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-rw-r--r--Documentation/driver-model/devres.txt4
-rw-r--r--drivers/clk/clkdev.c142
-rw-r--r--include/linux/clk.h32
-rw-r--r--include/linux/clkdev.h3
4 files changed, 171 insertions, 10 deletions
diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index 2a596a4fc23e..9faac6ae3525 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -276,3 +276,7 @@ REGULATOR
devm_regulator_get()
devm_regulator_put()
devm_regulator_bulk_get()
+
+CLOCK
+ devm_clk_get()
+ devm_clk_put()
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 6db161f64ae0..c535cf8c5770 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -35,7 +35,12 @@ static DEFINE_MUTEX(clocks_mutex);
static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
{
struct clk_lookup *p, *cl = NULL;
- int match, best = 0;
+ int match, best_found = 0, best_possible = 0;
+
+ if (dev_id)
+ best_possible += 2;
+ if (con_id)
+ best_possible += 1;
list_for_each_entry(p, &clocks, node) {
match = 0;
@@ -50,10 +55,10 @@ static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
match += 1;
}
- if (match > best) {
+ if (match > best_found) {
cl = p;
- if (match != 3)
- best = match;
+ if (match != best_possible)
+ best_found = match;
else
break;
}
@@ -89,6 +94,51 @@ void clk_put(struct clk *clk)
}
EXPORT_SYMBOL(clk_put);
+static void devm_clk_release(struct device *dev, void *res)
+{
+ clk_put(*(struct clk **)res);
+}
+
+struct clk *devm_clk_get(struct device *dev, const char *id)
+{
+ struct clk **ptr, *clk;
+
+ ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ clk = clk_get(dev, id);
+ if (!IS_ERR(clk)) {
+ *ptr = clk;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return clk;
+}
+EXPORT_SYMBOL(devm_clk_get);
+
+static int devm_clk_match(struct device *dev, void *res, void *data)
+{
+ struct clk **c = res;
+ if (!c || !*c) {
+ WARN_ON(!c || !*c);
+ return 0;
+ }
+ return *c == data;
+}
+
+void devm_clk_put(struct device *dev, struct clk *clk)
+{
+ int ret;
+
+ ret = devres_destroy(dev, devm_clk_release, devm_clk_match, clk);
+
+ WARN_ON(ret);
+}
+EXPORT_SYMBOL(devm_clk_put);
+
void clkdev_add(struct clk_lookup *cl)
{
mutex_lock(&clocks_mutex);
@@ -116,8 +166,9 @@ struct clk_lookup_alloc {
char con_id[MAX_CON_ID];
};
-struct clk_lookup * __init_refok
-clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
+static struct clk_lookup * __init_refok
+vclkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt,
+ va_list ap)
{
struct clk_lookup_alloc *cla;
@@ -132,16 +183,25 @@ clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
}
if (dev_fmt) {
- va_list ap;
-
- va_start(ap, dev_fmt);
vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
cla->cl.dev_id = cla->dev_id;
- va_end(ap);
}
return &cla->cl;
}
+
+struct clk_lookup * __init_refok
+clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
+{
+ struct clk_lookup *cl;
+ va_list ap;
+
+ va_start(ap, dev_fmt);
+ cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
+ va_end(ap);
+
+ return cl;
+}
EXPORT_SYMBOL(clkdev_alloc);
int clk_add_alias(const char *alias, const char *alias_dev_name, char *id,
@@ -173,3 +233,65 @@ void clkdev_drop(struct clk_lookup *cl)
kfree(cl);
}
EXPORT_SYMBOL(clkdev_drop);
+
+/**
+ * clk_register_clkdev - register one clock lookup for a struct clk
+ * @clk: struct clk to associate with all clk_lookups
+ * @con_id: connection ID string on device
+ * @dev_id: format string describing device name
+ *
+ * con_id or dev_id may be NULL as a wildcard, just as in the rest of
+ * clkdev.
+ *
+ * To make things easier for mass registration, we detect error clks
+ * from a previous clk_register() call, and return the error code for
+ * those. This is to permit this function to be called immediately
+ * after clk_register().
+ */
+int clk_register_clkdev(struct clk *clk, const char *con_id,
+ const char *dev_fmt, ...)
+{
+ struct clk_lookup *cl;
+ va_list ap;
+
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ va_start(ap, dev_fmt);
+ cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
+ va_end(ap);
+
+ if (!cl)
+ return -ENOMEM;
+
+ clkdev_add(cl);
+
+ return 0;
+}
+
+/**
+ * clk_register_clkdevs - register a set of clk_lookup for a struct clk
+ * @clk: struct clk to associate with all clk_lookups
+ * @cl: array of clk_lookup structures with con_id and dev_id pre-initialized
+ * @num: number of clk_lookup structures to register
+ *
+ * To make things easier for mass registration, we detect error clks
+ * from a previous clk_register() call, and return the error code for
+ * those. This is to permit this function to be called immediately
+ * after clk_register().
+ */
+int clk_register_clkdevs(struct clk *clk, struct clk_lookup *cl, size_t num)
+{
+ unsigned i;
+
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ for (i = 0; i < num; i++, cl++) {
+ cl->clk = clk;
+ clkdev_add(cl);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(clk_register_clkdevs);
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 0e078bdec09f..ad5c43e8ae8a 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -101,6 +101,26 @@ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb);
struct clk *clk_get(struct device *dev, const char *id);
/**
+ * devm_clk_get - lookup and obtain a managed reference to a clock producer.
+ * @dev: device for clock "consumer"
+ * @id: clock comsumer ID
+ *
+ * Returns a struct clk corresponding to the clock producer, or
+ * valid IS_ERR() condition containing errno. The implementation
+ * uses @dev and @id to determine the clock consumer, and thereby
+ * the clock producer. (IOW, @id may be identical strings, but
+ * clk_get may return different clock producers depending on @dev.)
+ *
+ * Drivers must assume that the clock source is not enabled.
+ *
+ * devm_clk_get should not be called from within interrupt context.
+ *
+ * The clock will automatically be freed when the device is unbound
+ * from the bus.
+ */
+struct clk *devm_clk_get(struct device *dev, const char *id);
+
+/**
* clk_prepare - prepare a clock source
* @clk: clock source
*
@@ -206,6 +226,18 @@ unsigned long clk_get_rate(struct clk *clk);
*/
void clk_put(struct clk *clk);
+/**
+ * devm_clk_put - "free" a managed clock source
+ * @dev: device used to acuqire the clock
+ * @clk: clock source acquired with devm_clk_get()
+ *
+ * Note: drivers must ensure that all clk_enable calls made on this
+ * clock source are balanced by clk_disable calls prior to calling
+ * this function.
+ *
+ * clk_put should not be called from within interrupt context.
+ */
+void devm_clk_put(struct device *dev, struct clk *clk);
/*
* The remaining APIs are optional for machine class support.
diff --git a/include/linux/clkdev.h b/include/linux/clkdev.h
index d9a4fd028c9d..a6a6f603103b 100644
--- a/include/linux/clkdev.h
+++ b/include/linux/clkdev.h
@@ -40,4 +40,7 @@ void clkdev_drop(struct clk_lookup *cl);
void clkdev_add_table(struct clk_lookup *, size_t);
int clk_add_alias(const char *, const char *, char *, struct device *);
+int clk_register_clkdev(struct clk *, const char *, const char *, ...);
+int clk_register_clkdevs(struct clk *, struct clk_lookup *, size_t);
+
#endif