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authorAxel Lin <axel.lin@ingics.com>2014-02-14 21:06:43 +0800
committerMark Brown <broonie@linaro.org>2014-02-23 12:53:21 +0900
commit9bf46f6df5d1e9db8b4b786d22e88d8b6edd949e (patch)
treea8c87a069b1cd79c713eeb1e3637c6ab62456aed /drivers/spi/spi-xilinx.c
parent38dbfb59d1175ef458d006556061adeaa8751b72 (diff)
downloadlwn-9bf46f6df5d1e9db8b4b786d22e88d8b6edd949e.tar.gz
lwn-9bf46f6df5d1e9db8b4b786d22e88d8b6edd949e.zip
spi: xilinx: Convert to let spi core validate bits_per_word
Set bits_per_word_mask so spi core will reject transfers that attempt to use an unsupported bits_per_word value. spi_bitbang requires custom setup_transfer() to be defined if there is a custom txrx_bufs(). Thus keep the empty xilinx_spi_setup_transfer() function in the code. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi/spi-xilinx.c')
-rw-r--r--drivers/spi/spi-xilinx.c18
1 files changed, 2 insertions, 16 deletions
diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index 6d4ce4615163..4eb1ed9ab6da 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -209,26 +209,11 @@ static void xilinx_spi_chipselect(struct spi_device *spi, int is_on)
}
/* spi_bitbang requires custom setup_transfer() to be defined if there is a
- * custom txrx_bufs(). We have nothing to setup here as the SPI IP block
- * supports 8 or 16 bits per word which cannot be changed in software.
- * SPI clock can't be changed in software either.
- * Check for correct bits per word. Chip select delay calculations could be
- * added here as soon as bitbang_work() can be made aware of the delay value.
+ * custom txrx_bufs().
*/
static int xilinx_spi_setup_transfer(struct spi_device *spi,
struct spi_transfer *t)
{
- struct xilinx_spi *xspi = spi_master_get_devdata(spi->master);
- u8 bits_per_word;
-
- bits_per_word = (t && t->bits_per_word)
- ? t->bits_per_word : spi->bits_per_word;
- if (bits_per_word != xspi->bits_per_word) {
- dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n",
- __func__, bits_per_word);
- return -EINVAL;
- }
-
return 0;
}
@@ -407,6 +392,7 @@ static int xilinx_spi_probe(struct platform_device *pdev)
xspi->write_fn = xspi_write32_be;
}
+ master->bits_per_word_mask = SPI_BPW_MASK(bits_per_word);
xspi->bits_per_word = bits_per_word;
if (xspi->bits_per_word == 8) {
xspi->tx_fn = xspi_tx8;