iio:magnetometer:ak8975: 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 ak8975 DTS entry as a "vdd-supply" property.
Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 896b13e3..72c03d9 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -32,6 +32,7 @@
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/acpi.h>
+#include <linux/regulator/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@@ -379,8 +380,23 @@
enum asahi_compass_chipset type)
{
u8 wia_val[2];
+ struct regulator *vdd = devm_regulator_get_optional(&client->dev,
+ "vdd");
int ret;
+ /* Enable attached regulator if any. */
+ if (!IS_ERR(vdd)) {
+ ret = regulator_enable(vdd);
+ if (ret) {
+ dev_err(&client->dev, "Failed to enable Vdd supply\n");
+ return ret;
+ }
+ } else {
+ ret = PTR_ERR(vdd);
+ if (ret != -ENODEV)
+ return ret;
+ }
+
/*
* Signature for each device:
* Device | WIA1 | WIA2