Some devices have no phandle since they are not referenced in the
device tree, but they are still registered in our OFW framework.
These then tend to have a phandle 0. If we are trying to lookup
a d

Some devices have no phandle since they are not referenced in the
device tree, but they are still registered in our OFW framework.
These then tend to have a phandle 0. If we are trying to lookup
a device by phandle, we should explicitly check for phandle 0 and
bail, since otherwise it is possible that we falsely match that
phandle and return a device.

ok kettenis@

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Introduce OF_getindex() API and use it to replace multiple instances of
pretty much identical code.

ok visa@

Add a generic pinctrl "framework".

ok patrick@