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  • Stephen Warren's avatar
    spi: remove completely broken Tegra driver · 536a53a3
    Stephen Warren authored
    
    
    The current SPI driver has many issues. Examples are:
    
    * Segfaulting on most transfers due to expecting all transfers to have
      both RX and TX buffers.
    * Hanging on TX transfers since the whole driver flow is driven by RX
      DMA completion, but the HW is only told to enable RX for RX transfers.
    * Use of clk_disable_unprepare() from atomic context.
    * Once those and other minor issues are fixed, the driver still doesn't
      actually work.
    * The driver also implements a deprecated API to the SPI core.
    
    For this reason, simply remove the driver completely. This has two
    advantages:
    
    1) This will remove the last use of Tegra's <mach/dma.h>, which will
       allow that file to be removed, which is required for single zImage
       work.
    
    2) The downstream driver is significaly different from the current
       code. I believe a patch to re-add the downstream driver (with
       appropriate cleanup) will be much simpler to review if it's a new
       file rather than randomly interspered with essentially unrelated
       existing code.
    
    Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
    Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
    536a53a3