dt-bindings: hwmon: ibmpowernv: convert to dtschema

Convert existing binding to support validation.

The binding has been renamed to match its compatible strings, with no
further additions.

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20240322-hwmon_dtschema-v3-2-6697de2a8228@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/hwmon/ibm,opal-sensor.yaml

@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/ibm,opal-sensor.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: IBM POWERNV platform sensors
+
+maintainers:
+  - Javier Carrasco <javier.carrasco.cruz@gmail.com>
+
+properties:
+  compatible:
+    enum:
+      - ibm,opal-sensor-cooling-fan
+      - ibm,opal-sensor-amb-temp
+      - ibm,opal-sensor-power-supply
+      - ibm,opal-sensor-power
+
+  sensor-id:
+    description:
+      An opaque id provided by the firmware to the kernel, identifies a
+      given sensor and its attribute data.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+required:
+  - compatible
+  - sensor-id
+
+additionalProperties: false
+
+examples:
+  - |
+    sensor {
+        compatible = "ibm,opal-sensor-cooling-fan";
+        sensor-id = <0x7052107>;
+    };

Documentation/devicetree/bindings/hwmon/ibmpowernv.txt

@@ -1,23 +0,0 @@
-IBM POWERNV platform sensors
-----------------------------
-
-Required node properties:
-- compatible: must be one of
-		"ibm,opal-sensor-cooling-fan"
-		"ibm,opal-sensor-amb-temp"
-		"ibm,opal-sensor-power-supply"
-		"ibm,opal-sensor-power"
-- sensor-id: an opaque id provided by the firmware to the kernel, identifies a
-	     given sensor and its attribute data
-
-Example sensors node:
-
-cooling-fan#8-data {
-	sensor-id = <0x7052107>;
-	compatible = "ibm,opal-sensor-cooling-fan";
-};
-
-amb-temp#1-thrs {
-	sensor-id = <0x5096000>;
-	compatible = "ibm,opal-sensor-amb-temp";
-};