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.

Node specific properties

Properties not inherited from the base binding file.

(None)

Deprecated node specific properties

Deprecated properties not inherited from the base binding file.

(None)

Base properties

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. This property is deprecated.
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
power-domains	phandle-array	Power domain specifiers
power-domain-names	string-array	Provided names of power domain specifiers
#power-domain-cells	int	Number of cells in power-domains property
zephyr,deferred-init	boolean	Do not initialize device automatically on boot. Device should be manually initialized using device_init().
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.
zephyr,pm-device-runtime-auto	boolean	Automatically configure the device for runtime power management after the init function runs.
zephyr,disabling-power-states	phandles	List of power states that will disable this device power.

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. kSI[7:0] and KSO[15:0] pins only support 3.3V. Default value: 3v3 Legal values: '3v3', '1v8'
drive-strength	string	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: 'high', 'low'
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
drive-push-pull	boolean	drive actively high and low
drive-open-drain	boolean	drive with open drain (hardware AND)
input-enable	boolean	enable input on pin (e.g. enable an input buffer, no effect on output)