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138 lines
3.5 KiB
138 lines
3.5 KiB
Qualcomm Technologies, Inc. WCD GPIO block
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This binding describes the GPIO block found in the WCD934X series of
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audio codec's from QTI.
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- compatible:
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Usage: required
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Value type: <string>
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Definition: must be "qcom,wcd-pinctrl"
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- qcom,num-gpios:
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Usage: required
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Value type: <u32>
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Definition: Number of GPIO's supported by the controller
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- gpio-controller:
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Usage: required
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Value type: <none>
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Definition: Mark the device node as a GPIO controller
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- #gpio-cells:
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Usage: required
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Value type: <u32>
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Definition: Must be 2;
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the first cell will be used to define gpio number and the
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second denotes the flags for this gpio
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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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The pin configuration nodes act as a container for an arbitrary number of
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subnodes. Each of these subnodes represents some desired configuration for a
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pin or a list of pins. This configuration can include the
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mux function to select on those pin(s), and various pin configuration
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parameters, as listed below.
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SUBNODES:
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The name of each subnode is not important; all subnodes should be enumerated
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and processed purely based on their content.
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Each subnode only affects those parameters that are explicitly listed. In
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other words, a subnode that lists a mux function but no pin configuration
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parameters implies no information about any pin configuration parameters.
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Similarly, a pin subnode that describes a pullup parameter implies no
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information about e.g. the mux function.
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The following generic properties as defined in pinctrl-bindings.txt are valid
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to specify in a pin configuration subnode:
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- pins:
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Usage: required
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Value type: <string-array>
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Definition: List of gpio pins affected by the properties specified in
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this subnode. Valid pins are:
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gpio1-gpio5 for wcd9360
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- bias-disable:
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Usage: optional
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Value type: <none>
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Definition: The specified pins should be configured as no pull.
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- bias-pull-down:
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Usage: optional
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Value type: <none>
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Definition: The specified pins should be configured as pull down.
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- bias-pull-up:
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Usage: optional
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Value type: <empty>
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Definition: The specified pins should be configured as pull up.
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- qcom,pull-up-strength:
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Usage: optional
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Value type: <u32>
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Definition: Specifies the strength to use for pull up, if selected.
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- bias-high-impedance:
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Usage: optional
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Value type: <none>
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Definition: The specified pins will put in high-Z mode and disabled.
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- input-enable:
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Usage: optional
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Value type: <none>
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Definition: The specified pins are put in input mode.
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- output-high:
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Usage: optional
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Value type: <none>
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Definition: The specified pins are configured in output mode, driven
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high.
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- output-low:
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Usage: optional
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Value type: <none>
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Definition: The specified pins are configured in output mode, driven
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low.
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- qcom,drive-strength:
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Usage: optional
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Value type: <u32>
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Definition: Selects the drive strength for the specified pins.
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Example:
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wcd: wcd_pinctrl@5 {
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compatible = "qcom,wcd-pinctl";
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qcom,num-gpios = <5>;
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gpio-controller;
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#gpio-cells = <2>;
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spkr_1_wcd_en_active: spkr_1_wcd_en_active {
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mux {
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pins = "gpio2";
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};
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config {
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pins = "gpio2";
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output-high;
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};
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};
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spkr_1_wcd_en_sleep: spkr_1_wcd_en_sleep {
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mux {
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pins = "gpio2";
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};
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config {
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pins = "gpio2";
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input-enable;
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};
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};
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};
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