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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
title: Renesas RZ/A1 combined Pin and GPIO controller
- Jacopo Mondi <>
- Geert Uytterhoeven <>
The Renesas SoCs of the RZ/A1 family feature a combined Pin and GPIO
controller, named "Ports" in the hardware reference manual.
Pin multiplexing and GPIO configuration is performed on a per-pin basis
writing configuration values to per-port register sets.
Each "port" features up to 16 pins, each of them configurable for GPIO
function (port mode) or in alternate function mode.
Up to 8 different alternate function modes exist for each single pin.
- const: renesas,r7s72100-ports # RZ/A1H
- items:
- const: renesas,r7s72101-ports # RZ/A1M
- const: renesas,r7s72100-ports # fallback
- const: renesas,r7s72102-ports # RZ/A1L
maxItems: 1
- compatible
- reg
type: object
Each port of the r7s72100 pin controller hardware is itself a GPIO
Different SoCs have different numbers of available pins per port, but
generally speaking, each of them can be configured in GPIO ("port") mode
on this hardware.
Describe GPIO controllers using sub-nodes with the following properties.
gpio-controller: true
const: 2
maxItems: 1
- gpio-controller
- '#gpio-cells'
- gpio-ranges
- type: object
- $ref: pincfg-node.yaml#
- $ref: pinmux-node.yaml#
A pin multiplexing sub-node describes how to configure a set of (or a
single) pin in some desired alternate function mode.
A single sub-node may define several pin configurations.
A few alternate function require special pin configuration flags to be
supplied along with the alternate function configuration number.
The hardware reference manual specifies when a pin function requires
"software IO driven" mode to be specified. To do so use the generic
properties from the <include/linux/pinctrl/pinconf_generic.h> header
file to instruct the pin controller to perform the desired pin
configuration operation.
The hardware reference manual specifies when a pin has to be configured
to work in bi-directional mode and when the IO direction has to be
specified by software. Bi-directional pins must be managed by the pin
controller driver internally, while software driven IO direction has to
be explicitly selected when multiple options are available.
description: |
Integer array representing pin number and pin multiplexing
When a pin has to be configured in alternate function mode, use
this property to identify the pin by its global index, and provide
its alternate function configuration number along with it.
When multiple pins are required to be configured as part of the
same alternate function they shall be specified as members of the
same argument list of a single "pinmux" property.
Helper macros to ease assembling the pin index from its position
(port where it sits on and pin number) and alternate function
identifier are provided by the pin controller header file at:
Integers values in "pinmux" argument list are assembled as:
((PORT * 16 + PIN) | MUX_FUNC << 16)
phandle: true
input-enable: true
output-enable: true
- pinmux
additionalProperties: false
- type: object
phandle: true
$ref: "#/additionalProperties/anyOf/0"
- |
#include <dt-bindings/pinctrl/r7s72100-pinctrl.h>
pinctrl: pinctrl@fcfe3000 {
compatible = "renesas,r7s72100-ports";
reg = <0xfcfe3000 0x4230>;
* A GPIO controller node, controlling 16 pins indexed from 0.
* The GPIO controller base in the global pin indexing space is pin
* 48, thus pins [0 - 15] on this controller map to pins [48 - 63]
* in the global pin indexing space.
port3: gpio-3 {
#gpio-cells = <2>;
gpio-ranges = <&pinctrl 0 48 16>;
* A serial communication interface with a TX output pin and an RX
* input pin.
* Pin #0 on port #3 is configured as alternate function #6.
* Pin #2 on port #3 is configured as alternate function #4.
scif2_pins: serial2 {
pinmux = <RZA1_PINMUX(3, 0, 6)>, <RZA1_PINMUX(3, 2, 4)>;
* I2c master: both SDA and SCL pins need bi-directional operations
* Pin #4 on port #1 is configured as alternate function #1.
* Pin #5 on port #1 is configured as alternate function #1.
* Both need to work in bi-directional mode, the driver must manage
* this internally.
i2c2_pins: i2c2 {
pinmux = <RZA1_PINMUX(1, 4, 1)>, <RZA1_PINMUX(1, 5, 1)>;
* Multi-function timer input and output compare pins.
tioc0_pins: tioc0 {
* Configure TIOC0A as software driven input
* Pin #0 on port #4 is configured as alternate function #2
* with IO direction specified by software as input.
tioc0_input_pins {
pinmux = <RZA1_PINMUX(4, 0, 2)>;
* Configure TIOC0B as software driven output
* Pin #1 on port #4 is configured as alternate function #1
* with IO direction specified by software as output.
tioc0_output_pins {
pinmux = <RZA1_PINMUX(4, 1, 1)>;