tree a8f8d816ae62a52b98f3636261f4f0ab0594771b
parent 0c093523c40c67aed00fd7d737c9d468880a9da0
author Stephen Warren <swarren@nvidia.com> 1453831182 -0700
committer Simon Glass <sjg@chromium.org> 1454040083 -0700

ARM: tegra: shut down USB device controller at boot

When loading U-Boot into RAM over USB protocols using tools such as
tegrarcm or L4T's exec-uboot.sh/tegraflash.py, Tegra's USB device
mode controller is initialized and enumerated by the host PC running
the tool. Unfortunately, these tools do not shut down the USB
controller before executing the downloaded code, and so the host PC
does not "de-enumerate" the USB device. This patch implements optional
code to shut down the USB controller when U-Boot boots to avoid leaving
a stale USB device present.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>