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

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

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200218105810.902-3-geert+renesas@glider.be
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2020-02-18 11:58:09 +01:00 committed by Mark Brown
parent cd982e6c44
commit c046f8fd83
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 4 additions and 1 deletions
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5
drivers/spi/spi-rspi.c
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@ -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;