dt-bindings: hwmon: gpio-fan: Convert txt bindings to yaml

Convert fan devices connected to GPIOs to the YAML syntax.
Signed-off-by: David Heidelberg <david@ixit.cz>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20231209171653.85468-1-david@ixit.czSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/hwmon/gpio-fan.txt

-Bindings for fan connected to GPIO lines
-
-Required properties:
-- compatible : "gpio-fan"
-
-Optional properties:
-- gpios: Specifies the pins that map to bits in the control value,
-  ordered MSB-->LSB.
-- gpio-fan,speed-map: A mapping of possible fan RPM speeds and the
-  control value that should be set to achieve them. This array
-  must have the RPM values in ascending order.
-- alarm-gpios: This pin going active indicates something is wrong with
-  the fan, and a udev event will be fired.
-- #cooling-cells: If used as a cooling device, must be <2>
-  Also see:
-  Documentation/devicetree/bindings/thermal/thermal-cooling-devices.yaml
-  min and max states are derived from the speed-map of the fan.
-
-Note: At least one the "gpios" or "alarm-gpios" properties must be set.
-
-Examples:
-
-	gpio_fan {
-		compatible = "gpio-fan";
-		gpios = <&gpio1 14 1
-			 &gpio1 13 1>;
-		gpio-fan,speed-map = <0    0
-				      3000 1
-				      6000 2>;
-		alarm-gpios = <&gpio1 15 1>;
-	};
-	gpio_fan_cool: gpio_fan {
-		compatible = "gpio-fan";
-		gpios = <&gpio2 14 1
-			 &gpio2 13 1>;
-		gpio-fan,speed-map =	<0    0>,
-					<3000 1>,
-					<6000 2>;
-		alarm-gpios = <&gpio2 15 1>;
-		#cooling-cells = <2>; /* min followed by max */
-	};

Documentation/devicetree/bindings/hwmon/gpio-fan.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/gpio-fan.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Fan connected to GPIO lines
+
+maintainers:
+  - Rob Herring <robh@kernel.org>
+
+properties:
+  compatible:
+    const: gpio-fan
+
+  gpios:
+    description: |
+      Specifies the pins that map to bits in the control value,
+      ordered MSB-->LSB.
+    minItems: 1
+    maxItems: 7
+
+  alarm-gpios:
+    maxItems: 1
+
+  gpio-fan,speed-map:
+    $ref: /schemas/types.yaml#/definitions/uint32-matrix
+    minItems: 2
+    maxItems: 127
+    items:
+      items:
+        - description: fan speed in RPMs
+        - description: control value
+    description: |
+      A mapping of possible fan RPM speeds and the
+      control value that should be set to achieve them. This array
+      must have the RPM values in ascending order.
+
+  '#cooling-cells':
+    const: 2
+
+required:
+  - compatible
+  - gpios
+  - gpio-fan,speed-map
+
+additionalProperties: false
+
+examples:
+  - |
+    gpio-fan {
+      compatible = "gpio-fan";
+      gpios = <&gpio2 14 1
+               &gpio2 13 1>;
+      gpio-fan,speed-map = <   0 0>,
+                           <3000 1>,
+                           <6000 2>;
+      alarm-gpios = <&gpio2 15 1>;
+      #cooling-cells = <2>; /* min followed by max */
+    };