[ARM] pxa/hx4700: add Maxim 1587A voltage regulator
On this board, the PXA270 CPU voltage VCC_CORE is provided by a Maxim 1587A voltage regulator configured to provide 1.55 V maximum voltage for 624 MHz operation. Signed-off-by: NPhilipp Zabel <philipp.zabel@gmail.com> Signed-off-by: NEric Miao <eric.miao@marvell.com>
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