SPI_CLK_CFG
reg = bcm_spi_readb(bs, SPI_CLK_CFG);
bcm_spi_writeb(bs, reg, SPI_CLK_CFG);
[SPI_CLK_CFG] = SPI_6348_CLK_CFG,
[SPI_CLK_CFG] = SPI_6358_CLK_CFG,