dt-bindings: hwmon: adi,ltc2945: Add binding

Create initial binding for the LTC2945 I2C power monitor.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jonathan Cormier <jcormier@criticallink.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/hwmon/adi,ltc2945.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/adi,ltc2945.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices LTC2945 wide range i2c power monitor
+
+maintainers:
+  - Guenter Roeck <linux@roeck-us.net>
+
+description: |
+  Analog Devices LTC2945 wide range i2c power monitor over I2C.
+
+  https://www.analog.com/media/en/technical-documentation/data-sheets/LTC2945.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ltc2945
+
+  reg:
+    maxItems: 1
+
+  shunt-resistor-micro-ohms:
+    description:
+      Shunt resistor value in micro-Ohms
+    default: 1000
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        power-monitor@6e {
+            compatible = "adi,ltc2945";
+            reg = <0x6e>;
+            /* 10 milli-Ohm shunt resistor */
+            shunt-resistor-micro-ohms = <10000>;
+        };
+    };
+...