tree 6eaaacf60a8d96c7f46215d06a2fbf62ada3b311
parent fd8389749464513988091f51ab59c1c0aeb164ee
author Simon Glass <sjg@chromium.org> 1457317672 -0700
committer Bin Meng <bmeng.cn@gmail.com> 1458181643 +0800

pci: Add functions to update PCI configuration registers

It is common to read a config register value, clear and set some bits, then
write back the updated value. Add functions to do this in one step, for
convenience.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>