Squashed 'dts/upstream/' content from commit aaba2d45dc2a

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diff --git a/Bindings/iio/adc/ti,adc084s021.yaml b/Bindings/iio/adc/ti,adc084s021.yaml
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+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,adc084s021.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments ADC084S021 ADC
+
+maintainers:
+  - Mårten Lindahl <martenli@axis.com>
+
+description: |
+  8 bit ADC with 4 channels
+
+properties:
+  compatible:
+    const: ti,adc084s021
+
+  reg:
+    maxItems: 1
+
+  vref-supply:
+    description: External reference, needed to establish input scaling
+
+  spi-cpol: true
+  spi-cpha: true
+
+  "#io-channel-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - vref-supply
+  - spi-cpol
+  - spi-cpha
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "ti,adc084s021";
+            reg = <0>;
+            vref-supply = <&adc_vref>;
+            spi-cpol;
+            spi-cpha;
+            spi-max-frequency = <16000000>;
+            #io-channel-cells = <1>;
+        };
+    };
+...