FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/mmc/fsl-imx-esdhc.txt

     * Freescale Enhanced Secure Digital Host Controller (eSDHC) for i.MX
     
     The Enhanced Secure Digital Host Controller on Freescale i.MX family
     provides an interface for MMC, SD, and SDIO types of memory cards.
     
     This file documents differences between the core properties described
     by mmc.txt and the properties used by the sdhci-esdhc-imx driver.
     
     Required properties:
    - compatible : Should be "fsl,<chip>-esdhc", the supported chips include
                   "fsl,imx25-esdhc"
                   "fsl,imx35-esdhc"
                   "fsl,imx51-esdhc"
                   "fsl,imx53-esdhc"
                   "fsl,imx6q-usdhc"
                   "fsl,imx6sl-usdhc"
                   "fsl,imx6sx-usdhc"
                   "fsl,imx6ull-usdhc"
                   "fsl,imx7d-usdhc"
                   "fsl,imx7ulp-usdhc"
                   "fsl,imx8mq-usdhc"
                   "fsl,imx8mm-usdhc"
                   "fsl,imx8mn-usdhc"
                   "fsl,imx8mp-usdhc"
                   "fsl,imx8qm-usdhc"
                   "fsl,imx8qxp-usdhc"
    
    Optional properties:
    - fsl,wp-controller : Indicate to use controller internal write protection
    - fsl,delay-line : Specify the number of delay cells for override mode.
      This is used to set the clock delay for DLL(Delay Line) on override mode
      to select a proper data sampling window in case the clock quality is not good
      due to signal path is too long on the board. Please refer to eSDHC/uSDHC
      chapter, DLL (Delay Line) section in RM for details.
    - voltage-ranges : Specify the voltage range in case there are software
      transparent level shifters on the outputs of the controller. Two cells are
      required, first cell specifies minimum slot voltage (mV), second cell
      specifies maximum slot voltage (mV). Several ranges could be specified.
    - fsl,tuning-start-tap: Specify the start dealy cell point when send first CMD19
      in tuning procedure.
    - fsl,tuning-step: Specify the increasing delay cell steps in tuning procedure.
      The uSDHC use one delay cell as default increasing step to do tuning process.
      This property allows user to change the tuning step to more than one delay
      cells which is useful for some special boards or cards when the default
      tuning step can't find the proper delay window within limited tuning retries.
    - fsl,strobe-dll-delay-target: Specify the strobe dll control slave delay target.
      This delay target programming host controller loopback read clock, and this
      property allows user to change the delay target for the strobe input read clock.
      If not use this property, driver default set the delay target to value 7.
      Only eMMC HS400 mode need to take care of this property.
    
    Examples:
    
    esdhc@70004000 {
            compatible = "fsl,imx51-esdhc";
            reg = <0x70004000 0x4000>;
            interrupts = <1>;
            fsl,wp-controller;
    };
    
    esdhc@70008000 {
            compatible = "fsl,imx51-esdhc";
            reg = <0x70008000 0x4000>;
            interrupts = <2>;
            cd-gpios = <&gpio1 6 0>; /* GPIO1_6 */
            wp-gpios = <&gpio1 5 0>; /* GPIO1_5 */
    };

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