linux/Documentation/devicetree/bindings/mmc/mtk-sd.yaml

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

title: MTK MSDC Storage Host Controller Binding

maintainers:
  - Chaotian Jing <chaotian.jing@mediatek.com>
  - Wenbin Mei <wenbin.mei@mediatek.com>

allOf:
  - $ref: mmc-controller.yaml#

properties:
  compatible:
    oneOf:
      - enum:
          - mediatek,mt2701-mmc
          - mediatek,mt2712-mmc
          - mediatek,mt6779-mmc
          - mediatek,mt7620-mmc
          - mediatek,mt7622-mmc
          - mediatek,mt8135-mmc
          - mediatek,mt8173-mmc
          - mediatek,mt8183-mmc
          - mediatek,mt8516-mmc
      - items:
          - const: mediatek,mt7623-mmc
          - const: mediatek,mt2701-mmc
      - items:
          - const: mediatek,mt8192-mmc
          - const: mediatek,mt8183-mmc
      - items:
          - const: mediatek,mt8195-mmc
          - const: mediatek,mt8183-mmc

  reg:
    maxItems: 1

  clocks:
    description:
      Should contain phandle for the clock feeding the MMC controller.
    minItems: 2
    items:
      - description: source clock (required).
      - description: HCLK which used for host (required).
      - description: independent source clock gate (required for MT2712).
      - description: bus clock used for internal register access (required for MT2712 MSDC0/3).
      - description: msdc subsys clock gate (required for MT8192).
      - description: peripheral bus clock gate (required for MT8192).
      - description: AXI bus clock gate (required for MT8192).
      - description: AHB bus clock gate (required for MT8192).

  clock-names:
    minItems: 2
    items:
      - const: source
      - const: hclk
      - const: source_cg
      - const: bus_clk
      - const: sys_cg
      - const: pclk_cg
      - const: axi_cg
      - const: ahb_cg

  interrupts:
    maxItems: 1

  pinctrl-names:
    items:
      - const: default
      - const: state_uhs

  pinctrl-0:
    description:
      should contain default/high speed pin ctrl.
    maxItems: 1

  pinctrl-1:
    description:
      should contain uhs mode pin ctrl.
    maxItems: 1

  assigned-clocks:
    description:
      PLL of the source clock.
    maxItems: 1

  assigned-clock-parents:
    description:
      parent of source clock, used for HS400 mode to get 400Mhz source clock.
    maxItems: 1

  hs400-ds-delay:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      HS400 DS delay setting.
    minimum: 0
    maximum: 0xffffffff

  mediatek,hs200-cmd-int-delay:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      HS200 command internal delay setting.
      This field has total 32 stages.
      The value is an integer from 0 to 31.
    minimum: 0
    maximum: 31

  mediatek,hs400-cmd-int-delay:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      HS400 command internal delay setting.
      This field has total 32 stages.
      The value is an integer from 0 to 31.
    minimum: 0
    maximum: 31

  mediatek,hs400-cmd-resp-sel-rising:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      HS400 command response sample selection.
      If present, HS400 command responses are sampled on rising edges.
      If not present, HS400 command responses are sampled on falling edges.

  mediatek,hs400-ds-dly3:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      Gear of the third delay line for DS for input data latch in data
      pad macro, there are 32 stages from 0 to 31.
      For different corner IC, the time is different about one step, it is
      about 100ps.
      The value is confirmed by doing scan and calibration to find a best
      value with corner IC and it is valid only for HS400 mode.
    minimum: 0
    maximum: 31

  mediatek,latch-ck:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      Some SoCs do not support enhance_rx, need set correct latch-ck to avoid
      data crc error caused by stop clock(fifo full) Valid range = [0:0x7].
      if not present, default value is 0.
      applied to compatible "mediatek,mt2701-mmc".
    minimum: 0
    maximum: 7

  resets:
    maxItems: 1

  reset-names:
    const: hrst

required:
  - compatible
  - reg
  - interrupts
  - clocks
  - clock-names
  - pinctrl-names
  - pinctrl-0
  - pinctrl-1
  - vmmc-supply
  - vqmmc-supply

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/irq.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/clock/mt8173-clk.h>
    mmc0: mmc@11230000 {
        compatible = "mediatek,mt8173-mmc";
        reg = <0x11230000 0x1000>;
        interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_LOW>;
        vmmc-supply = <&mt6397_vemc_3v3_reg>;
        vqmmc-supply = <&mt6397_vio18_reg>;
        clocks = <&pericfg CLK_PERI_MSDC30_0>,
                 <&topckgen CLK_TOP_MSDC50_0_H_SEL>;
        clock-names = "source", "hclk";
        pinctrl-names = "default", "state_uhs";
        pinctrl-0 = <&mmc0_pins_default>;
        pinctrl-1 = <&mmc0_pins_uhs>;
        assigned-clocks = <&topckgen CLK_TOP_MSDC50_0_SEL>;
        assigned-clock-parents = <&topckgen CLK_TOP_MSDCPLL_D2>;
        hs400-ds-delay = <0x14015>;
        mediatek,hs200-cmd-int-delay = <26>;
        mediatek,hs400-cmd-int-delay = <14>;
        mediatek,hs400-cmd-resp-sel-rising;
    };

...