1 VIA VT8500 and Wondermedia WM8xxx-series pinmu 1 VIA VT8500 and Wondermedia WM8xxx-series pinmux/gpio controller
2 2
3 These SoCs contain a combined Pinmux/GPIO modu 3 These SoCs contain a combined Pinmux/GPIO module. Each pin may operate as
4 either a GPIO in, GPIO out or as an alternate 4 either a GPIO in, GPIO out or as an alternate function (I2C, SPI etc).
5 5
6 Required properties: 6 Required properties:
7 - compatible: "via,vt8500-pinctrl", "wm,wm8505 7 - compatible: "via,vt8500-pinctrl", "wm,wm8505-pinctrl", "wm,wm8650-pinctrl",
8 "wm8750-pinctrl" or "wm,wm8850-pinctrl 8 "wm8750-pinctrl" or "wm,wm8850-pinctrl"
9 - reg: Should contain the physical address of 9 - reg: Should contain the physical address of the module's registers.
10 - interrupt-controller: Marks the device node 10 - interrupt-controller: Marks the device node as an interrupt controller.
11 - #interrupt-cells: Should be two. 11 - #interrupt-cells: Should be two.
12 - gpio-controller: Marks the device node as a 12 - gpio-controller: Marks the device node as a GPIO controller.
13 - #gpio-cells : Should be two. The first cell 13 - #gpio-cells : Should be two. The first cell is the pin number and the
14 second cell is used to specify optional para 14 second cell is used to specify optional parameters.
15 bit 0 - active low 15 bit 0 - active low
16 16
17 Please refer to ../gpio/gpio.txt for a general 17 Please refer to ../gpio/gpio.txt for a general description of GPIO bindings.
18 18
19 Please refer to pinctrl-bindings.txt in this d 19 Please refer to pinctrl-bindings.txt in this directory for details of the
20 common pinctrl bindings used by client devices 20 common pinctrl bindings used by client devices, including the meaning of the
21 phrase "pin configuration node". 21 phrase "pin configuration node".
22 22
23 Each pin configuration node lists the pin(s) t 23 Each pin configuration node lists the pin(s) to which it applies, and one or
24 more of the mux functions to select on those p 24 more of the mux functions to select on those pin(s), and pull-up/down
25 configuration. Each subnode only affects those 25 configuration. Each subnode only affects those parameters that are explicitly
26 listed. In other words, a subnode that lists o 26 listed. In other words, a subnode that lists only a mux function implies no
27 information about any pull configuration. Simi 27 information about any pull configuration. Similarly, a subnode that lists only
28 a pull parameter implies no information about 28 a pull parameter implies no information about the mux function.
29 29
30 Required subnode-properties: 30 Required subnode-properties:
31 - wm,pins: An array of cells. Each cell contai 31 - wm,pins: An array of cells. Each cell contains the ID of a pin.
32 32
33 Optional subnode-properties: 33 Optional subnode-properties:
34 - wm,function: Integer, containing the functio 34 - wm,function: Integer, containing the function to mux to the pin(s):
35 0: GPIO in 35 0: GPIO in
36 1: GPIO out 36 1: GPIO out
37 2: alternate 37 2: alternate
38 38
39 - wm,pull: Integer, representing the pull-down 39 - wm,pull: Integer, representing the pull-down/up to apply to the pin(s):
40 0: none 40 0: none
41 1: down 41 1: down
42 2: up 42 2: up
43 43
44 Each of wm,function and wm,pull may contain ei 44 Each of wm,function and wm,pull may contain either a single value which
45 will be applied to all pins in wm,pins, or one 45 will be applied to all pins in wm,pins, or one value for each entry in
46 wm,pins. 46 wm,pins.
47 47
48 Example: 48 Example:
49 49
50 pinctrl: pinctrl { 50 pinctrl: pinctrl {
51 compatible = "wm,wm8505-pinctr 51 compatible = "wm,wm8505-pinctrl";
52 reg = <0xD8110000 0x10000>; 52 reg = <0xD8110000 0x10000>;
53 interrupt-controller; 53 interrupt-controller;
54 #interrupt-cells = <2>; 54 #interrupt-cells = <2>;
55 gpio-controller; 55 gpio-controller;
56 #gpio-cells = <2>; 56 #gpio-cells = <2>;
57 }; 57 };
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