Bindings/mmc/marvell,xenon-sdhci.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/mmc/marvell,xenon-sdhci.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Marvell Xenon SDHCI Controller

description: |
  This file documents differences between the core MMC properties described by
  mmc-controller.yaml and the properties used by the Xenon implementation.

  Multiple SDHCs might be put into a single Xenon IP, to save size and cost.
  Each SDHC is independent and owns independent resources, such as register
  sets, clock and PHY.

  Each SDHC should have an independent device tree node.

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

properties:
  compatible:
    oneOf:
      - enum:
          - marvell,armada-cp110-sdhci
          - marvell,armada-ap806-sdhci

      - items:
          - const: marvell,armada-ap807-sdhci
          - const: marvell,armada-ap806-sdhci

      - items:
          - const: marvell,armada-3700-sdhci
          - const: marvell,sdhci-xenon

  reg:
    minItems: 1
    maxItems: 2
    description: |
      For "marvell,armada-3700-sdhci", two register areas.  The first one
      for Xenon IP register. The second one for the Armada 3700 SoC PHY PAD
      Voltage Control register.  Please follow the examples with compatible
      "marvell,armada-3700-sdhci" in below.
      Please also check property marvell,pad-type in below.

      For other compatible strings, one register area for Xenon IP.

  clocks:
    minItems: 1
    maxItems: 2

  clock-names:
    minItems: 1
    items:
      - const: core
      - const: axi

  interrupts:
    maxItems: 1

  marvell,xenon-sdhc-id:
    $ref: /schemas/types.yaml#/definitions/uint32
    minimum: 0
    maximum: 7
    description: |
      Indicate the corresponding bit index of current SDHC in SDHC System
      Operation Control Register Bit[7:0].  Set/clear the corresponding bit to
      enable/disable current SDHC.

  marvell,xenon-phy-type:
    $ref: /schemas/types.yaml#/definitions/string
    enum:
      - emmc 5.1 phy
      - emmc 5.0 phy
    description: |
      Xenon support multiple types of PHYs. To select eMMC 5.1 PHY, set:
      marvell,xenon-phy-type = "emmc 5.1 phy" eMMC 5.1 PHY is the default
      choice if this property is not provided.  To select eMMC 5.0 PHY, set:
      marvell,xenon-phy-type = "emmc 5.0 phy"

      All those types of PHYs can support eMMC, SD and SDIO. Please note that
      this property only presents the type of PHY.  It doesn't stand for the
      entire SDHC type or property.  For example, "emmc 5.1 phy" doesn't mean
      that this Xenon SDHC only supports eMMC 5.1.

  marvell,xenon-phy-znr:
    $ref: /schemas/types.yaml#/definitions/uint32
    minimum: 0
    maximum: 0x1f
    default: 0xf
    description: |
      Set PHY ZNR value.
      Only available for eMMC PHY.

  marvell,xenon-phy-zpr:
    $ref: /schemas/types.yaml#/definitions/uint32
    minimum: 0
    maximum: 0x1f
    default: 0xf
    description: |
      Set PHY ZPR value.
      Only available for eMMC PHY.

  marvell,xenon-phy-nr-success-tun:
    $ref: /schemas/types.yaml#/definitions/uint32
    minimum: 1
    maximum: 7
    default: 0x4
    description: |
      Set the number of required consecutive successful sampling points
      used to identify a valid sampling window, in tuning process.

  marvell,xenon-phy-tun-step-divider:
    $ref: /schemas/types.yaml#/definitions/uint32
    default: 64
    description: |
      Set the divider for calculating TUN_STEP.

  marvell,xenon-phy-slow-mode:
    type: boolean
    description: |
      If this property is selected, transfers will bypass PHY.
      Only available when bus frequency lower than 55MHz in SDR mode.
      Disabled by default. Please only try this property if timing issues
      always occur with PHY enabled in eMMC HS SDR, SD SDR12, SD SDR25,
      SD Default Speed and HS mode and eMMC legacy speed mode.

  marvell,xenon-tun-count:
    $ref: /schemas/types.yaml#/definitions/uint32
    default: 0x9
    description: |
      Xenon SDHC SoC usually doesn't provide re-tuning counter in
      Capabilities Register 3 Bit[11:8].
      This property provides the re-tuning counter.

allOf:
  - $ref: mmc-controller.yaml#
  - if:
      properties:
        compatible:
          contains:
            const: marvell,armada-3700-sdhci

    then:
      properties:
        reg:
          items:
            - description: Xenon IP registers
            - description: Armada 3700 SoC PHY PAD Voltage Control register

        marvell,pad-type:
          $ref: /schemas/types.yaml#/definitions/string
          enum:
            - sd
            - fixed-1-8v
          description: |
            Type of Armada 3700 SoC PHY PAD Voltage Controller register.
            If "sd" is selected, SoC PHY PAD is set as 3.3V at the beginning
            and is switched to 1.8V when later in higher speed mode.
            If "fixed-1-8v" is selected, SoC PHY PAD is fixed 1.8V, such as for
            eMMC.
            Please follow the examples with compatible
            "marvell,armada-3700-sdhci" in below.

      required:
        - marvell,pad-type

  - if:
      properties:
        compatible:
          contains:
            enum:
              - marvell,armada-cp110-sdhci
              - marvell,armada-ap807-sdhci
              - marvell,armada-ap806-sdhci

    then:
      properties:
        clocks:
          minItems: 2

        clock-names:
          items:
            - const: core
            - const: axi


required:
  - compatible
  - reg
  - clocks
  - clock-names

unevaluatedProperties: false

examples:
  - |
    // For eMMC
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/interrupt-controller/irq.h>

    mmc@aa0000 {
      compatible = "marvell,armada-ap807-sdhci", "marvell,armada-ap806-sdhci";
      reg = <0xaa0000 0x1000>;
      interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
      clocks = <&emmc_clk 0>, <&axi_clk 0>;
      clock-names = "core", "axi";
      bus-width = <4>;
      marvell,xenon-phy-slow-mode;
      marvell,xenon-tun-count = <11>;
      non-removable;
      no-sd;
      no-sdio;

      /* Vmmc and Vqmmc are both fixed */
    };

  - |
    // For SD/SDIO
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/interrupt-controller/irq.h>

    mmc@ab0000 {
      compatible = "marvell,armada-cp110-sdhci";
      reg = <0xab0000 0x1000>;
      interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>;
      vqmmc-supply = <&sd_vqmmc_regulator>;
      vmmc-supply = <&sd_vmmc_regulator>;
      clocks = <&sdclk 0>, <&axi_clk 0>;
      clock-names = "core", "axi";
      bus-width = <4>;
      marvell,xenon-tun-count = <9>;
    };

  - |
    // For eMMC with compatible "marvell,armada-3700-sdhci":
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/interrupt-controller/irq.h>

    mmc@aa0000 {
      compatible = "marvell,armada-3700-sdhci", "marvell,sdhci-xenon";
      reg = <0xaa0000 0x1000>,
            <0x17808 0x4>;
      interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
      clocks = <&emmcclk 0>;
      clock-names = "core";
      bus-width = <8>;
      mmc-ddr-1_8v;
      mmc-hs400-1_8v;
      non-removable;
      no-sd;
      no-sdio;

      /* Vmmc and Vqmmc are both fixed */

      marvell,pad-type = "fixed-1-8v";
    };

  - |
    // For SD/SDIO with compatible "marvell,armada-3700-sdhci":
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/interrupt-controller/irq.h>

    mmc@ab0000 {
      compatible = "marvell,armada-3700-sdhci", "marvell,sdhci-xenon";
      reg = <0xab0000 0x1000>,
            <0x17808 0x4>;
      interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>;
      vqmmc-supply = <&sd_regulator>;
      /* Vmmc is fixed */
      clocks = <&sdclk 0>;
      clock-names = "core";
      bus-width = <4>;

      marvell,pad-type = "sd";
    };