[PATCH] ARM: dts: pxa: add pincontrol helpers

Robert Jarzmik [off-list ref] writes:

Add 3 helpers so that pincontrol definitions for pxa25x and pxa27x are
easier, and can be easily converted from old mfp mach-pxa code to
devicetree.

As this is exactly the same patch sent out for review July the 7th, queued to
pxa/dt.

--
Robert