[PATCH 2/3] dt-bindings: iio: magnetometer: document the Allegro MicroSystems ALS31300 3-D Linear Hall Effect Sensor

[Neil Armstrong <neil.armstrong@linaro.org>]

Document the bindings for the Allegro MicroSystems ALS31300 3-D Linear Hall
Effect Sensor controller by an I2C interface, mainly used in 3D head-on
motion sensing applications.

The device can be configured with different sensitivities in factory,
but the sensitivity value used to calculate value into the Gauss
unit is not available from registers, thus the sensitivity is
provided by the compatible/device-id string which is based
on the part number as described in the datasheet page 2.

The datasheet is available on the product website at [1].

[1] https://www.allegromicro.com/en/products/sense/linear-and-angular-position/linear-position-sensor-ics/als31300

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
---
 .../iio/magnetometer/allegro,als31300.yaml         | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/magnetometer/allegro,als31300.yaml b/Documentation/devicetree/bindings/iio/magnetometer/allegro,als31300.yaml
new file mode 100644
index 000000000000..0a08e769f3aa
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/magnetometer/allegro,als31300.yaml
@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/magnetometer/allegromicro,als31300.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allegro MicroSystems ALS31300 3-D Linear Hall Effect sensor
+
+maintainers:
+  - Neil Armstrong <neil.armstrong@linaro.org>
+
+properties:
+  $nodename:
+    pattern: '^magnetometer@[0-9a-f]+$'
+
+  compatible:
+    enum:
+      - allegromicro,als31300-500 # Factory configured at 500 Gauss input range
+      - allegromicro,als31300-1000 # Factory configured at 1000 Gauss input range
+      - allegromicro,als31300-2000 # Factory configured at 2000 Gauss input range
+
+  reg:
+    maxItems: 1
+
+  vcc-supply:
+    description: 5.5V supply
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      sensor@61 {
+        compatible = "allegromicro,als31300";
+        reg = <0x61>;
+        vcc-supply = <&hall_vcc>;
+      };
+    };

-- 
2.34.1