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

     Tegra SOC USB PHY
     
     The device node for Tegra SOC USB PHY:
     
     Required properties :
      - compatible : For Tegra20, must contain "nvidia,tegra20-usb-phy".
        For Tegra30, must contain "nvidia,tegra30-usb-phy".  Otherwise, must contain
        "nvidia,<chip>-usb-phy" plus at least one of the above, where <chip> is
        tegra114, tegra124, tegra132, or tegra210.
     - reg : Defines the following set of registers, in the order listed:
       - The PHY's own register set.
         Always present.
       - The register set of the PHY containing the UTMI pad control registers.
         Present if-and-only-if phy_type == utmi.
     - phy_type : Should be one of "utmi", "ulpi" or "hsic".
     - clocks : Defines the clocks listed in the clock-names property.
     - clock-names : The following clock names must be present:
       - reg: The clock needed to access the PHY's own registers. This is the
         associated EHCI controller's clock. Always present.
       - pll_u: PLL_U. Always present.
       - timer: The timeout clock (clk_m). Present if phy_type == utmi.
       - utmi-pads: The clock needed to access the UTMI pad control registers.
         Present if phy_type == utmi.
       - ulpi-link: The clock Tegra provides to the ULPI PHY (usually pad DAP_MCLK2
         with pad group aka "nvidia,pins" cdev2 and pin mux option config aka
         "nvidia,function" pllp_out4).
         Present if phy_type == ulpi, and ULPI link mode is in use.
     - resets : Must contain an entry for each entry in reset-names.
       See ../reset/reset.txt for details.
     - reset-names : Must include the following entries:
       - usb: The PHY's own reset signal.
       - utmi-pads: The reset of the PHY containing the chip-wide UTMI pad control
         registers. Required even if phy_type == ulpi.
    
    Required properties for phy_type == ulpi:
      - nvidia,phy-reset-gpio : The GPIO used to reset the PHY.
    
    Required PHY timing params for utmi phy, for all chips:
      - nvidia,hssync-start-delay : Number of 480 Mhz clock cycles to wait before
        start of sync launches RxActive
      - nvidia,elastic-limit : Variable FIFO Depth of elastic input store
      - nvidia,idle-wait-delay : Number of 480 Mhz clock cycles of idle to wait
        before declare IDLE.
      - nvidia,term-range-adj : Range adjusment on terminations
      - Either one of the following for HS driver output control:
        - nvidia,xcvr-setup : integer, uses the provided value.
        - nvidia,xcvr-setup-use-fuses : boolean, indicates that the value is read
          from the on-chip fuses
        If both are provided, nvidia,xcvr-setup-use-fuses takes precedence.
      - nvidia,xcvr-lsfslew : LS falling slew rate control.
      - nvidia,xcvr-lsrslew :  LS rising slew rate control.
    
    Required PHY timing params for utmi phy, only on Tegra30 and above:
      - nvidia,xcvr-hsslew : HS slew rate control.
      - nvidia,hssquelch-level : HS squelch detector level.
      - nvidia,hsdiscon-level : HS disconnect detector level.
    
    Optional properties:
      - nvidia,has-legacy-mode : boolean indicates whether this controller can
        operate in legacy mode (as APX 2500 / 2600). In legacy mode some
        registers are accessed through the APB_MISC base address instead of
        the USB controller.
      - nvidia,is-wired : boolean. Indicates whether we can do certain kind of power
        optimizations for the devices that are always connected. e.g. modem.
      - dr_mode : dual role mode. Indicates the working mode for the PHY. Can be
        "host", "peripheral", or "otg". Defaults to "host" if not defined.
          host means this is a host controller
          peripheral means it is device controller
          otg means it can operate as either ("on the go")
      - nvidia,has-utmi-pad-registers : boolean indicates whether this controller
        contains the UTMI pad control registers common to all USB controllers.
    
    VBUS control (required for dr_mode == otg, optional for dr_mode == host):
      - vbus-supply: regulator for VBUS

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