tree caa4523356468cdfc1a22ea3f5d4a133b97f9c09
parent 8abdf1c2a112edb8a696f693a7aac6060c0eae05
author Caesar Wang <wxt@rock-chips.com> 1464175303 +0800
committer Caesar Wang <wxt@rock-chips.com> 1464313196 +0800

rockchip: support rk3399 gpio driver

There are 5 groups of GPIO (GPIO0~GPIO4), totally have 122 GPIOs
on rk3399 platform.
The pull direction(pullup or pulldown) for all of GPIOs are
software-programmable.
At the moment, we add the gpio basic driver since reset or power off
the devices from gpio configuration for BL31.