diff options
| author | Gregor Boirie <gregor.boirie@parrot.com> | 2016-03-03 11:44:05 +0100 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2016-03-05 15:25:58 +0000 |
| commit | 63d5d525cbbc8938d9fa3d6d6fbd4183e784b6e9 (patch) | |
| tree | 1435d337719dc1786c2f203da17964e4e88e5db2 | |
| parent | d3546af67f4937075d0747adb3bf56d3c46b32f0 (diff) | |
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>
| -rw-r--r-- | Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt | 2 | ||||
| -rw-r--r-- | drivers/iio/magnetometer/ak8975.c | 16 |
2 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt index 011679f1a425..34a3206eefdf 100644 --- a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt +++ b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt @@ -8,6 +8,7 @@ Required properties: Optional properties: - gpios : should be device tree identifier of the magnetometer DRDY pin + - vdd-supply: an optional regulator that needs to be on to provide VDD Example: @@ -15,4 +16,5 @@ ak8975@0c { compatible = "asahi-kasei,ak8975"; reg = <0x0c>; gpios = <&gpj0 7 0>; + vdd-supply = <&ldo_3v3_gnss>; }; diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c index 896b13e39dae..72c03d9fbeb2 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 @@ static int ak8975_who_i_am(struct i2c_client *client, 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 |