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