Intel: I am using Platform Designer (formerly Qsys) to connect altera_avalom_i2c (Altera Avalon I2C) to HPS-to-FPGA Bridge. I used the device tree generator to generate a device tree (.dts) from .sopcinfo, but when I checked the description for the corresponding i2c device, it said .compatible = "unknown,unknown-17.1"; and the device driver was not linked.

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Intel: Using Platform Designer (formerly Qsys) to connect altera_avalom_i2c (Altera Avalon I2C) to HPS-to-FPGA Bridge. I used a device tree generator to generate a device tree (.dts) from .sopcinfo, but when I checked the description for the corresponding i2c device, it was .compatible = "unknown,unknown-17.1"; pegging is not performed.

Platform Designer SoC EDS/DS-5 SoC FPGA

Category: SoCs
Tools: Quartus® Prime, SoC EDS
Device: Cyclone® V

In the device tree generated by the device tree generator, compatible is unknown when device driver binding is not possible.
Altera_avalom_i2c (Altera Avalon I2C) is not supported by the driver attached to Linux.
　
Either you can handle it by creating your own driver, or you can route the I/O of the i2c controller on the HPS side to the FPGA side.
The following file seems to correspond to the device driver for the i2c controller on the HPS side.
(linux-socfpga-socfpga-4.9.78-ltsi\drivers\i2c\busses\i2c-designware-* (.compatible = "snps,designware-i2c"))

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