dt-bindings: iio: accel: Add binding documentation for ADXL313

Add device tree binding documentation for ADXL313 3-axis accelerometer.

Signed-off-by: Lucas Stankus <lucas.p.stankus@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/2eff22d1d22f7e72efdabdc681d02e922682c434.1630523106.git.lucas.p.stankus@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/accel/adi,adxl313.yaml

@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/accel/adi,adxl313.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices ADXL313 3-Axis Digital Accelerometer
+
+maintainers:
+  - Lucas Stankus <lucas.p.stankus@gmail.com>
+
+description: |
+  Analog Devices ADXL313 3-Axis Digital Accelerometer that supports
+  both I2C & SPI interfaces.
+    https://www.analog.com/en/products/adxl313.html
+
+properties:
+  compatible:
+    enum:
+      - adi,adxl313
+
+  reg:
+    maxItems: 1
+
+  spi-3wire: true
+
+  spi-max-frequency: true
+
+  vs-supply:
+    description: Regulator that supplies power to the accelerometer
+
+  vdd-supply:
+    description: Regulator that supplies the digital interface supply voltage
+
+  interrupts:
+    minItems: 1
+    maxItems: 2
+
+  interrupt-names:
+    minItems: 1
+    maxItems: 2
+    items:
+      enum:
+        - INT1
+        - INT2
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        /* Example for a I2C device node */
+        accelerometer@53 {
+            compatible = "adi,adxl313";
+            reg = <0x53>;
+            interrupt-parent = <&gpio0>;
+            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "INT1";
+        };
+    };
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        /* Example for a SPI device node */
+        accelerometer@0 {
+            compatible = "adi,adxl313";
+            reg = <0>;
+            spi-max-frequency = <5000000>;
+            interrupt-parent = <&gpio0>;
+            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "INT1";
+        };
+    };