Hello Wolfram, On jeudi 20 février 2025 13:09:03 heure normale d’Europe centrale Wolfram Sang wrote: > > as this is a i2c_driver, why isn't it in drivers/i2c/ somewhere? Why > > misc? > > Because drivers/i2c is only for I2C controllers and this is not a > controller. Other address translators also reside in their respective > subsystem, e.g. media for GMSL (de-)serializers. I don't know this chip, > maybe it has no "respective" subsystem and, thus, misc? That is correct, this chip acts both as an I2C address translator and as a GPIO controller with LED control and prefetch capabilities. It's meant to aggregate control signals from multiple SFP cages (or other similar port types), which have both I2C and low-speed signals. Moreover, the chip can be configured to use an SPI master interface instead of an I2C one, although this isn't supported in this driver. Considering all of this, I didn't think that either the I2C subsystem or the GPIO subsystem were a good fit for this component, which is why I chose the misc subsystem. Best Regards, -- Romain Gantois, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
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