From: Ben Gamari <bgamari.foss@gmail.com>
To: grant.likely@secretlab.ca, linux-omap@vger.kernel.org
Cc: Ben Gamari <bgamari.foss@gmail.com>
Subject: [PATCH] mcspi: Add support for GPIO chip select lines
Date: Sun, 13 Mar 2011 15:05:19 -0400 [thread overview]
Message-ID: <1300043119-11262-1-git-send-email-bgamari.foss@gmail.com> (raw)
In-Reply-To: <87ipvmx2ok.fsf@gmail.com>
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 provides a table mapping CS line numbers to GPIO numbers in
omap2_mcspi_platform_config.cs_gpios.
Signed-off-by: Ben Gamari <bgamari.foss@gmail.com>
---
arch/arm/plat-omap/include/plat/mcspi.h | 3 ++-
drivers/spi/omap2_mcspi.c | 15 ++++++++++-----
2 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/arch/arm/plat-omap/include/plat/mcspi.h b/arch/arm/plat-omap/include/plat/mcspi.h
index 1254e49..cac1d84 100644
--- a/arch/arm/plat-omap/include/plat/mcspi.h
+++ b/arch/arm/plat-omap/include/plat/mcspi.h
@@ -2,7 +2,8 @@
#define _OMAP2_MCSPI_H
struct omap2_mcspi_platform_config {
- unsigned short num_cs;
+ unsigned short num_cs;
+ int *cs_gpios;
};
struct omap2_mcspi_device_config {
diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
index abb1ffb..59cbed4 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 +236,15 @@ 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);
+ struct omap2_mcspi_platform_config *pconfig = spi->master->dev.platform_data;
+ if (pconfig->cs_gpios) {
+ int gpio = pconfig->cs_gpios[spi->chip_select];
+ gpio_set_value(gpio, 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
next prev parent reply other threads:[~2011-03-13 19:05 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <c0ffcf4415b8edbf55d653a620b92fbbbcd8fed7>
[not found] ` <1297635034-24504-1-git-send-email-bgamari.foss@gmail.com>
[not found] ` <20110302215026.GA22854@angua.secretlab.ca>
[not found] ` <87sjv517yd.fsf@gmail.com>
[not found] ` <f7a269db-3bcf-4bac-8c38-b363e5c7bd0b@email.android.com>
2011-03-13 19:04 ` GPIO chip select support in McSPI Ben Gamari
2011-03-13 19:05 ` Ben Gamari [this message]
2011-03-14 19:27 ` [PATCH] mcspi: Add support for GPIO chip select lines Grant Likely
2011-03-15 2:06 ` Ben Gamari
2011-03-15 2:10 ` Grant Likely
2011-03-14 19:25 ` GPIO chip select support in McSPI Grant Likely
2011-03-15 2:22 ` Ben Gamari
2011-03-15 3:29 ` Grant Likely
2011-08-30 10:14 McSPI questions pertaining to GPIO chip select support Raju Sana
2011-08-30 13:50 ` Ben Gamari
2011-08-30 13:50 ` [PATCH] mcspi: Add support for GPIO chip select lines Ben Gamari
-- strict thread matches above, loose matches on Subject: below --
2010-01-28 4:33 McSPI questions pertaining to GPIO chip select support jassi brar
2010-12-21 17:56 ` [PATCH] mcspi: Add support for GPIO chip select lines Ben Gamari
2010-12-23 19:59 ` Tony Lindgren
2010-12-23 21:38 ` Grant Likely
2010-12-23 23:09 ` Ben Gamari
2010-12-24 0:37 ` Grant Likely
2010-12-24 2:27 ` Ben Gamari
2010-12-24 3:28 ` Grant Likely
2010-12-24 6:05 ` Ben Gamari
2011-02-12 8:33 ` Grant Likely
2011-02-13 22:07 ` Ben Gamari
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