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renesas,rcar-pfc

Vendor: Renesas Electronics Corporation

Description

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) sate. 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
properties:

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

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";
  };

Properties

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.

(None)

Deprecated 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 “renesas,rcar-pfc” compatible.

Name

Type

Details

reg

array

register space

This property is required.

See Important properties for more information.

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-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

pin

array

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.

drive-strength

int

maximum sink or source current in mA

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

bias-disable

boolean

disable any pin bias

bias-pull-up

boolean

enable pull-up resistor

bias-pull-down

boolean

enable pull-down resistor