Is the linux SPI driver (/drivers/spi/spi-altera.c) suitable for the QSYS soft SPI IP (3 wire serial)? - Is the linux SPI driver (/drivers/spi/spi-altera.c) suitable for the QSYS soft SPI IP (3 wire serial)? Description Yes. The linux SPI driver(/drivers/spi/spi-altera.c) is suitable for the Qsys soft SPI IP(3 wire serial). Resolution You can connect the SPI(3-wire serial) IP to the h2f_lw bridge and create a device tree by referring to the content below: spi_0: spi@0x100020000 { compatible = "altr,spi-15.1", "altr,spi-1.0"; reg = <0x00000001 0x00020000 0x00000020>; interrupt-parent = <&hps_0_arm_gic_0>; interrupts = <0 42 4>; clocks = <&clk_0>; #address-cells = <1>; #size-cells = <0>; bus-num = <0>; num-chipselect = <1>; status = "okay"; spidev0_fpga: spidev@0 { compatible = "rohm,dh2228fv"; /* appended from boardinfo */ reg = <0>; /* appended from boardinfo */ spi-max-frequency = <2500000>; /* appended from boardinfo */ };//end spidev@0 }; //end spi@0x100020000 (spi_0) Custom Fields values: ['novalue'] Troubleshooting 2205760598 False ['SPI (3 Wire Serial) IP'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 15.1 15.1 ['Arria® V FPGAs and SoCs', 'Cyclone® V FPGAs and SoCs', 'Arria® 10 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']