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conn/sysfs: redo SPI to be much saner
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- Remove the back pointer from spiConn into SPI. Instead put everything into
  spiConn. This permits the compiler to do smarter optimizations.
- Stop doing memory allocation in String()
- Increase SPI test coverage significantly.
- spi.Pins functions do not take the transaction lock.

Visible side effects are:
- sysfs.SPI doesn't implement sync.Locker anymore.
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@maruel
maruel committed Aug 12, 2018
1 parent 6e2faaa commit 6c72da6
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