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gpioiic(4), I2C bus over GPIO bit-banging
The gpioiic(4) driver allows to attach I2C busses using GPIO bit-
banging. Ported from OpenBSD.
Please note that a gpioiic(4) driver, once attached to gpio(4) device,
can not be detached because the child device, the iic bus, can not bet
detached (if possible I will change that).
The diff is also available online at http://www.netbsd.org/~mbalmer/diffs/gpioiic_01.diff
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