Merge branch 'depends/rmk/clkdev' into next/clock

* depends/rmk/clkdev:
  CLKDEV: provide helpers for common clock framework
  ARM: 7392/1: CLKDEV: Optimize clk_find()
  ARM: 7376/1: clkdev: Implement managed clk_get()
This commit is contained in:
Arnd Bergmann 2012-05-11 17:13:00 +02:00
commit e12ff34402
4 changed files with 171 additions and 10 deletions

View File

@ -276,3 +276,7 @@ REGULATOR
devm_regulator_get()
devm_regulator_put()
devm_regulator_bulk_get()
CLOCK
devm_clk_get()
devm_clk_put()

View File

@ -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);

View File

@ -100,6 +100,26 @@ 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.

View File

@ -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