add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/Documentation/driver-api/spi.rst
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 a pair of FIFOs connected to dual DMA engines on the other side of the
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 SPI shift register (maximizing throughput). Such drivers bridge between
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 whatever bus they sit on (often the platform bus) and SPI, and expose
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-the SPI side of their device as a :c:type:`struct spi_master
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-<spi_master>`. SPI devices are children of that master,
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+the SPI side of their device as a :c:type:`struct spi_controller
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+<spi_controller>`. SPI devices are children of that master,
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 represented as a :c:type:`struct spi_device <spi_device>` and
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 manufactured from :c:type:`struct spi_board_info
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 <spi_board_info>` descriptors which are usually provided by