The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/gpio/gpio-74xx-mmio.txt

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    1 * 74XX MMIO GPIO driver
    2 
    3 Required properties:
    4 - compatible: Should contain one of the following:
    5    "ti,741g125": for 741G125 (1-bit Input),
    6    "ti,741g174": for 741G74 (1-bit Output),
    7    "ti,742g125": for 742G125 (2-bit Input),
    8    "ti,7474"   : for 7474 (2-bit Output),
    9    "ti,74125"  : for 74125 (4-bit Input),
   10    "ti,74175"  : for 74175 (4-bit Output),
   11    "ti,74365"  : for 74365 (6-bit Input),
   12    "ti,74174"  : for 74174 (6-bit Output),
   13    "ti,74244"  : for 74244 (8-bit Input),
   14    "ti,74273"  : for 74273 (8-bit Output),
   15    "ti,741624" : for 741624 (16-bit Input),
   16    "ti,7416374": for 7416374 (16-bit Output).
   17 - reg: Physical base address and length where IC resides.
   18 - gpio-controller: Marks the device node as a gpio controller.
   19 - #gpio-cells: Should be two. The first cell is the pin number and
   20    the second cell is used to specify the GPIO polarity:
   21     0 = Active High,
   22     1 = Active Low.
   23 
   24 Example:
   25         ctrl: gpio@30008004 {
   26                 compatible = "ti,74174";
   27                 reg = <0x30008004 0x1>;
   28                 gpio-controller;
   29                 #gpio-cells = <2>;
   30         };

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