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authorDimitris Papastamos <dp@opensource.wolfsonmicro.com>2011-09-19 14:34:03 +0100
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-09-19 19:06:33 +0100
commit2cbbb579bcbe3e11baf1c59920dcd5a780b80447 (patch)
tree43fca4dcf12a9d2c4690977096d88c873bef9100 /include/linux/regmap.h
parent28644c809f44498b8cd91d00b4cdb09e63b99843 (diff)
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 'include/linux/regmap.h')
-rw-r--r--include/linux/regmap.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 63c4a5e126e9..cae69e637dff 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -25,6 +25,7 @@ enum regcache_type {
REGCACHE_NONE,
REGCACHE_INDEXED,
REGCACHE_RBTREE,
+ REGCACHE_LZO
};
/**