Messages in this thread Patch in this message | | | Date | Thu, 22 Dec 2005 18:04:49 +0300 | From | Vitaly Wool <> | Subject | [PATCH 2.6-git] SPI: add set_clock() to bitbang |
| |
Hi David,
inlined is the small patch that adds set_clock function to the spi_bitbang structure. Currently SPI bus clock can be configured either in chipselect() (which is _wrong_) or in txrx_buf (also doesn't encourage me much). Making it a separate function adds readability for the code. Also, it seems to be redundant to set clock on each transfer, so it's proposed to do per-message clock setting. If SPI bus clock setting involves some PLL reconfiguration it's definitely gonna save some time.
Vitaly
Signed-off-by: Vitaly Wool <vwool@ru.mvista.com>
drivers/spi/spi_bitbang.c | 3 +++ include/linux/spi/spi_bitbang.h | 1 + 2 files changed, 4 insertions(+)
Index: linux-2.6.orig/drivers/spi/spi_bitbang.c =================================================================== --- linux-2.6.orig.orig/drivers/spi/spi_bitbang.c +++ linux-2.6.orig/drivers/spi/spi_bitbang.c @@ -263,6 +263,9 @@ nsecs = 100; chipselect = 0; status = 0; + if (bitbang->set_clock) + bitbang->set_clock(spi); + for (;;t++) { if (bitbang->shutdown) { status = -ESHUTDOWN; Index: linux-2.6.orig/include/linux/spi/spi_bitbang.h =================================================================== --- linux-2.6.orig.orig/include/linux/spi/spi_bitbang.h +++ linux-2.6.orig/include/linux/spi/spi_bitbang.h @@ -31,6 +31,7 @@ struct spi_bitbang { struct spi_master *master; void (*chipselect)(struct spi_device *spi, int is_on); + void (*set_clock)(struct spi_device *spi); int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t); u32 (*txrx_word[4])(struct spi_device *spi, - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |