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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 <[email protected]>
Reviewed-by: Bjorn Andersson <[email protected]>
[small comment clarification]
Signed-off-by: Ohad Ben-Cohen <[email protected]>
This commit is contained in:
Suman Anna 2015-03-04 20:01:14 -06:00 • committed by Ohad Ben-Cohen
commit fb7737e949
3 changed files with 96 additions and 0 deletions
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10
Documentation/hwspinlock.txt
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@ -48,6 +48,16 @@ independent, drivers.
ids for predefined purposes.
Should be called from a process context (might sleep).
int of_hwspin_lock_get_id(struct device_node *np, int index);
- retrieve the global lock id for an OF phandle-based specific lock.
This function provides a means for DT users of a hwspinlock module
to get the global lock id of a specific hwspinlock, so that it can
be requested using the normal hwspin_lock_request_specific() API.
The function returns a lock id number on success, -EPROBE_DEFER if
the hwspinlock device is not yet registered with the core, or other
error values.
Should be called from a process context (might sleep).
int hwspin_lock_free(struct hwspinlock *hwlock);
- free a previously-assigned hwspinlock; returns 0 on success, or an
appropriate error code on failure (e.g. -EINVAL if the hwspinlock