[opentitantool] Eeprom primitives in Spi trait

This PR introduces a new method on the spi::Target trait, for doing SPI
transactions following the EEPROM format, that is, consisting of a few
bytes of command/address, followed by a chuck of data to be either read
or written, optionally followed by repeated polling a status bit, to see
if the operation is complete.

A default implementation of the new method is provided for transport
backends which support generic SPI read/write transactions, in effect
moving part of the code from the existing SpiFlash struct into the
spi::Target trait.

Going forward, transports that do not implement generic SPI
transactions, but supports only EEPROM/Flash-style protocol, can provide
their own implementation of the new trait method, and leave the existing
generic Spi transaction method either unimplemented, or severely

Signed-off-by: Jes B. Klinke <jbk@chromium.org>
Change-Id: Ibc33c37e7200eccdea2b2b5a370b4cd924c50bdd
5 files changed
tree: 2ae1ca0df1c78d7705d91b7b76e2e0e64b27c32d
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  5. quality/
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  8. site/
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  10. third_party/
  11. util/
  12. .bazelignore
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  28. check_tool_requirements.core
  29. CLA
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  35. README.md
  36. SUMMARY.md
  37. tool_requirements.py
  38. topgen-reg-only.core
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  41. yum-requirements.txt


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