SPI Configuration

Configure Kernel Menu for SPI Controller

Under the root directory of freelight-u-sdk, run the following command to enter the kernel menu configuration GUI.
```
make linux-menuconfig
```
Enter the Device Drivers menu.
Enter the SPI support menu.
Figure 1. SPI Support
To enable the SSP controller driver, select the SSP controller option.
Figure 2. SSP Controller
Save your change and exit the kernel configuration dialog.

Board-level Configuration

The following code example is a board-level configuration for the SPI0 controller and its attached slave device.

&spi0 {
        pinctrl-names = "default";
        pinctrl-0 = <&ssp0_pins>;
        status = "enabled";
        spi_dev0: spi@0 {
                compatible = "rohm,dh2228fv";
                pl022,com-mode = <1>;
                spi-max-frequency = <10000000>;
                reg = <0>;
                status = "okay";     
        };
};

For the SPI0 controller:

pinctrl-names, pinctrl-0: Assigns the default pin control configurations using the ssp0_pins setting.
status: Sets the controller to enabled state.

For the SPI slave device under the SPI0 node:

compatible: The compatibility information of the driver.
pl022, com-mode: The communication mode of the driver. The following values are available.
- 0: Polling.
- 1: Interrupt
- 2: DMA
spi_max_frequency: The maximum frequency of the slave device
reg: The register address offset of the slave device.
status: Status of the slave device. The following values are available.
- okay: The slave device is working properly.
- disabled: The slave device has been disabled.

Configure Kernel Menu for SPI Device

Under the root directory of frrlight-u-sdk, run the following command to enter the kernel menu configuration GUI.
```
make linux-menuconfig
```
Enter the Device Drivers menu.
Enter the SPI support menu.
Select the User mode SPI device driver support option.
Save your change and exit the kernel configuration dialog.