summaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorThomas Petazzoni <t-petazzoni@ti.com>2010-12-03 11:31:07 +0100
committerLiam Girdwood <lrg@slimlogic.co.uk>2011-01-12 14:33:01 +0000
commit05fda3b1abc23d832144e9497fb218870927d645 (patch)
tree6f847a88c7d6fbbdc90b6457cc29acc252b0e92a /drivers
parent5da84fd99bb1ab1c7cd39d0cf7c08bb63931a59a (diff)
regulator: Take into account the requirements of all consumers
Extend the regulator_set_voltage() function to take into account the voltage requirements of all consumers of the regulator being changed, in order to set the voltage to the minimum voltage acceptable to all consumers. The existing behaviour was that the latest regulator_set_voltage() call would win over previous regulator_set_voltage() calls even if setting the voltage to a non-acceptable level from other consumers. Signed-off-by: Thomas Petazzoni <t-petazzoni@ti.com> Cc: Liam Girdwood <lrg@slimlogic.co.uk> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Kevin Hilman <khilman@deeprootsystems.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/regulator/core.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e63366f826f9..a1b12379b09f 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -142,6 +142,27 @@ static int regulator_check_voltage(struct regulator_dev *rdev,
return 0;
}
+/* Make sure we select a voltage that suits the needs of all
+ * regulator consumers
+ */
+static int regulator_check_consumers(struct regulator_dev *rdev,
+ int *min_uV, int *max_uV)
+{
+ struct regulator *regulator;
+
+ list_for_each_entry(regulator, &rdev->consumer_list, list) {
+ if (*max_uV > regulator->max_uV)
+ *max_uV = regulator->max_uV;
+ if (*min_uV < regulator->min_uV)
+ *min_uV = regulator->min_uV;
+ }
+
+ if (*min_uV > *max_uV)
+ return -EINVAL;
+
+ return 0;
+}
+
/* current constraint check */
static int regulator_check_current_limit(struct regulator_dev *rdev,
int *min_uA, int *max_uA)
@@ -1637,6 +1658,10 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
regulator->min_uV = min_uV;
regulator->max_uV = max_uV;
+ ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
+ if (ret < 0)
+ goto out;
+
trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, &selector);