path: root/Documentation/devicetree/bindings/mmc/mmc-controller.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/mmc/mmc-controller.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: MMC Controller Generic Binding

maintainers:
  - Ulf Hansson <ulf.hansson@linaro.org>

description: |
  These properties are common to multiple MMC host controllers. Any host
  that requires the respective functionality should implement them using
  these definitions.

properties:
  $nodename:
    pattern: "^mmc(@.*)?$"

  "#address-cells":
    const: 1
    description: |
      The cell is the slot ID if a function subnode is used.

  "#size-cells":
    const: 0

  # Card Detection.
  # If none of these properties are supplied, the host native card
  # detect will be used. Only one of them should be provided.

  broken-cd:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      There is no card detection available; polling must be used.

  cd-gpios:
    description:
      The card detection will be done using the GPIO provided.

  non-removable:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      Non-removable slot (like eMMC); assume always present.

  # *NOTE* on CD and WP polarity. To use common for all SD/MMC host
  # controllers line polarity properties, we have to fix the meaning
  # of the "normal" and "inverted" line levels. We choose to follow
  # the SDHCI standard, which specifies both those lines as "active
  # low." Therefore, using the "cd-inverted" property means, that the
  # CD line is active high, i.e. it is high, when a card is
  # inserted. Similar logic applies to the "wp-inverted" property.
  #
  # CD and WP lines can be implemented on the hardware in one of two
  # ways: as GPIOs, specified in cd-gpios and wp-gpios properties, or
  # as dedicated pins. Polarity of dedicated pins can be specified,
  # using *-inverted properties. GPIO polarity can also be specified
  # using the GPIO_ACTIVE_LOW flag. This creates an ambiguity in the
  # latter case. We choose to use the XOR logic for GPIO CD and WP
  # lines.  This means, the two properties are "superimposed," for
  # example leaving the GPIO_ACTIVE_LOW flag clear and specifying the
  # respective *-inverted property property results in a
  # double-inversion and actually means the "normal" line polarity is
  # in effect.
  wp-inverted:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      The Write Protect line polarity is inverted.

  cd-inverted:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      The CD line polarity is inverted.

  # Other properties

  bus-width:
    allOf:
      - $ref: /schemas/types.yaml#/definitions/uint32
      - enum: [1, 4, 8]
        default: 1
    description:
      Number of data lines.

  max-frequency:
    allOf:
      - $ref: /schemas/types.yaml#/definitions/uint32
      - minimum: 400000
      - maximum: 200000000
    description:
      Maximum operating frequency of the bus.

  disable-wp:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      When set, no physical write-protect line is present. This
      property should only be specified when the controller has a
      dedicated write-protect detection logic. If a GPIO is always
      used for the write-protect detection. If a GPIO is always used
      for the write-protect detection logic, it is sufficient to not
      specify the wp-gpios property in the absence of a write-protect
      line.

  wp-gpios:
    description:
      GPIO to use for the write-protect detection.

  cd-debounce-delay-ms:
    description:
      Set delay time before detecting card after card insert
      interrupt.

  no-1-8-v:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      When specified, denotes that 1.8V card voltage is not supported
      on this system, even if the controller claims it.

  cap-sd-highspeed:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      SD high-speed timing is supported.

  cap-mmc-highspeed:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      MMC high-speed timing is supported.

  sd-uhs-sdr12:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      SD UHS SDR12 speed is supported.

  sd-uhs-sdr25:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      SD UHS SDR25 speed is supported.

  sd-uhs-sdr50:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      SD UHS SDR50 speed is supported.

  sd-uhs-sdr104:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      SD UHS SDR104 speed is supported.

  sd-uhs-ddr50:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      SD UHS DDR50 speed is supported.

  cap-power-off-card:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      Powering off the card is safe.

  cap-mmc-hw-reset:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      eMMC hardware reset is supported

  cap-sdio-irq:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      enable SDIO IRQ signalling on this interface

  full-pwr-cycle:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      Full power cycle of the card is supported.

  mmc-ddr-1_2v:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      eMMC high-speed DDR mode (1.2V I/O) is supported.

  mmc-ddr-1_8v:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      eMMC high-speed DDR mode (1.8V I/O) is supported.

  mmc-ddr-3_3v:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      eMMC high-speed DDR mode (3.3V I/O) is supported.

  mmc-hs200-1_2v:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      eMMC HS200 mode (1.2V I/O) is supported.

  mmc-hs200-1_8v:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      eMMC HS200 mode (1.8V I/O) is supported.

  mmc-hs400-1_2v:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      eMMC HS400 mode (1.2V I/O) is supported.

  mmc-hs400-1_8v:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      eMMC HS400 mode (1.8V I/O) is supported.

  mmc-hs400-enhanced-strobe:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      eMMC HS400 enhanced strobe mode is supported

  dsr:
    allOf:
      - $ref: /schemas/types.yaml#/definitions/uint32
      - minimum: 0
      - maximum: 0xffff
    description:
      Value the card Driver Stage Register (DSR) should be programmed
      with.

  no-sdio:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      Controller is limited to send SDIO commands during
      initialization.

  no-sd:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      Controller is limited to send SD commands during initialization.

  no-mmc:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      Controller is limited to send MMC commands during
      initialization.

  fixed-emmc-driver-type:
    allOf:
      - $ref: /schemas/types.yaml#/definitions/uint32
      - minimum: 0
      - maximum: 4
    description:
      For non-removable eMMC, enforce this driver type. The value is
      the driver type as specified in the eMMC specification (table
      206 in spec version 5.1)

  post-power-on-delay-ms:
    allOf:
      - $ref: /schemas/types.yaml#/definitions/uint32
      - default: 10
    description:
      It was invented for MMC pwrseq-simple which could be referred to
      mmc-pwrseq-simple.txt. But now it\'s reused as a tunable delay
      waiting for I/O signalling and card power supply to be stable,
      regardless of whether pwrseq-simple is used. Default to 10ms if
      no available.

  supports-cqe:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      The presence of this property indicates that the corresponding
      MMC host controller supports HW command queue feature.

  disable-cqe-dcmd:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      The presence of this property indicates that the MMC
      controller\'s command queue engine (CQE) does not support direct
      commands (DCMDs).

  keep-power-in-suspend:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      SDIO only. Preserves card power during a suspend/resume cycle.

  # Deprecated: enable-sdio-wakeup
  wakeup-source:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      SDIO only. Enables wake up of host system on SDIO IRQ assertion.

  vmmc-supply:
    description:
      Supply for the card power

  vqmmc-supply:
    description:
      Supply for the bus IO line power

  mmc-pwrseq:
    $ref: /schemas/types.yaml#/definitions/phandle
    description:
      System-on-Chip designs may specify a specific MMC power
      sequence. To successfully detect an (e)MMC/SD/SDIO card, that
      power sequence must be maintained while initializing the card.

patternProperties:
  "^.*@[0-9]+$":
    type: object
    description: |
      On embedded systems the cards connected to a host may need
      additional properties. These can be specified in subnodes to the
      host controller node. The subnodes are identified by the
      standard \'reg\' property. Which information exactly can be
      specified depends on the bindings for the SDIO function driver
      for the subnode, as specified by the compatible string.

    properties:
      compatible:
        description: |
          Name of SDIO function following generic names recommended
          practice

      reg:
        items:
          - minimum: 0
            maximum: 7
            description:
              Must contain the SDIO function number of the function this
              subnode describes. A value of 0 denotes the memory SD
              function, values from 1 to 7 denote the SDIO functions.

      broken-hpi:
        $ref: /schemas/types.yaml#/definitions/flag
        description:
          Use this to indicate that the mmc-card has a broken hpi
          implementation, and that hpi should not be used.

    required:
      - reg

dependencies:
  cd-debounce-delay-ms: [ cd-gpios ]
  fixed-emmc-driver-type: [ non-removable ]

examples:
  - |
    sdhci@ab000000 {
        compatible = "sdhci";
        reg = <0xab000000 0x200>;
        interrupts = <23>;
        bus-width = <4>;
        cd-gpios = <&gpio 69 0>;
        cd-inverted;
        wp-gpios = <&gpio 70 0>;
        max-frequency = <50000000>;
        keep-power-in-suspend;
        wakeup-source;
        mmc-pwrseq = <&sdhci0_pwrseq>;
    };

  - |
    mmc3: mmc@1c12000 {
        #address-cells = <1>;
        #size-cells = <0>;
        pinctrl-names = "default";
        pinctrl-0 = <&mmc3_pins_a>;
        vmmc-supply = <&reg_vmmc3>;
        bus-width = <4>;
        non-removable;
        mmc-pwrseq = <&sdhci0_pwrseq>;

        brcmf: bcrmf@1 {
            reg = <1>;
            compatible = "brcm,bcm43xx-fmac";
            interrupt-parent = <&pio>;
            interrupts = <10 8>;
            interrupt-names = "host-wake";
        };
    };