path: root/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml

# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/phy/phy-stm32-usbphyc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: STMicroelectronics STM32 USB HS PHY controller binding

description:

  The STM32 USBPHYC block contains a dual port High Speed UTMI+ PHY and a UTMI
  switch. It controls PHY configuration and status, and the UTMI+ switch that
  selects either OTG or HOST controller for the second PHY port. It also sets
  PLL configuration.

  USBPHYC
  |_ PLL
  |
  |_ PHY port#1 _________________ HOST controller
  |                   __                 |
  |                  / 1|________________|
  |_ PHY port#2 ----|   |________________
  |                  \_0|                |
  |_ UTMI switch_______|          OTG controller

maintainers:
  - Amelie Delaunay <amelie.delaunay@foss.st.com>

properties:
  compatible:
    const: st,stm32mp1-usbphyc

  reg:
    maxItems: 1

  clocks:
    maxItems: 1

  resets:
    maxItems: 1

  "#address-cells":
    const: 1

  "#size-cells":
    const: 0

  vdda1v1-supply:
    description: regulator providing 1V1 power supply to the PLL block

  vdda1v8-supply:
    description: regulator providing 1V8 power supply to the PLL block

  '#clock-cells':
    description: number of clock cells for ck_usbo_48m consumer
    const: 0

#Required child nodes:

patternProperties:
  "^usb-phy@[0|1]$":
    type: object
    description:
      Each port the controller provides must be represented as a sub-node.

    properties:
      reg:
        description: phy port index.
        maxItems: 1

      phy-supply:
        description: regulator providing 3V3 power supply to the PHY.

      "#phy-cells":
        enum: [ 0x0, 0x1 ]

      connector:
        type: object
        $ref: /schemas/connector/usb-connector.yaml
        properties:
          vbus-supply: true

      # It can be necessary to adjust the PHY settings to compensate parasitics, which can be due
      # to USB connector/receptacle, routing, ESD protection component,... Here is the list of
      # all optional parameters to tune the interface of the PHY (HS for High-Speed, FS for Full-
      # Speed, LS for Low-Speed)

      st,current-boost-microamp:
        description: Current boosting in uA
        enum: [ 1000, 2000 ]

      st,no-lsfs-fb-cap:
        description: Disables the LS/FS feedback capacitor
        type: boolean

      st,decrease-hs-slew-rate:
        description: Decreases the HS driver slew rate by 10%
        type: boolean

      st,tune-hs-dc-level:
        description: |
          Tunes the HS driver DC level
          - <0> normal level
          - <1> increases the level by 5 to 7 mV
          - <2> increases the level by 10 to 14 mV
          - <3> decreases the level by 5 to 7 mV
        $ref: /schemas/types.yaml#/definitions/uint32
        minimum: 0
        maximum: 3
        default: 0

      st,enable-fs-rftime-tuning:
        description: Enables the FS rise/fall tuning option
        type: boolean

      st,enable-hs-rftime-reduction:
        description: Enables the HS rise/fall reduction feature
        type: boolean

      st,trim-hs-current:
        description: |
          Controls HS driver current trimming for choke compensation
          - <0> = 18.87 mA target current / nominal + 0%
          - <1> = 19.165 mA target current / nominal + 1.56%
          - <2> = 19.46 mA target current / nominal + 3.12%
          - <3> = 19.755 mA target current / nominal + 4.68%
          - <4> = 20.05 mA target current / nominal + 6.24%
          - <5> = 20.345 mA target current / nominal + 7.8%
          - <6> = 20.64 mA target current / nominal + 9.36%
          - <7> = 20.935 mA target current / nominal + 10.92%
          - <8> = 21.23 mA target current / nominal + 12.48%
          - <9> = 21.525 mA target current / nominal + 14.04%
          - <10> = 21.82 mA target current / nominal + 15.6%
          - <11> = 22.115 mA target current / nominal + 17.16%
          - <12> = 22.458 mA target current / nominal + 19.01%
          - <13> = 22.755 mA target current / nominal + 20.58%
          - <14> = 23.052 mA target current / nominal + 22.16%
          - <15> = 23.348 mA target current / nominal + 23.73%
        $ref: /schemas/types.yaml#/definitions/uint32
        minimum: 0
        maximum: 15
        default: 0

      st,trim-hs-impedance:
        description: |
          Controls HS driver impedance tuning for choke compensation
          - <0> = no impedance offset
          - <1> = reduce the impedance by 2 ohms
          - <2> = reduce the impedance by 4 ohms
          - <3> = reduce the impedance by 6 ohms
        $ref: /schemas/types.yaml#/definitions/uint32
        minimum: 0
        maximum: 3
        default: 0

      st,tune-squelch-level:
        description: |
          Tunes the squelch DC threshold value
          - <0> = no shift in threshold
          - <1> = threshold shift by +7 mV
          - <2> = threshold shift by -5 mV
          - <3> = threshold shift by +14 mV
        $ref: /schemas/types.yaml#/definitions/uint32
        minimum: 0
        maximum: 3
        default: 0

      st,enable-hs-rx-gain-eq:
        description: Enables the HS Rx gain equalizer
        type: boolean

      st,tune-hs-rx-offset:
        description: |
          Adjusts the HS Rx offset
          - <0> = no offset
          - <1> = offset of +5 mV
          - <2> = offset of +10 mV
          - <3> = offset of -5 mV
        $ref: /schemas/types.yaml#/definitions/uint32
        minimum: 0
        maximum: 3
        default: 0

      st,no-hs-ftime-ctrl:
        description: Disables the HS fall time control of single ended signals during pre-emphasis
        type: boolean

      st,no-lsfs-sc:
        description: Disables the short circuit protection in LS/FS driver
        type: boolean

      st,enable-hs-tx-staggering:
        description: Enables the basic staggering in HS Tx mode
        type: boolean

    allOf:
      - if:
          properties:
            reg:
              const: 0
        then:
          properties:
            "#phy-cells":
              const: 0
        else:
          properties:
            "#phy-cells":
              const: 1
              description:
                The value is used to select UTMI switch output.
                0 for OTG controller and 1 for Host controller.

    required:
      - reg
      - phy-supply
      - "#phy-cells"

    additionalProperties: false

required:
  - compatible
  - reg
  - clocks
  - "#address-cells"
  - "#size-cells"
  - vdda1v1-supply
  - vdda1v8-supply
  - usb-phy@0
  - usb-phy@1

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/stm32mp1-clks.h>
    #include <dt-bindings/reset/stm32mp1-resets.h>
    usbphyc: usbphyc@5a006000 {
        compatible = "st,stm32mp1-usbphyc";
        reg = <0x5a006000 0x1000>;
        clocks = <&rcc USBPHY_K>;
        resets = <&rcc USBPHY_R>;
        vdda1v1-supply = <&reg11>;
        vdda1v8-supply = <&reg18>;
        #address-cells = <1>;
        #size-cells = <0>;
        #clock-cells = <0>;

        usbphyc_port0: usb-phy@0 {
            reg = <0>;
            phy-supply = <&vdd_usb>;
            #phy-cells = <0>;
            st,tune-hs-dc-level = <2>;
            st,enable-fs-rftime-tuning;
            st,enable-hs-rftime-reduction;
            st,trim-hs-current = <15>;
            st,trim-hs-impedance = <1>;
            st,tune-squelch-level = <3>;
            st,tune-hs-rx-offset = <2>;
            st,no-lsfs-sc;
            connector {
                compatible = "usb-a-connector";
                vbus-supply = <&vbus_sw>;
            };
        };

        usbphyc_port1: usb-phy@1 {
            reg = <1>;
            phy-supply = <&vdd_usb>;
            #phy-cells = <1>;
            st,tune-hs-dc-level = <2>;
            st,enable-fs-rftime-tuning;
            st,enable-hs-rftime-reduction;
            st,trim-hs-current = <15>;
            st,trim-hs-impedance = <1>;
            st,tune-squelch-level = <3>;
            st,tune-hs-rx-offset = <2>;
            st,no-lsfs-sc;
        };
    };
...