dts/bindings/pinctrl/infineon,cat1-pinctrl.yaml

# Copyright (c) 2022 Cypress Semiconductor Corporation (an Infineon company) or
# an affiliate of Cypress Semiconductor Corporation
#
# SPDX-License-Identifier: Apache-2.0

description: |
  Infineon CAT1 Pinctrl container node

  This is a singleton node responsible for controlling the pin function selection
  and pin properties. For example, you can use this node to route
  UART0 RX to a particular port/pin and enable the pull-up resistor on that
  pin.

  The node has the 'pinctrl' node label set in SoC's devicetree,
  so you can modify it like this:

  &pinctrl {
      /* Your modifications go here */
  };

  Pin configuration can also specify the pin properties, for example the
  'bias-pull-up' property. Here is a list of the supported standard pin
  properties:
    * bias-pull-up
    * bias-pull-down
    * drive-open-drain
    * drive-open-source
    * drive-push-pull   (strong)
    * input-enable      (input-buffer)

  Infineon CAT1 SoC's devicetree includes a set of pre-defined pin control
  Nodes, which can be found via MPN dtsi.
  For example, board cy8cproto_062_4343w uses the CY8C624ABZI_S2D44 part, so
  board dts (boards\arm\cy8cproto_062_4343w\cy8cproto_062_4343w.dts) includes MPN dts
  (infineon/psoc6/mpns/CY8C624ABZI_S2D44.dtsi).

  Each MPN dtsi includes package dtsi (../psoc6_xx/psoc6_xx.yyy-zzz.dtsi),
  For example, CY8C624ABZI_S2D44 includes "../psoc6_02/psoc6_02.124-bga.dtsi".

  An example of pre-defined pin control from package dtsi (e.g. psoc6_02.124-bga.dtsi):
  p3_0_scb2_uart_rx - RX pin UART2 (SCB2) which connected to port3.0

    /omit-if-no-ref/ p3_0_scb2_uart_rx: p3_0_scb2_uart_rx {
          pinmux = <DT_CAT1_PINMUX(3, 0, HSIOM_SEL_ACT_6)>;
    };

  Refer to psoc6_02.124-bga.dtsi for the list of all pre-defined pin control nodes.

  NOTE1 Pre-defined pin control nodes use macro DT_CAT1_PINMUX to
    initialize pinmux. DT_CAT1_PINMUX has the following input parameters
    DT_CAT1_PINMUX(port_number, pin_number, hsiom),
    hsiom is defined in the HSIOM_SEL_xxx macros in the
    zephyr\include\zephyr\dt-bindings\pinctrl\ifx_cat1-pinctrl.h file.

        You can use DT_CAT1_PINMUX to define your own pin control node:
          &pinctrl {
              my_uart_rx: my_uart_rx {
                  pinmux = <DT_CAT1_PINMUX(3, 0, HSIOM_SEL_ACT_6)>;
              };
          };

  NOTE2 Pre-defined pin control nodes do not have bias pin configuration.
    The bias configuration can be updated in board-pinctrl.dtsi
    &pinctrl {
      /* Configure pin control Bias mode for uart2 pins */
      p3_1_scb2_uart_tx {
        drive-push-pull;
      };

      p3_0_scb2_uart_rx {
        input-enable;
      };

      p3_2_scb2_uart_rts {
        drive-push-pull;
      };

      p3_3_scb2_uart_cts {
        input-enable;
      };
    };

  An example of the usage of pre-defined pin control nodes in your board's DTS file:

    &uart5 {
      pinctrl-0 = <&p5_1_scb5_uart_tx &p5_0_scb5_uart_rx>;
      pinctrl-names = "default";
    };

    /* Configure pin control bias mode for uart5 pins */
    &p5_1_scb5_uart_tx {
      drive-push-pull;
    };

    &p5_0_scb5_uart_rx {
      input-enable;
    };

compatible: "infineon,cat1-pinctrl"

include: base.yaml

child-binding:
  description: This binding gives a base representation of the Infineon CAT1 pins configuration
  include:
    - name: pincfg-node.yaml
      property-allowlist:
        - bias-pull-down
        - bias-pull-up
        - drive-push-pull
        - drive-open-drain
        - drive-open-source
        - input-enable

  properties:
    pinmux:
      description: |
        Encodes port/pin and alternate function.
      required: true
      type: int