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Date:	Mon,  3 Feb 2014 21:54:28 -0800
From:	Bjorn Andersson <>
To:	Liam Girdwood <>,
	Mark Brown <>,,,
Subject: [PATCH] regulator: core: Make regulator object reflect configured voltage

In the case when a regulator is initialized from DT with equal min and max
voltages the voltage is applied on initialization and future calls to
regulator_set_voltage fails. This behavious is different than if the regulator
is configured to be a span and therefor requires logic to handle this
difference in the consumer driver.

Eliminate this difference by populating the min_uV and max_uV of the newly
created regulator from the constraints so that calles to regulator_set_voltage
is considered no-ops and not a failure.

Signed-off-by: Bjorn Andersson <>
 drivers/regulator/core.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index d85f313..9c82d37 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1209,6 +1209,16 @@ static struct regulator *create_regulator(struct regulator_dev *rdev,
 		regulator->always_on = true;
+	/*
+	 * Make the regulator reflect the configured voltage selected in
+	 * machine_constraints_voltage()
+	 */
+	if (rdev->constraints->apply_uV &&
+	    rdev->constraints->min_uV == rdev->constraints->max_uV) {
+		regulator->min_uV = rdev->constraints->min_uV;
+		regulator->max_uV = rdev->constraints->min_uV;
+	}
 	return regulator;

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