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hwspinlock/core: add device tree support

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This patch adds a new OF-friendly API of_hwspin_lock_get_id()
for hwspinlock clients to use/request locks from a hwspinlock
device instantiated through a device-tree blob. This new API
can be used by hwspinlock clients to get the id for a specific
lock using the phandle + args specifier, so that it can be
requested using the available hwspin_lock_request_specific()
API.

Signed-off-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
[small comment clarification]
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
This commit is contained in:
Suman Anna 2015-03-04 20:01:14 -06:00 • committed by Ohad Ben-Cohen
parent 0ce8cf2f31
commit fb7737e949
3 changed files with 96 additions and 0 deletions
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7
include/linux/hwspinlock.h
View file

@ -26,6 +26,7 @@
#define HWLOCK_IRQ 0x02 /* Disable interrupts, don't save state */
struct device;
struct device_node;
struct hwspinlock;
struct hwspinlock_device;
struct hwspinlock_ops;
@ -66,6 +67,7 @@ int hwspin_lock_unregister(struct hwspinlock_device *bank);
struct hwspinlock *hwspin_lock_request(void);
struct hwspinlock *hwspin_lock_request_specific(unsigned int id);
int hwspin_lock_free(struct hwspinlock *hwlock);
int of_hwspin_lock_get_id(struct device_node *np, int index);
int hwspin_lock_get_id(struct hwspinlock *hwlock);
int __hwspin_lock_timeout(struct hwspinlock *, unsigned int, int,
unsigned long *);
@ -120,6 +122,11 @@ void __hwspin_unlock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
{
}
static inline int of_hwspin_lock_get_id(struct device_node *np, int index)
{
return 0;
}
static inline int hwspin_lock_get_id(struct hwspinlock *hwlock)
{
return 0;