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Commit 63d5d525 authored by Gregor Boirie's avatar Gregor Boirie Committed by Jonathan Cameron
Browse files

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: default avatarGregor Boirie <gregor.boirie@parrot.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent d3546af6

Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt

+2 −0
Original line number Diff line number Diff line
@@ -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>;

};

drivers/iio/magnetometer/ak8975.c

+16 −0
Original line number Diff line number Diff line
@@ -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