linux/drivers/base/regmap/Kconfig
Dimitris Papastamos 2cbbb579bc 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>
2011-09-19 19:06:33 +01:00

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# Generic register map support. There are no user servicable options here,
# this is an API intended to be used by other kernel subsystems. These
# subsystems should select the appropriate symbols.
config REGMAP
default y if (REGMAP_I2C || REGMAP_SPI)
select LZO_COMPRESS
select LZO_DECOMPRESS
bool
config REGMAP_I2C
tristate
config REGMAP_SPI
tristate