dts/bindings/pinctrl/nxp,s32k3-pinctrl.yaml

# Copyright 2023 NXP
# SPDX-License-Identifier: Apache-2.0

description: |
  NXP S32 pinctrl node for S32K3 SoCs.

  The NXP S32 pin controller is a singleton node responsible for controlling
  the pin function selection and pin properties. This node, labeled 'pinctrl' in
  the SoC's devicetree, will define pin configurations in pin groups. Each group
  within the pin configuration defines the pin configuration for a peripheral,
  and each numbered subgroup in the pin group defines all the pins for that
  peripheral with the same configuration properties. The 'pinmux' property in
  a group selects the pins to be configured, and the remaining properties set
  configuration values for those pins.

  For example, to configure the pinmux for UART0, modify the 'pinctrl' from your
  board or application devicetree overlay as follows:

    /* Include the SoC package header containing the predefined pins definitions */
    #include <nxp/s32/S32K344-257BGA-pinctrl.h>

    &pinctrl {
      uart0_default: uart0_default {
        group1 {
          pinmux = <PTA3_LPUART0_TX_O>;
          output-enable;
        };
        group2 {
          pinmux = <PTA28_LPUART0_RX>;
          input-enable;
        };
      };
    };

  The 'uart0_default' node contains the pin configurations for a particular state
  of a device. The 'default' state is the active state. Other states for the same
  device can be specified in separate child nodes of 'pinctrl'.

  In addition to 'pinmux' property, each group can contain other properties such as
  'bias-pull-up' or 'slew-rate' that will be applied to all the pins defined in
  'pinmux' array. To enable the input buffer use 'input-enable' and to enable the
  output buffer use 'output-enable'.

  To link the pin configurations with UART0 device, use pinctrl-N property in the
  device node, where 'N' is the zero-based state index (0 is the default state).
  Following previous example:

    &uart0 {
      pinctrl-0 = <&uart0_default>;
      pinctrl-names = "default";
      status = "okay";
    };

  If only the required properties are supplied, the pin configuration register
  will be assigned the following values:
    - input and output buffers disabled
    - internal pull not enabled
    - slew rate "fastest"
    - invert disabled
    - drive strength disabled.

  Additionally, following settings are currently not supported and default to
  the values indicated below:
    - Safe Mode Control (disabled)
    - Pad Keeping (disabled)
    - Input Filter (disabled).

compatible: "nxp,s32k3-pinctrl"

include: base.yaml

child-binding:
  description: NXP S32 pin controller pin group.
  child-binding:
    description: NXP S32 pin controller pin configuration node.

    include:
      - name: pincfg-node.yaml
        property-allowlist:
          - bias-disable
          - bias-pull-down
          - bias-pull-up
          - input-enable
          - output-enable

    properties:
      pinmux:
        required: true
        type: array
        description: |
          An array of pins sharing the same group properties. The pins must be
          defined using the S32_PINMUX macros that encodes all the pin muxing
          information in a 32-bit value.

      slew-rate:
        type: string
        enum:
          - "fastest"
          - "slowest"
        default: "fastest"
        description: |
          Slew rate control. Can be either slowest or fastest setting.
          See the SoC reference manual for applicability of this setting.

      nxp,invert:
        type: boolean
        description: |
          Invert the signal selected by Source Signal Selection (SSS) before
          transmitting it to the associated destination (chip pin or module port).

      nxp,drive-strength:
        type: boolean
        description: |
          Drive strength enable.
          See the SoC reference manual for applicability of this setting.