nuvoton,npcx-pinctrl¶
Vendor: Nuvoton Technology Corporation
Description¶
The Nuvoton pin controller is a singleton node responsible for controlling
pin function selection and pin properties. For example, you can use these
nodes to select peripheral pin functions.
Here is a list of supported standard pin properties:
- bias-pull-down: Enable pull-down resistor.
- bias-pull-up: Enable pull-up resistor.
- drive-open-drain: Output driver is open-drain.
Custom pin properties for npcx series are available also:
- pinmux-locked: Lock pinmux configuration for peripheral device
- pinmux-gpio: Inverse pinmux back to gpio
An example for NPCX7 family, include the chip level pinctrl DTSI file in the
board level DTS:
#include <nuvoton/npcx/npcx7/npcx7-pinctrl.dtsi>
We want to use the I2C0_0 port of the NPCX7M6FB controller and enable the
internal 3.3V pull-up if its i2c frequency won't exceed 400kHz.
To change a pin's pinctrl default properties, add a reference to the
pin in the board's DTS file and set the properties as below:
&i2c0_0_sda_scl_gpb4_b5 {
bias-pull-up; /* Enable internal pull-up for i2c0_0 */
pinmux-locked; /* Lock pinmuxing */
};
&i2c0_0 {
pinctrl-0 = <&i2c0_0_sda_scl_gpb4_b5>;
pinctrl-names = "default";
}
Properties¶
Top level properties¶
These property descriptions apply to “nuvoton,npcx-pinctrl” nodes themselves. This page also describes child node properties in the following sections.
Properties not inherited from the base binding file.
(None)
Deprecated properties not inherited from the base binding file.
(None)
Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “nuvoton,npcx-pinctrl” compatible.
Name |
Type |
Details |
|---|---|---|
|
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indicates the operational status of a device
Legal values: See Important properties for more information. |
|
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compatible strings
This property is required. See Important properties for more information. |
|
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register space
See Important properties for more information. |
|
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name of each register space
|
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interrupts for device
See Important properties for more information. |
|
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extended interrupt specifier for device
|
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name of each interrupt
|
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phandle to interrupt controller node
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Human readable string describing the device (used as device_get_binding() argument)
See Important properties for more information. |
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Clock gate information
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name of each clock
|
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number of address cells in reg property
|
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number of size cells in reg property
|
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DMA channels specifiers
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Provided names of DMA channel specifiers
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IO channels specifiers
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Provided names of IO channel specifiers
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mailbox / IPM channels specifiers
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Provided names of mailbox / IPM channel specifiers
|
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Property to identify that a device can be used as wake up source.
When this property is provided a specific flag is set into the
device that tells the system that the device is capable of
wake up the system.
Wake up capable devices are disabled (interruptions will not wake up
the system) by default but they can be enabled at runtime if necessary.
|
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Power domain the device belongs to.
The device will be notified when the power domain it belongs to is either
suspended or resumed.
|
Child node properties¶
Name |
Type |
Details |
|---|---|---|
|
|
Configurations of pinmux selection
|
|
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A map to PUPD_ENn register/bit that enable pull-up/down of NPCX peripheral devices.
Please don't overwrite this property in the board-level DT driver.
|
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Lock pinmux selection
|
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Inverse pinmux selection to GPIO
|
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enable pull-up resistor
|
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enable pull-down resistor
|
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drive with open drain (hardware AND)
|