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That's SPI, not I²C. For SPI I suggested host/device, since the device roles are fixed (unlike I²C), and DU (Data upstream) / DO (Data downstream) instead of MISO/MOSI. Shorter too. I don't think we have settled on this yet though.
I'm sorry, but I can never memorize which direction is upstream and which is downstream. This implies some top / bottom categorization.
for SPI I really like Main and Secondary the most as it keeps the abbreviation the same but also makes sense.
For SPI I really like the "controller / peripheral" terminology and I think it would also be appropriate for I2C.https://twitter.com/hackaday/status/1277624388947456000?s=20 …
Down and Up are very ambiguous (as are head and tail). Initiator and target (like in PCIe) are great.
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