FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/mmc/exynos-dw-mshc.txt

     * Samsung Exynos specific extensions to the Synopsys Designware Mobile
       Storage Host Controller
     
     The Synopsys designware mobile storage host controller is used to interface
     a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
     differences between the core Synopsys dw mshc controller properties described
     by synopsys-dw-mshc.txt and the properties used by the Samsung Exynos specific
     extensions to the Synopsys Designware Mobile Storage Host Controller.
     
    Required Properties:
    
    * compatible: should be
            - "samsung,exynos4210-dw-mshc": for controllers with Samsung Exynos4210
              specific extensions.
            - "samsung,exynos4412-dw-mshc": for controllers with Samsung Exynos4412
              specific extensions.
            - "samsung,exynos5250-dw-mshc": for controllers with Samsung Exynos5250
              specific extensions.
            - "samsung,exynos5420-dw-mshc": for controllers with Samsung Exynos5420
              specific extensions.
            - "samsung,exynos7-dw-mshc": for controllers with Samsung Exynos7
              specific extensions.
            - "samsung,exynos7-dw-mshc-smu": for controllers with Samsung Exynos7
              specific extensions having an SMU.
            - "axis,artpec8-dw-mshc": for controllers with ARTPEC-8 specific
              extensions.
    
    * samsung,dw-mshc-ciu-div: Specifies the divider value for the card interface
      unit (ciu) clock. This property is applicable only for Exynos5 SoC's and
      ignored for Exynos4 SoC's. The valid range of divider value is 0 to 7.
    
    * samsung,dw-mshc-sdr-timing: Specifies 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. Refer notes below for the order of the cells and the
      valid values.
    
    * samsung,dw-mshc-ddr-timing: Specifies 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. Refer notes below for the order of the cells and the
      valid values.
    * samsung,dw-mshc-hs400-timing: Specifies the value of CIU TX and RX clock phase
      shift value for hs400 mode operation.
    
      Notes for the sdr-timing and ddr-timing values:
    
        The order of the cells should be
          - First Cell: CIU clock phase shift value for tx mode.
          - Second Cell: CIU clock phase shift value for rx mode.
    
        Valid values for SDR and DDR CIU clock timing for Exynos5250:
          - 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.
    
    * samsung,read-strobe-delay: RCLK (Data strobe) delay to control HS400 mode
      (Latency value for delay line in Read path)
    
    Required properties for a slot (Deprecated - Recommend to use one slot per host):
    
    * gpios: specifies a list of gpios used for command, clock and data bus. The
      first gpio is the command line and the second gpio is the clock line. The
      rest of the gpios (depending on the bus-width property) are the data lines in
      no particular order. The format of the gpio specifier depends on the gpio
      controller.
    (Deprecated - Refer to Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt)
    
    Example:
    
      The MSHC controller node can be split into two portions, SoC specific and
      board specific portions as listed below.
    
            dwmmc0@12200000 {
                    compatible = "samsung,exynos5250-dw-mshc";
                    reg = <0x12200000 0x1000>;
                    interrupts = <0 75 0>;
                    #address-cells = <1>;
                    #size-cells = <0>;
            };
    
            dwmmc0@12200000 {
                    cap-mmc-highspeed;
                    cap-sd-highspeed;
                    broken-cd;
                    fifo-depth = <0x80>;
                    card-detect-delay = <200>;
                    samsung,dw-mshc-ciu-div = <3>;
                    samsung,dw-mshc-sdr-timing = <2 3>;
                    samsung,dw-mshc-ddr-timing = <1 2>;
                    samsung,dw-mshc-hs400-timing = <0 2>;
                    samsung,read-strobe-delay = <90>;
                    bus-width = <8>;
            };

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