2cbbb579bc
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>
15 lines
364 B
Text
15 lines
364 B
Text
# Generic register map support. There are no user servicable options here,
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# this is an API intended to be used by other kernel subsystems. These
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# subsystems should select the appropriate symbols.
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config REGMAP
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default y if (REGMAP_I2C || REGMAP_SPI)
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select LZO_COMPRESS
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select LZO_DECOMPRESS
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bool
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config REGMAP_I2C
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tristate
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config REGMAP_SPI
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tristate
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