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| author | Dimitris Papastamos <dp@opensource.wolfsonmicro.com> | 2011-09-19 15:34:03 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-09-19 20:06:33 +0200 |
| commit | 2cbbb579bcbe3e11baf1c59920dcd5a780b80447 (patch) | |
| tree | 43fca4dcf12a9d2c4690977096d88c873bef9100 /drivers/base/regmap/internal.h | |
| parent | regmap: Add the rbtree cache support (diff) | |
| download | linux-2cbbb579bcbe3e11baf1c59920dcd5a780b80447.tar.xz linux-2cbbb579bcbe3e11baf1c59920dcd5a780b80447.zip | |
regmap: Add the LZO cache support
This patch adds support for LZO compression when storing the register
cache.
For a typical device whose register map would normally occupy 25kB or 50kB
by using the LZO compression technique, one can get down to ~5-7kB. There
might be a performance penalty associated with each individual read/write
due to decompressing/compressing the underlying cache, however that should not
be noticeable. These memory benefits depend on whether the target architecture
can get rid of the memory occupied by the original register defaults cache
which is marked as __devinitconst. Nevertheless there will be some memory
gain even if the target architecture can't get rid of the original register
map, this should be around ~30-32kB instead of 50kB.
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/base/regmap/internal.h')
| -rw-r--r-- | drivers/base/regmap/internal.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h index 7ef8afc77e7c..2d51b1b099f7 100644 --- a/drivers/base/regmap/internal.h +++ b/drivers/base/regmap/internal.h @@ -120,4 +120,6 @@ int regcache_insert_reg(struct regmap *map, unsigned int reg, extern struct regcache_ops regcache_indexed_ops; extern struct regcache_ops regcache_rbtree_ops; +extern struct regcache_ops regcache_lzo_ops; + #endif |