[PATCH 5/8] dt-bindings: iio: add sigma delta modulator backend

[Olivier Moysan <olivier.moysan@foss.st.com>]

Add documentation of device tree bindings to support
sigma delta modulator backend in IIO framework.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
---
 .../iio/adc/sd-modulator-backend.yaml         | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/sd-modulator-backend.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/sd-modulator-backend.yaml b/Documentation/devicetree/bindings/iio/adc/sd-modulator-backend.yaml
new file mode 100644
index 000000000000..b0fa71b75cd0
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/sd-modulator-backend.yaml
@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/sd-modulator-backend.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sigma delta modulator backend
+
+maintainers:
+  - Olivier Moysan <olivier.moysan@foss.st.com>
+
+properties:
+  compatible:
+    description: |
+      "sd-backend" can be used as a generic SD modulator backend,
+      if the modulator is not specified in the compatible list.
+    enum:
+      - sd-backend
+      - ads1201
+
+  '#io-backend-cells':
+    const: 0
+
+  reg:
+    maxItems: 1
+
+  vref-supply:
+    description: Phandle to the vref input analog reference voltage.
+
+required:
+  - compatible
+  - '#io-backend-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    ads1201: adc {
+      compatible = "sd-backend";
+      #io-backend-cells = <0>;
+    };
+
+...
-- 
2.25.1