mtd: onenand: add new callback for bufferram read
This patch adds a new callback for the underlying drivers, which is called instead of accessing the buffer ram directly. This callback will be used by Samsung OneNAND driver to implement DMA transfers on S5PC110 SoC. Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com> Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
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