tree 0ed6d6aa607ae30ef5a7f5fc582a981764393b53
parent 15ff4bcbb5137cc47ef81f57c525c4cbbeca57d3
author Caesar Wang <wxt@rock-chips.com> 1464173325 +0800
committer Caesar Wang <wxt@rock-chips.com> 1464313196 +0800

gpio: support gpio set/get pull status

On some platform gpio can set/get pull status when input, add these
function so we can set/get gpio pull status when need it. And they are
optional function.