From 3145229f91916723b07c098c0d88b7d01db6c316 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Gr=C3=A9gor=20Boirie?= <gregor.boirie@parrot.com>
Date: Wed, 17 Feb 2016 18:52:51 +0100
Subject: [PATCH] iio:pressure:ms5611: power regulator support

Add support for an optional regulator which, if found into device-tree,
will power on device at probing time.
The regulator is declared into ms5611 DTS entry as a "vdd-supply" property.

Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---
 drivers/iio/pressure/ms5611_core.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/iio/pressure/ms5611_core.c b/drivers/iio/pressure/ms5611_core.c
index acd8e37195bc..992ad8d3b67a 100644
--- a/drivers/iio/pressure/ms5611_core.c
+++ b/drivers/iio/pressure/ms5611_core.c
@@ -16,6 +16,7 @@
 #include <linux/module.h>
 #include <linux/iio/iio.h>
 #include <linux/delay.h>
+#include <linux/regulator/consumer.h>
 
 #include <linux/iio/buffer.h>
 #include <linux/iio/triggered_buffer.h>
@@ -290,6 +291,18 @@ static const struct iio_info ms5611_info = {
 static int ms5611_init(struct iio_dev *indio_dev)
 {
 	int ret;
+	struct regulator *vdd = devm_regulator_get(indio_dev->dev.parent,
+	                                           "vdd");
+
+	/* Enable attached regulator if any. */
+	if (!IS_ERR(vdd)) {
+		ret = regulator_enable(vdd);
+		if (ret) {
+			dev_err(indio_dev->dev.parent,
+			        "failed to enable Vdd supply: %d\n", ret);
+			return ret;
+		}
+	}
 
 	ret = ms5611_reset(indio_dev);
 	if (ret < 0)
-- 
2.20.1