linux-kernel - [PATCH] regulator: Set apply_uV only when min and max voltages are defined

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Date:	Wed, 25 Jan 2012 10:31:45 +0100
From:	Karol Lewandowski <k.lewandowsk@...sung.com>
To:	broonie@...nsource.wolfsonmicro.com
Cc:	linux-kernel@...r.kernel.org, m.szyprowski@...sung.com,
	s.nawrocki@...sung.com, lrg@...com,
	Karol Lewandowski <k.lewandowsk@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Thomas Abraham <thomas.abraham@...aro.org>
Subject: [PATCH] regulator: Set apply_uV only when min and max voltages are
 defined

apply_uV is errornously set when regulator is instantiated from device
tree, even when it doesn't contain any voltage constraints.

This commit fixes error:

  machine_constraints_voltage: CHARGER: failed to apply 0uV constraint

for following regulator description in DTS:

  CHARGER {
	regulator-min-microamp = <100000>;
	regulator-max-microamp = <200000>;
  }

Signed-off-by: Karol Lewandowski <k.lewandowsk@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
Cc: Thomas Abraham <thomas.abraham@...aro.org>
---
 drivers/regulator/of_regulator.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index f1651eb..679734d 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -35,7 +35,7 @@ static void of_get_regulation_constraints(struct device_node *np,
 	if (constraints->min_uV != constraints->max_uV)
 		constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
 	/* Only one voltage?  Then make sure it's set. */
-	if (constraints->min_uV == constraints->max_uV)
+	if (min_uV && max_uV && constraints->min_uV == constraints->max_uV)
 		constraints->apply_uV = true;
 
 	uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL);
-- 
1.7.8.3

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