diff options
| author | Qipan Li <Qipan.Li@csr.com> | 2014-04-14 14:29:58 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-04-14 21:02:54 +0100 |
| commit | 625227a4e916fa87f1dd84bde518ef403c3f708a (patch) | |
| tree | 94b3aba95ede7e32f87668490241ed62836b42cf /drivers/spi/spi-sirf.c | |
| parent | 818e91625aa17161cd6b39a4d08b77c984f0f485 (diff) | |
| download | linux-625227a4e916fa87f1dd84bde518ef403c3f708a.tar.bz2 | |
spi: sirf: set SPI controller in RISC IO chipselect mode
SPI bitbang supply "chipselect" interface for change chip-select line
, in the SiRFSoC SPI controller, we need to enable "SPI_CS_IO_MODE",
otherwise, spi_sirfsoc_chipselect() has no effect.
now the driver is working is because SPI controller will control CS
automatically without SPI_CS_IO_MODE. this patch makes the CS controller
really controlled by software.
Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi/spi-sirf.c')
| -rw-r--r-- | drivers/spi/spi-sirf.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c index 51d7c988d3ae..9b30743d816a 100644 --- a/drivers/spi/spi-sirf.c +++ b/drivers/spi/spi-sirf.c @@ -559,6 +559,11 @@ spi_sirfsoc_setup_transfer(struct spi_device *spi, struct spi_transfer *t) regval &= ~SIRFSOC_SPI_CMD_MODE; sspi->tx_by_cmd = false; } + /* + * set spi controller in RISC chipselect mode, we are controlling CS by + * software BITBANG_CS_ACTIVE and BITBANG_CS_INACTIVE. + */ + regval |= SIRFSOC_SPI_CS_IO_MODE; writel(regval, sspi->base + SIRFSOC_SPI_CTRL); if (IS_DMA_VALID(t)) { |