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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>
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2 changed files with 18 additions and 0 deletions
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@ -8,6 +8,7 @@ Required properties:
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Optional properties:
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- gpios : should be device tree identifier of the magnetometer DRDY pin
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- vdd-supply: an optional regulator that needs to be on to provide VDD
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Example:
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@ -15,4 +16,5 @@ ak8975@0c {
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compatible = "asahi-kasei,ak8975";
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reg = <0x0c>;
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gpios = <&gpj0 7 0>;
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vdd-supply = <&ldo_3v3_gnss>;
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};
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@ -32,6 +32,7 @@
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/acpi.h>
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#include <linux/regulator/consumer.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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@ -379,8 +380,23 @@ static int ak8975_who_i_am(struct i2c_client *client,
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enum asahi_compass_chipset type)
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{
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u8 wia_val[2];
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struct regulator *vdd = devm_regulator_get_optional(&client->dev,
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"vdd");
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int ret;
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/* Enable attached regulator if any. */
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if (!IS_ERR(vdd)) {
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ret = regulator_enable(vdd);
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if (ret) {
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dev_err(&client->dev, "Failed to enable Vdd supply\n");
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return ret;
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}
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} else {
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ret = PTR_ERR(vdd);
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if (ret != -ENODEV)
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return ret;
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}
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/*
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* Signature for each device:
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* Device | WIA1 | WIA2
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