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The magnetometer's power supplies could be controllable on some platforms, such as i.MX6Q-SABRESD board, the mag3110's power supplies are controlled by a GPIO fixed regulator, need to make sure the regulators are enabled before any communication with mag3110, this patch adds vdd/vddio regulator operation support. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>