From 613330a0f73b2698b2210ea89092eb56635fc5d8 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Sat, 3 Mar 2012 12:40:02 +0100 Subject: 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 Signed-off-by: Mark Brown --- drivers/regulator/Makefile | 2 +- drivers/regulator/fixed-helper.c | 53 ++++++++++++++++++++++++++++++++++++++++ include/linux/regulator/fixed.h | 13 ++++++++++ 3 files changed, 67 insertions(+), 1 deletion(-) create mode 100644 drivers/regulator/fixed-helper.c diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 503bac87715e..f76deb912d5a 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -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 diff --git a/drivers/regulator/fixed-helper.c b/drivers/regulator/fixed-helper.c new file mode 100644 index 000000000000..30d0a15b8949 --- /dev/null +++ b/drivers/regulator/fixed-helper.c @@ -0,0 +1,53 @@ +#include +#include +#include +#include + +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; +} diff --git a/include/linux/regulator/fixed.h b/include/linux/regulator/fixed.h index ffd7d508e726..936a7d8c11a9 100644 --- a/include/linux/regulator/fixed.h +++ b/include/linux/regulator/fixed.h @@ -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 -- cgit v1.2.3