bindings-gpio.txt

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    1 $FreeBSD: releng/11.2/sys/boot/fdt/dts/bindings-gpio.txt 261516 2014-02-05 17:08:55Z loos $
    2 
    3 GPIO configuration.
    4 ===================
    5 
    6 1. Properties for GPIO Controllers
    7 
    8 1.1 #gpio-cells
    9 
   10 Property:       #gpio-cells
   11 
   12 Value type:     <u32>
   13 
   14 Description:    The #gpio-cells property defines the number of cells required
   15                 to encode a gpio specifier.
   16 
   17 
   18 1.2 gpio-controller
   19 
   20 Property:       gpio-controller
   21 
   22 Value type:     <empty>
   23 
   24 Description:    The presence of a gpio-controller property defines a node as a
   25                 GPIO controller node.
   26 
   27 
   28 1.3 pin-count
   29 
   30 Property:       pin-count
   31 
   32 Value type:     <u32>
   33 
   34 Description:    The pin-count property defines the number of GPIO pins.
   35 
   36 
   37 1.4 Example
   38 
   39         GPIO: gpio@10100 {
   40                 #gpio-cells = <3>;
   41                 compatible = "mrvl,gpio";
   42                 reg = <0x10100 0x20>;
   43                 gpio-controller;
   44                 interrupts = <6 7 8 9>;
   45                 interrupt-parent = <&PIC>;
   46                 pin-count = <50>
   47         };
   48 
   49 2. Properties for GPIO consumer nodes.
   50 
   51 2.1 gpios
   52 
   53 Property:       gpios
   54 
   55 Value type:     <prop-encoded-array> encoded as arbitrary number of GPIO
   56                 specifiers.
   57 
   58 Description:    The gpios property of a device node defines the GPIO or GPIOs
   59                 that are used by the device. The value of the gpios property
   60                 consists of an arbitrary number of GPIO specifiers.
   61                 
   62                 The first cell of the GPIO specifier is phandle of the node's
   63                 parent GPIO controller and remaining cells are defined by the
   64                 binding describing the GPIO parent, typically include
   65                 information like pin number, direction and various flags.
   66 
   67 Example:
   68                 gpios = <&GPIO 0 1 0            /* GPIO[0]:  IN,  NONE */
   69                          &GPIO 1 2 0>;          /* GPIO[1]:  OUT, NONE */
   70 
   71 
   72 3. "mrvl,gpio" controller GPIO specifier
   73 
   74         <phandle pin dir flags>
   75 
   76 
   77 pin:    0-MAX                           GPIO pin number.
   78 
   79 dir:
   80         1               IN              Input direction.
   81         2               OUT             Output direction.
   82 
   83 flags:
   84         0x0000----      IN_NONE
   85         0x0001----      IN_POL_LOW      Polarity low (active-low).
   86         0x0002----      IN_IRQ_EDGE     Interrupt, edge triggered.
   87         0x0004----      IN_IRQ_LEVEL    Interrupt, level triggered.
   88         
   89         0x----0000      OUT_NONE
   90         0x----0001      OUT_BLINK       Blink on the pin.
   91         0x----0002      OUT_OPEN_DRAIN  Open drain output line.
   92         0x----0004      OUT_OPEN_SRC    Open source output line.
   93 
   94 
   95 Example:
   96         gpios = <&GPIO 0  1 0x00000000          /* GPIO[0]:   IN */
   97                  &GPIO 1  2 0x00000000          /* GPIO[1]:   OUT */
   98                  &GPIO 2  1 0x00020000          /* GPIO[2]:   IN, IRQ (edge) */
   99                  &GPIO 3  1 0x00040000          /* GPIO[3]:   IN, IRQ (level) */
  100                  ...
  101                  &GPIO 10 2 0x00000001>;        /* GPIO[10]:  OUT, blink */

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FreeBSD/Linux Kernel Cross Reference sys/boot/fdt/dts/bindings-gpio.txt

FreeBSD/Linux Kernel Cross Reference
sys/boot/fdt/dts/bindings-gpio.txt