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renesas,rzt2m-pinctrl

Vendor: Renesas Electronics Corporation

Description

The Renesas RZ/T2M pin controller is a node responsible for controlling
pin function selection and pin properties, such as routing the TX and RX of UART0
to pin 5 and pin 6 of port 16.

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 combinations for the SoC variant used by the board */
  #include <dt-bindings/pinctrl/renesas-rzt2m-pinctrl.h>

  &pinctrl {
    uart0_default: uart0_default {
      group1 {
        pinmux = <UART0TX_P16_5>;
      };
      group2 {
        pinmux = <UART0RX_P16_6>;
        input-enable;
      };
    };
  };

The 'uart0_default' child node encodes the pin configurations for a
particular state of a device; in this case, the default (that is, active)
state.

As shown, pin configurations are organized in groups within each child node.
Each group can specify a list of pin function selections in the 'pinmux'
property.

A group can also specify shared pin properties common to all the specified
pins, such as the 'input-enable' property in group 2.

Properties

Top level properties

These property descriptions apply to “renesas,rzt2m-pinctrl” nodes themselves. This page also describes child node properties in the following sections.

Properties not inherited from the base binding file.

(None)

Grandchild node properties

Name

Type

Details

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

input-enable

boolean

enable input on pin (e.g. enable an input buffer, no effect on output)

input-schmitt-enable

boolean

enable schmitt-trigger mode

pinmux

array

An array of pins sharing the same group properties. Each
element of the array is an integer constructed from the
pin number and the alternative function of the pin.

This property is required.

drive-strength

string

The drive strength of a pin, relative to full-driver strength.
The default value is "low", which is the reset value.

Default value: low

Legal values: 'low', 'middle', 'high', 'ultrahigh'

slew-rate

string

Select slew rate for a pin. The default is slow, which is the reset value.

Default value: slow

Legal values: 'slow', 'fast'