linux/Documentation/devicetree/bindings/pinctrl/pinctrl-vt8500.txt
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   1VIA VT8500 and Wondermedia WM8xxx-series pinmux/gpio controller
   2
   3These SoCs contain a combined Pinmux/GPIO module. Each pin may operate as
   4either a GPIO in, GPIO out or as an alternate function (I2C, SPI etc).
   5
   6Required properties:
   7- compatible: "via,vt8500-pinctrl", "wm,wm8505-pinctrl", "wm,wm8650-pinctrl",
   8        "wm8750-pinctrl" or "wm,wm8850-pinctrl"
   9- reg: Should contain the physical address of the module's registers.
  10- interrupt-controller: Marks the device node as an interrupt controller.
  11- #interrupt-cells: Should be two.
  12- gpio-controller: Marks the device node as a GPIO controller.
  13- #gpio-cells : Should be two. The first cell is the pin number and the
  14  second cell is used to specify optional parameters.
  15        bit 0 - active low
  16
  17Please refer to ../gpio/gpio.txt for a general description of GPIO bindings.
  18
  19Please refer to pinctrl-bindings.txt in this directory for details of the
  20common pinctrl bindings used by client devices, including the meaning of the
  21phrase "pin configuration node".
  22
  23Each pin configuration node lists the pin(s) to which it applies, and one or
  24more of the mux functions to select on those pin(s), and pull-up/down
  25configuration. Each subnode only affects those parameters that are explicitly
  26listed. In other words, a subnode that lists only a mux function implies no
  27information about any pull configuration. Similarly, a subnode that lists only
  28a pull parameter implies no information about the mux function.
  29
  30Required subnode-properties:
  31- wm,pins: An array of cells. Each cell contains the ID of a pin.
  32
  33Optional subnode-properties:
  34- wm,function: Integer, containing the function to mux to the pin(s):
  35  0: GPIO in
  36  1: GPIO out
  37  2: alternate
  38
  39- wm,pull: Integer, representing the pull-down/up to apply to the pin(s):
  40  0: none
  41  1: down
  42  2: up
  43
  44Each of wm,function and wm,pull may contain either a single value which
  45will be applied to all pins in wm,pins, or one value for each entry in
  46wm,pins.
  47
  48Example:
  49
  50        pinctrl: pinctrl {
  51                compatible = "wm,wm8505-pinctrl";
  52                reg = <0xD8110000 0x10000>;
  53                interrupt-controller;
  54                #interrupt-cells = <2>;
  55                gpio-controller;
  56                #gpio-cells = <2>;
  57        };
  58