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There are tags for i2c and 1-wire, but there's no tag for spi. Why not?
There are something like 200 questions already on the site that could be classified using such a tag. Instead, they have tags like gpio, driver, hardware and peripherals.
Is there any objection to creating such a tag and using it to start tagging questions?
I have created the tag for you since you do not have enough reputation.