ite,it8xxx2-pinctrl
Vendor: ITE Tech. Inc.
Description
The ITE IT8XXX2 pin controller is a node responsible for controlling
pin function selection and pin properties. For example, you can
use this node to route UART1 RX and TX setting the alternate
function on the pin.
The node has the 'pinctrl' node label set in your SoC's devicetree,
so you can modify it like this:
&pinctrl {
/* your modifications go here */
};
All device pin configurations should be placed in child nodes of the
'pinctrl' node, as shown in this example:
/* You can put this in places like a board-pinctrl.dtsi file in
* your board directory, or a devicetree overlay in your application.
*/
/* include pre-defined pins and functions for the SoC used by the board */
#include <dt-bindings/pinctrl/it8xxx2-pinctrl.h>
&pinctrl {
/* configuration for I2C0 default state */
i2c0_clk_pb3_default: i2c0_clk_pb3_default {
pinmuxs = <&pinctrlb 3 IT8XXX2_ALT_FUNC_1>;
gpio-voltage = "1p8";
};
i2c0_data_pb4_default: i2c0_data_pb4_default {
pinmuxs = <&pinctrlb 4 IT8XXX2_ALT_FUNC_1>;
gpio-voltage = "1v8";
};
/* configuration for UART0 default state */
uart1_rx_pb0_default: uart1_rx_pb0_default {
pinmuxs = <&pinctrlb 0 IT8XXX2_ALT_FUNC_3>;
bias-pull-up;
};
uart1_tx_pb1_default: uart1_tx_pb1_default {
pinmuxs = <&pinctrlb 1 IT8XXX2_ALT_FUNC_3>;
};
};
The 'uart1_rx_pb0_default' child node encodes the pin configurations
for a particular state of a device; in this case, the default
(that is, active) state.
To link pin configurations with a device, use a pinctrl-N property for some
number N, like this example you could place in your board's DTS file:
#include "board-pinctrl.dtsi"
&uart0 {
pinctrl-0 = <&uart1_rx_pb0_default &uart1_tx_pb1_default>;
pinctrl-1 = <&uart1_rx_pb0_sleep &uart1_tx_pb1_sleep>;
pinctrl-names = "default", "sleep";
};
Properties
Top level properties
These property descriptions apply to “ite,it8xxx2-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 “ite,it8xxx2-pinctrl” compatible.
Name |
Type |
Details |
|---|---|---|
|
|
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.
|
|
|
Power domain the device belongs to.
The device will be notified when the power domain it belongs to is either
suspended or resumed.
|
|
|
Automatically configure the device for runtime power management after the
init function runs.
|
|
|
List of power states that will disable this device power.
|
|
|
indicates the operational status of a device
Legal values: See Important properties for more information. |
|
|
compatible strings
This property is required. See Important properties for more information. |
|
|
register space
See Important properties for more information. |
|
|
name of each register space
|
|
|
interrupts for device
See Important properties for more information. |
|
|
extended interrupt specifier for device
|
|
|
name of each interrupt
|
|
|
phandle to interrupt controller node
|
|
|
Human readable string describing the device (used as device_get_binding() argument)
See Important properties for more information. This property is deprecated. |
|
|
Clock gate information
|
|
|
name of each clock
|
|
|
number of address cells in reg property
|
|
|
number of size cells in reg property
|
|
|
DMA channels specifiers
|
|
|
Provided names of DMA channel specifiers
|
|
|
IO channels specifiers
|
|
|
Provided names of IO channel specifiers
|
|
|
mailbox / IPM channels specifiers
|
|
|
Provided names of mailbox / IPM channel specifiers
|
|
|
Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
|
Child node properties
Name |
Type |
Details |
|---|---|---|
|
|
high impedance mode ("third-state", "floating")
|
|
|
enable pull-up resistor
|
|
|
enable pull-down resistor
|
|
|
use pin's default pull state
|
|
|
drive actively high and low
|
|
|
drive with open drain (hardware AND)
|
|
|
enable input on pin (e.g. enable an input buffer, no effect on output)
|
|
|
ITE IT8XXX2 pin's configuration (pinctrl node, pin and function).
This property is required. |
|
|
Pin input voltage selection 3.3V or 1.8V. All gpio pins support 3.3V.
This property only needs to be configured if the board specifies a
pin as 1.8V. So the default is 3.3V.
kSI[7:0] and KSO[15:0] pins only support 3.3V.
Default value: Legal values: |
|
|
We can configure this property to drive a high or low current selection.
If this property is not configured, it is the default setting.
According to the SPEC, the default drive current selection varies from
different pins.
Define the high level 0b: 8mA
low level 1b: 4mA or 2mA
Legal values: |