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authorRajeshwari Shinde <rajeshwari.s@samsung.com>2013-05-28 20:10:37 +0000
committerJagannadha Sutradharudu Teki <jaganna@xilinx.com>2013-06-03 00:04:40 +0530
commitbb786b84bdbcfe0474d53a54c82c5695494a6ab5 (patch)
treec329b3cc06a64f9312ac988d48305b89af8056ae /board/timll
parented03f41778c7a11adf81816278c92dfae23d6d77 (diff)
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spi: Add support for preamble bytes
A SPI slave may take time to react to a request. For SPI flash devices this time is defined as one bit time, or a whole byte for 'fast read' mode. If the SPI slave is another CPU, then the time it takes to react may vary. It is convenient to allow the slave device to tag the start of the actual reply so that the host can determine when this 'preamble' finishes and the actual message starts. Add a preamble flag to the available SPI flags. If supported by the driver then it will ignore any received bytes before the preamble on each transaction. This ensures that reliable communication with the slave is possible. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
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