FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/spi/qcom,spi-geni-qcom.txt

     GENI based Qualcomm Universal Peripheral (QUP) Serial Peripheral Interface (SPI)
     
     The QUP v3 core is a GENI based AHB slave that provides a common data path
     (an output FIFO and an input FIFO) for serial peripheral interface (SPI)
     mini-core.
     
     SPI in master mode supports up to 50MHz, up to four chip selects, programmable
     data path from 4 bits to 32 bits and numerous protocol variants.
     
    Required properties:
    - compatible:           Must contain "qcom,geni-spi".
    - reg:                  Must contain SPI register location and length.
    - interrupts:           Must contain SPI controller interrupts.
    - clock-names:          Must contain "se".
    - clocks:               Serial engine core clock needed by the device.
    - #address-cells:       Must be <1> to define a chip select address on
                            the SPI bus.
    - #size-cells:          Must be <0>.
    
    SPI Controller nodes must be child of GENI based Qualcomm Universal
    Peripharal. Please refer GENI based QUP wrapper controller node bindings
    described in Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.yaml.
    
    SPI slave nodes must be children of the SPI master node and conform to SPI bus
    binding as described in Documentation/devicetree/bindings/spi/spi-bus.txt.
    
    Example:
            spi0: spi@a84000 {
                    compatible = "qcom,geni-spi";
                    reg = <0xa84000 0x4000>;
                    interrupts = <GIC_SPI 354 IRQ_TYPE_LEVEL_HIGH>;
                    clock-names = "se";
                    clocks = <&clock_gcc GCC_QUPV3_WRAP0_S0_CLK>;
                    pinctrl-names = "default", "sleep";
                    pinctrl-0 = <&qup_1_spi_2_active>;
                    pinctrl-1 = <&qup_1_spi_2_sleep>;
                    #address-cells = <1>;
                    #size-cells = <0>;
            };

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