dt-bindings: iio: adc: convert sd modulator to json-schema

Device-Tree bindings for sigma delta modulator

Required properties:

- compatible: should be "ads1201", "sd-modulator". "sd-modulator" can be use

	as a generic SD modulator if modulator not specified in compatible list.

- #io-channel-cells = <0>: See the IIO bindings section "IIO consumers".

Example node:

	ads1202: adc {

		compatible = "sd-modulator";

		#io-channel-cells = <0>;

	};

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/iio/adc/sigma-delta-modulator.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Device-Tree bindings for sigma delta modulator

maintainers:

  - Arnaud Pouliquen <arnaud.pouliquen@st.com>

properties:

  compatible:

    description: |

      "sd-modulator" can be used as a generic SD modulator,

      if the modulator is not specified in the compatible list.

    enum:

      - sd-modulator

      - ads1201

  '#io-channel-cells':

    const: 0

required:

  - compatible

  - '#io-channel-cells'

additionalProperties: false

examples:

  - |

    ads1202: adc {

      compatible = "sd-modulator";

      #io-channel-cells = <0>;

    };

...