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170c6152 TP |
1 | VIA VT8500 and Wondermedia WM8xxx-series pinmux/gpio controller |
2 | ||
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 function (I2C, SPI etc). | |
5 | ||
6 | Required 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 | ||
17 | Please refer to ../gpio/gpio.txt for a general description of GPIO bindings. | |
18 | ||
19 | Please refer to pinctrl-bindings.txt in this directory for details of the | |
20 | common pinctrl bindings used by client devices, including the meaning of the | |
21 | phrase "pin configuration node". | |
22 | ||
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 pin(s), and pull-up/down | |
25 | configuration. Each subnode only affects those parameters that are explicitly | |
26 | listed. In other words, a subnode that lists only a mux function implies no | |
27 | information about any pull configuration. Similarly, a subnode that lists only | |
28 | a pull parameter implies no information about the mux function. | |
29 | ||
30 | Required subnode-properties: | |
31 | - wm,pins: An array of cells. Each cell contains the ID of a pin. | |
32 | ||
33 | Optional 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 | ||
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 value for each entry in | |
46 | wm,pins. | |
47 | ||
48 | Example: | |
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 | }; |