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authorSuman Anna <s-anna@ti.com>2015-03-05 03:01:14 +0100
committerOhad Ben-Cohen <ohad@wizery.com>2015-05-02 08:54:30 +0200
commitfb7737e949e31d8a71acee6bbb670f32dbd2a2c0 (patch)
tree57ba40cfa05ca8a34211f3cbd97f77625beeed0a /Documentation
parentDocumentation: dt: add common bindings for hwspinlock (diff)
downloadlinux-fb7737e949e31d8a71acee6bbb670f32dbd2a2c0.tar.xz
linux-fb7737e949e31d8a71acee6bbb670f32dbd2a2c0.zip
hwspinlock/core: add device tree support
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/hwspinlock.txt10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/hwspinlock.txt b/Documentation/hwspinlock.txt
index 62f7d4ea6e26..61c1ee98e59f 100644
--- a/Documentation/hwspinlock.txt
+++ b/Documentation/hwspinlock.txt
@@ -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