On 03/03/16 10:44, Gregor Boirie wrote:
> 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@xxxxxxxxxx>
Applied.
> ---
> .../devicetree/bindings/iio/magnetometer/ak8975.txt | 2 ++
> drivers/iio/magnetometer/ak8975.c | 16 ++++++++++++++++
> 2 files changed, 18 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt
> index 011679f..34a3206 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 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 @@ 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
>
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