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hwspinlock: Add one new API to support getting a specific hwlock by the name 

The hardware spinlock binding already supplied the 'hwlock-names' property
to match and get a specific hwlock, but did not supply one API for users
to get a specific hwlock by the hwlock name. So this patch introduces one
API to support this requirement.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
hifive-unleashed-5.1
Baolin Wang 2018-06-22 16:08:58 +08:00 committed by Bjorn Andersson
parent ce397d215c
commit 5560f70cad
2 changed files with 36 additions and 0 deletions
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29
drivers/hwspinlock/hwspinlock_core.c
View File

@ -367,6 +367,35 @@ out:
}
EXPORT_SYMBOL_GPL(of_hwspin_lock_get_id);
/**
* of_hwspin_lock_get_id_byname() - get lock id for an specified hwlock name
* @np: device node from which to request the specific hwlock
* @name: hwlock name
*
* This function provides a means for DT users of the hwspinlock module to
* get the global lock id of a specific hwspinlock using the specified name of
* the hwspinlock device, so that it can be requested using the normal
* hwspin_lock_request_specific() API.
*
* Returns the global lock id number on success, -EPROBE_DEFER if the hwspinlock
* device is not yet registered, -EINVAL on invalid args specifier value or an
* appropriate error as returned from the OF parsing of the DT client node.
*/
int of_hwspin_lock_get_id_byname(struct device_node *np, const char *name)
{
int index;
if (!name)
return -EINVAL;
index = of_property_match_string(np, "hwlock-names", name);
if (index < 0)
return index;
return of_hwspin_lock_get_id(np, index);
}
EXPORT_SYMBOL_GPL(of_hwspin_lock_get_id_byname);
static int hwspin_lock_register_single(struct hwspinlock *hwlock, int id)
{
struct hwspinlock *tmp;

7
include/linux/hwspinlock.h
View File

@ -66,6 +66,7 @@ int __hwspin_lock_timeout(struct hwspinlock *, unsigned int, int,
unsigned long *);
int __hwspin_trylock(struct hwspinlock *, int, unsigned long *);
void __hwspin_unlock(struct hwspinlock *, int, unsigned long *);
int of_hwspin_lock_get_id_byname(struct device_node *np, const char *name);
#else /* !CONFIG_HWSPINLOCK */
@ -125,6 +126,12 @@ static inline int hwspin_lock_get_id(struct hwspinlock *hwlock)
return 0;
}
static inline
int of_hwspin_lock_get_id_byname(struct device_node *np, const char *name)
{
return 0;
}
#endif /* !CONFIG_HWSPINLOCK */
/**