FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/spi/fsl-imx-cspi.txt

     * Freescale (Enhanced) Configurable Serial Peripheral Interface
       (CSPI/eCSPI) for i.MX
     
     Required properties:
     - compatible :
       - "fsl,imx1-cspi" for SPI compatible with the one integrated on i.MX1
       - "fsl,imx21-cspi" for SPI compatible with the one integrated on i.MX21
       - "fsl,imx27-cspi" for SPI compatible with the one integrated on i.MX27
       - "fsl,imx31-cspi" for SPI compatible with the one integrated on i.MX31
      - "fsl,imx35-cspi" for SPI compatible with the one integrated on i.MX35
      - "fsl,imx51-ecspi" for SPI compatible with the one integrated on i.MX51
      - "fsl,imx53-ecspi" for SPI compatible with the one integrated on i.MX53 and later Soc
      - "fsl,imx8mq-ecspi" for SPI compatible with the one integrated on i.MX8MQ
      - "fsl,imx8mm-ecspi" for SPI compatible with the one integrated on i.MX8MM
      - "fsl,imx8mn-ecspi" for SPI compatible with the one integrated on i.MX8MN
      - "fsl,imx8mp-ecspi" for SPI compatible with the one integrated on i.MX8MP
    - reg : Offset and length of the register set for the device
    - interrupts : Should contain CSPI/eCSPI interrupt
    - clocks : Clock specifiers for both ipg and per clocks.
    - clock-names : Clock names should include both "ipg" and "per"
    See the clock consumer binding,
            Documentation/devicetree/bindings/clock/clock-bindings.txt
    
    Recommended properties:
    - cs-gpios : GPIOs to use as chip selects, see spi-bus.txt.  While the native chip
    select lines can be used, they appear to always generate a pulse between each
    word of a transfer.  Most use cases will require GPIO based chip selects to
    generate a valid transaction.
    
    Optional properties:
    - num-cs :  Number of total chip selects, see spi-bus.txt.
    - dmas: DMA specifiers for tx and rx dma. See the DMA client binding,
    Documentation/devicetree/bindings/dma/dma.txt.
    - dma-names: DMA request names, if present, should include "tx" and "rx".
    - fsl,spi-rdy-drctl: Integer, representing the value of DRCTL, the register
    controlling the SPI_READY handling. Note that to enable the DRCTL consideration,
    the SPI_READY mode-flag needs to be set too.
    Valid values are: 0 (disabled), 1 (edge-triggered burst) and 2 (level-triggered burst).
    
    Obsolete properties:
    - fsl,spi-num-chipselects : Contains the number of the chipselect
    
    Example:
    
    ecspi@70010000 {
            #address-cells = <1>;
            #size-cells = <0>;
            compatible = "fsl,imx51-ecspi";
            reg = <0x70010000 0x4000>;
            interrupts = <36>;
            cs-gpios = <&gpio3 24 0>, /* GPIO3_24 */
                       <&gpio3 25 0>; /* GPIO3_25 */
            dmas = <&sdma 3 7 1>, <&sdma 4 7 2>;
            dma-names = "rx", "tx";
            fsl,spi-rdy-drctl = <1>;
    };

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