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linuxdebug/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml

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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
# Copyright (C) STMicroelectronics 2019.
%YAML 1.2
---
$id: http://devicetree.org/schemas/pinctrl/st,stm32-pinctrl.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: STM32 GPIO and Pin Mux/Config controller
maintainers:
- Alexandre TORGUE <alexandre.torgue@foss.st.com>
description: |
STMicroelectronics's STM32 MCUs intregrate a GPIO and Pin mux/config hardware
controller. It controls the input/output settings on the available pins and
also provides ability to multiplex and configure the output of various
on-chip controllers onto these pads.
properties:
compatible:
enum:
- st,stm32f429-pinctrl
- st,stm32f469-pinctrl
- st,stm32f746-pinctrl
- st,stm32f769-pinctrl
- st,stm32h743-pinctrl
- st,stm32mp135-pinctrl
- st,stm32mp157-pinctrl
- st,stm32mp157-z-pinctrl
'#address-cells':
const: 1
'#size-cells':
const: 1
ranges: true
pins-are-numbered: true
hwlocks: true
interrupts:
maxItems: 1
st,syscfg:
description: Phandle+args to the syscon node which includes IRQ mux selection.
$ref: "/schemas/types.yaml#/definitions/phandle-array"
items:
- items:
- description: syscon node which includes IRQ mux selection
- description: The offset of the IRQ mux selection register
- description: The field mask of IRQ mux, needed if different of 0xf
st,package:
description:
Indicates the SOC package used.
More details in include/dt-bindings/pinctrl/stm32-pinfunc.h
$ref: /schemas/types.yaml#/definitions/uint32
enum: [1, 2, 4, 8]
patternProperties:
'^gpio@[0-9a-f]*$':
type: object
additionalProperties: false
properties:
gpio-controller: true
'#gpio-cells':
const: 2
interrupt-controller: true
'#interrupt-cells':
const: 2
reg:
maxItems: 1
clocks:
maxItems: 1
resets:
maxItems: 1
gpio-line-names: true
gpio-ranges:
minItems: 1
maxItems: 16
ngpios:
description:
Number of available gpios in a bank.
minimum: 1
maximum: 16
st,bank-name:
description:
Should be a name string for this bank as specified in the datasheet.
$ref: "/schemas/types.yaml#/definitions/string"
enum:
- GPIOA
- GPIOB
- GPIOC
- GPIOD
- GPIOE
- GPIOF
- GPIOG
- GPIOH
- GPIOI
- GPIOJ
- GPIOK
- GPIOZ
st,bank-ioport:
description:
Should correspond to the EXTI IOport selection (EXTI line used
to select GPIOs as interrupts).
$ref: "/schemas/types.yaml#/definitions/uint32"
minimum: 0
maximum: 11
patternProperties:
"^(.+-hog(-[0-9]+)?)$":
type: object
required:
- gpio-hog
required:
- gpio-controller
- '#gpio-cells'
- reg
- clocks
- st,bank-name
'-[0-9]*$':
type: object
additionalProperties: false
patternProperties:
'^pins':
type: object
additionalProperties: false
description: |
A pinctrl node should contain at least one subnode representing the
pinctrl group available on the machine. Each subnode will list the
pins it needs, and how they should be configured, with regard to muxer
configuration, pullups, drive, output high/low and output speed.
properties:
pinmux:
$ref: "/schemas/types.yaml#/definitions/uint32-array"
description: |
Integer array, represents gpio pin number and mux setting.
Supported pin number and mux varies for different SoCs, and are
defined in dt-bindings/pinctrl/<soc>-pinfunc.h directly.
These defines are calculated as: ((port * 16 + line) << 8) | function
With:
- port: The gpio port index (PA = 0, PB = 1, ..., PK = 11)
- line: The line offset within the port (PA0 = 0, PA1 = 1, ..., PA15 = 15)
- function: The function number, can be:
* 0 : GPIO
* 1 : Alternate Function 0
* 2 : Alternate Function 1
* 3 : Alternate Function 2
* ...
* 16 : Alternate Function 15
* 17 : Analog
To simplify the usage, macro is available to generate "pinmux" field.
This macro is available here:
- include/dt-bindings/pinctrl/stm32-pinfunc.h
Some examples of using macro:
/* GPIO A9 set as alernate function 2 */
... {
pinmux = <STM32_PINMUX('A', 9, AF2)>;
};
/* GPIO A9 set as GPIO */
... {
pinmux = <STM32_PINMUX('A', 9, GPIO)>;
};
/* GPIO A9 set as analog */
... {
pinmux = <STM32_PINMUX('A', 9, ANALOG)>;
};
bias-disable:
type: boolean
bias-pull-down:
type: boolean
bias-pull-up:
type: boolean
drive-push-pull:
type: boolean
drive-open-drain:
type: boolean
output-low:
type: boolean
output-high:
type: boolean
slew-rate:
description: |
0: Low speed
1: Medium speed
2: Fast speed
3: High speed
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
required:
- pinmux
allOf:
- $ref: "pinctrl.yaml#"
required:
- compatible
- '#address-cells'
- '#size-cells'
- ranges
- pins-are-numbered
additionalProperties: false
examples:
- |
#include <dt-bindings/pinctrl/stm32-pinfunc.h>
#include <dt-bindings/mfd/stm32f4-rcc.h>
//Example 1
pinctrl@40020000 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "st,stm32f429-pinctrl";
ranges = <0 0x40020000 0x3000>;
pins-are-numbered;
gpioa: gpio@0 {
gpio-controller;
#gpio-cells = <2>;
reg = <0x0 0x400>;
resets = <&reset_ahb1 0>;
clocks = <&rcc 0 STM32F4_AHB1_CLOCK(GPIOA)>;
st,bank-name = "GPIOA";
};
};
//Example 2 (using gpio-ranges)
pinctrl@50020000 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "st,stm32f429-pinctrl";
ranges = <0 0x50020000 0x3000>;
pins-are-numbered;
gpiob: gpio@1000 {
gpio-controller;
#gpio-cells = <2>;
reg = <0x1000 0x400>;
resets = <&reset_ahb1 0>;
clocks = <&rcc 0 STM32F4_AHB1_CLOCK(GPIOB)>;
st,bank-name = "GPIOB";
gpio-ranges = <&pinctrl 0 0 16>;
};
gpioc: gpio@2000 {
gpio-controller;
#gpio-cells = <2>;
reg = <0x2000 0x400>;
resets = <&reset_ahb1 0>;
clocks = <&rcc 0 STM32F4_AHB1_CLOCK(GPIOC)>;
st,bank-name = "GPIOC";
ngpios = <5>;
gpio-ranges = <&pinctrl 0 16 3>,
<&pinctrl 14 30 2>;
};
};
//Example 3 pin groups
pinctrl {
usart1_pins_a: usart1-0 {
pins1 {
pinmux = <STM32_PINMUX('A', 9, AF7)>;
bias-disable;
drive-push-pull;
slew-rate = <0>;
};
pins2 {
pinmux = <STM32_PINMUX('A', 10, AF7)>;
bias-disable;
};
};
};
usart1 {
pinctrl-0 = <&usart1_pins_a>;
pinctrl-names = "default";
};
...
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