@@ -375,6 +375,35 @@ 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;
@@ -74,6 +74,7 @@ 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 */
@@ -133,6 +134,12 @@ 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 */
/**
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> --- drivers/hwspinlock/hwspinlock_core.c | 29 +++++++++++++++++++++++++++++ include/linux/hwspinlock.h | 7 +++++++ 2 files changed, 36 insertions(+)