> Not a driver but a group of devices (possibly discovered dynamically) > behind a passive gate (like e.g. PCA9517A with EN tied to a connector pin). > It's not much different to a I2C gate or mux with a single child bus > (i2c-mux-gpio that has only a single child). I agree. To prevent the the bus from spikes when connecting / disconnecting something like PCA9517A should be in place. And this one can be considered a 1:1 mux. Just with the exception that Linux cannot control the gate, but can only react to changes to the enable pin. Can't we have a driver for the PCA9517 which gets interrupts when the enable pin changes and then adds / removes the child i2c adapter?
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