Unverified Commit c046f8fd authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Mark Brown
Browse files

spi: rspi: Add support for LSB-first word order 



All RSPI variants support selecting the word order.
Advertize support for LSB-first order, and act upon the flag being set.

Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200218105810.902-3-geert+renesas@glider.be


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent cd982e6c

drivers/spi/spi-rspi.c

+4 −1
Original line number Diff line number Diff line
@@ -933,6 +933,8 @@ static int rspi_prepare_message(struct spi_controller *ctlr, 
		rspi->spcmd |= SPCMD_CPOL;

	if (spi->mode & SPI_CPHA)

		rspi->spcmd |= SPCMD_CPHA;

	if (spi->mode & SPI_LSB_FIRST)

		rspi->spcmd |= SPCMD_LSBF;



	/* Configure slave signal to assert */

	rspi->spcmd |= SPCMD_SSLA(spi->cs_gpiod ? rspi->ctlr->unused_native_cs
@@ -1255,7 +1257,8 @@ static int rspi_probe(struct platform_device *pdev) 
	ctlr->transfer_one = ops->transfer_one;

	ctlr->prepare_message = rspi_prepare_message;

	ctlr->unprepare_message = rspi_unprepare_message;

	ctlr->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP | ops->extra_mode_bits;

	ctlr->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LSB_FIRST | SPI_LOOP |

			  ops->extra_mode_bits;

	ctlr->flags = ops->flags;

	ctlr->dev.of_node = pdev->dev.of_node;

	ctlr->use_gpio_descriptors = true;