
+
+static struct clk *__of_clk_get_by_name(struct device_node *np,
+ const char *dev_id,
+ const char *name)
+{
+ return ERR_PTR(-ENOENT);
+}
#endif
/*
@@ -168,14 +197,28 @@ static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
struct clk *clk_get_sys(const char *dev_id, const char *con_id)
{
struct clk_lookup *cl;
+ struct clk *clk = NULL;
mutex_lock(&clocks_mutex);
+
cl = clk_find(dev_id, con_id);
- if (cl && !__clk_get(cl->clk))
+ if (!cl)
+ goto out;
+
+ clk = __clk_create_clk(__clk_get_hw(cl->clk), dev_id, con_id);
+ if (IS_ERR(clk))
+ goto out;
+
+ if (!__clk_get(clk)) {
+ __clk_free_clk(clk);
cl = NULL;
+ goto out;
+ }
+
+out:
mutex_unlock(&clocks_mutex);
- return cl ? cl->clk : ERR_PTR(-ENOENT);
+ return cl ? clk : ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(clk_get_sys);
@@ -185,10 +228,8 @@ struct clk *clk_get(struct device *dev, const char *con_id)
struct clk *clk;
if (dev) {
- clk = of_clk_get_by_name(dev->of_node, con_id);
- if (!IS_ERR(clk))
- return clk;
- if (PTR_ERR(clk) == -EPROBE_DEFER)
+ clk = __of_clk_get_by_name(dev->of_node, dev_id, con_id);
+ if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
return clk;
}
@@ -331,6 +372,7 @@ int clk_register_clkdev(struct clk *clk, const char *con_id,
return 0;
}
+EXPORT_SYMBOL(clk_register_clkdev);
/**
* clk_register_clkdevs - register a set of clk_lookup for a struct clk