spi_transfer_add
spi_transfer_add(&sc->sc_spi_transfer, &sc->sc_spi_chunk);
spi_transfer_add(&trans, &chunk);
spi_transfer_add(&trans, &chunk);
spi_transfer_add(&trans, &chunk1);
spi_transfer_add(&trans, &chunk2);
spi_transfer_add(&trans, &ce->chunk);
spi_transfer_add(&trans, &chunk1);
spi_transfer_add(&trans, &chunk2);
void spi_transfer_add(struct spi_transfer *, struct spi_chunk *);