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Diffstat (limited to 'kernel/Documentation/devicetree/bindings/phy/nvidia,tegra20-usb-phy.txt')
| -rw-r--r-- | kernel/Documentation/devicetree/bindings/phy/nvidia,tegra20-usb-phy.txt | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/kernel/Documentation/devicetree/bindings/phy/nvidia,tegra20-usb-phy.txt b/kernel/Documentation/devicetree/bindings/phy/nvidia,tegra20-usb-phy.txt new file mode 100644 index 000000000..a9aa79fb9 --- /dev/null +++ b/kernel/Documentation/devicetree/bindings/phy/nvidia,tegra20-usb-phy.txt @@ -0,0 +1,72 @@ +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 (cdev2). + 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 |