staging:iio:hmc5843: Add support for i2c hmc5983

This patch adds support for the hmc5983 i2c interface.
This chip is almost identical to the hmc5883. The difference being added
temperature compensation, additional available sample rate (220Hz) and an SPI
interface.

Signed-off-by: Josef Gajdusek <atx@atx.name>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/Documentation/devicetree/bindings/iio/magnetometer/hmc5843.txt b/Documentation/devicetree/bindings/iio/magnetometer/hmc5843.txt
index b8cbdd5..8e191ee 100644
--- a/Documentation/devicetree/bindings/iio/magnetometer/hmc5843.txt
+++ b/Documentation/devicetree/bindings/iio/magnetometer/hmc5843.txt
@@ -6,6 +6,7 @@
   Other models which are supported with driver are:
 	"honeywell,hmc5883"
 	"honeywell,hmc5883l"
+	"honeywell,hmc5983"
   - reg : the I2C address of the magnetometer - typically 0x1e
 
 Optional properties: