FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/gpio/gpio-ts4900.txt

     * Technologic Systems I2C-FPGA's GPIO controller bindings
     
     This bindings describes the GPIO controller for Technologic's FPGA core.
     TS-4900's FPGA encodes the GPIO state on 3 bits, whereas the TS-7970's FPGA
     uses 2 bits: it doesn't use a dedicated input bit.
     
     Required properties:
     - compatible: Should be one of the following
                     "technologic,ts4900-gpio"
                    "technologic,ts7970-gpio"
    - reg: Physical base address of the controller and length
           of memory mapped region.
    - #gpio-cells: Should be two. The first cell is the pin number.
    - gpio-controller: Marks the device node as a gpio controller.
    
    Optional property:
    - ngpios: Number of GPIOs this controller is instantiated with,
      the default is 32. See gpio.txt for more details.
    
    Example:
    
    &i2c2 {
            gpio8: gpio@28 {
                    compatible = "technologic,ts4900-gpio";
                    reg = <0x28>;
                    #gpio-cells = <2>;
                    gpio-controller;
                    ngpios = <32>;
            };
    };

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