dts/bindings/pinctrl/st,stm32f1-pinctrl.yaml

# Copyright (c) 2020 Linaro Limited
# SPDX-License-Identifier: Apache-2.0

description: |
    STM32F1 Pin controller Node
    Based on pincfg-node.yaml binding.

    Note: `bias-disable` and `drive-push-pull` are default pin configurations.
           They will be applied in case no `bias-foo` or `driver-bar` properties
           are set.

compatible: "st,stm32f1-pinctrl"

include: base.yaml

properties:
  reg:
    required: true

  swj-cfg:
    type: string
    default: "full" # reset state
    enum:
      - "full"
      - "no-njtrst"
      - "jtag-disable"
      - "disable"
    description: |
      Configures number of pins assigned to the SWJ debug port.

      * full         - Full SWJ (JTAG-DP + SW-DP).
      * no-njtrst    - Full SWJ (JTAG-DP + SW-DP) but without NJTRST.
                       Releases: PB4.
      * jtag-disable - JTAG-DP Disabled and SW-DP Enabled.
                       Releases: PA15 PB3 PB4.
      * disable      - JTAG-DP Disabled and SW-DP Disabled.
                       Releases: PA13 PA14 PA15 PB3 PB4.

      If absent, then Full SWJ (JTAG-DP + SW-DP) is used (reset state).

child-binding:
  description: |
      This binding gives a base representation of the STM32F1 pins
      configuration

  include:
    - name: pincfg-node.yaml
      property-allowlist:
        - bias-disable
        - bias-pull-down
        - bias-pull-up
        - drive-push-pull
        - drive-open-drain
        - output-low
        - output-high

  properties:
    pinmux:
      required: true
      type: int
      description: |
        Adapted from
        https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml
        Integer array, represents gpio pin number and mux setting.
        These defines are calculated as: ((port * 16 + line) << 8) | (function << 6) | remap)
        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 configuration mode, can be:
        * 0 : Alternate function output
        * 1 : Input
        * 2 : Analog
        * 3 : GPIO output
        In case selected pin function is GPIO output, pin is statically configured as
        a plain output GPIO, which configuration can be set by adding 'ouptut-low' or
        'output-high' properties to the pinctrl configuration. Default is output-low.
        - remap: The pin remapping configuration. It allows to assign the pin
        function to a different peripheral. Remain configuration can be:
        * 0 : No remap
        * 1 : Partial remap 1
        * 2 : Partial remap 2
        * 3 : Partial remap 3
        * 4 : Full remap
        To simplify the usage, macro is available to generate "pinmux" field.
        This macro is available here:
          -include/zephyr/dt-bindings/pinctrl/stm32f1-pinctrl.h
        Some examples of macro usage:
           GPIO A9 set as alternate with no remap
        ... {
                 pinmux = <STM32F1_PINMUX('A', 9, ALTERNATE, REMAP_NO)>;
        };
           GPIO A9 set as alternate with full remap
        ... {
                 pinmux = <STM32F1_PINMUX('A', 9, ALTERNATE, REMAP_FULL)>;
        };
           GPIO A9 set as input
        ... {
                 pinmux = <STM32F1_PINMUX('A', 9, GPIO_IN, REMAP_NO)>;
        };
           GPIO A9 set as output-high
        ... {
                 pinmux = <STM32F1_PINMUX('A', 9, GPIO_OUT, REMAP_NO)>;
                 output-high;
        };

    slew-rate:
      type: string
      default: "max-speed-10mhz"
      enum:
        - "max-speed-10mhz"       # Default
        - "max-speed-2mhz"
        - "max-speed-50mhz"
      description: |
        Pin output mode, maximum achievable speed. Only applies to
        output mode (alternate).