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




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Based on kernel version 3.9. Page generated on 2013-05-02 23:02 EST.

1	Tegra SOC USB controllers
2	
3	The device node for a USB controller that is part of a Tegra
4	SOC is as described in the document "Open Firmware Recommended
5	Practice : Universal Serial Bus" with the following modifications
6	and additions :
7	
8	Required properties :
9	 - compatible : Should be "nvidia,tegra20-ehci" for USB controllers
10	   used in host mode.
11	 - phy_type : Should be one of "ulpi" or "utmi".
12	 - nvidia,vbus-gpio : If present, specifies a gpio that needs to be
13	   activated for the bus to be powered.
14	 - nvidia,phy : phandle of the PHY instance, the controller is connected to.
15	
16	Required properties for phy_type == ulpi:
17	  - nvidia,phy-reset-gpio : The GPIO used to reset the PHY.
18	
19	Optional properties:
20	  - dr_mode : dual role mode. Indicates the working mode for
21	   nvidia,tegra20-ehci compatible controllers.  Can be "host", "peripheral",
22	   or "otg".  Default to "host" if not defined for backward compatibility.
23	      host means this is a host controller
24	      peripheral means it is device controller
25	      otg means it can operate as either ("on the go")
26	  - nvidia,has-legacy-mode : boolean indicates whether this controller can
27	    operate in legacy mode (as APX 2500 / 2600). In legacy mode some
28	    registers are accessed through the APB_MISC base address instead of
29	    the USB controller. Since this is a legacy issue it probably does not
30	    warrant a compatible string of its own.
31	  - nvidia,needs-double-reset : boolean is to be set for some of the Tegra2
32	    USB ports, which need reset twice due to hardware issues.
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