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Commit 5560f70c authored by Baolin Wang's avatar Baolin Wang Committed by Bjorn Andersson
Browse files

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: default avatarBaolin Wang <baolin.wang@linaro.org>
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
parent ce397d21

drivers/hwspinlock/hwspinlock_core.c

+29 −0
Original line number Diff line number Diff line
@@ -367,6 +367,35 @@ int of_hwspin_lock_get_id(struct device_node *np, int index) 
}

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;

include/linux/hwspinlock.h

+7 −0
Original line number Diff line number Diff line
@@ -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 */



/**