dt-bindings:iio:adc:ti,ads1015 yaml conversion

This binding was moved over from hwmon some time ago so is a bit
unusual in terms of IIO bindings.  However, conversion was fairly
straight forwards.

I've listed both Dirk (who think wrote original binding) and Daniel
who added the IIO driver for this device.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/20200909175946.395313-17-jic23@kernel.org

Documentation/devicetree/bindings/iio/adc/ti,ads1015.yaml

@@ -0,0 +1,112 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,ads1015.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI ADS1015 4 channel I2C analog to digital converter
+
+maintainers:
+  - Daniel Baluta <daniel.baluta@nxp.com>
+
+description: |
+  Datasheet at: https://www.ti.com/lit/gpn/ads1015
+  Supports both single ended and differential channels.
+
+properties:
+  compatible:
+    const: ti,ads1015
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  "#io-channel-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties: false
+
+patternProperties:
+  "^channel@[0-7]+$":
+    type: object
+    description:
+      Child nodes needed for each channel that the platform uses.
+
+    properties:
+      reg:
+        description: |
+          0: Voltage over AIN0 and AIN1.
+          1: Voltage over AIN0 and AIN3.
+          2: Voltage over AIN1 and AIN3.
+          3: Voltage over AIN2 and AIN3.
+          4: Voltage over AIN0 and GND.
+          5: Voltage over AIN1 and GND.
+          6: Voltage over AIN2 and GND.
+          7: Voltage over AIN3 and GND.
+        items:
+          - minimum: 0
+            maximum: 7
+
+      ti,gain:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 5
+        description: |
+          pga is the programmable gain amplifier (values are full scale)
+          0: +/- 6.144 V
+          1: +/- 4.096 V
+          2: +/- 2.048 V (default)
+          3: +/- 1.024 V
+          4: +/- 0.512 V
+          5: +/- 0.256 V
+
+      ti,datarate:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 6
+        description: |
+          Data acquisition rate in samples per second
+          0: 128
+          1: 250
+          2: 490
+          3: 920
+          4: 1600 (default)
+          5: 2400
+          6: 3300
+
+    required:
+      - reg
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@49 {
+            compatible = "ti,ads1015";
+            reg = <0x49>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+            channel@0 {
+              reg = <0>;
+            };
+            channel@4 {
+              reg = <4>;
+              ti,gain = <3>;
+              ti,datarate = <5>;
+            };
+        };
+    };
+...