linux/Documentation/devicetree/bindings/usb/nvidia,tegra20-usb-phy.txt
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   1Tegra SOC USB PHY
   2
   3The device node for Tegra SOC USB PHY:
   4
   5Required properties :
   6 - compatible : Should be "nvidia,tegra20-usb-phy".
   7 - reg : Defines the following set of registers, in the order listed:
   8   - The PHY's own register set.
   9     Always present.
  10   - The register set of the PHY containing the UTMI pad control registers.
  11     Present if-and-only-if phy_type == utmi.
  12 - phy_type : Should be one of "utmi", "ulpi" or "hsic".
  13 - clocks : Defines the clocks listed in the clock-names property.
  14 - clock-names : The following clock names must be present:
  15   - reg: The clock needed to access the PHY's own registers. This is the
  16     associated EHCI controller's clock. Always present.
  17   - pll_u: PLL_U. Always present.
  18   - timer: The timeout clock (clk_m). Present if phy_type == utmi.
  19   - utmi-pads: The clock needed to access the UTMI pad control registers.
  20     Present if phy_type == utmi.
  21   - ulpi-link: The clock Tegra provides to the ULPI PHY (cdev2).
  22     Present if phy_type == ulpi, and ULPI link mode is in use.
  23
  24Required properties for phy_type == ulpi:
  25  - nvidia,phy-reset-gpio : The GPIO used to reset the PHY.
  26
  27Required PHY timing params for utmi phy:
  28  - nvidia,hssync-start-delay : Number of 480 Mhz clock cycles to wait before
  29    start of sync launches RxActive
  30  - nvidia,elastic-limit : Variable FIFO Depth of elastic input store
  31  - nvidia,idle-wait-delay : Number of 480 Mhz clock cycles of idle to wait
  32    before declare IDLE.
  33  - nvidia,term-range-adj : Range adjusment on terminations
  34  - nvidia,xcvr-setup : HS driver output control
  35  - nvidia,xcvr-lsfslew : LS falling slew rate control.
  36  - nvidia,xcvr-lsrslew :  LS rising slew rate control.
  37
  38Optional properties:
  39  - nvidia,has-legacy-mode : boolean indicates whether this controller can
  40    operate in legacy mode (as APX 2500 / 2600). In legacy mode some
  41    registers are accessed through the APB_MISC base address instead of
  42    the USB controller.
  43  - nvidia,is-wired : boolean. Indicates whether we can do certain kind of power
  44    optimizations for the devices that are always connected. e.g. modem.
  45  - dr_mode : dual role mode. Indicates the working mode for the PHY. Can be
  46    "host", "peripheral", or "otg". Defaults to "host" if not defined.
  47      host means this is a host controller
  48      peripheral means it is device controller
  49      otg means it can operate as either ("on the go")
  50
  51Required properties for dr_mode == otg:
  52  - vbus-supply: regulator for VBUS
  53