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authorStephen Warren <swarren@nvidia.com>2012-09-28 20:15:48 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-10-01 16:29:49 +0400
commit536a53a300d0d40152796eefb0a9e6e36ca37f7d (patch)
treee644203945ee780d8a1a4cdc656d9b4984f5361d /Documentation/spi
parentf4b81dd83e38277a3d1e6661f0fa8eea8cfe784b (diff)
downloadlinux-536a53a300d0d40152796eefb0a9e6e36ca37f7d.tar.xz
spi: remove completely broken Tegra driver
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: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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