SPI and uClinux

Ok, reading documentation in Linux kernel I find that if I want to use open() and write() function within my software I need to write a protocol driver or simply use spidev driver. I added in config.c the following code

static struct spi_board_info nios2_spi_devices = {
        .modalias = "spidev",
        .max_speed_hz = 173.3 * 1000,
        .bus_num = 1,
        .chip_select = 0,
        .irq = na_spi_irq,
        .mode = SPI_MODE_0,
};