Add polling I2C transfer implementation for PXA I2C. This is needed
for cases where I2C transactions have to occur at times interrups are
disabled.
Signed-off-by: NMike Rapoport <mike@compulab.co.il>
Acked-by: Neric miao <eric.miao@marvell.com>
Signed-off-by: NJean Delvare <khali@linux-fr.org>