[PATCH] hmc5843 - add basic dt support

[NeilBrown]

No configuration, just a compatible string and documentation.

Signed-off-by: NeilBrown <neilb@xxxxxxx>

diff --git a/Documentation/devicetree/bindings/iio/magnetometer/hmc5843.txt b/Documentation/devicetree/bindings/iio/magnetometer/hmc5843.txt
new file mode 100644
index 000000000000..90d5f34db04e
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/magnetometer/hmc5843.txt
@@ -0,0 +1,17 @@
+* Honeywell HMC5843 magnetometer sensor
+
+Required properties:
+
+  - compatible : should be "honeywell,hmc5843"
+  - reg : the I2C address of the magnetometer - typically 0x1e
+
+Optional properties:
+
+  - gpios : should be device tree identifier of the magnetometer DRDY pin
+
+Example:
+
+hmc5843@1e {
+        compatible = "honeywell,hmc5843"
+        reg = <0x1e>;
+};
diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843.c
index c3f3f539e787..829734a82f69 100644
--- a/drivers/staging/iio/magnetometer/hmc5843.c
+++ b/drivers/staging/iio/magnetometer/hmc5843.c
@@ -719,10 +719,17 @@ static const struct i2c_device_id hmc5843_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, hmc5843_id);
 
+static const struct of_device_id hmc5843_of_match[] = {
+	{ .compatible = "honeywell,hmc5843" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, hmc5843_of_match);
+
 static struct i2c_driver hmc5843_driver = {
 	.driver = {
 		.name	= "hmc5843",
 		.pm	= HMC5843_PM_OPS,
+		.of_match_table = of_match_ptr(hmc5843_of_match),
 	},
 	.id_table	= hmc5843_id,
 	.probe		= hmc5843_probe,

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