Documentation/devicetree/bindings/usb/nvidia,tegra20-usb-phy.txt

   1 Tegra SOC USB PHY
   2
   3 The device node for Tegra SOC USB PHY:
   4
   5 Required 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
  24 Required properties for phy_type == ulpi:
  25   - nvidia,phy-reset-gpio : The GPIO used to reset the PHY.
  26
  27 Required 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
  38 Optional 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
  51 VBUS control (required for dr_mode == otg, optional for dr_mode == host):
  52   - vbus-supply: regulator for VBUS