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.

Node specific propertiesDeprecated node specific propertiesBase properties

Properties not inherited from the base binding file.

(None)

Grandchild node properties

Name	Type	Details
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'
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