K 10
svn:author
V 5
gonzo
K 8
svn:date
V 27
2018-05-15T02:26:50.484781Z
K 7
svn:log
V 743
MFC r331906:

Approved by:	re (gjb)

Fix accidental USB port resets by GPIO on Zynq/Zedboard boards

The Zynq/Zedboard GPIO driver attempts to tri-state all GPIO pins on
boot up but the order in which I reset the hardware can cause the pins
to be briefly held low before being tri-stated.  This is a problem on
boards that use GPIO pins to reset devices.

In particular, the Zybo and ZC-706 boards use a GPIO pin as a USB PHY
reset.  If U-boot enables the USB port before booting the kernel, the
GPIO driver attach causes a glitch on the USB PHY reset and the USB
port loses power.  My fix is to have the GPIO driver leave the pins in
whatever configuration U-boot placed them.

PR:		225713
Submitted by:	Thomas Skibo <thoma555-bsd@yahoo.com>

END