spi: allow impls returning early, add flush. #365
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Co-authored-by: Diego Barrios Romero <eldruin@gmail.com>
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Fixes #264
Depends on #351
flushmethod to wait for bus to be idle.The alternative is to document that methods MUST wait for bus idle before returning, but that would be bad for performance IMO. Allowing early return means multiple successive writes can "overlap" so that bytes come out back-to-back without gaps, which is great for workloads with tons of small writes, like SPI displays with
embedded-graphics.Drivers using
SpiDevicewon't have to worry about this, it'll Just Work since Device impls must flush before deasserting CS. Drivers using SpiBus will have to care if they coordinate SPI activity with other GPIO activity.