dt-bindings: iio: imu: smi330: Add binding

Add devicetree binding for Bosch imu smi330.
The smi330 is a combined three axis angular rate and
three axis acceleration sensor module.

Signed-off-by: Jianping Shen <Jianping.Shen@de.bosch.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/Documentation/devicetree/bindings/iio/imu/bosch,smi330.yaml b/Documentation/devicetree/bindings/iio/imu/bosch,smi330.yaml
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+++ b/Documentation/devicetree/bindings/iio/imu/bosch,smi330.yaml
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/imu/bosch,smi330.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bosch SMI330 6-Axis IMU
+
+maintainers:
+  - Stefan Gutmann <stefam.gutmann@de.bosch.com>
+
+description:
+  SMI330 is a 6-axis inertial measurement unit that supports acceleration and
+  gyroscopic measurements with hardware fifo buffering. Sensor also provides
+  events information such as motion, no-motion and tilt detection.
+
+properties:
+  compatible:
+    const: bosch,smi330
+
+  reg:
+    maxItems: 1
+
+  vdd-supply:
+    description: provide VDD power to the sensor.
+
+  vddio-supply:
+    description: provide VDD IO power to the sensor.
+
+  interrupts:
+    minItems: 1
+    maxItems: 2
+
+  interrupt-names:
+    minItems: 1
+    maxItems: 2
+    items:
+      enum:
+        - INT1
+        - INT2
+
+  drive-open-drain:
+    type: boolean
+    description:
+      set if the interrupt pin(s) should be configured as
+      open drain. If not set, defaults to push-pull.
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    // Example for I2C
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        imu@68 {
+            compatible = "bosch,smi330";
+            reg = <0x68>;
+            vddio-supply = <&vddio>;
+            vdd-supply = <&vdd>;
+            interrupt-parent = <&gpio>;
+            interrupts = <26 IRQ_TYPE_EDGE_RISING>;
+            interrupt-names = "INT1";
+        };
+    };
+
+    // Example for SPI
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        imu@0 {
+            compatible = "bosch,smi330";
+            reg = <0>;
+            spi-max-frequency = <10000000>;
+            interrupt-parent = <&gpio>;
+            interrupts = <26 IRQ_TYPE_EDGE_RISING>;
+            interrupt-names = "INT1";
+        };
+    };