xref: /openbmc/linux/Documentation/devicetree/bindings/iio/resolver/adi,ad2s90.yaml (revision 85250a24)

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/resolver/adi,ad2s90.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Analog Devices AD2S90 Resolver-to-Digital Converter

maintainers:
  - Matheus Tavares <matheus.bernardino@usp.br>

description: |
  Datasheet: https://www.analog.com/en/products/ad2s90.html

properties:
  compatible:
    const: adi,ad2s90

  reg:
    maxItems: 1

  spi-max-frequency:
    maximum: 830000
    description: |
      Chip's max frequency, as specified in its datasheet, is 2Mhz. But a 600ns
      delay is expected between the application of a logic LO to CS and the
      application of SCLK, as also specified. And since the delay is not
      implemented in the spi code, to satisfy it, SCLK's period should be at
      most 2 * 600ns, so the max frequency should be 1 / (2 * 6e-7), which gives
      roughly 830000Hz.

  spi-cpol: true

  spi-cpha: true

required:
  - compatible
  - reg

dependencies:
  spi-cpol: [ spi-cpha ]
  spi-cpha: [ spi-cpol ]

allOf:
  - $ref: /schemas/spi/spi-peripheral-props.yaml#

unevaluatedProperties: false

examples:
  - |
    spi {
        #address-cells = <1>;
        #size-cells = <0>;

        resolver@0 {
            compatible = "adi,ad2s90";
            reg = <0>;
            spi-max-frequency = <830000>;
            spi-cpol;
            spi-cpha;
        };
    };
...