From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Thu, 9 Aug 2012 15:42:19 +0000 (+0100)
Subject: regulator: core: Use list_voltage() to read single voltage regulators
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f7df20ec323009bd2ea8e1c65f11bb43fd526c4f;p=linux-beck.git

regulator: core: Use list_voltage() to read single voltage regulators

If the regulator doesn't supply a way of reading back the voltage but does
provide a list_voltage() operation then use that with a selector of zero
to read the voltage.  Regulators doing this means that we have the list
operation there for consumers that want to configure themselves.

Reported-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 157def15ed78..ff8f54447305 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2395,6 +2395,8 @@ static int _regulator_get_voltage(struct regulator_dev *rdev)
 		ret = rdev->desc->ops->list_voltage(rdev, sel);
 	} else if (rdev->desc->ops->get_voltage) {
 		ret = rdev->desc->ops->get_voltage(rdev);
+	} else if (rdev->desc->ops->list_voltage) {
+		ret = rdev->desc->ops->list_voltage(rdev, 0);
 	} else {
 		return -EINVAL;
 	}