i2c-pxa: Add polling transfer
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>
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