STM32H7_SPI_TXDR
.tx = { STM32H7_SPI_TXDR },
.tx = { STM32H7_SPI_TXDR },
writeb_relaxed(++count, spi->base + STM32H7_SPI_TXDR);
writel_relaxed(*tx_buf32, spi->base + STM32H7_SPI_TXDR);
writew_relaxed(*tx_buf16, spi->base + STM32H7_SPI_TXDR);
writeb_relaxed(*tx_buf8, spi->base + STM32H7_SPI_TXDR);