Add DMA support to McSPI driver #13
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This patch adds the initial support for the OMAP Multi-Channel SPI. Some things should be noted however: - DMA xfers are not supported yet. Only PIO is supported as of now. - Multi-Channel controller is not supported yet. Only single-channel controller mode is supported, this means that the controller can xfer messages with one slave at a time. Signed-off-by: Amneesh Singh <a-singh7@ti.com>
This patch adds DMA support to omap_mcspi driver. Notable changes: - Use work-queue based model to perform DMA transfers - Added structures for per-channel tracking of DMA - Added Kconfig option to enable SPI+DMA NOTE: Cache coherency to be managed by application Signed-off-by: Shreyas Shankar <s-shankar@ti.com>
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Cherry-picking McSPI commit from upstream and adding DMA support to it