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https://docs.xilinx.com/v/u/en-US/pg090-axi-iic
https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841974/Linux+I2C+Driver
Kernel Configuration
I2C is not enabled in the current default kernel configuration. The
following steps may be used to enable the driver in the kernel
configuration CONFIG_I2C_XILINX=y
Devicetree
https://github.com/Xilinx/linux-xlnx/blob/master/Documentation/devicetree/bindings/i2c/i2c-xiic.txt
IIC: i2c@81600000
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