58 lines
2.1 KiB
Plaintext
58 lines
2.1 KiB
Plaintext
VIA VT8500 and Wondermedia WM8xxx-series pinmux/gpio controller
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These SoCs contain a combined Pinmux/GPIO module. Each pin may operate as
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either a GPIO in, GPIO out or as an alternate function (I2C, SPI etc).
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Required properties:
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- compatible: "via,vt8500-pinctrl", "wm,wm8505-pinctrl", "wm,wm8650-pinctrl",
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"wm8750-pinctrl" or "wm,wm8850-pinctrl"
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- reg: Should contain the physical address of the module's registers.
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- interrupt-controller: Marks the device node as an interrupt controller.
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- #interrupt-cells: Should be two.
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- gpio-controller: Marks the device node as a GPIO controller.
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- #gpio-cells : Should be two. The first cell is the pin number and the
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second cell is used to specify optional parameters.
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bit 0 - active low
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Please refer to ../gpio/gpio.txt for a general description of GPIO bindings.
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Please refer to pinctrl-bindings.txt in this directory for details of the
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common pinctrl bindings used by client devices, including the meaning of the
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phrase "pin configuration node".
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Each pin configuration node lists the pin(s) to which it applies, and one or
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more of the mux functions to select on those pin(s), and pull-up/down
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configuration. Each subnode only affects those parameters that are explicitly
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listed. In other words, a subnode that lists only a mux function implies no
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information about any pull configuration. Similarly, a subnode that lists only
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a pull parameter implies no information about the mux function.
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Required subnode-properties:
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- wm,pins: An array of cells. Each cell contains the ID of a pin.
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Optional subnode-properties:
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- wm,function: Integer, containing the function to mux to the pin(s):
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0: GPIO in
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1: GPIO out
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2: alternate
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- wm,pull: Integer, representing the pull-down/up to apply to the pin(s):
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0: none
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1: down
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2: up
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Each of wm,function and wm,pull may contain either a single value which
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will be applied to all pins in wm,pins, or one value for each entry in
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wm,pins.
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Example:
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pinctrl: pinctrl {
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compatible = "wm,wm8505-pinctrl";
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reg = <0xD8110000 0x10000>;
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interrupt-controller;
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#interrupt-cells = <2>;
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gpio-controller;
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#gpio-cells = <2>;
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};
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