ite,it8xxx2-pinctrl

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.

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)