diff options
| author | Stephen Warren <swarren@nvidia.com> | 2012-04-04 15:48:28 -0600 |
|---|---|---|
| committer | Simone Willett <swillett@nvidia.com> | 2012-04-15 14:18:17 -0700 |
| commit | 77a38d8012fd6603e25eb3aa7a012856ab0a6ae8 (patch) | |
| tree | ab042f988b2955ce947e758b158aa060aeda0ba1 /include | |
| parent | d5a70b9a3304ef71b0a0ba97a9933c579b1fa6b0 (diff) | |
regmap: introduce fast_io busses, and use a spinlock for them
Some bus types have very fast IO. For these, acquiring a mutex for every
IO operation is a significant overhead. Allow busses to indicate their IO
is fast, and enhance regmap to use a spinlock for those busses.
[Currently limited to native endian registers -- broonie]
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
(cherry picked from commit bacdbe077342ecc9e7b3e374cc5a41995116706a)
Change-Id: I337f27a09f2b176b46e8f6d05401957a1abc0609
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/96503
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/regmap.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/regmap.h b/include/linux/regmap.h index e3ed73658e12..5c2058126f48 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -107,6 +107,8 @@ typedef void (*regmap_hw_free_context)(void *context); /** * Description of a hardware bus for the register map infrastructure. * + * @fast_io: Register IO is fast. Use a spinlock instead of a mutex + * to perform locking. * @write: Write operation. * @gather_write: Write operation with split register/value, return -ENOTSUPP * if not implemented on a given device. @@ -116,6 +118,7 @@ typedef void (*regmap_hw_free_context)(void *context); * a read. */ struct regmap_bus { + bool fast_io; regmap_hw_write write; regmap_hw_gather_write gather_write; regmap_hw_read read; |