dt-bindings: iio: accel: bma400: add bindings

Add devicetree binding for the Bosch BMA400 3-axes ultra-low power
accelerometer sensor.

Signed-off-by: Dan Robertson <dan@dlrobertson.com>

Documentation/devicetree/bindings/iio/accel/bma400.yaml

@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/accel/bma400.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bosch BMA400 triaxial acceleration sensor
+
+maintainers:
+  - Dan Robertson <dan@dlrobertson.com>
+
+description: |
+  Acceleration and temerature iio sensors with an i2c interface
+
+  Specifications about the sensor can be found at:
+    https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMA400-DS000.pdf
+
+properties:
+  compatible:
+    enum:
+      - bosch,bma400
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    i2c0 {
+      #address-cells = <1>;
+      #size-cells = <1>;
+      bma400@14 {
+        compatible = "bosch,bma400";
+        reg = <0x14>;
+      };
+    };