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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) sate.

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.

Node specific properties

Deprecated node specific properties

Base properties

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

status

string

 
indicates the operational status of a device

Legal values: 'ok', 'okay', 'disabled', 'reserved', 'fail', 'fail-sss'

See Important properties for more information.

compatible

string-array

 
compatible strings

This property is required.

See Important properties for more information.

reg

array

 
register space

See Important properties for more information.

reg-names

string-array

 
name of each register space

interrupts

array

 
interrupts for device

See Important properties for more information.

interrupts-extended

compound

 
extended interrupt specifier for device

interrupt-names

string-array

 
name of each interrupt

interrupt-parent

phandle

 
phandle to interrupt controller node

label

string

 
Human readable string describing the device (used as device_get_binding() argument)

See Important properties for more information.

clocks

phandle-array

 
Clock gate information

clock-names

string-array

 
name of each clock

#address-cells

int

 
number of address cells in reg property

#size-cells

int

 
number of size cells in reg property

dmas

phandle-array

 
DMA channels specifiers

dma-names

string-array

 
Provided names of DMA channel specifiers

io-channels

phandle-array

 
IO channels specifiers

io-channel-names

string-array

 
Provided names of IO channel specifiers

mboxes

phandle-array

 
mailbox / IPM channels specifiers

mbox-names

string-array

 
Provided names of mailbox / IPM channel specifiers

wakeup-source

boolean

 
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

phandle

 
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

pinmuxs

phandle-array

 
ITE IT8XXX2 pin's configuration (pinctrl node, pin and function).

This property is required.

gpio-voltage

string

 
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

Default value: 3v3

Legal values: '3v3', '1v8'

bias-high-impedance

boolean

 
high impedance mode ("third-state", "floating")

bias-pull-up

boolean

 
enable pull-up resistor

bias-pull-down

boolean

 
enable pull-down resistor

bias-pull-pin-default

boolean

 
use pin's default pull state

input-enable

boolean

 
enable input on pin (no effect on output, such as enabling an input
buffer)