rkspi_wait_state
int rkspi_wait_state(struct rkspi_softc *, uint32_t, uint32_t);
if (rkspi_wait_state(sc, SPI_SR_TFF, 0))
if (rkspi_wait_state(sc, SPI_SR_RFE, 0))
if (rkspi_wait_state(sc, SPI_SR_BSF, 0))