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path: root/drivers/spi/spi_bitbang_txrx.h
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Diffstat (limited to 'drivers/spi/spi_bitbang_txrx.h')
-rw-r--r--drivers/spi/spi_bitbang_txrx.h16
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/spi/spi_bitbang_txrx.h b/drivers/spi/spi_bitbang_txrx.h
index fc033bbf9180..c16bf853c3eb 100644
--- a/drivers/spi/spi_bitbang_txrx.h
+++ b/drivers/spi/spi_bitbang_txrx.h
@@ -44,7 +44,7 @@
static inline u32
bitbang_txrx_be_cpha0(struct spi_device *spi,
- unsigned nsecs, unsigned cpol,
+ unsigned nsecs, unsigned cpol, unsigned flags,
u32 word, u8 bits)
{
/* if (cpol == 0) this is SPI_MODE_0; else this is SPI_MODE_2 */
@@ -53,7 +53,8 @@ bitbang_txrx_be_cpha0(struct spi_device *spi,
for (word <<= (32 - bits); likely(bits); bits--) {
/* setup MSB (to slave) on trailing edge */
- setmosi(spi, word & (1 << 31));
+ if ((flags & SPI_MASTER_NO_TX) == 0)
+ setmosi(spi, word & (1 << 31));
spidelay(nsecs); /* T(setup) */
setsck(spi, !cpol);
@@ -61,7 +62,8 @@ bitbang_txrx_be_cpha0(struct spi_device *spi,
/* sample MSB (from slave) on leading edge */
word <<= 1;
- word |= getmiso(spi);
+ if ((flags & SPI_MASTER_NO_RX) == 0)
+ word |= getmiso(spi);
setsck(spi, cpol);
}
return word;
@@ -69,7 +71,7 @@ bitbang_txrx_be_cpha0(struct spi_device *spi,
static inline u32
bitbang_txrx_be_cpha1(struct spi_device *spi,
- unsigned nsecs, unsigned cpol,
+ unsigned nsecs, unsigned cpol, unsigned flags,
u32 word, u8 bits)
{
/* if (cpol == 0) this is SPI_MODE_1; else this is SPI_MODE_3 */
@@ -79,7 +81,8 @@ bitbang_txrx_be_cpha1(struct spi_device *spi,
/* setup MSB (to slave) on leading edge */
setsck(spi, !cpol);
- setmosi(spi, word & (1 << 31));
+ if ((flags & SPI_MASTER_NO_TX) == 0)
+ setmosi(spi, word & (1 << 31));
spidelay(nsecs); /* T(setup) */
setsck(spi, cpol);
@@ -87,7 +90,8 @@ bitbang_txrx_be_cpha1(struct spi_device *spi,
/* sample MSB (from slave) on trailing edge */
word <<= 1;
- word |= getmiso(spi);
+ if ((flags & SPI_MASTER_NO_RX) == 0)
+ word |= getmiso(spi);
}
return word;
}