My suggestion is to not touch i2c-elektor at all for now, and remove the 'clock' parameter from the first iteration of i2c-icy. It can be added back in case someone complains, which I deem unlikely.
Full ack.
When the PCF8584 is addressed as slave, this register must be loaded with the 7-bit I 2 C-bus address to which the PCF8584 is to respond. During initialization, the own address register S0' must be written to, regardless whether it is later used.
I see. It must be written a non-zero value to leave the monitor mode. But this really needs no callback, we can hardcode any non-zero value. If slave support is (ever) to be implemented, the own address will come from the I2C core.
Okay, so we don't care. Cool, then it's safe to kick the 'clock' parameter from i2c-icy. All 2019 boards (which should be the vast majority in existence) came with a 12 MHz oscillator AFAIK, so the default should be good.
Most drivers don't allow users to change the bus speed, so I think it is safe to remove.
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