Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 613330a0 authored by Sascha Hauer's avatar Sascha Hauer Committed by Mark Brown
Browse files

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: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 6b21d18e

drivers/regulator/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

drivers/regulator/fixed-helper.c

0 → 100644
+53 −0
Original line number Diff line number Diff line 
#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;

}

include/linux/regulator/fixed.h

+13 −0
Original line number Diff line number Diff line
@@ -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