diff options
| author | Stephen Warren <swarren@nvidia.com> | 2012-04-04 23:48:28 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-04-13 12:29:16 +0200 |
| commit | a42678c4c8b5f6d489829ffc3071fa1f08ee99d1 (patch) | |
| tree | 94d3445cc6e269686d759f319b9bc38a316bb7e4 /include | |
| parent | regmap: introduce explicit bus_context for bus callbacks (diff) | |
| download | linux-a42678c4c8b5f6d489829ffc3071fa1f08ee99d1.tar.xz linux-a42678c4c8b5f6d489829ffc3071fa1f08ee99d1.zip | |
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>
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 8fd341e613d6..f14588a96eaf 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -110,6 +110,8 @@ 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. @@ -119,6 +121,7 @@ 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; |