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mfd: twl-core: API to set the regcache bypass for a given regmap in twl

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If the regcache is enabled on the regmap module drivers might need to access
to HW register(s) in certain cases in cache bypass mode.
As an example of this is the audio block's ANAMICL register. In normal
operation the content can be cached but during initialization one bit from
the register need to be monitored. With the twl_set_regcache_bypass() the
client driver can switch regcache bypass on and off when it is needed so
we can utilize the regcache for more registers.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Peter Ujfalusi 2014-01-03 15:27:47 +02:00 committed by Lee Jones
parent 8daf354065
commit 3def927ea8
2 changed files with 24 additions and 0 deletions
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21
drivers/mfd/twl-core.c
View File

@ -383,6 +383,27 @@ int twl_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
}
EXPORT_SYMBOL(twl_i2c_read);
/**
* twl_regcache_bypass - Configure the regcache bypass for the regmap associated
* with the module
* @mod_no: module number
* @enable: Regcache bypass state
*
* Returns 0 else failure.
*/
int twl_set_regcache_bypass(u8 mod_no, bool enable)
{
struct regmap *regmap = twl_get_regmap(mod_no);
if (!regmap)
return -EPERM;
regcache_cache_bypass(regmap, enable);
return 0;
}
EXPORT_SYMBOL(twl_set_regcache_bypass);
/*----------------------------------------------------------------------*/
/**

3
include/linux/i2c/twl.h
View File

@ -175,6 +175,9 @@ static inline int twl_class_is_ ##class(void) \
TWL_CLASS_IS(4030, TWL4030_CLASS_ID)
TWL_CLASS_IS(6030, TWL6030_CLASS_ID)
/* Set the regcache bypass for the regmap associated with the nodule */
int twl_set_regcache_bypass(u8 mod_no, bool enable);
/*
* Read and write several 8-bit registers at once.
*/