FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/usb/ci-hdrc-usb2.txt

     * USB2 ChipIdea USB controller for ci13xxx
     
     Required properties:
     - compatible: should be one of:
             "fsl,imx23-usb"
             "fsl,imx27-usb"
             "fsl,imx28-usb"
             "fsl,imx6q-usb"
             "fsl,imx6sl-usb"
            "fsl,imx6sx-usb"
            "fsl,imx6ul-usb"
            "fsl,imx7d-usb"
            "fsl,imx7ulp-usb"
            "lsi,zevio-usb"
            "qcom,ci-hdrc"
            "chipidea,usb2"
            "xlnx,zynq-usb-2.20a"
            "nvidia,tegra20-udc"
            "nvidia,tegra30-udc"
            "nvidia,tegra114-udc"
            "nvidia,tegra124-udc"
    - reg: base address and length of the registers
    - interrupts: interrupt for the USB controller
    
    Recommended properies:
    - phy_type: the type of the phy connected to the core. Should be one
      of "utmi", "utmi_wide", "ulpi", "serial" or "hsic". Without this
      property the PORTSC register won't be touched.
    - dr_mode: One of "host", "peripheral" or "otg". Defaults to "otg"
    
    Deprecated properties:
    - usb-phy:      phandle for the PHY device. Use "phys" instead.
    - fsl,usbphy: phandle of usb phy that connects to the port. Use "phys" instead.
    
    Optional properties:
    - clocks: reference to the USB clock
    - phys: reference to the USB PHY
    - phy-names: should be "usb-phy"
    - vbus-supply: reference to the VBUS regulator
    - maximum-speed: limit the maximum connection speed to "full-speed".
    - tpl-support: TPL (Targeted Peripheral List) feature for targeted hosts
    - itc-setting: interrupt threshold control register control, the setting
      should be aligned with ITC bits at register USBCMD.
    - ahb-burst-config: it is vendor dependent, the required value should be
      aligned with AHBBRST at SBUSCFG, the range is from 0x0 to 0x7. This
      property is used to change AHB burst configuration, check the chipidea
      spec for meaning of each value. If this property is not existed, it
      will use the reset value.
    - tx-burst-size-dword: it is vendor dependent, the tx burst size in dword
      (4 bytes), This register represents the maximum length of a the burst
      in 32-bit words while moving data from system memory to the USB
      bus, the value of this property will only take effect if property
      "ahb-burst-config" is set to 0, if this property is missing the reset
      default of the hardware implementation will be used.
    - rx-burst-size-dword: it is vendor dependent, the rx burst size in dword
      (4 bytes), This register represents the maximum length of a the burst
      in 32-bit words while moving data from the USB bus to system memory,
      the value of this property will only take effect if property
      "ahb-burst-config" is set to 0, if this property is missing the reset
      default of the hardware implementation will be used.
    - extcon: phandles to external connector devices. First phandle should point to
      external connector, which provide "USB" cable events, the second should point
      to external connector device, which provide "USB-HOST" cable events. If one
      of the external connector devices is not required, empty <0> phandle should
      be specified.
    - phy-clkgate-delay-us: the delay time (us) between putting the PHY into
      low power mode and gating the PHY clock.
    - non-zero-ttctrl-ttha: after setting this property, the value of register
      ttctrl.ttha will be 0x7f; if not, the value will be 0x0, this is the default
      value. It needs to be very carefully for setting this property, it is
      recommended that consult with your IC engineer before setting this value.
      On the most of chipidea platforms, the "usage_tt" flag at RTL is 0, so this
      property only affects siTD.
      If this property is not set, the max packet size is 1023 bytes, and if
      the total of packet size for pervious transactions are more than 256 bytes,
      it can't accept any transactions within this frame. The use case is single
      transaction, but higher frame rate.
      If this property is set, the max packet size is 188 bytes, it can handle
      more transactions than above case, it can accept transactions until it
      considers the left room size within frame is less than 188 bytes, software
      needs to make sure it does not send more than 90%
      maximum_periodic_data_per_frame. The use case is multiple transactions, but
      less frame rate.
    - mux-controls: The mux control for toggling host/device output of this
      controller. It's expected that a mux state of 0 indicates device mode and a
      mux state of 1 indicates host mode.
    - mux-control-names: Shall be "usb_switch" if mux-controls is specified.
    - pinctrl-names: Names for optional pin modes in "default", "host", "device".
      In case of HSIC-mode, "idle" and "active" pin modes are mandatory. In this
      case, the "idle" state needs to pull down the data and strobe pin
      and the "active" state needs to pull up the strobe pin.
    - pinctrl-n: alternate pin modes
    
    i.mx specific properties
    - fsl,usbmisc: phandler of non-core register device, with one
      argument that indicate usb controller index
    - disable-over-current: disable over current detect
    - over-current-active-low: over current signal polarity is active low.
    - over-current-active-high: over current signal polarity is active high.
     It's recommended to specify the over current polarity.
   - power-active-high: power signal polarity is active high
   - external-vbus-divider: enables off-chip resistor divider for Vbus
   - samsung,picophy-pre-emp-curr-control: HS Transmitter Pre-Emphasis Current
     Control. This signal controls the amount of current sourced to the
     USB_OTG*_DP and USB_OTG*_DN pins after a J-to-K or K-to-J transition.
     The range is from 0x0 to 0x3, the default value is 0x1.
     Details can refer to TXPREEMPAMPTUNE0 bits of USBNC_n_PHY_CFG1.
   - samsung,picophy-dc-vol-level-adjust: HS DC Voltage Level Adjustment.
     Adjust the high-speed transmitter DC level voltage.
     The range is from 0x0 to 0xf, the default value is 0x3.
     Details can refer to TXVREFTUNE0 bits of USBNC_n_PHY_CFG1.
   
   Example:
   
           usb@f7ed0000 {
                   compatible = "chipidea,usb2";
                   reg = <0xf7ed0000 0x10000>;
                   interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
                   clocks = <&chip CLKID_USB0>;
                   phys = <&usb_phy0>;
                   phy-names = "usb-phy";
                   vbus-supply = <&reg_usb0_vbus>;
                   itc-setting = <0x4>; /* 4 micro-frames */
                    /* Incremental burst of unspecified length */
                   ahb-burst-config = <0x0>;
                   tx-burst-size-dword = <0x10>; /* 64 bytes */
                   rx-burst-size-dword = <0x10>;
                   extcon = <0>, <&usb_id>;
                   phy-clkgate-delay-us = <400>;
                   mux-controls = <&usb_switch>;
                   mux-control-names = "usb_switch";
           };
   
   Example for HSIC:
   
           usb@2184400 {
                   compatible = "fsl,imx6q-usb", "fsl,imx27-usb";
                   reg = <0x02184400 0x200>;
                   interrupts = <0 41 IRQ_TYPE_LEVEL_HIGH>;
                   clocks = <&clks IMX6QDL_CLK_USBOH3>;
                   fsl,usbphy = <&usbphynop1>;
                   fsl,usbmisc = <&usbmisc 2>;
                   phy_type = "hsic";
                   dr_mode = "host";
                   ahb-burst-config = <0x0>;
                   tx-burst-size-dword = <0x10>;
                   rx-burst-size-dword = <0x10>;
                   pinctrl-names = "idle", "active";
                   pinctrl-0 = <&pinctrl_usbh2_idle>;
                   pinctrl-1 = <&pinctrl_usbh2_active>;
                   #address-cells = <1>;
                   #size-cells = <0>;
   
                   usbnet: ethernet@1 {
                           compatible = "usb424,9730";
                           reg = <1>;
                   };
           };

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