This patchset switches omap2-mcspi from handling DMA mapping internally to using the mechanism built into the SPI framework. However, this is slightly complex since some OMAP SoCs have a quirk that needs to be handled. In the driver on certain OMAP SOCs if certain conditions are met the DMA should transfer one or two less elements when reading from the SPI. The remaining bytes are read in CPU mode. Sg_split is used to implement this quirk without altering the original sgl. Note: The first patch looks to already have been accepted. V2 changes: Save page_link value if page_link doesn't point to chained sg_list v3 changes: Switch from using custom sg_table clone function to sg_split that already exist within the kernel. Franklin S Cooper Jr (4): spi: omap2-mcspi: Add comments for RX only DMA buffer workaround spi: spi-omap2-mcspi: Select SPI_SPLIT spi: omap2-mcspi: Use the SPI framework to handle DMA mapping ARM: dts: am335x-icev2: Add SPI based NOR arch/arm/boot/dts/am335x-icev2.dts | 39 ++++++++++ drivers/spi/Kconfig | 1 + drivers/spi/spi-omap2-mcspi.c | 145 ++++++++++++++++++------------------- 3 files changed, 109 insertions(+), 76 deletions(-) -- 2.7.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
