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regulator: provide a helper for registering a fixed regulator 

Some devices require a regulator to work, but boards may not have
a software controllable regulator for this device. Provide a helper
function to make it simpler for these boards to register a fixed
regulator as a dummy regulator.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Sascha Hauer 2012-03-03 12:40:02 +01:00 committed by Mark Brown
parent 6b21d18ed5
commit 613330a0f7
3 changed files with 67 additions and 1 deletions
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2
drivers/regulator/Makefile
View File

@ -3,7 +3,7 @@
#
obj-$(CONFIG_REGULATOR) += core.o dummy.o
obj-$(CONFIG_REGULATOR) += core.o dummy.o fixed-helper.o
obj-$(CONFIG_OF) += of_regulator.o
obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o
obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o

53
drivers/regulator/fixed-helper.c Normal file
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@ -0,0 +1,53 @@
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/fixed.h>
struct fixed_regulator_data {
struct fixed_voltage_config cfg;
struct regulator_init_data init_data;
struct platform_device pdev;
};
static void regulator_fixed_release(struct device *dev)
{
struct fixed_regulator_data *data = container_of(dev,
struct fixed_regulator_data, pdev.dev);
kfree(data);
}
/**
* regulator_register_fixed - register a no-op fixed regulator
* @name: supply name
* @id: platform device id
* @supplies: consumers for this regulator
* @num_supplies: number of consumers
*/
struct platform_device *regulator_register_fixed(int id,
struct regulator_consumer_supply *supplies, int num_supplies)
{
struct fixed_regulator_data *data;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return NULL;
data->cfg.supply_name = "dummy";
data->cfg.microvolts = 0;
data->cfg.gpio = -EINVAL;
data->cfg.enabled_at_boot = 1;
data->cfg.init_data = &data->init_data;
data->init_data.constraints.always_on = 1;
data->init_data.consumer_supplies = supplies;
data->init_data.num_consumer_supplies = num_supplies;
data->pdev.name = "reg-fixed-voltage";
data->pdev.id = id;
data->pdev.dev.platform_data = &data->cfg;
data->pdev.dev.release = regulator_fixed_release;
platform_device_register(&data->pdev);
return &data->pdev;
}

13
include/linux/regulator/fixed.h
View File

@ -48,4 +48,17 @@ struct fixed_voltage_config {
struct regulator_init_data *init_data;
};
struct regulator_consumer_supply;
#if IS_ENABLED(CONFIG_REGULATOR)
struct platform_device *regulator_register_fixed(int id,
struct regulator_consumer_supply *supplies, int num_supplies);
#else
static inline struct platform_device *regulator_register_fixed(int id,
struct regulator_consumer_supply *supplies, int num_supplies)
{
return NULL;
}
#endif
#endif