From 3f2546b2ef55b661fd8dd69682b38992225e86f6 Mon Sep 17 00:00:00 2001 From: fishsoupisgood Date: Mon, 29 Apr 2019 01:17:54 +0100 Subject: Initial import of qemu-2.4.1 --- .../doc/device-tree-bindings/usb/tegra-usb.txt | 25 ++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 roms/u-boot/doc/device-tree-bindings/usb/tegra-usb.txt (limited to 'roms/u-boot/doc/device-tree-bindings/usb') diff --git a/roms/u-boot/doc/device-tree-bindings/usb/tegra-usb.txt b/roms/u-boot/doc/device-tree-bindings/usb/tegra-usb.txt new file mode 100644 index 00000000..5282d44a --- /dev/null +++ b/roms/u-boot/doc/device-tree-bindings/usb/tegra-usb.txt @@ -0,0 +1,25 @@ +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. + +Optional properties: + - dr_mode : dual role mode. Indicates the working mode for + nvidia,tegra20-ehci compatible controllers. Can be "host", "peripheral", + or "otg". Default to "host" if not defined for backward compatibility. + 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-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. -- cgit v1.2.3