Many applications require more chip select lines than the board or processor allow. Introduce a mechanism to allow use of GPIO pins as chip select lines with the McSPI controller. To use this functionality, one simply specifies the GPIO number in spi_board_info.controller_data.
Signed-off-by: Ben Gamari <[email protected]> --- drivers/spi/omap2_mcspi.c | 13 ++++++++----- 1 files changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c index 951a160..ca4a7dc 100644 --- a/drivers/spi/omap2_mcspi.c +++ b/drivers/spi/omap2_mcspi.c @@ -35,6 +35,7 @@ #include <linux/slab.h> #include <linux/spi/spi.h> +#include <linux/gpio.h> #include <plat/dma.h> #include <plat/clock.h> @@ -235,11 +236,13 @@ static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable) static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active) { - u32 l; - - l = mcspi_cached_chconf0(spi); - MOD_REG_BIT(l, OMAP2_MCSPI_CHCONF_FORCE, cs_active); - mcspi_write_chconf0(spi, l); + if (spi->controller_data) { + gpio_set_value((unsigned) spi->controller_data, cs_active); + } else { + u32 l = mcspi_cached_chconf0(spi); + MOD_REG_BIT(l, OMAP2_MCSPI_CHCONF_FORCE, cs_active); + mcspi_write_chconf0(spi, l); + } } static void omap2_mcspi_set_master_mode(struct spi_master *master) -- 1.7.0.4 ------------------------------------------------------------------------------ The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE: Pinpoint memory and threading errors before they happen. Find and fix more than 250 security defects in the development cycle. Locate bottlenecks in serial and parallel code that limit performance. http://p.sf.net/sfu/intel-dev2devfeb _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
