Documentation/devicetree/bindings/gpio/gpio-74xx-mmio.txt

   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         };