dt-bindings: hwmon: add MAX31827

MAX31827 is a low-power temperature switch with I2C interface.

The device is a ±1°C accuracy from -40°C to +125°C
(12 bits) local temperature switch and sensor with I2C/SM-
Bus interface. The combination of small 6-bump wafer-lev-
el package (WLP) and high accuracy makes this temper-
ature sensor/switch ideal for a wide range of applications.

Signed-off-by: Daniel Matyas <daniel.matyas@analog.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230524160131.14081-1-daniel.matyas@analog.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/hwmon/adi,max31827.yaml

@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/adi,max31827.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices MAX31827, MAX31828, MAX31829 Low-Power Temperature Switch
+
+maintainers:
+  - Daniel Matyas <daniel.matyas@analog.com>
+
+description: |
+  Analog Devices MAX31827, MAX31828, MAX31829 Low-Power Temperature Switch with
+  I2C Interface
+  https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31827-MAX31829.pdf
+
+properties:
+  compatible:
+    oneOf:
+      - const: adi,max31827
+      - items:
+          - enum:
+              - adi,max31828
+              - adi,max31829
+          - const: adi,max31827
+
+  reg:
+    maxItems: 1
+
+  vref-supply:
+    description:
+      Must have values in the interval (1.6V; 3.6V) in order for the device to
+      function correctly.
+
+required:
+  - compatible
+  - reg
+  - vref-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        temperature-sensor@42 {
+            compatible = "adi,max31827";
+            reg = <0x42>;
+            vref-supply = <&reg_vdd>;
+        };
+    };
+...

MAINTAINERS

@@ -12617,6 +12617,13 @@ F:	Documentation/userspace-api/media/drivers/max2175.rst
 F:	drivers/media/i2c/max2175*
 F:	include/uapi/linux/max2175.h
 
+MAX31827 TEMPERATURE SWITCH DRIVER
+M:	Daniel Matyas <daniel.matyas@analog.com>
+L:	linux-hwmon@vger.kernel.org
+S:	Supported
+W:	http://ez.analog.com/community/linux-device-drivers
+F:	Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
+
 MAX6650 HARDWARE MONITOR AND FAN CONTROLLER DRIVER
 L:	linux-hwmon@vger.kernel.org
 S:	Orphan