No, there is no ready to use reference design other than i.MX31 PDK:
However, the up-to-date MMPF0100/MMPF0200 series PMICs:
http://www.nxp.com/products/power-management/pmics/configurable-pmics-pf-series:CPMICSPFS
are very flexibly configurable and highly customizable, so, they are suitable
for use as the companion PMICs for all existing i.MX series processors, including
the i.MX31 one.
Have a great day,
Artur
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