> We do support some flags in the upper 16-bits of I2C addresses. Any of > those possibly needed here? I2C_OWN_SLAVE_ADDRESS definately not. ATR is only for addresses on the remote bus while our own address is on the local bus. I2C_TEN_BIT_ADDRESS, only in theory. I have never seen a 10-bit address in the wild, so extremely unlikely that ATR hardware does support it. But then again, there is a slight chance that we add more flags in the future which might be relevant for ATR? So, u32 is probably a good thing to use nonetheless.
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