dt-bindings:iio:dac:adi,ad5758 yaml conversion

I have put Michael as maintainer on this one. Happy to change it to
someone else though.

One issue in here, is I cannot have an example with a negative
limit on the range.  There are very few such yaml bindings in existence
but the thermal-zones.yaml has the same problem.  If there is
any means of fixing this let me know.  For now I'm sticking to
positive range values in the example.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Link: https://lore.kernel.org/r/20201031134110.724233-24-jic23@kernel.org

Documentation/devicetree/bindings/iio/dac/ad5758.txt

-Analog Devices AD5758 DAC device driver
-
-Required properties for the AD5758:
-	- compatible: Must be "adi,ad5758"
-	- reg: SPI chip select number for the device
-	- spi-max-frequency: Max SPI frequency to use (< 50000000)
-	- spi-cpha: is the only mode that is supported
-
-Required properties:
-
- - adi,dc-dc-mode: Mode of operation of the dc-to-dc converter
-		   Dynamic Power Control (DPC)
-		   In this mode, the AD5758 circuitry senses the output
-		   voltage and dynamically regulates the supply voltage,
-		   VDPC+, to meet compliance requirements plus an optimized
-		   headroom voltage for the output buffer.
-
-		   Programmable Power Control (PPC)
-		   In this mode, the VDPC+ voltage is user-programmable to
-		   a fixed level that needs to accommodate the maximum output
-		   load required.
-
-		   The output of the DAC core is either converted to a
-		   current or voltage output at the VIOUT pin. Only one mode
-		   can be enabled at any one time.
-
-		   The following values are currently supported:
-			* 1: DPC current mode
-			* 2: DPC voltage mode
-			* 3: PPC current mode
-
- Depending on the selected output mode (voltage or current) one of the
- two properties must
- be present:
-
- - adi,range-microvolt: Voltage output range
-		The array of voltage output ranges must contain two fields:
-		* <0 5000000>: 0 V to 5 V voltage range
-		* <0 10000000>: 0 V to 10 V voltage range
-		* <(-5000000) 5000000>: ±5 V voltage range
-		* <(-10000000) 10000000>: ±10 V voltage range
- - adi,range-microamp: Current output range
-		The array of current output ranges must contain two fields:
-		* <0 20000>: 0 mA to 20 mA current range
-		* <0 24000>: 0 mA to 24 mA current range
-		* <4 24000>: 4 mA to 20 mA current range
-		* <(-20000) 20000>: ±20 mA current range
-		* <(-24000) 24000>: ±24 mA current range
-		* <(-1000) 22000>: −1 mA to +22 mA current range
-
-Optional properties:
-
- - reset-gpios : GPIO spec for the RESET pin. If specified, it will be
-		 asserted during driver probe.
-
- - adi,dc-dc-ilim-microamp: The dc-to-dc converter current limit
-		   The following values are currently supported [uA]:
-			* 150000
-			* 200000
-			* 250000
-			* 300000
-			* 350000
-			* 400000
-
- - adi,slew-time-us: The time it takes for the output to reach the
- full scale [uS]
-		     The supported range is between 133us up to 1023984375us
-
-AD5758 Example:
-
-	dac@0 {
-		compatible = "adi,ad5758";
-		reg = <0>;
-		spi-max-frequency = <1000000>;
-		spi-cpha;
-
-		reset-gpios = <&gpio 22 0>;
-
-		adi,dc-dc-mode = <2>;
-		adi,range-microvolt = <0 10000000>;
-		adi,dc-dc-ilim-microamp = <200000>;
-		adi,slew-time-us = <125000>;
-	};

Documentation/devicetree/bindings/iio/dac/adi,ad5758.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/dac/adi,ad5758.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD5758 DAC
+
+maintainers:
+  - Michael Hennerich <Michael.Hennerich@analog.com>
+
+properties:
+  compatible:
+    const: adi,ad5758
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency: true
+  spi-cpha: true
+
+  adi,dc-dc-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1, 2, 3]
+    description: |
+      Mode of operation of the dc-to-dc converter
+      Dynamic Power Control (DPC)
+      In this mode, the AD5758 circuitry senses the output voltage and
+      dynamically regulates the supply voltage, VDPC+, to meet compliance
+      requirements plus an optimized headroom voltage for the output buffer.
+
+      Programmable Power Control (PPC)
+      In this mode, the VDPC+ voltage is user-programmable to a fixed level
+      that needs to accommodate the maximum output load required.
+
+      The output of the DAC core is either converted to a current or
+      voltage output at the VIOUT pin. Only one mode can be enabled at
+      any one time.
+
+      The following values are currently supported:
+      * 1: DPC current mode
+      * 2: DPC voltage mode
+      * 3: PPC current mode
+
+      Depending on the selected output mode (voltage or current) one of the
+      two properties must be present:
+
+  adi,range-microvolt:
+    $ref: /schemas/types.yaml#/definitions/int32-array
+    description: |
+      Voltage output range specified as <minimum, maximum>
+    enum:
+      - [[0, 5000000]]
+      - [[0, 10000000]]
+      - [[-5000000, 5000000]]
+      - [[-10000000, 10000000]]
+
+  adi,range-microamp:
+    $ref: /schemas/types.yaml#/definitions/int32-array
+    description: |
+      Current output range specified as <minimum, maximum>
+    enum:
+      - [[0, 20000]]
+      - [[0, 24000]]
+      - [[4, 24000]]
+      - [[-20000, 20000]]
+      - [[-24000, 24000]]
+      - [[-1000, 22000]]
+
+  reset-gpios: true
+
+  adi,dc-dc-ilim-microamp:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [150000, 200000, 250000, 300000, 350000, 400000]
+    description: |
+      The dc-to-dc converter current limit.
+
+  adi,slew-time-us:
+    description: |
+      The time it takes for the output to reach the full scale [uS]
+    minimum: 133
+    maximum: 1023984375
+
+required:
+  - compatible
+  - reg
+  - spi-cpha
+  - adi,dc-dc-mode
+
+allOf:
+  - if:
+      properties:
+        adi,dc-dc-mode:
+          contains:
+            enum: [1, 3]
+    then:
+      properties:
+        adi,range-microvolt: false
+      required:
+        - adi,range-microamp
+    else:
+      properties:
+        adi,range-microamp: false
+      required:
+        - adi,range-microvolt
+
+additionalProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        dac@0 {
+            compatible = "adi,ad5758";
+            reg = <0>;
+            spi-max-frequency = <1000000>;
+            spi-cpha;
+
+            reset-gpios = <&gpio 22 0>;
+
+            adi,dc-dc-mode = <2>;
+            adi,range-microvolt = <0 10000000>;
+            adi,dc-dc-ilim-microamp = <200000>;
+            adi,slew-time-us = <125000>;
+        };
+    };
+...