SPI_IO_CONTROL
spi_ioc = readl_relaxed(controller->base + SPI_IO_CONTROL);
writel_relaxed(spi_ioc, controller->base + SPI_IO_CONTROL);
writel_relaxed(SPI_IO_C_NO_TRI_STATE, base + SPI_IO_CONTROL);
control = readl_relaxed(controller->base + SPI_IO_CONTROL);
writel_relaxed(control, controller->base + SPI_IO_CONTROL);