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Vendor: Renesas Electronics Corporation


Renesas R-Car Pin Function Controller node
This binding gives a base representation of the R-Car pins configuration.
The R-Car pin controller is a singleton node responsible for controlling
pin function selection and pin properties. For example, you can use this
node to route CAN0 TX A to pin 'RD', and enable pull-up resistor as well
as driving ability.

The node has the 'pfc' node label set in your SoC's devicetree, so you can
modify it like this:

&pfc {
     /* your modifications go here */

All device pin configurations should be placed in child nodes of the
'pfc' 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/renesas/pinctrl-r8a77951.h>

  &pfc {
    /* configuration for can0 data a tx default state */
    can0_data_a_tx_default: can0_data_a_tx_default {
      /* configure PIN_RD as FUNC_CAN0_TX_A */
      pin = <PIN_RD FUNC_CAN0_TX_A>;
    /* configuration for can0 data a rx default state */
    can0_data_a_rx_default: can0_data_a_rx_default {
      /* configure PIN_RD_WR as FUNC_CAN0_RX_A */
      pin = <PIN_RD_WR FUNC_CAN0_RX_A>;

The 'can0_data_a_tx_default' child node encodes the pin configurations
for a particular state of a device; in this case, the default
(that is, active) state. You would specify the low-power configuration for
the same device in a separate child node.

A pin configuration can also specify pin properties such as the
'bias-pull-up' property. Here is a list of supported standard pin

- bias-disable
- bias-pull-down
- bias-pull-up
- drive-strength
- power-source

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"

  &can0 {
    pinctrl-0 = <&can0_data_a_tx_default &can0_data_a_rx_default>;
    pinctrl-1 = <&can0_data_a_tx_sleep &can0_data_a_rx_sleep>;
    pinctrl-names = "default", "sleep";


Top level properties

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

Properties not inherited from the base binding file.


Child node properties






The array is expected to have up to two elements. The first element is
the pin the second optional element is the pin function.

This property is required.



maximum sink or source current in mA

Legal values: 3, 6, 9, 12, 15, 18, 21, 24



disable any pin bias



enable pull-up resistor



enable pull-down resistor



select between different power supplies