On Fri, 2018-08-17 at 09:01 +0200, Simon Goldschmidt wrote: > The spi-dw driver currently only supports 8 or 16 bits per word. > > Since the hardware supports 4-16 bits per word, adapt the driver > to also support this. > >
> @@ -307,15 +307,13 @@ static int dw_spi_transfer_one(struct spi_controller > *master, > + > + if ((transfer->bits_per_word < 4) || (transfer->bits_per_word > 16)) > return -EINVAL; > - } You don't need this check as the spi core validates the transfer against master->bits_per_word_mask. > master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP; > - master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); > + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); > master->bus_num = dws->bus_num; >
