FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/spi/spi-peripheral-props.yaml

     # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
     %YAML 1.2
     ---
     $id: http://devicetree.org/schemas/spi/spi-peripheral-props.yaml#
     $schema: http://devicetree.org/meta-schemas/core.yaml#
     
     title: Peripheral-specific properties for a SPI bus.
     
     description:
      Many SPI controllers need to add properties to peripheral devices. They could
      be common properties like spi-max-frequency, spi-cpha, etc. or they could be
      controller specific like delay in clock or data lines, etc. These properties
      need to be defined in the peripheral node because they are per-peripheral and
      there can be multiple peripherals attached to a controller. All those
      properties are listed here. The controller specific properties should go in
      their own separate schema that should be referenced from here.
    
    maintainers:
      - Mark Brown <broonie@kernel.org>
    
    properties:
      reg:
        minItems: 1
        maxItems: 256
        items:
          items:
            - minimum: 0
              maximum: 256
        description:
          Chip select used by the device.
    
      spi-3wire:
        $ref: /schemas/types.yaml#/definitions/flag
        description:
          The device requires 3-wire mode.
    
      spi-cs-high:
        $ref: /schemas/types.yaml#/definitions/flag
        description:
          The device requires the chip select active high.
    
      spi-lsb-first:
        $ref: /schemas/types.yaml#/definitions/flag
        description:
          The device requires the LSB first mode.
    
      spi-max-frequency:
        $ref: /schemas/types.yaml#/definitions/uint32
        description:
          Maximum SPI clocking speed of the device in Hz.
    
      spi-rx-bus-width:
        description:
          Bus width to the SPI bus used for read transfers.
          If 0 is provided, then no RX will be possible on this device.
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1, 2, 4, 8]
        default: 1
    
      spi-rx-delay-us:
        description:
          Delay, in microseconds, after a read transfer.
    
      rx-sample-delay-ns:
        description: SPI Rx sample delay offset, unit is nanoseconds.
          The delay from the default sample time before the actual
          sample of the rxd input signal occurs.
    
      spi-tx-bus-width:
        description:
          Bus width to the SPI bus used for write transfers.
          If 0 is provided, then no TX will be possible on this device.
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1, 2, 4, 8]
        default: 1
    
      spi-tx-delay-us:
        description:
          Delay, in microseconds, after a write transfer.
    
      stacked-memories:
        description: Several SPI memories can be wired in stacked mode.
          This basically means that either a device features several chip
          selects, or that different devices must be seen as a single
          bigger chip. This basically doubles (or more) the total address
          space with only a single additional wire, while still needing
          to repeat the commands when crossing a chip boundary. The size of
          each chip should be provided as members of the array.
        $ref: /schemas/types.yaml#/definitions/uint64-array
        minItems: 2
        maxItems: 4
    
      parallel-memories:
        description: Several SPI memories can be wired in parallel mode.
          The devices are physically on a different buses but will always
          act synchronously as each data word is spread across the
          different memories (eg. even bits are stored in one memory, odd
          bits in the other). This basically doubles the address space and
          the throughput while greatly complexifying the wiring because as
         many busses as devices must be wired. The size of each chip should
         be provided as members of the array.
       $ref: /schemas/types.yaml#/definitions/uint64-array
       minItems: 2
       maxItems: 4
   
   # The controller specific properties go here.
   allOf:
     - $ref: cdns,qspi-nor-peripheral-props.yaml#
     - $ref: samsung,spi-peripheral-props.yaml#
     - $ref: nvidia,tegra210-quad-peripheral-props.yaml#
   
   additionalProperties: true

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