FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/spi/cadence-quadspi.txt

     * Cadence Quad SPI controller
     
     Required properties:
     - compatible : should be one of the following:
             Generic default - "cdns,qspi-nor".
             For TI 66AK2G SoC - "ti,k2g-qspi", "cdns,qspi-nor".
             For TI AM654 SoC  - "ti,am654-ospi", "cdns,qspi-nor".
             For Intel LGM SoC - "intel,lgm-qspi", "cdns,qspi-nor".
     - reg : Contains two entries, each of which is a tuple consisting of a
            physical address and length. The first entry is the address and
            length of the controller register set. The second entry is the
            address and length of the QSPI Controller data area.
    - interrupts : Unit interrupt specifier for the controller interrupt.
    - clocks : phandle to the Quad SPI clock.
    - cdns,fifo-depth : Size of the data FIFO in words.
    - cdns,fifo-width : Bus width of the data FIFO in bytes.
    - cdns,trigger-address : 32-bit indirect AHB trigger address.
    
    Optional properties:
    - cdns,is-decoded-cs : Flag to indicate whether decoder is used or not.
    - cdns,rclk-en : Flag to indicate that QSPI return clock is used to latch
      the read data rather than the QSPI clock. Make sure that QSPI return
      clock is populated on the board before using this property.
    
    Optional subnodes:
    Subnodes of the Cadence Quad SPI controller are spi slave nodes with additional
    custom properties:
    - cdns,read-delay : Delay for read capture logic, in clock cycles
    - cdns,tshsl-ns : Delay in nanoseconds for the length that the master
                      mode chip select outputs are de-asserted between
                      transactions.
    - cdns,tsd2d-ns : Delay in nanoseconds between one chip select being
                      de-activated and the activation of another.
    - cdns,tchsh-ns : Delay in nanoseconds between last bit of current
                      transaction and deasserting the device chip select
                      (qspi_n_ss_out).
    - cdns,tslch-ns : Delay in nanoseconds between setting qspi_n_ss_out low
                      and first bit transfer.
    - resets        : Must contain an entry for each entry in reset-names.
                      See ../reset/reset.txt for details.
    - reset-names   : Must include either "qspi" and/or "qspi-ocp".
    
    Example:
    
            qspi: spi@ff705000 {
                    compatible = "cdns,qspi-nor";
                    #address-cells = <1>;
                    #size-cells = <0>;
                    reg = <0xff705000 0x1000>,
                          <0xffa00000 0x1000>;
                    interrupts = <0 151 4>;
                    clocks = <&qspi_clk>;
                    cdns,is-decoded-cs;
                    cdns,fifo-depth = <128>;
                    cdns,fifo-width = <4>;
                    cdns,trigger-address = <0x00000000>;
                    resets = <&rst QSPI_RESET>, <&rst QSPI_OCP_RESET>;
                    reset-names = "qspi", "qspi-ocp";
    
                    flash0: n25q00@0 {
                            ...
                            cdns,read-delay = <4>;
                            cdns,tshsl-ns = <50>;
                            cdns,tsd2d-ns = <50>;
                            cdns,tchsh-ns = <4>;
                            cdns,tslch-ns = <4>;
                    };
            };

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