spi_set_csgpiod
spi_set_csgpiod(spi, 0, NULL);
spi_set_csgpiod(spi, 0, bs->cs_gpio);
spi_set_csgpiod(spi, idx, ctlr->cs_gpiods[cs]);
spi_set_csgpiod(spi, 0, cs_gpiod);