spi_controller_get
ret = spi_register_controller(spi_controller_get(ctlr));
struct spi_controller *host = spi_controller_get(platform_get_drvdata(op));
struct spi_controller *ctlr = spi_controller_get(platform_get_drvdata(pdev));
struct spi_controller *host = spi_controller_get(platform_get_drvdata(pdev));
spi_controller_get(ctlr);
if (!spi_controller_get(ctlr))