This isn't an exhaustive list, but you should add new prefixes to it before
using them to avoid name-space collisions.
+active-semi Active-Semi International Inc
ad Avionic Design GmbH
adi Analog Devices, Inc.
aeroflexgaisler Aeroflex Gaisler AB
fsl Freescale Semiconductor
GEFanuc GE Fanuc Intelligent Platforms Embedded Systems, Inc.
gef GE Fanuc Intelligent Platforms Embedded Systems, Inc.
+gmt Global Mixed-mode Technology, Inc.
hisilicon Hisilicon Limited.
hp Hewlett Packard
ibm International Business Machines (IBM)
idt Integrated Device Technologies, Inc.
img Imagination Technologies Ltd.
intercontrol Inter Control Group
+lg LG Corporation
linux Linux-specific binding
lsi LSI Corp. (LSI Logic)
marvell Marvell Technology Group Ltd.