AR71XX_SPI_IOC_CS
#define AR71XX_SPI_IOC_CS0 AR71XX_SPI_IOC_CS(0)
#define AR71XX_SPI_IOC_CS1 AR71XX_SPI_IOC_CS(1)
#define AR71XX_SPI_IOC_CS2 AR71XX_SPI_IOC_CS(2)
u32 cs_bit = AR71XX_SPI_IOC_CS(spi_get_chipselect(spi, 0));
AR71XX_SPI_IOC_CS(0) | AR71XX_SPI_IOC_CS(1));
spi_ioc = AR71XX_SPI_IOC_CS(0);
spi_ioc = AR71XX_SPI_IOC_CS(1);
regval |= AR71XX_SPI_IOC_CS(2);