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spi: orion: add LSB support 

The orion spi driver currently only supports the normal (i.e. MSB) mode.
This patch adds LSB first mode.

Also correct the comment about supported SPI modes that was left over by
b15d5d7004 ("spi/orion: Add SPI_CHPA and SPI_CPOL support to kirkwood
driver.").

Signed-off-by: Bastian Stender <bst@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Bastian Stender 2017-04-07 15:52:33 +02:00 committed by Mark Brown
parent fafd679407
commit 1017f42401
1 changed files with 9 additions and 2 deletions
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11
drivers/spi/spi-orion.c
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@ -39,6 +39,8 @@
#define ORION_SPI_IF_CTRL_REG 0x00
#define ORION_SPI_IF_CONFIG_REG 0x04
#define ORION_SPI_IF_RXLSBF BIT(14)
#define ORION_SPI_IF_TXLSBF BIT(13)
#define ORION_SPI_DATA_OUT_REG 0x08
#define ORION_SPI_DATA_IN_REG 0x0c
#define ORION_SPI_INT_CAUSE_REG 0x10
@ -234,6 +236,11 @@ orion_spi_mode_set(struct spi_device *spi)
reg |= ORION_SPI_MODE_CPOL;
if (spi->mode & SPI_CPHA)
reg |= ORION_SPI_MODE_CPHA;
if (spi->mode & SPI_LSB_FIRST)
reg |= ORION_SPI_IF_RXLSBF | ORION_SPI_IF_TXLSBF;
else
reg &= ~(ORION_SPI_IF_RXLSBF | ORION_SPI_IF_TXLSBF);
writel(reg, spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
}
@ -591,8 +598,8 @@ static int orion_spi_probe(struct platform_device *pdev)
master->bus_num = cell_index;
}
/* we support only mode 0, and no options */
master->mode_bits = SPI_CPHA | SPI_CPOL;
/* we support all 4 SPI modes and LSB first option */
master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LSB_FIRST;
master->set_cs = orion_spi_set_cs;
master->transfer_one = orion_spi_transfer_one;
master->num_chipselect = ORION_NUM_CHIPSELECTS;