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The ISP1704/1707 chip can be put to full power down state by asserting the CHIP_SEL line. This patch enables platform or board specific hooks to put the device into power down mode in case not needed. This patch is a preparation for enabling this powering routine in n900 (rx-51) devices. Thanks to Heikki Krogerus for helping out with the patch. Signed-off-by: Kalle Jokiniemi <[email protected]> Acked-By: Heikki Krogerus <[email protected]> Signed-off-by: Anton Vorontsov <[email protected]>