FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/mmc/nvidia,tegra20-sdhci.txt

     * NVIDIA Tegra Secure Digital Host Controller
     
     This controller on Tegra family SoCs 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-tegra driver.
     
     Required properties:
    - compatible : should be one of:
      - "nvidia,tegra20-sdhci": for Tegra20
      - "nvidia,tegra30-sdhci": for Tegra30
      - "nvidia,tegra114-sdhci": for Tegra114
      - "nvidia,tegra124-sdhci": for Tegra124 and Tegra132
      - "nvidia,tegra210-sdhci": for Tegra210
      - "nvidia,tegra186-sdhci": for Tegra186
      - "nvidia,tegra194-sdhci": for Tegra194
    - clocks: For Tegra210, Tegra186 and Tegra194 must contain two entries.
              One for the module clock and one for the timeout clock.
              For all other Tegra devices, must contain a single entry for
              the module clock. See ../clocks/clock-bindings.txt for details.
    - clock-names: For Tegra210, Tegra186 and Tegra194 must contain the
                   strings 'sdhci' and 'tmclk' to represent the module and
                   the timeout clocks, respectively.
                   For all other Tegra devices must contain the string 'sdhci'
                   to represent the module clock.
    - resets : Must contain an entry for each entry in reset-names.
      See ../reset/reset.txt for details.
    - reset-names : Must include the following entries:
      - sdhci
    
    Optional properties:
    - power-gpios : Specify GPIOs for power control
    
    Example:
    
    sdhci@c8000200 {
            compatible = "nvidia,tegra20-sdhci";
            reg = <0xc8000200 0x200>;
            interrupts = <47>;
            clocks = <&tegra_car 14>;
            resets = <&tegra_car 14>;
            reset-names = "sdhci";
            cd-gpios = <&gpio 69 0>; /* gpio PI5 */
            wp-gpios = <&gpio 57 0>; /* gpio PH1 */
            power-gpios = <&gpio 155 0>; /* gpio PT3 */
            bus-width = <8>;
    };
    
    Optional properties for Tegra210, Tegra186 and Tegra194:
    - pinctrl-names, pinctrl-0, pinctrl-1 : Specify pad voltage
      configurations. Valid pinctrl-names are "sdmmc-3v3" and "sdmmc-1v8"
      for controllers supporting multiple voltage levels. The order of names
      should correspond to the pin configuration states in pinctrl-0 and
      pinctrl-1.
    - pinctrl-names : "sdmmc-3v3-drv" and "sdmmc-1v8-drv" are applicable for
      Tegra210 where pad config registers are in the pinmux register domain
      for pull-up-strength and pull-down-strength values configuration when
      using pads at 3V3 and 1V8 levels.
    - nvidia,only-1-8-v : The presence of this property indicates that the
      controller operates at a 1.8 V fixed I/O voltage.
    - nvidia,pad-autocal-pull-up-offset-3v3,
      nvidia,pad-autocal-pull-down-offset-3v3 : Specify drive strength
      calibration offsets for 3.3 V signaling modes.
    - nvidia,pad-autocal-pull-up-offset-1v8,
      nvidia,pad-autocal-pull-down-offset-1v8 : Specify drive strength
      calibration offsets for 1.8 V signaling modes.
    - nvidia,pad-autocal-pull-up-offset-3v3-timeout,
      nvidia,pad-autocal-pull-down-offset-3v3-timeout : Specify drive
      strength used as a fallback in case the automatic calibration times
      out on a 3.3 V signaling mode.
    - nvidia,pad-autocal-pull-up-offset-1v8-timeout,
      nvidia,pad-autocal-pull-down-offset-1v8-timeout : Specify drive
      strength used as a fallback in case the automatic calibration times
      out on a 1.8 V signaling mode.
    - nvidia,pad-autocal-pull-up-offset-sdr104,
      nvidia,pad-autocal-pull-down-offset-sdr104 : Specify drive strength
      calibration offsets for SDR104 mode.
    - nvidia,pad-autocal-pull-up-offset-hs400,
      nvidia,pad-autocal-pull-down-offset-hs400 : Specify drive strength
      calibration offsets for HS400 mode.
    - nvidia,default-tap : Specify the default inbound sampling clock
      trimmer value for non-tunable modes.
    - nvidia,default-trim : Specify the default outbound clock trimmer
      value.
    - nvidia,dqs-trim : Specify DQS trim value for HS400 timing
    
      Notes on the pad calibration pull up and pulldown offset values:
        - The property values are drive codes which are programmed into the
          PD_OFFSET and PU_OFFSET sections of the
          SDHCI_TEGRA_AUTO_CAL_CONFIG register.
        - A higher value corresponds to higher drive strength. Please refer
          to the reference manual of the SoC for correct values.
        - The SDR104 and HS400 timing specific values are used in
          corresponding modes if specified.
    
      Notes on tap and trim values:
        - The values are used for compensating trace length differences
          by adjusting the sampling point.
       - The values are programmed to the Vendor Clock Control Register.
         Please refer to the reference manual of the SoC for correct
         values.
       - The DQS trim values are only used on controllers which support
         HS400 timing. Only SDMMC4 on Tegra210 and Tegra 186 supports
         HS400.
   
   Example:
   sdhci@700b0000 {
           compatible = "nvidia,tegra124-sdhci";
           reg = <0x0 0x700b0000 0x0 0x200>;
           interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;
           clocks = <&tegra_car TEGRA210_CLK_SDMMC1>;
           clock-names = "sdhci";
           resets = <&tegra_car 14>;
           reset-names = "sdhci";
           pinctrl-names = "sdmmc-3v3", "sdmmc-1v8";
           pinctrl-0 = <&sdmmc1_3v3>;
           pinctrl-1 = <&sdmmc1_1v8>;
           nvidia,pad-autocal-pull-up-offset-3v3 = <0x00>;
           nvidia,pad-autocal-pull-down-offset-3v3 = <0x7d>;
           nvidia,pad-autocal-pull-up-offset-1v8 = <0x7b>;
           nvidia,pad-autocal-pull-down-offset-1v8 = <0x7b>;
           status = "disabled";
   };
   
   sdhci@700b0000 {
           compatible = "nvidia,tegra210-sdhci";
           reg = <0x0 0x700b0000 0x0 0x200>;
           interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;
           clocks = <&tegra_car TEGRA210_CLK_SDMMC1>,
                    <&tegra_car TEGRA210_CLK_SDMMC_LEGACY>;
           clock-names = "sdhci", "tmclk";
           resets = <&tegra_car 14>;
           reset-names = "sdhci";
           pinctrl-names = "sdmmc-3v3", "sdmmc-1v8";
           pinctrl-0 = <&sdmmc1_3v3>;
           pinctrl-1 = <&sdmmc1_1v8>;
           nvidia,pad-autocal-pull-up-offset-3v3 = <0x00>;
           nvidia,pad-autocal-pull-down-offset-3v3 = <0x7d>;
           nvidia,pad-autocal-pull-up-offset-1v8 = <0x7b>;
           nvidia,pad-autocal-pull-down-offset-1v8 = <0x7b>;
           status = "disabled";
   };

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