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fdt: Add tegra-usb bindings file from linux 

This file is taken from the Linux mailing list.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Simon Glass 2012-02-27 10:52:41 +00:00 committed by Albert ARIBAUD
parent 849df712a0
commit b257464b1c
1 changed files with 13 additions and 0 deletions
doc/device-tree-bindings/usb
tegra-usb.txt

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doc/device-tree-bindings/usb/tegra-usb.txt Normal file
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Tegra SOC USB controllers
The device node for a USB controller that is part of a Tegra
SOC is as described in the document "Open Firmware Recommended
Practice : Universal Serial Bus" with the following modifications
and additions :
Required properties :
- compatible : Should be "nvidia,tegra20-ehci" for USB controllers
used in host mode.
- phy_type : Should be one of "ulpi" or "utmi".
- nvidia,vbus-gpio : If present, specifies a gpio that needs to be
activated for the bus to be powered.