dm: spi: Add documentation on how to convert over SPI drivers
This README is intended to help maintainers move their SPI drivers over to driver model. It works through the required steps with an example. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NJagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
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doc/driver-model/spi-howto.txt
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