DART-6UL SPI

DART-6UL- SPI

Testing SPI from user space require some changes.

• Configure your kernel and add spidev driver. Device Drivers -> SPI support -> <*> User mode SPI device driver support
  
• Add spidev and pinctrl to your device tree

&ecspi1 {
	fsl,spi-num-chipselects = <1>;
	cs-gpios = <&gpio4 26 0>;
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_ecspi1_1>;
	status = "okay";

        chip1: spidev@0 {
               compatible = "spidev";
               spi-max-frequency = <12000000>;
               reg = <0>;
        };
/*
        chip2: spidev@1 {
               compatible = "spidev";
               spi-max-frequency = <20000000>;
               reg = <1>;
	};
*/
};

/*
pinctrl_sai1: sai1grp {
        fsl,pins = <
                MX6UL_PAD_CSI_DATA05__SAI1_TX_BCLK      0x11088
                MX6UL_PAD_CSI_DATA04__SAI1_TX_SYNC      0x17088
                MX6UL_PAD_CSI_DATA06__SAI1_RX_DATA      0x11088
                MX6UL_PAD_CSI_DATA07__SAI1_TX_DATA      0x11088
        >;
};
*/

pinctrl_ecspi1_1: ecspi1grp {
	fsl,pins = <
		MX6UL_PAD_CSI_DATA07__ECSPI1_MISO	0x100b1
		MX6UL_PAD_CSI_DATA06__ECSPI1_MOSI	0x100b1
		MX6UL_PAD_CSI_DATA04__ECSPI1_SCLK	0x100b1
		MX6UL_PAD_CSI_DATA05__GPIO4_IO26	0x80000000
	>;
};

Pick and choose the right chip select and you can also have multiple chip selects.

• Compile the Linux kernel and device tree.
• For testing use the application:
  https://raw.githubusercontent.com/varigit/linux-2.6-imx/master/Documentation/spi/spidev_test.c