Normally, `cp2615_i2c_transfer.tag` is a random number that identifies a given request-reply pair (the chip sends its response with the same tag it got in the request). Currently, for the sake of ease, my driver sends its requests with a fixed tag of 0xDD for all requests. This defeats the purpose of the tag system. Should I use `get_random_bytes()` instead? My concerns are that generating a random value for each I2C transfer may lead to the entropy pool being used up, especially since - if I understand correctly - `get_random_bytes()` always generates 32 bit random words and discards any extra bytes if `length%4 != 0`, and I only need 1 byte each time.
