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path: root/drivers/spi/spi_bitbang.c
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Diffstat (limited to 'drivers/spi/spi_bitbang.c')
-rw-r--r--drivers/spi/spi_bitbang.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c
index 88425e1af4d3..0c85c984ccb4 100644
--- a/drivers/spi/spi_bitbang.c
+++ b/drivers/spi/spi_bitbang.c
@@ -187,12 +187,10 @@ int spi_bitbang_setup(struct spi_device *spi)
bitbang = spi_master_get_devdata(spi->master);
- /* REVISIT: some systems will want to support devices using lsb-first
- * bit encodings on the wire. In pure software that would be trivial,
- * just bitbang_txrx_le_cphaX() routines shifting the other way, and
- * some hardware controllers also have this support.
+ /* Bitbangers can support SPI_CS_HIGH, SPI_3WIRE, and so on;
+ * add those to master->flags, and provide the other support.
*/
- if ((spi->mode & SPI_LSB_FIRST) != 0)
+ if ((spi->mode & ~(SPI_CPOL|SPI_CPHA|bitbang->flags)) != 0)
return -EINVAL;
if (!cs) {