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ADS1114 and ADS1115
Closes #3101.
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This is a generic driver for use with Xilinx AXI I2C controller IP.
Closes #3100.
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Update #2841.
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User API is compatible to Linux userspace API. New test libtests/spi01.
Update #2776.
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This I2C driver framework has some major differences compared to libi2c.
* It is compatible to the Linux I2C user-space API.
* It uses generic IMFS nodes and thus reduces the levels of indirection.
* The drivers don't have to mess around with minor numbers to get their
state information.
* No arbitrary bus controller model is assumed. The main task of an I2C
bus controller driver is to process I2C messages. How this is done is
private to the driver.
* Scatter/gather operations are supported (I2C_M_NOSTART).
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