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path: root/drivers/regulator/core.c
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Diffstat (limited to 'drivers/regulator/core.c')
-rw-r--r--drivers/regulator/core.c57
1 files changed, 48 insertions, 9 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index cc8b337b911..f1d10c974cd 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -33,6 +33,7 @@ static DEFINE_MUTEX(regulator_list_mutex);
static LIST_HEAD(regulator_list);
static LIST_HEAD(regulator_map_list);
static int has_full_constraints;
+static bool board_wants_dummy_regulator;
/*
* struct regulator_map
@@ -63,7 +64,8 @@ struct regulator {
};
static int _regulator_is_enabled(struct regulator_dev *rdev);
-static int _regulator_disable(struct regulator_dev *rdev);
+static int _regulator_disable(struct regulator_dev *rdev,
+ struct regulator_dev **supply_rdev_ptr);
static int _regulator_get_voltage(struct regulator_dev *rdev);
static int _regulator_get_current_limit(struct regulator_dev *rdev);
static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
@@ -1108,6 +1110,11 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
}
}
+ if (board_wants_dummy_regulator) {
+ rdev = dummy_regulator_rdev;
+ goto found;
+ }
+
#ifdef CONFIG_REGULATOR_DUMMY
if (!devname)
devname = "deviceless";
@@ -1348,7 +1355,8 @@ int regulator_enable(struct regulator *regulator)
EXPORT_SYMBOL_GPL(regulator_enable);
/* locks held by regulator_disable() */
-static int _regulator_disable(struct regulator_dev *rdev)
+static int _regulator_disable(struct regulator_dev *rdev,
+ struct regulator_dev **supply_rdev_ptr)
{
int ret = 0;
@@ -1376,8 +1384,7 @@ static int _regulator_disable(struct regulator_dev *rdev)
}
/* decrease our supplies ref count and disable if required */
- if (rdev->supply)
- _regulator_disable(rdev->supply);
+ *supply_rdev_ptr = rdev->supply;
rdev->use_count = 0;
} else if (rdev->use_count > 1) {
@@ -1407,17 +1414,29 @@ static int _regulator_disable(struct regulator_dev *rdev)
int regulator_disable(struct regulator *regulator)
{
struct regulator_dev *rdev = regulator->rdev;
+ struct regulator_dev *supply_rdev = NULL;
int ret = 0;
mutex_lock(&rdev->mutex);
- ret = _regulator_disable(rdev);
+ ret = _regulator_disable(rdev, &supply_rdev);
mutex_unlock(&rdev->mutex);
+
+ /* decrease our supplies ref count and disable if required */
+ while (supply_rdev != NULL) {
+ rdev = supply_rdev;
+
+ mutex_lock(&rdev->mutex);
+ _regulator_disable(rdev, &supply_rdev);
+ mutex_unlock(&rdev->mutex);
+ }
+
return ret;
}
EXPORT_SYMBOL_GPL(regulator_disable);
/* locks held by regulator_force_disable() */
-static int _regulator_force_disable(struct regulator_dev *rdev)
+static int _regulator_force_disable(struct regulator_dev *rdev,
+ struct regulator_dev **supply_rdev_ptr)
{
int ret = 0;
@@ -1436,8 +1455,7 @@ static int _regulator_force_disable(struct regulator_dev *rdev)
}
/* decrease our supplies ref count and disable if required */
- if (rdev->supply)
- _regulator_disable(rdev->supply);
+ *supply_rdev_ptr = rdev->supply;
rdev->use_count = 0;
return ret;
@@ -1454,12 +1472,17 @@ static int _regulator_force_disable(struct regulator_dev *rdev)
*/
int regulator_force_disable(struct regulator *regulator)
{
+ struct regulator_dev *supply_rdev = NULL;
int ret;
mutex_lock(&regulator->rdev->mutex);
regulator->uA_load = 0;
- ret = _regulator_force_disable(regulator->rdev);
+ ret = _regulator_force_disable(regulator->rdev, &supply_rdev);
mutex_unlock(&regulator->rdev->mutex);
+
+ if (supply_rdev)
+ regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev)));
+
return ret;
}
EXPORT_SYMBOL_GPL(regulator_force_disable);
@@ -2463,6 +2486,22 @@ void regulator_has_full_constraints(void)
EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
/**
+ * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
+ *
+ * Calling this function will cause the regulator API to provide a
+ * dummy regulator to consumers if no physical regulator is found,
+ * allowing most consumers to proceed as though a regulator were
+ * configured. This allows systems such as those with software
+ * controllable regulators for the CPU core only to be brought up more
+ * readily.
+ */
+void regulator_use_dummy_regulator(void)
+{
+ board_wants_dummy_regulator = true;
+}
+EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
+
+/**
* rdev_get_drvdata - get rdev regulator driver data
* @rdev: regulator
*