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regulator: core: Provide standard enable operations for regmap users

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Since the enable(), disable() and is_enabled() operations for most regmap
based regulators come down to reading and updating a single register bit
we can factor out the code and allow these drivers to just define which
bit to update using the enable_reg and enable_mask fields in their desc
and then use operations provided by the core.

As well as the code saving this opens the door to future optimisation of
the bulk operations - if the core can realise that we are updating a
single register for multiple regulators then it should be able to combine
these updates into a single physical operation.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
This commit is contained in:
Mark Brown 2012-04-15 12:37:47 +01:00
parent 633b6fcd5a
commit cd6dffb4c6
2 changed files with 62 additions and 0 deletions
drivers/regulator
core.c
include/linux/regulator
driver.h

55
drivers/regulator/core.c
View file

@ -1725,6 +1725,61 @@ int regulator_disable_deferred(struct regulator *regulator, int ms)
}
EXPORT_SYMBOL_GPL(regulator_disable_deferred);
/**
* regulator_is_enabled_regmap - standard is_enabled() for regmap users
*
* @rdev: regulator to operate on
*
* Regulators that use regmap for their register I/O can set the
* enable_reg and enable_mask fields in their descriptor and then use
* this as their is_enabled operation, saving some code.
*/
int regulator_is_enabled_regmap(struct regulator_dev *rdev)
{
unsigned int val;
int ret;
ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
if (ret != 0)
return ret;
return (val & rdev->desc->enable_mask) != 0;
}
EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
/**
* regulator_enable_regmap - standard enable() for regmap users
*
* @rdev: regulator to operate on
*
* Regulators that use regmap for their register I/O can set the
* enable_reg and enable_mask fields in their descriptor and then use
* this as their enable() operation, saving some code.
*/
int regulator_enable_regmap(struct regulator_dev *rdev)
{
return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask,
rdev->desc->enable_mask);
}
EXPORT_SYMBOL_GPL(regulator_enable_regmap);
/**
* regulator_disable_regmap - standard disable() for regmap users
*
* @rdev: regulator to operate on
*
* Regulators that use regmap for their register I/O can set the
* enable_reg and enable_mask fields in their descriptor and then use
* this as their disable() operation, saving some code.
*/
int regulator_disable_regmap(struct regulator_dev *rdev)
{
return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask, 0);
}
EXPORT_SYMBOL_GPL(regulator_disable_regmap);
static int _regulator_is_enabled(struct regulator_dev *rdev)
{
/* If we don't know then assume that the regulator is always on */

7
include/linux/regulator/driver.h
View file

@ -167,6 +167,8 @@ enum regulator_type {
* @vsel_reg: Register for selector when using regulator_regmap_X_voltage_
* @vsel_mask: Mask for register bitfield used for selector
* @enable_reg: Register for control when using regmap enable/disable ops
* @enable_mask: Mask for control when using regmap enable/disable ops
*/
struct regulator_desc {
const char *name;
@ -180,6 +182,8 @@ struct regulator_desc {
unsigned int vsel_reg;
unsigned int vsel_mask;
unsigned int enable_reg;
unsigned int enable_mask;
};
/**
@ -258,6 +262,9 @@ int regulator_mode_to_status(unsigned int);
int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev);
int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel);
int regulator_is_enabled_regmap(struct regulator_dev *rdev);
int regulator_enable_regmap(struct regulator_dev *rdev);
int regulator_disable_regmap(struct regulator_dev *rdev);
void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);