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authorSascha Hauer <s.hauer@pengutronix.de>2012-03-03 12:40:02 +0100
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-03-03 16:32:47 +0000
commit613330a0f73b2698b2210ea89092eb56635fc5d8 (patch)
tree1f7c5c94bc5c9e28ef54e29c310ae276499ba5e3
parent6b21d18ed50c7d145220b0724ea7f2613abf0f95 (diff)
downloadlinux-613330a0f73b2698b2210ea89092eb56635fc5d8.tar.bz2
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>
-rw-r--r--drivers/regulator/Makefile2
-rw-r--r--drivers/regulator/fixed-helper.c53
-rw-r--r--include/linux/regulator/fixed.h13
3 files changed, 67 insertions, 1 deletions
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 <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;
+}
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