FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/iio/resolver/adi,ad2s90.yaml

     # 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
    
    additionalProperties: false
    
    required:
      - compatible
      - reg
    
    dependencies:
      spi-cpol: [ spi-cpha ]
      spi-cpha: [ spi-cpol ]
    
    examples:
      - |
        spi {
            #address-cells = <1>;
            #size-cells = <0>;
    
            resolver@0 {
                compatible = "adi,ad2s90";
                reg = <0>;
                spi-max-frequency = <830000>;
                spi-cpol;
                spi-cpha;
            };
        };
    ...

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