Spidev support of spi-3wire

Linux Kernel
1

Hello all,

Since I am relatively new to Linux device trees I wanted to get some confirmation of my initial findings. I was wondering if 3wire SPI mode is supported for the Arria V board, Kernel 3.10_ltsi?

I have tried to configure it as shown below and but always get the message “setup: unsupported mode bits 10” during bootup. If that appears correct is there anyway to configure it without spidev perhaps? I have tried “snps,dw-spi-mmio” without luck too. (I am trying to talk to the FMCDAQ2 board via the FMCA connector to configure the ADC/DAC)

    hps_0_spim0: spi@0xfff00000 {
        compatible = "snps,dw-spi-mmio-15.0", "snps,dw-spi-mmio";
        reg = <0xfff00000 0x00000100>;
        interrupt-parent = <&hps_0_arm_gic_0>;
        interrupts = <0 154 4>;
        clocks = <&spi_m_clk>;
        #address-cells = <1>;    /* embeddedsw.dts.params.#address-cells type NUMBER */
        #size-cells = <0>;    /* embeddedsw.dts.params.#size-cells type NUMBER */
        bus-num = <0>;    /* embeddedsw.dts.params.bus-num type NUMBER */
        num-chipselect = <3>;    /* embeddedsw.dts.params.num-chipselect type NUMBER */
        status = "okay";    /* embeddedsw.dts.params.status type STRING */
        spi-3wire;

        CLKD_SPI: CLKD_SPI@0 {
            compatible = "spidev";    /* appended from boardinfo */
            reg = <0>;    /* appended from boardinfo */
            spi-max-frequency = <100000000>;    /* appended from boardinfo */
            enable-dma = <1>;    /* appended from boardinfo */
            spi-3wire;
        }; //end spidev@0 (spidev0)

        DAC_SPI: DAC_SPI@1 {
            compatible = "spidev";    /* appended from boardinfo */
            reg = <1>;    /* appended from boardinfo */
            spi-max-frequency = <100000000>;    /* appended from boardinfo */
            enable-dma = <1>;    /* appended from boardinfo */
            spi-3wire;
        }; //end spidev@0 (spidev0)

        ADC_SPI: ADC_SPI@2 {
            compatible = "spidev";    /* appended from boardinfo */
            reg = <2>;    /* appended from boardinfo */
            spi-max-frequency = <100000000>;    /* appended from boardinfo */
            enable-dma = <1>;    /* appended from boardinfo */
            spi-3wire;
        }; //end spidev@0 (spidev0)

    }; //end spi@0xfff00000 (hps_0_spim0)

Thank you in advance!
-Steve