FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/pinctrl/brcm,bcm2835-gpio.txt

     Broadcom BCM2835 GPIO (and pinmux) controller
     
     The BCM2835 GPIO module is a combined GPIO controller, (GPIO) interrupt
     controller, and pinmux/control device.
     
     Required properties:
     - compatible: "brcm,bcm2835-gpio"
     - compatible: should be one of:
       "brcm,bcm2835-gpio" - BCM2835 compatible pinctrl
      "brcm,bcm7211-gpio" - BCM7211 compatible pinctrl
      "brcm,bcm2711-gpio" - BCM2711 compatible pinctrl
      "brcm,bcm7211-gpio" - BCM7211 compatible pinctrl
    - reg: Should contain the physical address of the GPIO module's registers.
    - gpio-controller: Marks the device node as a GPIO controller.
    - #gpio-cells : Should be two. The first cell is the pin number and the
      second cell is used to specify optional parameters:
      - bit 0 specifies polarity (0 for normal, 1 for inverted)
    - interrupts : The interrupt outputs from the controller. One interrupt per
      individual bank followed by the "all banks" interrupt. For BCM7211, an
      additional set of per-bank interrupt line and an "all banks" wake-up
      interrupt may be specified.
    - interrupt-controller: Marks the device node as an interrupt controller.
    - #interrupt-cells : Should be 2.
      The first cell is the GPIO number.
      The second cell is used to specify flags:
        bits[3:0] trigger type and level flags:
          1 = low-to-high edge triggered.
          2 = high-to-low edge triggered.
          4 = active high level-sensitive.
          8 = active low level-sensitive.
        Valid combinations are 1, 2, 3, 4, 8.
    
    Please refer to ../gpio/gpio.txt for a general description of GPIO bindings.
    
    Please refer to pinctrl-bindings.txt in this directory for details of the
    common pinctrl bindings used by client devices, including the meaning of the
    phrase "pin configuration node".
    
    Each pin configuration node lists the pin(s) to which it applies, and one or
    more of the mux function to select on those pin(s), and pull-up/down
    configuration. Each subnode only affects those parameters that are explicitly
    listed. In other words, a subnode that lists only a mux function implies no
    information about any pull configuration. Similarly, a subnode that lists only
    a pul parameter implies no information about the mux function.
    
    The BCM2835 pin configuration and multiplexing supports the generic bindings.
    For details on each properties, you can refer to ./pinctrl-bindings.txt.
    
    Required sub-node properties:
      - pins
      - function
    
    Optional sub-node properties:
      - bias-disable
      - bias-pull-up
      - bias-pull-down
      - output-high
      - output-low
    
    Legacy pin configuration and multiplexing binding:
    *** (Its use is deprecated, use generic multiplexing and configuration
    bindings instead)
    
    Required subnode-properties:
    - brcm,pins: An array of cells. Each cell contains the ID of a pin. Valid IDs
      are the integer GPIO IDs; 0==GPIO0, 1==GPIO1, ... 53==GPIO53.
    
    Optional subnode-properties:
    - brcm,function: Integer, containing the function to mux to the pin(s):
      0: GPIO in
      1: GPIO out
      2: alt5
      3: alt4
      4: alt0
      5: alt1
      6: alt2
      7: alt3
    - brcm,pull: Integer, representing the pull-down/up to apply to the pin(s):
      0: none
      1: down
      2: up
    
    Each of brcm,function and brcm,pull may contain either a single value which
    will be applied to all pins in brcm,pins, or 1 value for each entry in
    brcm,pins.
    
    Example:
    
            gpio: gpio {
                    compatible = "brcm,bcm2835-gpio";
                    reg = <0x2200000 0xb4>;
                    interrupts = <2 17>, <2 19>, <2 18>, <2 20>;
    
                    gpio-controller;
                    #gpio-cells = <2>;
    
                    interrupt-controller;
                    #interrupt-cells = <2>;
            };

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