xref: /kernel/linux/linux-6.6/Documentation/devicetree/bindings/mmc/samsung,exynos-dw-mshc.yaml

# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/mmc/samsung,exynos-dw-mshc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title:
  Samsung Exynos SoC specific extensions to the Synopsys Designware Mobile
  Storage Host Controller

maintainers:
  - Jaehoon Chung <jh80.chung@samsung.com>
  - Krzysztof Kozlowski <krzk@kernel.org>

properties:
  compatible:
    enum:
      - samsung,exynos4210-dw-mshc
      - samsung,exynos4412-dw-mshc
      - samsung,exynos5250-dw-mshc
      - samsung,exynos5420-dw-mshc
      - samsung,exynos5420-dw-mshc-smu
      - samsung,exynos7-dw-mshc
      - samsung,exynos7-dw-mshc-smu
      - axis,artpec8-dw-mshc

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  clocks:
    maxItems: 2
    description:
      Handle to "biu" and "ciu" clocks for the
      bus interface unit clock and the card interface unit clock.

  clock-names:
    items:
      - const: biu
      - const: ciu

  samsung,dw-mshc-ciu-div:
    $ref: /schemas/types.yaml#/definitions/uint32
    minimum: 0
    maximum: 7
    description:
      The divider value for the card interface unit (ciu) clock.

  samsung,dw-mshc-ddr-timing:
    $ref: /schemas/types.yaml#/definitions/uint32-array
    items:
      - description: CIU clock phase shift value for tx mode
        minimum: 0
        maximum: 7
      - description: CIU clock phase shift value for rx mode
        minimum: 0
        maximum: 7
    description:
      The value of CUI clock phase shift value in transmit mode and CIU clock
      phase shift value in receive mode for double data rate mode operation.
      See also samsung,dw-mshc-hs400-timing property.

  samsung,dw-mshc-hs400-timing:
    $ref: /schemas/types.yaml#/definitions/uint32-array
    items:
      - description: CIU clock phase shift value for tx mode
        minimum: 0
        maximum: 7
      - description: CIU clock phase shift value for rx mode
        minimum: 0
        maximum: 7
    description: |
      The value of CIU TX and RX clock phase shift value for HS400 mode
      operation.
      Valid values for SDR and DDR CIU clock timing::
        - valid value for tx phase shift and rx phase shift is 0 to 7.
        - when CIU clock divider value is set to 3, all possible 8 phase shift
          values can be used.
        - if CIU clock divider value is 0 (that is divide by 1), both tx and rx
          phase shift clocks should be 0.
      If missing, values from samsung,dw-mshc-ddr-timing property are used.

  samsung,dw-mshc-sdr-timing:
    $ref: /schemas/types.yaml#/definitions/uint32-array
    items:
      - description: CIU clock phase shift value for tx mode
        minimum: 0
        maximum: 7
      - description: CIU clock phase shift value for rx mode
        minimum: 0
        maximum: 7
    description:
      The value of CIU clock phase shift value in transmit mode and CIU clock
      phase shift value in receive mode for single data rate mode operation.
      See also samsung,dw-mshc-hs400-timing property.

  samsung,read-strobe-delay:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      RCLK (Data strobe) delay to control HS400 mode (Latency value for delay
      line in Read path). If missing, default from hardware is used.

required:
  - compatible
  - reg
  - interrupts
  - clocks
  - clock-names
  - samsung,dw-mshc-ddr-timing
  - samsung,dw-mshc-sdr-timing

allOf:
  - $ref: synopsys-dw-mshc-common.yaml#
  - if:
      properties:
        compatible:
          contains:
            enum:
              - samsung,exynos5250-dw-mshc
              - samsung,exynos5420-dw-mshc
              - samsung,exynos7-dw-mshc
              - samsung,exynos7-dw-mshc-smu
              - axis,artpec8-dw-mshc
    then:
      required:
        - samsung,dw-mshc-ciu-div

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/clock/exynos5420.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>

    mmc@12220000 {
        compatible = "samsung,exynos5420-dw-mshc";
        interrupts = <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>;
        #address-cells = <1>;
        #size-cells = <0>;
        reg = <0x12220000 0x1000>;
        clocks = <&clock CLK_MMC2>, <&clock CLK_SCLK_MMC2>;
        clock-names = "biu", "ciu";
        fifo-depth = <0x40>;
        card-detect-delay = <200>;
        samsung,dw-mshc-ciu-div = <3>;
        samsung,dw-mshc-sdr-timing = <0 4>;
        samsung,dw-mshc-ddr-timing = <0 2>;
        pinctrl-names = "default";
        pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_cd &sd2_wp &sd2_bus1 &sd2_bus4>;
        bus-width = <4>;
        cap-sd-highspeed;
        max-frequency = <200000000>;
        vmmc-supply = <&ldo19_reg>;
        vqmmc-supply = <&ldo13_reg>;
        sd-uhs-sdr50;
        sd-uhs-sdr104;
        sd-uhs-ddr50;
    };